5.7.4

feat(plugin): expose plugin description
fix(Xapi#installSupplementalPackOnAllHosts): synchronize call_plugin (#532 )
2017-04-24 15:51:01 +02:00 · 2017-04-24 15:37:52 +02:00 · 2017-04-21 16:32:58 +02:00 · 2017-04-12 17:14:10 +02:00 · 2017-04-12 16:33:56 +02:00 · 2017-04-12 13:58:51 +02:00
94 changed files with 11961 additions and 2387 deletions
--- a/.jshintrc
+++ b/.jshintrc
@@ -1,93 +0,0 @@
-{
-  // Julien Fontanet JSHint configuration
-  // https://gist.github.com/julien-f/8095615
-  //
-  // Changes from defaults:
-  // - all enforcing options (except `++` & `--`) enabled
-  // - single quotes
-  // - indentation set to 2 instead of 4
-  // - almost all relaxing options disabled
-  // - environments are set to Node.js
-  //
-  // See http://jshint.com/docs/ for more details
-
-  "maxerr"        : 50,       // {int} Maximum error before stopping
-
-  // Enforcing
-  "bitwise"       : true,     // true: Prohibit bitwise operators (&, |, ^, etc.)
-  "camelcase"     : true,     // true: Identifiers must be in camelCase
-  "curly"         : true,     // true: Require {} for every new block or scope
-  "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
-  "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
-  "freeze"        : true,     // true: Prohibit overwriting prototypes of native objects (Array, Date, ...)
-  "immed"         : true,     // true: Require immediate invocations to be wrapped in parens e.g. `(function () { } ());`
-  "indent"        : 2,        // {int} Number of spaces to use for indentation
-  "latedef"       : true,     // true: Require variables/functions to be defined before being used
-  "newcap"        : true,     // true: Require capitalization of all constructor functions e.g. `new F()`
-  "noarg"         : true,     // true: Prohibit use of `arguments.caller` and `arguments.callee`
-  "noempty"       : true,     // true: Prohibit use of empty blocks
-  "nonbsp"        : true,     // true: Prohibit use of non breakable spaces
-  "nonew"         : true,     // true: Prohibit use of constructors for side-effects (without assignment)
-  "plusplus"      : false,    // true: Prohibit use of `++` & `--`
-  "quotmark"      : "single", // Quotation mark consistency:
-                              //   false    : do nothing (default)
-                              //   true     : ensure whatever is used is consistent
-                              //   "single" : require single quotes
-                              //   "double" : require double quotes
-  "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)
-  "unused"        : true,     // true: Require all defined variables be used
-  "strict"        : false,    // true: Requires all functions run in ES5 Strict Mode
-  "maxcomplexity" : 7,        // {int} Max cyclomatic complexity per function
-  "maxdepth"      : 3,        // {int} Max depth of nested blocks (within functions)
-  "maxlen"        : 80,       // {int} Max number of characters per line
-  "maxparams"     : 4,        // {int} Max number of formal params allowed per function
-  "maxstatements" : 20,       // {int} Max number statements per function
-
-  // Relaxing
-  "asi"           : false,     // true: Tolerate Automatic Semicolon Insertion (no semicolons)
-  "boss"          : false,     // true: Tolerate assignments where comparisons would be expected
-  "debug"         : false,     // true: Allow debugger statements e.g. browser breakpoints.
-  "eqnull"        : false,     // true: Tolerate use of `== null`
-  "esnext"        : true,      // true: Allow ES.next (ES6) syntax (ex: `const`)
-  "evil"          : false,     // true: Tolerate use of `eval` and `new Function()`
-  "expr"          : false,     // true: Tolerate `ExpressionStatement` as Programs
-  "funcscope"     : false,     // true: Tolerate defining variables inside control statements
-  "globalstrict"  : false,     // true: Allow global "use strict" (also enables 'strict')
-  "iterator"      : false,     // true: Tolerate using the `__iterator__` property
-  "lastsemic"     : false,     // true: Tolerate omitting a semicolon for the last statement of a 1-line block
-  "laxbreak"      : false,     // true: Tolerate possibly unsafe line breakings
-  "laxcomma"      : false,     // true: Tolerate comma-first style coding
-  "loopfunc"      : false,     // true: Tolerate functions being defined in loops
-  "moz"           : false,     // true: Allow Mozilla specific syntax (extends and overrides esnext features)
-                               // (ex: `for each`, multiple try/catch, function expression…)
-  "multistr"      : false,     // true: Tolerate multi-line strings
-  "notypeof"      : false,     // true: Tolerate typeof comparison with unknown values.
-  "proto"         : false,     // true: Tolerate using the `__proto__` property
-  "scripturl"     : false,     // true: Tolerate script-targeted URLs
-  "shadow"        : false,     // true: Allows re-define variables later in code e.g. `var x=1; x=2;`
-  "sub"           : false,     // true: Tolerate using `[]` notation when it can still be expressed in dot notation
-  "supernew"      : false,     // true: Tolerate `new function () { ... };` and `new Object;`
-  "validthis"     : false,     // true: Tolerate using this in a non-constructor function
-  "noyield"       : false,     // true: Tolerate generators without yields
-
-  // Environments
-  "browser"       : false,    // Web Browser (window, document, etc)
-  "browserify"    : false,    // Browserify (node.js code in the browser)
-  "couch"         : false,    // CouchDB
-  "devel"         : false,    // Development/debugging (alert, confirm, etc)
-  "dojo"          : false,    // Dojo Toolkit
-  "jquery"        : false,    // jQuery
-  "mocha"         : false,    // mocha
-  "mootools"      : false,    // MooTools
-  "node"          : true,     // Node.js
-  "nonstandard"   : false,    // Widely adopted globals (escape, unescape, etc)
-  "phantom"       : false,    // PhantomJS
-  "prototypejs"   : false,    // Prototype and Scriptaculous
-  "rhino"         : false,    // Rhino
-  "worker"        : false,    // Web Workers
-  "wsh"           : false,    // Windows Scripting Host
-  "yui"           : false,    // Yahoo User Interface
-
-  // Custom Globals
-  "globals"       : {}        // additional predefined global variables
-}
--- a/.mention-bot
+++ b/.mention-bot
@@ -0,0 +1,3 @@
+{
+  "userBlacklist": [ "greenkeeper", "Wescoeur" ]
+}
--- a/.mocha.opts
+++ b/.mocha.opts
@@ -1 +0,0 @@
--require ./better-stacks.js
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-# - 'stable'
-  - '4'
-  - '0.12'
+  - stable
+  - 6
+  - 4

 # Use containers.
 # http://docs.travis-ci.com/user/workers/container-based-infrastructure/
--- a/ISSUE_TEMPLATE.md
+++ b/ISSUE_TEMPLATE.md
@@ -0,0 +1,3 @@
+# ALL ISSUES SHOULD BE CREATED IN XO-WEB'S TRACKER!
+
+https://github.com/vatesfr/xo-web/issues
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ ___

 ## Installation

-Manual install procedure is [available here](https://github.com/vatesfr/xo/blob/master/doc/installation/README.md#installation).
+Manual install procedure is [available here](https://xen-orchestra.com/docs/from_the_sources.html).

 ## Compilation

--- a/better-stacks.js
+++ b/better-stacks.js
@@ -1,13 +1,5 @@
 Error.stackTraceLimit = 100

-// Async stacks.
-//
-// Disabled for now as it cause a huge memory usage with
-// fs.createReadStream().
-// TODO: find a way to reenable.
-//
-// try { require('trace') } catch (_) {}
-
 // Removes internal modules.
 try {
  var sep = require('path').sep
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -58,7 +58,7 @@ gulp.task(function buildCoffee () {
 })

 gulp.task(function buildEs6 () {
-  return src('**/*.js')
+  return src([ '**/*.js', '!*.spec.js' ])
    .pipe(sourceMaps.init())
    .pipe(babel())
    .pipe(sourceMaps.write('.'))
--- a/index.js
+++ b/index.js
@@ -4,7 +4,7 @@

 // Enable xo logs by default.
 if (process.env.DEBUG === undefined) {
-  process.env.DEBUG = 'app-conf,xen-api,xo:*'
+  process.env.DEBUG = 'app-conf,xo:*,-xo:api'
 }

 // Import the real main module.
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "xo-server",
-  "version": "5.1.0",
+  "version": "5.7.4",
  "license": "AGPL-3.0",
  "description": "Server part of Xen-Orchestra",
  "keywords": [
@@ -31,131 +31,146 @@
    "bin": "bin"
  },
  "engines": {
-    "node": ">=0.12"
+    "node": ">=4.5"
  },
  "dependencies": {
-    "@marsaud/smb2": "^0.7.1",
-    "@marsaud/smb2-promise": "^0.2.0",
-    "app-conf": "^0.4.0",
-    "babel-runtime": "^6.5.0",
+    "@marsaud/smb2-promise": "^0.2.1",
+    "@nraynaud/struct-fu": "^1.0.1",
+    "app-conf": "^0.4.1",
+    "archiver": "^1.3.0",
+    "arp-a": "^0.5.1",
+    "babel-runtime": "^6.23.0",
    "base64url": "^2.0.0",
-    "blocked": "^1.1.0",
-    "bluebird": "^3.1.1",
-    "body-parser": "^1.13.3",
+    "bind-property-descriptor": "^0.0.0",
+    "blocked": "^1.2.1",
+    "bluebird": "^3.5.0",
+    "body-parser": "^1.17.1",
    "connect-flash": "^0.1.1",
-    "cookie": "^0.3.0",
-    "cookie-parser": "^1.3.5",
-    "cron": "^1.0.9",
-    "d3-time-format": "^2.0.0",
-    "debug": "^2.1.3",
-    "escape-string-regexp": "^1.0.3",
-    "event-to-promise": "^0.7.0",
+    "cookie": "^0.3.1",
+    "cookie-parser": "^1.4.3",
+    "cron": "^1.2.1",
+    "d3-time-format": "^2.0.5",
+    "debug": "^2.6.3",
+    "decorator-synchronized": "^0.2.3",
+    "escape-string-regexp": "^1.0.5",
+    "event-to-promise": "^0.8.0",
    "exec-promise": "^0.6.1",
-    "execa": "^0.4.0",
-    "express": "^4.13.3",
-    "express-session": "^1.11.3",
-    "fatfs": "^0.10.3",
-    "fs-extra": "^0.30.0",
-    "fs-promise": "^0.4.1",
-    "get-stream": "^2.1.0",
-    "hashy": "~0.4.2",
-    "helmet": "^2.0.0",
-    "highland": "^2.5.1",
-    "http-proxy": "^1.13.2",
-    "http-server-plus": "^0.6.4",
-    "human-format": "^0.6.0",
-    "is-my-json-valid": "^2.12.2",
-    "js-yaml": "^3.2.7",
-    "json-rpc-peer": "^0.11.0",
-    "json5": "^0.4.0",
+    "execa": "^0.6.3",
+    "express": "^4.15.2",
+    "express-session": "^1.15.1",
+    "fatfs": "^0.10.4",
+    "from2": "^2.3.0",
+    "fs-extra": "^2.1.2",
+    "fs-promise": "^2.0.1",
+    "golike-defer": "^0.0.0",
+    "hashy": "~0.6.1",
+    "helmet": "^3.5.0",
+    "highland": "^2.10.5",
+    "http-proxy": "^1.16.2",
+    "http-server-plus": "^0.8.0",
+    "human-format": "^0.8.0",
+    "is-my-json-valid": "^2.16.0",
+    "is-redirect": "^1.0.0",
+    "js-yaml": "^3.8.2",
+    "json-rpc-peer": "^0.13.1",
+    "json5": "^0.5.1",
    "julien-f-source-map-support": "0.0.0",
    "julien-f-unzip": "^0.2.1",
    "kindof": "^2.0.0",
-    "level": "^1.3.0",
+    "level": "^1.6.0",
    "level-party": "^3.0.4",
-    "level-sublevel": "^6.5.2",
-    "leveldown": "^1.4.2",
-    "lodash": "^4.13.1",
+    "level-sublevel": "^6.6.1",
+    "leveldown": "^1.6.0",
+    "lodash": "^4.17.4",
    "make-error": "^1",
-    "micromatch": "^2.3.2",
+    "micromatch": "^2.3.11",
    "minimist": "^1.2.0",
-    "moment-timezone": "^0.5.4",
-    "ms": "^0.7.1",
-    "multikey-hash": "^1.0.1",
-    "ndjson": "^1.4.3",
+    "moment-timezone": "^0.5.11",
+    "ms": "^1.0.0",
+    "multikey-hash": "^1.0.4",
+    "ndjson": "^1.5.0",
+    "parse-pairs": "^0.2.2",
    "partial-stream": "0.0.0",
-    "passport": "^0.3.0",
+    "passport": "^0.3.2",
    "passport-local": "^1.0.0",
-    "promise-toolbox": "^0.3.2",
+    "pretty-format": "^19.0.0",
+    "promise-toolbox": "^0.8.2",
    "proxy-agent": "^2.0.0",
-    "pug": "^2.0.0-alpha6",
-    "redis": "^2.0.1",
-    "schema-inspector": "^1.5.1",
-    "semver": "^5.1.0",
-    "serve-static": "^1.9.2",
-    "stack-chain": "^1.3.3",
-    "struct-fu": "^1.0.0",
-    "through2": "^2.0.0",
-    "trace": "^2.0.1",
-    "ws": "^1.1.1",
-    "xen-api": "^0.9.0",
-    "xml2js": "~0.4.6",
-    "xo-acl-resolver": "^0.2.1",
-    "xo-collection": "^0.4.0",
-    "xo-remote-parser": "^0.3"
+    "pug": "^2.0.0-beta11",
+    "redis": "^2.7.1",
+    "schema-inspector": "^1.6.8",
+    "semver": "^5.3.0",
+    "serve-static": "^1.12.1",
+    "split-lines": "^1.1.0",
+    "stack-chain": "^1.3.7",
+    "tar-stream": "^1.5.2",
+    "through2": "^2.0.3",
+    "tmp": "^0.0.31",
+    "uuid": "^3.0.1",
+    "ws": "^2.2.2",
+    "xen-api": "^0.10.0-2",
+    "xml2js": "~0.4.17",
+    "xo-acl-resolver": "^0.2.3",
+    "xo-collection": "^0.4.1",
+    "xo-common": "^0.1.1",
+    "xo-remote-parser": "^0.3",
+    "xo-vmdk-to-vhd": "0.0.12"
  },
  "devDependencies": {
-    "babel-eslint": "^6.0.4",
+    "babel-eslint": "^7.2.1",
+    "babel-plugin-lodash": "^3.2.11",
    "babel-plugin-transform-decorators-legacy": "^1.3.4",
-    "babel-plugin-transform-runtime": "^6.5.2",
-    "babel-preset-es2015": "^6.5.0",
-    "babel-preset-stage-0": "^6.5.0",
-    "chai": "^3.0.0",
-    "dependency-check": "^2.4.0",
-    "ghooks": "^1.0.3",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-env": "^1.2.2",
+    "babel-preset-stage-0": "^6.22.0",
+    "dependency-check": "^2.8.0",
    "gulp": "git://github.com/gulpjs/gulp#4.0",
    "gulp-babel": "^6",
-    "gulp-coffee": "^2.3.1",
-    "gulp-plumber": "^1.0.0",
-    "gulp-sourcemaps": "^1.5.1",
-    "gulp-watch": "^4.2.2",
-    "leche": "^2.1.1",
-    "mocha": "^2.2.1",
-    "must": "^0.13.1",
-    "nyc": "^7.0.0",
-    "rimraf": "^2.5.2",
-    "sinon": "^1.14.1",
-    "standard": "^7.0.0"
+    "gulp-coffee": "^2.3.4",
+    "gulp-plumber": "^1.1.0",
+    "gulp-sourcemaps": "^2.4.1",
+    "gulp-watch": "^4.3.11",
+    "husky": "^0.13.2",
+    "index-modules": "^0.3.0",
+    "jest": "^19.0.2",
+    "rimraf": "^2.6.1",
+    "standard": "^9.0.2"
  },
  "scripts": {
-    "build": "npm run build-indexes && gulp build --production",
-    "depcheck": "dependency-check ./package.json",
-    "build-indexes": "./tools/generate-index src/api src/xapi/mixins src/xo-mixins",
-    "dev": "npm run build-indexes && gulp build",
-    "dev-test": "mocha --opts .mocha.opts --watch --reporter=min \"dist/**/*.spec.js\"",
-    "lint": "standard",
-    "postrelease": "git checkout master && git merge --ff-only stable && git checkout next-release && git merge --ff-only stable",
-    "posttest": "npm run lint && npm run depcheck",
+    "build": "gulp build --production",
+    "commitmsg": "npm test",
+    "dev": "gulp build",
+    "dev-test": "jest --bail --watch",
+    "posttest": "standard && dependency-check -i constant-stream ./package.json",
+    "prebuild": "index-modules src/api src/xapi/mixins src/xo-mixins",
+    "predev": "npm run prebuild",
    "prepublish": "npm run build",
-    "prerelease": "git checkout next-release && git pull --ff-only && git checkout stable && git pull --ff-only && git merge next-release",
-    "release": "npm version",
    "start": "node bin/xo-server",
-    "test": "nyc mocha --opts .mocha.opts \"dist/**/*.spec.js\""
+    "test": "jest"
  },
  "babel": {
    "plugins": [
+      "lodash",
      "transform-decorators-legacy",
      "transform-runtime"
    ],
    "presets": [
-      "stage-0",
-      "es2015"
+      [
+        "env",
+        {
+          "targets": {
+            "node": 4
+          }
+        }
+      ],
+      "stage-0"
    ]
  },
-  "config": {
-    "ghooks": {
-      "commit-msg": "npm test"
-    }
+  "jest": {
+    "roots": [
+      "<rootDir>/src"
+    ],
+    "testRegex": "\\.spec\\.js$"
  },
  "standard": {
    "ignore": [
--- a/sample.config.yaml
+++ b/sample.config.yaml
@@ -1,11 +1,17 @@
-# Example XO-Server configuration.
+# BE *VERY* CAREFUL WHEN EDITING!
+# YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
+# visit http://www.yamllint.com/ to validate this file as needed

+#=====================================================================
+
+# Example XO-Server configuration.
+#
 # This file is automatically looking for at the following places:
 # - `$HOME/.config/xo-server/config.yaml`
 # - `/etc/xo-server/config.yaml`
 #
 # The first entries have priority.
-
+#
 # Note: paths are relative to the configuration file.

 #=====================================================================
@@ -43,16 +49,17 @@ http:

  # Hosts & ports on which to listen.
  #
-  # By default, the server listens on 0.0.0.0:80.
+  # By default, the server listens on [::]:80.
  listen:
    # Basic HTTP.
    -
      # Address on which the server is listening on.
      #
-      # Sets it to '127.0.0.1' to listen only on the local host.
+      # Sets it to 'localhost' for IP to listen only on the local host.
      #
-      # Default: '0.0.0.0' (all addresses)
-      #hostname: '127.0.0.1'
+      # Default: all IPv6 addresses if available, otherwise all IPv4
+      # addresses.
+      #hostname: 'localhost'

      # Port on which the server is listening on.
      #
@@ -117,10 +124,23 @@ http:

 # Connection to the Redis server.
 redis:
-    # Syntax: redis://[db[:password]@]hostname[:port]
+    # Unix sockets can be used
    #
-    # Default: redis://localhost:6379
-    #uri: ''
+    # Default: undefined
+    #socket: /var/run/redis/redis.sock
+
+    # Syntax: redis://[db[:password]@]hostname[:port][/db-number]
+    #
+    # Default: redis://localhost:6379/0
+    #uri: redis://redis.company.lan/42
+
+    # List of aliased commands.
+    #
+    # See http://redis.io/topics/security#disabling-of-specific-commands
+    #renameCommands:
+    #  del: '3dda29ad-3015-44f9-b13b-fa570de92489'
+    #  srem: '3fd758c9-5610-4e9d-a058-dbf4cb6d8bf0'
+

 # Directory containing the database of XO.
 # Currently used for logs.
--- a/signin.pug
+++ b/signin.pug
@@ -6,55 +6,45 @@ html
    meta(name = 'viewport' content = 'width=device-width, initial-scale=1.0')
    title Xen Orchestra
    meta(name = 'author' content = 'Vates SAS')
-    link(rel = 'stylesheet' href = 'styles/main.css')
-    link(rel = 'stylesheet' href = 'v4/styles/main.css')
-  body
-    .container
-      .row-login
-        .page-header
-          img(src = 'images/logo_small.png')
-          h2 Xen Orchestra
-          form.form-horizontal(action = 'signin/local' method = 'post')
-            fieldset
-              legend.login
-                h3 Sign in
-              if error
-                p.text-danger #{error}
-              .form-group
-                .col-sm-12
-                  .input-group
-                    span.input-group-addon
-                      i.xo-icon-user.fa-fw
-                    input.form-control.input-sm(
-                      name = 'username'
-                      type = 'text'
-                      placeholder = 'Username'
-                      required
-                    )
-              .form-group
-                .col-sm-12
-                  .input-group
-                    span.input-group-addon
-                      i.fa.fa-key.fa-fw
-                    input.form-control.input-sm(
-                      name = 'password'
-                      type = 'password'
-                      placeholder = 'Password'
-                      required
-                    )
-              .form-group
-                .col-sm-5
-                  .checkbox
-                    label
-                      input(
-                        name = 'remember-me'
-                        type = 'checkbox'
-                      )
-                      | Remember me
-              .form-group
-                .col-sm-12
-                  button.btn.btn-login.btn-block.btn-success
-                    i.fa.fa-sign-in
-                    |  Sign in
-              each label, id in strategies
-                div: a(href = 'signin/' + id) Sign in with #{label}
+    link(rel = 'stylesheet' href = 'index.css')
+  body(style = 'display: flex; height: 100vh;')
+    div(style = 'margin: auto; width: 20em;')
+      div.mb-2(style = 'display: flex;')
+        img(src = 'assets/logo.png' style = 'margin: auto;')
+      h2.text-xs-center.mb-2 Xen Orchestra
+      form(action = 'signin/local' method = 'post')
+        fieldset
+          if error
+            p.text-danger #{error}
+          .input-group.mb-1
+            span.input-group-addon
+              i.xo-icon-user.fa-fw
+            input.form-control(
+              name = 'username'
+              type = 'text'
+              placeholder = 'Username'
+              required
+            )
+          .input-group.mb-1
+            span.input-group-addon
+              i.fa.fa-key.fa-fw
+            input.form-control(
+              name = 'password'
+              type = 'password'
+              placeholder = 'Password'
+              required
+            )
+          .checkbox
+            label
+              input(
+                name = 'remember-me'
+                type = 'checkbox'
+              )
+              | &nbsp;
+              | Remember me
+          div
+            button.btn.btn-block.btn-info
+              i.fa.fa-sign-in
+              |  Sign in
+          each label, id in strategies
+            div: a(href = 'signin/' + id) Sign in with #{label}
--- a/src/api-errors.js
+++ b/src/api-errors.js
@@ -1,70 +0,0 @@
-import {JsonRpcError} from 'json-rpc-peer'
-
-// ===================================================================
-
-// Export standard JSON-RPC errors.
-export { // eslint-disable-line no-duplicate-imports
-  InvalidJson,
-  InvalidParameters,
-  InvalidRequest,
-  JsonRpcError,
-  MethodNotFound
-} from 'json-rpc-peer'
-
-// -------------------------------------------------------------------
-
-export class NotImplemented extends JsonRpcError {
-  constructor () {
-    super('not implemented', 0)
-  }
-}
-
-// -------------------------------------------------------------------
-
-export class NoSuchObject extends JsonRpcError {
-  constructor (id, type) {
-    super('no such object', 1, {id, type})
-  }
-}
-
-// -------------------------------------------------------------------
-
-export class Unauthorized extends JsonRpcError {
-  constructor () {
-    super('not authenticated or not enough permissions', 2)
-  }
-}
-
-// -------------------------------------------------------------------
-
-export class InvalidCredential extends JsonRpcError {
-  constructor () {
-    super('invalid credential', 3)
-  }
-}
-
-// -------------------------------------------------------------------
-
-export class AlreadyAuthenticated extends JsonRpcError {
-  constructor () {
-    super('already authenticated', 4)
-  }
-}
-
-// -------------------------------------------------------------------
-
-export class ForbiddenOperation extends JsonRpcError {
-  constructor (operation, reason) {
-    super(`forbidden operation: ${operation}`, 5, reason)
-  }
-}
-
-// -------------------------------------------------------------------
-
-// To be used with a user-readable message.
-// The message can be destined to be displayed to the front-end user.
-export class GenericError extends JsonRpcError {
-  constructor (message) {
-    super(message, 6)
-  }
-}
--- a/src/api/.index-modules
+++ b/src/api/.index-modules
--- a/src/api/backup.js
+++ b/src/api/backup.js
@@ -0,0 +1,98 @@
+import archiver from 'archiver'
+import { basename } from 'path'
+import { format } from 'json-rpc-peer'
+import { forEach } from 'lodash'
+
+// ===================================================================
+
+export function list ({ remote }) {
+  return this.listVmBackups(remote)
+}
+
+list.permission = 'admin'
+list.params = {
+  remote: { type: 'string' }
+}
+
+// -------------------------------------------------------------------
+
+export function scanDisk ({ remote, disk }) {
+  return this.scanDiskBackup(remote, disk)
+}
+
+scanDisk.permission = 'admin'
+scanDisk.params = {
+  remote: { type: 'string' },
+  disk: { type: 'string' }
+}
+
+// -------------------------------------------------------------------
+
+export function scanFiles ({ remote, disk, partition, path }) {
+  return this.scanFilesInDiskBackup(remote, disk, partition, path)
+}
+
+scanFiles.permission = 'admin'
+scanFiles.params = {
+  remote: { type: 'string' },
+  disk: { type: 'string' },
+  partition: { type: 'string', optional: true },
+  path: { type: 'string' }
+}
+
+// -------------------------------------------------------------------
+
+function handleFetchFiles (req, res, { remote, disk, partition, paths, format: archiveFormat }) {
+  this.fetchFilesInDiskBackup(remote, disk, partition, paths).then(files => {
+    res.setHeader('content-disposition', 'attachment')
+    res.setHeader('content-type', 'application/octet-stream')
+
+    const nFiles = paths.length
+
+    // Send lone file directly
+    if (nFiles === 1) {
+      files[0].pipe(res)
+      return
+    }
+
+    const archive = archiver(archiveFormat)
+    archive.on('error', error => {
+      console.error(error)
+      res.end(format.error(0, error))
+    })
+
+    forEach(files, file => {
+      archive.append(file, { name: basename(file.path) })
+    })
+    archive.finalize()
+
+    archive.pipe(res)
+  }).catch(error => {
+    console.error(error)
+    res.writeHead(500)
+    res.end(format.error(0, error))
+  })
+}
+
+export async function fetchFiles ({ format = 'zip', ...params }) {
+  const fileName = params.paths.length > 1
+    ? `restore_${new Date().toJSON()}.${format}`
+    : basename(params.paths[0])
+
+  return this.registerHttpRequest(handleFetchFiles, { ...params, format }, {
+    suffix: encodeURI(`/${fileName}`)
+  }).then(url => ({ $getFrom: url }))
+}
+
+fetchFiles.permission = 'admin'
+fetchFiles.params = {
+  remote: { type: 'string' },
+  disk: { type: 'string' },
+  format: { type: 'string', optional: true },
+  partition: { type: 'string', optional: true },
+  paths: {
+    type: 'array',
+    items: { type: 'string' },
+    minLength: 1
+  }
+}
--- a/src/api/host.coffee
+++ b/src/api/host.coffee
@@ -5,10 +5,11 @@ $forEach = require 'lodash/forEach'
 endsWith = require 'lodash/endsWith'
 startsWith = require 'lodash/startsWith'
 {coroutine: $coroutine} = require 'bluebird'
+{format} = require 'json-rpc-peer'
 {
  extractProperty,
-  parseXml,
-  promisify
+  mapToArray,
+  parseXml
 } = require '../utils'

 #=====================================================================
@@ -261,6 +262,42 @@ stats.resolve = {

 exports.stats = stats;

+#---------------------------------------------------------------------
+
+handleInstallSupplementalPack = $coroutine (req, res, { hostId }) ->
+  xapi = @getXapi(hostId)
+
+  # Timeout seems to be broken in Node 4.
+  # See https://github.com/nodejs/node/issues/3319
+  req.setTimeout(43200000) # 12 hours
+  req.length = req.headers['content-length']
+
+  try
+    yield xapi.installSupplementalPack(req, { hostId })
+    res.end(format.response(0))
+  catch e
+    res.writeHead(500)
+    res.end(format.error(0, new Error(e.message)))
+
+  return
+
+installSupplementalPack = $coroutine ({host}) ->
+  return {
+    $sendTo: yield @registerHttpRequest(handleInstallSupplementalPack, { hostId: host.id })
+  }
+
+installSupplementalPack.description = 'installs supplemental pack from ISO file'
+
+installSupplementalPack.params = {
+  host: { type: 'string' }
+}
+
+installSupplementalPack.resolve = {
+  host: ['host', 'host', 'admin']
+}
+
+exports.installSupplementalPack = installSupplementalPack;
+
 #=====================================================================

 Object.defineProperty(exports, '__esModule', {
--- a/src/api/ip-pool.js
+++ b/src/api/ip-pool.js
@@ -0,0 +1,44 @@
+import { unauthorized } from 'xo-common/api-errors'
+
+export function create (props) {
+  return this.createIpPool(props)
+}
+
+create.permission = 'admin'
+create.description = 'Creates a new ipPool'
+
+// -------------------------------------------------------------------
+
+function delete_ ({ id }) {
+  return this.deleteIpPool(id)
+}
+export { delete_ as delete }
+
+delete_.permission = 'admin'
+delete_.description = 'Delete an ipPool'
+
+// -------------------------------------------------------------------
+
+export function getAll (params) {
+  const { user } = this
+
+  if (!user) {
+    throw unauthorized()
+  }
+
+  return this.getAllIpPools(user.permission === 'admin'
+    ? params && params.userId
+    : user.id
+  )
+}
+
+getAll.description = 'List all ipPools'
+
+// -------------------------------------------------------------------
+
+export function set ({ id, ...props }) {
+  return this.updateIpPool(id, props)
+}
+
+set.permission = 'admin'
+set.description = 'Allow to modify an existing ipPool'
--- a/src/api/job.js
+++ b/src/api/job.js
@@ -18,7 +18,11 @@ get.params = {
 }

 export async function create ({job}) {
-  return (await this.createJob(this.session.get('user_id'), job)).id
+  if (!job.userId) {
+    job.userId = this.session.get('user_id')
+  }
+
+  return (await this.createJob(job)).id
 }

 create.permission = 'admin'
@@ -27,7 +31,9 @@ create.params = {
  job: {
    type: 'object',
    properties: {
+      userId: {type: 'string', optional: true},
      name: {type: 'string', optional: true},
+      timeout: {type: 'number', optional: true},
      type: {type: 'string'},
      key: {type: 'string'},
      method: {type: 'string'},
@@ -38,14 +44,7 @@ create.params = {
          items: {
            type: 'array',
            items: {
-              type: 'object',
-              properties: {
-                type: {type: 'string'},
-                values: {
-                  type: 'array',
-                  items: {type: 'object'}
-                }
-              }
+              type: 'object'
            }
          }
        },
@@ -67,9 +66,10 @@ set.params = {
    properties: {
      id: {type: 'string'},
      name: {type: 'string', optional: true},
-      type: {type: 'string'},
-      key: {type: 'string'},
-      method: {type: 'string'},
+      timeout: {type: ['number', 'null'], optional: true},
+      type: {type: 'string', optional: true},
+      key: {type: 'string', optional: true},
+      method: {type: 'string', optional: true},
      paramsVector: {
        type: 'object',
        properties: {
@@ -77,14 +77,7 @@ set.params = {
          items: {
            type: 'array',
            items: {
-              type: 'object',
-              properties: {
-                type: {type: 'string'},
-                values: {
-                  type: 'array',
-                  items: {type: 'object'}
-                }
-              }
+              type: 'object'
            }
          }
        },
--- a/src/api/network.js
+++ b/src/api/network.js
@@ -1,3 +1,9 @@
+import { mapToArray } from '../utils'
+
+export function getBondModes () {
+  return ['balance-slb', 'active-backup', 'lacp']
+}
+
 export async function create ({ pool, name, description, pif, mtu = 1500, vlan = 0 }) {
  return this.getXapi(pool).createNetwork({
    name,
@@ -24,6 +30,81 @@ create.permission = 'admin'

 // =================================================================

+export async function createBonded ({ pool, name, description, pifs, mtu = 1500, mac, bondMode }) {
+  return this.getXapi(pool).createBondedNetwork({
+    name,
+    description,
+    pifIds: mapToArray(pifs, pif =>
+      this.getObject(pif, 'PIF')._xapiId
+    ),
+    mtu: +mtu,
+    mac,
+    bondMode
+  })
+}
+
+createBonded.params = {
+  pool: { type: 'string' },
+  name: { type: 'string' },
+  description: { type: 'string', optional: true },
+  pifs: {
+    type: 'array',
+    items: {
+      type: 'string'
+    }
+  },
+  mtu: { type: ['integer', 'string'], optional: true },
+  // RegExp since schema-inspector does not provide a param check based on an enumeration
+  bondMode: { type: 'string', pattern: new RegExp(`^(${getBondModes().join('|')})$`) }
+}
+
+createBonded.resolve = {
+  pool: ['pool', 'pool', 'administrate']
+}
+createBonded.permission = 'admin'
+createBonded.description = 'Create a bonded network. bondMode can be balance-slb, active-backup or lacp'
+
+// ===================================================================
+
+export async function set ({
+  network,
+
+  name_description: nameDescription,
+  name_label: nameLabel,
+  defaultIsLocked,
+  id
+}) {
+  await this.getXapi(network).setNetworkProperties(network._xapiId, {
+    nameDescription,
+    nameLabel,
+    defaultIsLocked
+  })
+}
+
+set.params = {
+  id: {
+    type: 'string'
+  },
+  name_label: {
+    type: 'string',
+    optional: true
+  },
+  name_description: {
+    type: 'string',
+    optional: true
+  },
+  defaultIsLocked: {
+    type: 'boolean',
+    optional: true
+  }
+}
+
+set.resolve = {
+  network: ['id', 'network', 'administrate']
+}
+
+// =================================================================
+
 export async function delete_ ({ network }) {
  return this.getXapi(network).deleteNetwork(network._xapiId)
 }
--- a/src/api/pif.js
+++ b/src/api/pif.js
@@ -1,5 +1,15 @@
 // TODO: too low level, move into host.

+import { IPV4_CONFIG_MODES, IPV6_CONFIG_MODES } from '../xapi'
+
+export function getIpv4ConfigurationModes () {
+  return IPV4_CONFIG_MODES
+}
+
+export function getIpv6ConfigurationModes () {
+  return IPV6_CONFIG_MODES
+}
+
 // ===================================================================
 // Delete

@@ -66,3 +76,18 @@ reconfigureIp.params = {
 reconfigureIp.resolve = {
  pif: ['id', 'PIF', 'administrate']
 }
+
+// ===================================================================
+
+export async function editPif ({ pif, vlan }) {
+  await this.getXapi(pif).editPif(pif._xapiId, { vlan })
+}
+
+editPif.params = {
+  id: { type: 'string' },
+  vlan: { type: ['integer', 'string'] }
+}
+
+editPif.resolve = {
+  pif: ['id', 'PIF', 'administrate']
+}
--- a/src/api/plugin.js
+++ b/src/api/plugin.js
@@ -102,3 +102,24 @@ purgeConfiguration.params = {
 }

 purgeConfiguration.permission = 'admin'
+
+// ---------------------------------------------------------------------
+
+export async function test ({ id, data }) {
+  await this.testPlugin(id, data)
+}
+
+test.description = 'Test a plugin with its current configuration'
+
+test.params = {
+  id: {
+    type: 'string'
+  },
+  data: {
+    optional: true
+  }
+}
+
+test.permission = 'admin'
+
+// ---------------------------------------------------------------------
--- a/src/api/pool.js
+++ b/src/api/pool.js
@@ -1,4 +1,4 @@
-import {GenericError} from '../api-errors'
+import { format } from 'json-rpc-peer'

 // ===================================================================

@@ -35,21 +35,21 @@ set.resolve = {

 // -------------------------------------------------------------------

-export async function setDefaultSr ({pool, sr}) {
-  await this.getXapi(pool).setDefaultSr(sr._xapiId)
+export async function setDefaultSr ({ sr }) {
+  await this.hasPermissions(this.user.id, [ [ sr.$pool, 'administrate' ] ])
+
+  await this.getXapi(sr).setDefaultSr(sr._xapiId)
 }

+setDefaultSr.permission = '' // signed in
+
 setDefaultSr.params = {
-  pool: {
-    type: 'string'
-  },
  sr: {
    type: 'string'
  }
 }

 setDefaultSr.resolve = {
-  pool: ['pool', 'pool', 'administrate'],
  sr: ['sr', 'SR']
 }
 // -------------------------------------------------------------------
@@ -70,6 +70,23 @@ installPatch.params = {
 installPatch.resolve = {
  pool: ['pool', 'pool', 'administrate']
 }
+// -------------------------------------------------------------------
+
+export async function installAllPatches ({ pool }) {
+  await this.getXapi(pool).installAllPoolPatchesOnAllHosts()
+}
+
+installAllPatches.params = {
+  pool: {
+    type: 'string'
+  }
+}
+
+installAllPatches.resolve = {
+  pool: ['pool', 'pool', 'administrate']
+}
+
+installAllPatches.description = 'Install automatically all patches for every hosts of a pool'

 // -------------------------------------------------------------------

@@ -106,12 +123,7 @@ export {uploadPatch as patch}
 // -------------------------------------------------------------------

 export async function mergeInto ({ source, target, force }) {
-  try {
-    await this.mergeXenPools(source._xapiId, target._xapiId, force)
-  } catch (e) {
-    // FIXME: should we expose plain XAPI error messages?
-    throw new GenericError(e.message)
-  }
+  await this.mergeXenPools(source._xapiId, target._xapiId, force)
 }

 mergeInto.params = {
@@ -130,7 +142,7 @@ mergeInto.resolve = {
 export async function getLicenseState ({pool}) {
  return this.getXapi(pool).call(
    'pool.get_license_state',
-    pool._xapiId.$ref,
+    pool._xapiId.$ref
  )
 }

@@ -143,3 +155,38 @@ getLicenseState.params = {
 getLicenseState.resolve = {
  pool: ['pool', 'pool', 'administrate']
 }
+
+// -------------------------------------------------------------------
+
+async function handleInstallSupplementalPack (req, res, { poolId }) {
+  const xapi = this.getXapi(poolId)
+
+  // Timeout seems to be broken in Node 4.
+  // See https://github.com/nodejs/node/issues/3319
+  req.setTimeout(43200000) // 12 hours
+  req.length = req.headers['content-length']
+
+  try {
+    await xapi.installSupplementalPackOnAllHosts(req)
+    res.end(format.response(0))
+  } catch (e) {
+    res.writeHead(500)
+    res.end(format.error(0, new Error(e.message)))
+  }
+}
+
+export async function installSupplementalPack ({ pool }) {
+  return {
+    $sendTo: await this.registerHttpRequest(handleInstallSupplementalPack, { poolId: pool.id })
+  }
+}
+
+installSupplementalPack.description = 'installs supplemental pack from ISO file on all hosts'
+
+installSupplementalPack.params = {
+  pool: { type: 'string' }
+}
+
+installSupplementalPack.resolve = {
+  pool: ['pool', 'pool', 'admin']
+}
--- a/src/api/resource-set.js
+++ b/src/api/resource-set.js
@@ -1,6 +1,6 @@
 import {
-  Unauthorized
-} from '../api-errors'
+  unauthorized
+} from 'xo-common/api-errors'

 // ===================================================================

@@ -51,11 +51,12 @@ delete_.params = {

 // -------------------------------------------------------------------

-export function set ({ id, name, subjects, objects, limits }) {
+export function set ({ id, name, subjects, objects, ipPools, limits }) {
  return this.updateResourceSet(id, {
    limits,
    name,
    objects,
+    ipPools,
    subjects
  })
 }
@@ -84,6 +85,13 @@ set.params = {
    },
    optional: true
  },
+  ipPools: {
+    type: 'array',
+    items: {
+      type: 'string'
+    },
+    optional: true
+  },
  limits: {
    type: 'object',
    optional: true
@@ -109,12 +117,14 @@ get.params = {
 export async function getAll () {
  const { user } = this
  if (!user) {
-    throw new Unauthorized()
+    throw unauthorized()
  }

  return this.getAllResourceSets(user.id)
 }

+getAll.description = 'Get the list of all existing resource set'
+
 // -------------------------------------------------------------------

 export function addObject ({ id, object }) {
@@ -227,3 +237,4 @@ export function recomputeAllLimits () {
 }

 recomputeAllLimits.permission = 'admin'
+recomputeAllLimits.description = 'Recompute manually the current resource set usage'
--- a/src/api/role.js
+++ b/src/api/role.js
@@ -1,3 +1,5 @@
 export async function getAll () {
  return /* await */ this.getRoles()
 }
+
+getAll.description = 'Returns the list of all existing roles'
--- a/src/api/server.js
+++ b/src/api/server.js
@@ -4,13 +4,14 @@ import {
 } from '../utils'

 export async function add ({
+  label,
  host,
  username,
  password,
  readOnly,
  autoConnect = true
 }) {
-  const server = await this.registerXenServer({host, username, password, readOnly})
+  const server = await this.registerXenServer({label, host, username, password, readOnly})

  if (autoConnect) {
    // Connect asynchronously, ignore any errors.
@@ -25,6 +26,10 @@ add.description = 'register a new Xen server'
 add.permission = 'admin'

 add.params = {
+  label: {
+    optional: true,
+    type: 'string'
+  },
  host: {
    type: 'string'
  },
@@ -70,8 +75,8 @@ getAll.permission = 'admin'

 // -------------------------------------------------------------------

-export async function set ({id, host, username, password, readOnly}) {
-  await this.updateXenServer(id, {host, username, password, readOnly})
+export async function set ({id, label, host, username, password, readOnly}) {
+  await this.updateXenServer(id, {label, host, username, password, readOnly})
 }

 set.description = 'changes the properties of a Xen server'
@@ -82,6 +87,10 @@ set.params = {
  id: {
    type: 'string'
  },
+  label: {
+    type: 'string',
+    optional: true
+  },
  host: {
    type: 'string',
    optional: true
--- a/src/api/session.js
+++ b/src/api/session.js
@@ -1,21 +1,18 @@
 import {deprecate} from 'util'

-import {InvalidCredential, AlreadyAuthenticated} from '../api-errors'
+import { getUserPublicProperties } from '../utils'
+import {invalidCredentials} from 'xo-common/api-errors'

 // ===================================================================

 export async function signIn (credentials) {
-  if (this.session.has('user_id')) {
-    throw new AlreadyAuthenticated()
-  }
-
  const user = await this.authenticateUser(credentials)
  if (!user) {
-    throw new InvalidCredential()
+    throw invalidCredentials()
  }
  this.session.set('user_id', user.id)

-  return this.getUserPublicProperties(user)
+  return getUserPublicProperties(user)
 }

 signIn.description = 'sign in'
@@ -55,7 +52,7 @@ export async function getUser () {

  return userId === undefined
    ? null
-    : this.getUserPublicProperties(await this.getUser(userId))
+    : getUserPublicProperties(await this.getUser(userId))
 }

 getUser.description = 'return the currently connected user'
--- a/src/api/sr.js
+++ b/src/api/sr.js
@@ -34,7 +34,7 @@ set.resolve = {

 // -------------------------------------------------------------------

-export async function scan ({SR}) {
+export async function scan ({ SR }) {
  await this.getXapi(SR).call('SR.scan', SR._xapiRef)
 }

@@ -50,7 +50,15 @@ scan.resolve = {

 // TODO: find a way to call this "delete" and not destroy
 export async function destroy ({ sr }) {
-  await this.getXapi(sr).destroySr(sr._xapiId)
+  const xapi = this.getXapi(sr)
+  if (sr.SR_type === 'xosan') {
+    const config = xapi.xo.getData(sr, 'xosan_config')
+    // we simply forget because the hosted disks are been destroyed with the VMs
+    await xapi.forgetSr(sr._xapiId)
+    await Promise.all(config.nodes.map(node => xapi.deleteVm(node.vm.id, true)))
+    return xapi.deleteNetwork(config.network)
+  }
+  await xapi.destroySr(sr._xapiId)
 }

 destroy.params = {
@@ -63,7 +71,7 @@ destroy.resolve = {

 // -------------------------------------------------------------------

-export async function forget ({SR}) {
+export async function forget ({ SR }) {
  await this.getXapi(SR).forgetSr(SR._xapiId)
 }

@@ -77,7 +85,7 @@ forget.resolve = {

 // -------------------------------------------------------------------

-export async function connectAllPbds ({SR}) {
+export async function connectAllPbds ({ SR }) {
  await this.getXapi(SR).connectAllSrPbds(SR._xapiId)
 }

@@ -91,7 +99,7 @@ connectAllPbds.resolve = {

 // -------------------------------------------------------------------

-export async function disconnectAllPbds ({SR}) {
+export async function disconnectAllPbds ({ SR }) {
  await this.getXapi(SR).disconnectAllSrPbds(SR._xapiId)
 }

@@ -121,6 +129,7 @@ export async function createIso ({
    deviceConfig.legacy_mode = 'true'
  } else if (type === 'smb') {
    path = path.replace(/\\/g, '/')
+    deviceConfig.type = 'cifs'
    deviceConfig.username = user
    deviceConfig.cifspassword = password
  }
@@ -136,7 +145,7 @@ export async function createIso ({
    nameDescription,
    'iso', // SR type ISO
    'iso', // SR content type ISO
-    true,
+    type !== 'local',
    {}
  )

@@ -213,6 +222,51 @@ createNfs.resolve = {
  host: ['host', 'host', 'administrate']
 }

+// -------------------------------------------------------------------
+// HBA SR
+
+// This functions creates an HBA SR
+
+export async function createHba ({
+  host,
+  nameLabel,
+  nameDescription,
+  scsiId
+}) {
+  const xapi = this.getXapi(host)
+
+  const deviceConfig = {
+    scsiId
+  }
+
+  const srRef = await xapi.call(
+    'SR.create',
+    host._xapiRef,
+    deviceConfig,
+    '0',
+    nameLabel,
+    nameDescription,
+    'lvmoohba', // SR LVM over HBA
+    'user', // recommended by Citrix
+    true,
+    {}
+  )
+
+  const sr = await xapi.call('SR.get_record', srRef)
+  return sr.uuid
+}
+
+createHba.params = {
+  host: { type: 'string' },
+  nameLabel: { type: 'string' },
+  nameDescription: { type: 'string' },
+  scsiId: { type: 'string' }
+}
+
+createHba.resolve = {
+  host: ['host', 'host', 'administrate']
+}
+
 // -------------------------------------------------------------------
 // Local LVM SR

@@ -312,6 +366,55 @@ probeNfs.resolve = {
  host: ['host', 'host', 'administrate']
 }

+// -------------------------------------------------------------------
+// This function helps to detect all HBA devices on the host
+
+export async function probeHba ({
+  host
+}) {
+  const xapi = this.getXapi(host)
+
+  let xml
+
+  try {
+    await xapi.call(
+      'SR.probe',
+      host._xapiRef,
+      'type',
+      {}
+    )
+
+    throw new Error('the call above should have thrown an error')
+  } catch (error) {
+    if (error.code !== 'SR_BACKEND_FAILURE_107') {
+      throw error
+    }
+
+    xml = parseXml(error.params[2])
+  }
+
+  const hbaDevices = []
+  forEach(ensureArray(xml.Devlist.BlockDevice), hbaDevice => {
+    hbaDevices.push({
+      hba: hbaDevice.hba.trim(),
+      path: hbaDevice.path.trim(),
+      scsciId: hbaDevice.SCSIid.trim(),
+      size: hbaDevice.size.trim(),
+      vendor: hbaDevice.vendor.trim()
+    })
+  })
+
+  return hbaDevices
+}
+
+probeHba.params = {
+  host: { type: 'string' }
+}
+
+probeHba.resolve = {
+  host: ['host', 'host', 'administrate']
+}
+
 // -------------------------------------------------------------------
 // ISCSI SR

@@ -571,7 +674,7 @@ export async function probeIscsiExists ({
  const srs = []
  forEach(ensureArray(xml['SRlist'].SR), sr => {
    // get the UUID of SR connected to this LUN
-    srs.push({uuid: sr.UUID.trim()})
+    srs.push({ uuid: sr.UUID.trim() })
  })

  return srs
@@ -613,7 +716,7 @@ export async function probeNfsExists ({

  forEach(ensureArray(xml['SRlist'].SR), sr => {
    // get the UUID of SR connected to this LUN
-    srs.push({uuid: sr.UUID.trim()})
+    srs.push({ uuid: sr.UUID.trim() })
  })

  return srs
--- a/src/api/system.js
+++ b/src/api/system.js
@@ -0,0 +1,67 @@
+import forEach from 'lodash/forEach'
+import getKeys from 'lodash/keys'
+import moment from 'moment-timezone'
+
+import { noSuchObject } from 'xo-common/api-errors'
+import { version as xoServerVersion } from '../../package.json'
+
+// ===================================================================
+
+export function getMethodsInfo () {
+  const methods = {}
+
+  forEach(this.apiMethods, (method, name) => {
+    methods[name] = {
+      description: method.description,
+      params: method.params || {},
+      permission: method.permission
+    }
+  })
+
+  return methods
+}
+getMethodsInfo.description = 'returns the signatures of all available API methods'
+
+// -------------------------------------------------------------------
+
+export const getServerTimezone = (tz => () => tz)(moment.tz.guess())
+getServerTimezone.description = 'return the timezone server'
+
+// -------------------------------------------------------------------
+
+export const getServerVersion = () => xoServerVersion
+getServerVersion.description = 'return the version of xo-server'
+
+// -------------------------------------------------------------------
+
+export const getVersion = () => '0.1'
+getVersion.description = 'API version (unstable)'
+
+// -------------------------------------------------------------------
+
+export function listMethods () {
+  return getKeys(this.apiMethods)
+}
+listMethods.description = 'returns the name of all available API methods'
+
+// -------------------------------------------------------------------
+
+export function methodSignature ({method: name}) {
+  const method = this.apiMethods[name]
+
+  if (!method) {
+    throw noSuchObject()
+  }
+
+  // Return an array for compatibility with XML-RPC.
+  return [
+    // XML-RPC require the name of the method.
+    {
+      name,
+      description: method.description,
+      params: method.params || {},
+      permission: method.permission
+    }
+  ]
+}
+methodSignature.description = 'returns the signature of an API method'
--- a/src/api/test.js
+++ b/src/api/test.js
@@ -36,9 +36,9 @@ hasPermission.params = {

 export function wait ({duration, returnValue}) {
  return new Promise(resolve => {
-    setTimeout(+duration, () => {
+    setTimeout(() => {
      resolve(returnValue)
-    })
+    }, +duration)
  })
 }

--- a/src/api/user.js
+++ b/src/api/user.js
@@ -1,10 +1,10 @@
-import {InvalidParameters} from '../api-errors'
-import { mapToArray } from '../utils'
+import {invalidParameters} from 'xo-common/api-errors'
+import { getUserPublicProperties, mapToArray } from '../utils'

 // ===================================================================

 export async function create ({email, password, permission}) {
-  return (await this.createUser(email, {password, permission})).id
+  return (await this.createUser({email, password, permission})).id
 }

 create.description = 'creates a new user'
@@ -22,7 +22,7 @@ create.params = {
 // Deletes an existing user.
 async function delete_ ({id}) {
  if (id === this.session.get('user_id')) {
-    throw new InvalidParameters('a user cannot delete itself')
+    throw invalidParameters('a user cannot delete itself')
  }

  await this.deleteUser(id)
@@ -48,7 +48,7 @@ export async function getAll () {
  const users = await this.getAllUsers()

  // Filters out private properties.
-  return mapToArray(users, this.getUserPublicProperties)
+  return mapToArray(users, getUserPublicProperties)
 }

 getAll.description = 'returns all the existing users'
@@ -58,15 +58,21 @@ getAll.permission = 'admin'
 // -------------------------------------------------------------------

 export async function set ({id, email, password, permission, preferences}) {
-  if (permission && id === this.session.get('user_id')) {
-    throw new InvalidParameters('a user cannot change it\'s own permission')
+  const isAdmin = this.user && this.user.permission === 'admin'
+  if (isAdmin) {
+    if (permission && id === this.session.get('user_id')) {
+      throw invalidParameters('a user cannot change its own permission')
+    }
+  } else if (email || password || permission) {
+    throw invalidParameters('this properties can only changed by an administrator')
  }
+
  await this.updateUser(id, {email, password, permission, preferences})
 }

 set.description = 'changes the properties of an existing user'

-set.permission = 'admin'
+set.permission = ''

 set.params = {
  id: { type: 'string' },
--- a/src/api/vdi.coffee
+++ b/src/api/vdi.coffee
@@ -3,9 +3,9 @@
 {coroutine: $coroutine} = require 'bluebird'

 {format} = require 'json-rpc-peer'
-{InvalidParameters} = require '../api-errors'
+{invalidParameters} = require 'xo-common/api-errors'
 {isArray: $isArray, parseSize} = require '../utils'
-{JsonRpcError} = require '../api-errors'
+{JsonRpcError} = require 'json-rpc-peer'

 #=====================================================================

@@ -38,7 +38,7 @@ set = $coroutine (params) ->
    size = parseSize(params.size)

    if size < vdi.size
-      throw new InvalidParameters(
+      throw invalidParameters(
        "cannot set new size (#{size}) below the current size (#{vdi.size})"
      )
    yield xapi.resizeVdi(ref, size)
--- a/src/api/vif.js
+++ b/src/api/vif.js
@@ -1,5 +1,19 @@
+import {
+  diffItems,
+  noop,
+  pCatch
+} from '../utils'
+
+// ===================================================================
+
 // TODO: move into vm and rename to removeInterface
 async function delete_ ({vif}) {
+  this.allocIpAddresses(
+    vif.id,
+    null,
+    vif.allowedIpv4Addresses.concat(vif.allowedIpv6Addresses)
+  )::pCatch(noop)
+
  await this.getXapi(vif).deleteVif(vif._xapiId)
 }
 export {delete_ as delete}
@@ -13,10 +27,11 @@ delete_.resolve = {
 }

 // -------------------------------------------------------------------
+
 // TODO: move into vm and rename to disconnectInterface
 export async function disconnect ({vif}) {
  // TODO: check if VIF is attached before
-  await this.getXapi(vif).call('VIF.unplug_force', vif._xapiRef)
+  await this.getXapi(vif).disconnectVif(vif._xapiId)
 }

 disconnect.params = {
@@ -31,7 +46,7 @@ disconnect.resolve = {
 // TODO: move into vm and rename to connectInterface
 export async function connect ({vif}) {
  // TODO: check if VIF is attached before
-  await this.getXapi(vif).call('VIF.plug', vif._xapiRef)
+  await this.getXapi(vif).connectVif(vif._xapiId)
 }

 connect.params = {
@@ -44,28 +59,83 @@ connect.resolve = {

 // -------------------------------------------------------------------

-export const set = ({ vif, allowedIpv4Addresses, allowedIpv6Addresses }) => (
-  this.getXapi(vif._xapiId).editVif({
+export async function set ({
+  vif,
+  network,
+  mac,
+  allowedIpv4Addresses,
+  allowedIpv6Addresses,
+  attached
+}) {
+  const oldIpAddresses = vif.allowedIpv4Addresses.concat(vif.allowedIpv6Addresses)
+  const newIpAddresses = []
+  {
+    const { push } = newIpAddresses
+    push.apply(newIpAddresses, allowedIpv4Addresses || vif.allowedIpv4Addresses)
+    push.apply(newIpAddresses, allowedIpv6Addresses || vif.allowedIpv6Addresses)
+  }
+
+  if (network || mac) {
+    const xapi = this.getXapi(vif)
+
+    const vm = xapi.getObject(vif.$VM)
+    mac == null && (mac = vif.MAC)
+    network = xapi.getObject((network && network.id) || vif.$network)
+    attached == null && (attached = vif.attached)
+
+    await this.allocIpAddresses(vif.id, null, oldIpAddresses)
+    await xapi.deleteVif(vif._xapiId)
+
+    // create new VIF with new parameters
+    const newVif = await xapi.createVif(vm.$id, network.$id, {
+      mac,
+      currently_attached: attached,
+      ipv4_allowed: newIpAddresses
+    })
+
+    await this.allocIpAddresses(newVif.$id, newIpAddresses)
+
+    return
+  }
+
+  const [ addAddresses, removeAddresses ] = diffItems(
+    newIpAddresses,
+    oldIpAddresses
+  )
+  await this.allocIpAddresses(
+    vif.id,
+    addAddresses,
+    removeAddresses
+  )
+
+  return this.getXapi(vif).editVif(vif._xapiId, {
    ipv4Allowed: allowedIpv4Addresses,
    ipv6Allowed: allowedIpv6Addresses
  })
-)
+}

 set.params = {
+  id: { type: 'string' },
+  network: { type: 'string', optional: true },
+  mac: { type: 'string', optional: true },
  allowedIpv4Addresses: {
    type: 'array',
    items: {
      type: 'string'
-    }
+    },
+    optional: true
  },
  allowedIpv6Addresses: {
    type: 'array',
    items: {
      type: 'string'
-    }
-  }
+    },
+    optional: true
+  },
+  attached: { type: 'boolean', optional: true }
 }

 set.resolve = {
-  vif: ['id', 'VIF', 'operate']
+  vif: ['id', 'VIF', 'operate'],
+  network: ['network', 'network', 'operate']
 }
--- a/src/api/vm.coffee
+++ b/src/api/vm.coffee
@@ -3,23 +3,27 @@ $debug = (require 'debug') 'xo:api:vm'
 $filter = require 'lodash/filter'
 $findIndex = require 'lodash/findIndex'
 $findWhere = require 'lodash/find'
+concat = require 'lodash/concat'
 endsWith = require 'lodash/endsWith'
 escapeStringRegexp = require 'escape-string-regexp'
 eventToPromise = require 'event-to-promise'
+merge = require 'lodash/merge'
 sortBy = require 'lodash/sortBy'
 startsWith = require 'lodash/startsWith'
 {coroutine: $coroutine} = require 'bluebird'
 {format} = require 'json-rpc-peer'

 {
-  GenericError,
-  Unauthorized
-} = require('../api-errors')
+  forbiddenOperation,
+  invalidParameters,
+  unauthorized
+} = require('xo-common/api-errors')
 {
  forEach,
  formatXml: $js2xml,
  isArray: $isArray,
  map,
+  mapFilter,
  mapToArray,
  noop,
  parseSize,
@@ -47,7 +51,7 @@ checkPermissionOnSrs = (vm, permission = 'operate') -> (
  )

  return @hasPermissions(@session.get('user_id'), permissions).then((success) => (
-    throw new Unauthorized() unless success
+    throw unauthorized() unless success
  ))
 )

@@ -60,6 +64,11 @@ extract = (obj, prop) ->

 # TODO: Implement ACLs
 create = $coroutine (params) ->
+  { user } = this
+  resourceSet = extract(params, 'resourceSet')
+  if not resourceSet and user.permission isnt 'admin'
+    throw unauthorized()
+
  template = extract(params, 'template')
  params.template = template._xapiId

@@ -80,7 +89,7 @@ create = $coroutine (params) ->
      vbd.type is 'Disk' and
      (vdi = vbd.$VDI)
    )
-      vdiSizesByDevice[vbd.device] = +vdi.virtual_size
+      vdiSizesByDevice[vbd.userdevice] = +vdi.virtual_size

    return
  )
@@ -94,7 +103,7 @@ create = $coroutine (params) ->
    limits.disk += size

    return $assign({}, vdi, {
-      device: vdi.device ? vdi.position,
+      device: vdi.userdevice ? vdi.device ? vdi.position,
      size,
      SR: sr._xapiId,
      type: vdi.type
@@ -102,10 +111,10 @@ create = $coroutine (params) ->
  )

  existingVdis = extract(params, 'existingDisks')
-  params.existingVdis = existingVdis and map(existingVdis, (vdi, device) =>
+  params.existingVdis = existingVdis and map(existingVdis, (vdi, userdevice) =>
    if vdi.size?
      size = parseSize(vdi.size)
-      vdiSizesByDevice[device] = size
+      vdiSizesByDevice[userdevice] = size

    if vdi.$SR
      sr = @getObject(vdi.$SR)
@@ -128,33 +137,55 @@ create = $coroutine (params) ->
    return {
      mac: vif.mac
      network: network._xapiId
+      ipv4_allowed: vif.allowedIpv4Addresses
+      ipv6_allowed: vif.allowedIpv6Addresses
    }
  )

  installation = extract(params, 'installation')
  params.installRepository = installation && installation.repository

-  resourceSet = extract(params, 'resourceSet')
+  checkLimits = null

-  xapiVm = yield xapi.createVm(template._xapiId, params)
-  vm = xapi.xo.addObject(xapiVm)
-
-  { user } = this
  if resourceSet
    yield this.checkResourceSetConstraints(resourceSet, user.id, objectIds)
-    yield this.allocateLimitsInResourceSet(limits, resourceSet)
-  else unless user.permission is 'admin'
-    throw new Unauthorized()
+    checkLimits = $coroutine (limits2) =>
+      yield this.allocateLimitsInResourceSet(limits, resourceSet)
+      yield this.allocateLimitsInResourceSet(limits2, resourceSet)
+
+  xapiVm = yield xapi.createVm(template._xapiId, params, checkLimits)
+  vm = xapi.xo.addObject(xapiVm)

  if resourceSet
    yield Promise.all([
-      @addAcl(user.id, vm.id, 'admin')
+      if params.share
+        $resourceSet = yield @getResourceSet(resourceSet)
+        Promise.all(map($resourceSet.subjects, (subjectId) => @addAcl(subjectId, vm.id, 'admin')))
+      else
+        @addAcl(user.id, vm.id, 'admin')
+
      xapi.xo.setData(xapiVm.$id, 'resourceSet', resourceSet)
    ])

+  for vifId in vm.VIFs
+    vif = @getObject(vifId, 'VIF')
+    yield this.allocIpAddresses(vifId, concat(vif.allowedIpv4Addresses, vif.allowedIpv6Addresses)).catch(() =>
+      xapi.deleteVif(vif._xapiId)
+    )
+
+  if params.bootAfterCreate
+    pCatch.call(xapi.startVm(vm._xapiId), noop)
+
  return vm.id

 create.params = {
+  affinityHost: { type: 'string', optional: true }
+
+  bootAfterCreate: {
+    type: 'boolean'
+    optional: true
+  }
+
  cloudConfig: {
    type: 'string'
    optional: true
@@ -191,6 +222,12 @@ create.params = {
  # PV Args
  pv_args: { type: 'string', optional: true }

+
+  share: {
+    type: 'boolean',
+    optional: true
+  }
+
  # TODO: add the install repository!
  # VBD.insert/eject
  # Also for the console!
@@ -200,6 +237,7 @@ create.params = {

  # Virtual interfaces to create for the new VM.
  VIFs: {
+    optional: true
    type: 'array'
    items: {
      type: 'object'
@@ -211,6 +249,18 @@ create.params = {
          optional: true # Auto-generated per default.
          type: 'string'
        }
+
+        allowedIpv4Addresses: {
+          optional: true
+          type: 'array'
+          items: { type: 'string' }
+        }
+
+        allowedIpv6Addresses: {
+          optional: true
+          type: 'array'
+          items: { type: 'string' }
+        }
      }
    }
  }
@@ -253,19 +303,43 @@ create.params = {
 }

 create.resolve = {
-  template: ['template', 'VM-template', 'administrate'],
+  template: ['template', 'VM-template', ''],
 }

 exports.create = create

 #---------------------------------------------------------------------

-delete_ = ({vm, delete_disks: deleteDisks}) ->
+delete_ = $coroutine ({vm, delete_disks: deleteDisks = false }) ->
  cpus = vm.CPUs.number
  memory = vm.memory.size

  xapi = @getXapi(vm)

+  @getAllAcls().then((acls) =>
+    Promise.all(mapFilter(acls, (acl) =>
+      if (acl.object == vm.id)
+        return pCatch.call(
+          @removeAcl(acl.subject, acl.object, acl.action),
+          noop
+        )
+    ))
+  )
+
+  # Update IP pools
+  yield Promise.all(map(vm.VIFs, (vifId) =>
+    vif = xapi.getObject(vifId)
+    return pCatch.call(
+      this.allocIpAddresses(
+        vifId,
+        null,
+        concat(vif.ipv4_allowed, vif.ipv6_allowed)
+      ),
+      noop
+    )
+  ))
+
+  # Update resource sets
  resourceSet = xapi.xo.getData(vm._xapiId, 'resourceSet')
  if resourceSet?
    disk = 0
@@ -282,10 +356,16 @@ delete_ = ({vm, delete_disks: deleteDisks}) ->
      return
    )

-    pCatch.call(@releaseLimitsInResourceSet(
-      @computeVmResourcesUsage(vm),
-      resourceSet
-    ), noop)
+    resourceSetUsage = @computeVmResourcesUsage(vm)
+    ipPoolsUsage = yield @computeVmIpPoolsUsage(vm)
+
+    pCatch.call(
+      @releaseLimitsInResourceSet(
+        merge(resourceSetUsage, ipPoolsUsage),
+        resourceSet
+      ),
+      noop
+    )

  return xapi.deleteVm(vm._xapiId, deleteDisks)

@@ -368,7 +448,7 @@ migrate = $coroutine ({
      ])

  unless yield @hasPermissions(@session.get('user_id'), permissions)
-    throw new Unauthorized()
+    throw unauthorized()

  yield @getXapi(vm).migrateVm(vm._xapiId, @getXapi(host), host._xapiId, {
    migrationNetworkId: migrationNetwork?._xapiId
@@ -409,14 +489,18 @@ set = (params) ->
  VM = extract(params, 'VM')
  xapi = @getXapi(VM)

-  return xapi.editVm(VM._xapiId, params, (limits, vm) =>
+  return xapi.editVm(VM._xapiId, params, $coroutine (limits, vm) =>
    resourceSet = xapi.xo.getData(vm, 'resourceSet')

    if (resourceSet)
-      return @allocateLimitsInResourceSet(limits, resourceSet)
+      try
+        return yield @allocateLimitsInResourceSet(limits, resourceSet)
+      catch error
+        # if the resource set no longer exist, behave as if the VM is free
+        throw error unless noSuchObject.is(error)

    if (limits.cpuWeight && this.user.permission != 'admin')
-      throw new Unauthorized()
+      throw unauthorized()
  )

 set.params = {
@@ -458,10 +542,12 @@ set.params = {
  cpuWeight: { type: ['integer', 'null'], optional: true }

  cpuCap: { type: ['integer', 'null'], optional: true }
+
+  affinityHost: { type: ['string', 'null'], optional: true }
 }

 set.resolve = {
-  VM: ['id', ['VM', 'VM-snapshot'], 'administrate']
+  VM: ['id', ['VM', 'VM-snapshot', 'VM-template'], 'administrate']
 }

 exports.set = set
@@ -549,7 +635,7 @@ copy.params = {
 }

 copy.resolve = {
-  vm: [ 'vm', 'VM', 'administrate' ]
+  vm: [ 'vm', ['VM', 'VM-snapshot'], 'administrate' ]
  sr: [ 'sr', 'SR', 'operate' ]
 }

@@ -562,7 +648,7 @@ convertToTemplate = $coroutine ({vm}) ->
  unless yield @hasPermissions(@session.get('user_id'), [
    [ vm.$pool, 'administrate' ]
  ])
-    throw new Unauthorized()
+    throw unauthorized()

  yield @getXapi(vm).call 'VM.set_is_a_template', vm._xapiRef, true

@@ -757,10 +843,10 @@ exports.rollingBackup = rollingBackup
 rollingDrCopy = ({vm, pool, sr, tag, depth}) ->
  unless sr
    unless pool
-      throw new InvalidParameters('either pool or sr param should be specified')
+      throw invalidParameters('either pool or sr param should be specified')

    if vm.$pool is pool.id
-      throw new GenericError('Disaster Recovery attempts to copy on the same pool')
+      throw forbiddenOperation('Disaster Recovery attempts to copy on the same pool')

    sr = @getObject(pool.default_SR, 'SR')

@@ -818,8 +904,7 @@ stop = $coroutine ({vm, force}) ->
    yield xapi.call 'VM.clean_shutdown', vm._xapiRef
  catch error
    if error.code is 'VM_MISSING_PV_DRIVERS' or error.code is 'VM_LACKS_FEATURE_SHUTDOWN'
-      # TODO: Improve reporting: this message is unclear.
-      @throw 'INVALID_PARAMS'
+      throw invalidParameters('clean shutdown requires PV drivers')
    else
      throw error

@@ -854,18 +939,11 @@ exports.suspend = suspend

 #---------------------------------------------------------------------

-resume = $coroutine ({vm, force}) ->
-  # FIXME: WTF this is?
-  if not force
-    force = true
-
-  yield @getXapi(vm).call 'VM.resume', vm._xapiRef, false, force
-
-  return true
+resume = ({vm}) ->
+  return @getXapi(vm).resumeVm(vm._xapiId)

 resume.params = {
  id: { type: 'string' }
-  force: { type: 'boolean', optional: true }
 }

 resume.resolve = {
@@ -875,15 +953,12 @@ exports.resume = resume

 #---------------------------------------------------------------------

-# revert a snapshot to its parent VM
-revert = $coroutine ({snapshot}) ->
-  # Attempts a revert from this snapshot to its parent VM
-  yield @getXapi(snapshot).call 'VM.revert', snapshot._xapiRef
-
-  return true
+revert = ({snapshot, snapshotBefore}) ->
+  return @getXapi(snapshot).revertVm(snapshot._xapiId, snapshotBefore)

 revert.params = {
-  id: { type: 'string' }
+  id: { type: 'string' },
+  snapshotBefore: { type: 'boolean', optional: true }
 }

 revert.resolve = {
@@ -943,30 +1018,33 @@ exports.export = export_;

 #---------------------------------------------------------------------

-handleVmImport = $coroutine (req, res, { xapi, srId }) ->
+handleVmImport = $coroutine (req, res, { data, srId, type, xapi }) ->
  # Timeout seems to be broken in Node 4.
  # See https://github.com/nodejs/node/issues/3319
  req.setTimeout(43200000) # 12 hours

  try
-    vm = yield xapi.importVm(req, { srId })
+    vm = yield xapi.importVm(req, { data, srId, type })
    res.end(format.response(0, vm.$id))
  catch e
    res.writeHead(500)
-    res.end(format.error(0, new GenericError(e.message)))
+    res.end(format.error(0, new Error(e.message)))

  return

 # TODO: "sr_id" can be passed in URL to target a specific SR
-import_ = $coroutine ({host, sr}) ->
+import_ = $coroutine ({ data, host, sr, type }) ->
+  if data and type is 'xva'
+    throw invalidParameters('unsupported field data for the file type xva')
+
  if not sr
    if not host
-      throw new InvalidParameters('you must provide either host or SR')
+      throw invalidParameters('you must provide either host or SR')

    xapi = @getXapi(host)
    sr = xapi.pool.$default_SR
    if not sr
-      throw new InvalidParameters('there is not default SR in this pool')
+      throw invalidParameters('there is not default SR in this pool')

    # FIXME: must have administrate permission on default SR.
  else
@@ -974,13 +1052,45 @@ import_ = $coroutine ({host, sr}) ->

  return {
    $sendTo: yield @registerHttpRequest(handleVmImport, {
+      data,
      srId: sr._xapiId,
+      type,
      xapi
    })
  }

 import_.params = {
+  data: {
+    type: 'object',
+    optional: true,
+    properties: {
+      descriptionLabel: { type: 'string' },
+      disks: {
+        type: 'array',
+        items: {
+          type: 'object',
+          properties: {
+            capacity: { type: 'integer' },
+            descriptionLabel: { type: 'string' },
+            nameLabel: { type: 'string' },
+            path: { type: 'string' },
+            position: { type: 'integer' }
+          }
+        },
+        optional: true
+      },
+      memory: { type: 'integer' },
+      nameLabel: { type: 'string' },
+      nCpus: { type: 'integer' },
+      networks: {
+        type: 'array',
+        items: { type: 'string' },
+        optional: true
+      },
+    }
+  },
  host: { type: 'string', optional: true },
+  type: { type: 'string', optional: true },
  sr: { type: 'string', optional: true }
 }

@@ -1022,21 +1132,47 @@ exports.attachDisk = attachDisk
 #---------------------------------------------------------------------

 # TODO: implement resource sets
-createInterface = $coroutine ({vm, network, position, mtu, mac}) ->
+createInterface = $coroutine ({
+  vm,
+  network,
+  position,
+  mac,
+  allowedIpv4Addresses,
+  allowedIpv6Addresses
+}) ->
  vif = yield @getXapi(vm).createVif(vm._xapiId, network._xapiId, {
    mac,
-    mtu,
-    position
+    position,
+    ipv4_allowed: allowedIpv4Addresses,
+    ipv6_allowed: allowedIpv6Addresses
  })

+  { push } = ipAddresses = []
+  push.apply(ipAddresses, allowedIpv4Addresses) if allowedIpv4Addresses
+  push.apply(ipAddresses, allowedIpv6Addresses) if allowedIpv6Addresses
+  pCatch.call(@allocIpAddresses(vif.$id, allo), noop) if ipAddresses.length
+
  return vif.$id

 createInterface.params = {
  vm: { type: 'string' }
  network: { type: 'string' }
-  position: { type: 'string', optional: true }
-  mtu: { type: 'string', optional: true }
+  position: { type: ['integer', 'string'], optional: true }
  mac: { type: 'string', optional: true }
+  allowedIpv4Addresses: {
+    type: 'array',
+    items: {
+      type: 'string'
+    },
+    optional: true
+  },
+  allowedIpv6Addresses: {
+    type: 'array',
+    items: {
+      type: 'string'
+    },
+    optional: true
+  }
 }

 createInterface.resolve = {
@@ -1115,10 +1251,7 @@ setBootOrder = $coroutine ({vm, order}) ->
    yield xapi.call 'VM.set_HVM_boot_params', vm._xapiRef, order
    return true

-  @throw(
-    'INVALID_PARAMS'
-    'You can only set the boot order on a HVM guest'
-  )
+  throw invalidParameters('You can only set the boot order on a HVM guest')

 setBootOrder.params = {
  vm: { type: 'string' },
--- a/src/api/xo.js
+++ b/src/api/xo.js
@@ -1,5 +1,50 @@
+import { streamToBuffer } from '../utils'
+
+// ===================================================================
+
+export function clean () {
+  return this.clean()
+}
+
+clean.permission = 'admin'
+
+// -------------------------------------------------------------------
+
+export async function exportConfig () {
+  return {
+    $getFrom: await this.registerHttpRequest((req, res) => {
+      res.writeHead(200, 'OK', {
+        'content-disposition': 'attachment'
+      })
+
+      return this.exportConfig()
+    },
+    undefined,
+    { suffix: '/config.json' })
+  }
+}
+
+exportConfig.permission = 'admin'
+
+// -------------------------------------------------------------------
+
 export function getAllObjects () {
  return this.getObjects()
 }

 getAllObjects.permission = ''
+getAllObjects.description = 'Returns all XO objects'
+
+// -------------------------------------------------------------------
+
+export async function importConfig () {
+  return {
+    $sendTo: await this.registerHttpRequest(async (req, res) => {
+      await this.importConfig(JSON.parse(await streamToBuffer(req)))
+
+      res.end('config successfully imported')
+    })
+  }
+}
+
+importConfig.permission = 'admin'
--- a/src/api/xosan.js
+++ b/src/api/xosan.js
@@ -0,0 +1,478 @@
+import arp from 'arp-a'
+import createLogger from 'debug'
+import defer from 'golike-defer'
+import execa from 'execa'
+import fromPairs from 'lodash/fromPairs'
+import fs from 'fs-promise'
+import map from 'lodash/map'
+import splitLines from 'split-lines'
+import {
+  filter,
+  includes
+} from 'lodash'
+
+import {
+  noop,
+  pCatch,
+  pFromCallback,
+  splitFirst
+} from '../utils'
+
+const debug = createLogger('xo:xosan')
+
+const SSH_KEY_FILE = 'id_rsa_xosan'
+const NETWORK_PREFIX = '172.31.100.'
+
+const XOSAN_VM_SYSTEM_DISK_SIZE = 10 * 1024 * 1024 * 1024
+const XOSAN_DATA_DISK_USEAGE_RATIO = 0.99
+const XOSAN_MAX_DISK_SIZE = 2093050 * 1024 * 1024 // a bit under 2To
+
+const CURRENTLY_CREATING_SRS = {}
+
+export async function getVolumeInfo ({ sr }) {
+  const xapi = this.getXapi(sr)
+  const giantIPtoVMDict = {}
+  const data = xapi.xo.getData(sr, 'xosan_config')
+  if (!data || !data.nodes) {
+    return null
+  }
+  const nodes = data.nodes
+  nodes.forEach(conf => {
+    giantIPtoVMDict[conf.vm.ip] = xapi.getObject(conf.vm.id)
+  })
+  const oneHostAndVm = nodes[0]
+  const resultCmd = await remoteSsh(xapi, {
+    host: xapi.getObject(oneHostAndVm.host),
+    address: oneHostAndVm.vm.ip
+  }, 'gluster volume info xosan')
+  const result = resultCmd['stdout']
+
+  /*
+   Volume Name: xosan
+   Type: Disperse
+   Volume ID: 1d4d0e57-8b6b-43f9-9d40-c48be1df7548
+   Status: Started
+   Snapshot Count: 0
+   Number of Bricks: 1 x (2 + 1) = 3
+   Transport-type: tcp
+   Bricks:
+   Brick1: 192.168.0.201:/bricks/brick1/xosan1
+   Brick2: 192.168.0.202:/bricks/brick1/xosan1
+   Brick3: 192.168.0.203:/bricks/brick1/xosan1
+   Options Reconfigured:
+   client.event-threads: 16
+   server.event-threads: 16
+   performance.client-io-threads: on
+   nfs.disable: on
+   performance.readdir-ahead: on
+   transport.address-family: inet
+   features.shard: on
+   features.shard-block-size: 64MB
+   network.remote-dio: enable
+   cluster.eager-lock: enable
+   performance.io-cache: off
+   performance.read-ahead: off
+   performance.quick-read: off
+   performance.stat-prefetch: on
+   performance.strict-write-ordering: off
+   cluster.server-quorum-type: server
+   cluster.quorum-type: auto
+   */
+  const info = fromPairs(
+    splitLines(result.trim()).map(line =>
+      splitFirst(line, ':').map(val => val.trim())
+    )
+  )
+
+  const getNumber = item => +item.substr(5)
+  const brickKeys = filter(Object.keys(info), key => key.match(/^Brick[1-9]/)).sort((i1, i2) => getNumber(i1) - getNumber(i2))
+
+  // expected brickKeys : [ 'Brick1', 'Brick2', 'Brick3' ]
+  info['Bricks'] = brickKeys.map(key => {
+    const ip = info[key].split(':')[0]
+    return { config: info[key], ip: ip, vm: giantIPtoVMDict[ip] }
+  })
+  const entry = await pFromCallback(cb => arp.table(cb))
+  if (entry) {
+    const brick = info['Bricks'].find(element => element.config.split(':')[0] === entry.ip)
+    if (brick) {
+      brick.mac = entry.mac
+    }
+  }
+
+  return info
+}
+
+getVolumeInfo.description = 'info on gluster volume'
+getVolumeInfo.permission = 'admin'
+
+getVolumeInfo.params = {
+  sr: {
+    type: 'string'
+  }
+}
+getVolumeInfo.resolve = {
+  sr: ['sr', 'SR', 'administrate']
+}
+function floor2048 (value) {
+  return 2048 * Math.floor(value / 2048)
+}
+
+async function copyVm (xapi, originalVm, params) {
+  return { vm: await xapi.copyVm(originalVm, params.sr), params }
+}
+
+async function prepareGlusterVm (xapi, vmAndParam, xosanNetwork, increaseDataDisk = true) {
+  let vm = vmAndParam.vm
+  // refresh the object so that sizes are correct
+  const params = vmAndParam.params
+  const ip = params.xenstore_data['vm-data/ip']
+  const sr = xapi.getObject(params.sr.$id)
+  await xapi._waitObjectState(sr.$id, sr => Boolean(sr.$PBDs))
+  const host = sr.$PBDs[0].$host
+  const firstVif = vm.$VIFs[0]
+  if (xosanNetwork.$id !== firstVif.$network.$id) {
+    await xapi.call('VIF.move', firstVif.$ref, xosanNetwork.$ref)
+  }
+  await xapi.editVm(vm, {
+    name_label: params.name_label,
+    name_description: params.name_description
+  })
+  await xapi.call('VM.set_xenstore_data', vm.$ref, params.xenstore_data)
+  if (increaseDataDisk) {
+    const dataDisk = vm.$VBDs.map(vbd => vbd.$VDI).find(vdi => vdi && vdi.name_label === 'xosan_data')
+    const srFreeSpace = sr.physical_size - sr.physical_utilisation
+    // we use a percentage because it looks like the VDI overhead is proportional
+    const newSize = floor2048((srFreeSpace + dataDisk.virtual_size) * XOSAN_DATA_DISK_USEAGE_RATIO)
+    await xapi._resizeVdi(dataDisk, Math.min(newSize, XOSAN_MAX_DISK_SIZE))
+  }
+  await xapi.startVm(vm)
+  debug('waiting for boot of ', ip)
+  // wait until we find the assigned IP in the networks, we are just checking the boot is complete
+  const vmIsUp = vm => Boolean(vm.$guest_metrics && includes(vm.$guest_metrics.networks, ip))
+  vm = await xapi._waitObjectState(vm.$id, vmIsUp)
+  debug('booted ', ip)
+  return { address: ip, host, vm }
+}
+
+async function callPlugin (xapi, host, command, params) {
+  debug('calling plugin', host.address, command)
+  return JSON.parse(await xapi.call('host.call_plugin', host.$ref, 'xosan.py', command, params))
+}
+
+async function remoteSsh (xapi, hostAndAddress, cmd) {
+  const result = await callPlugin(xapi, hostAndAddress.host, 'run_ssh', {
+    destination: 'root@' + hostAndAddress.address,
+    cmd: cmd
+  })
+  if (result.exit !== 0) {
+    throw new Error('ssh error: ' + JSON.stringify(result))
+  }
+  debug(result)
+  return result
+}
+
+async function setPifIp (xapi, pif, address) {
+  await xapi.call('PIF.reconfigure_ip', pif.$ref, 'Static', address, '255.255.255.0', NETWORK_PREFIX + '1', '')
+}
+
+const createNetworkAndInsertHosts = defer.onFailure(async function ($onFailure, xapi, pif, vlan) {
+  let hostIpLastNumber = 1
+  const xosanNetwork = await xapi.createNetwork({
+    name: 'XOSAN network',
+    description: 'XOSAN network',
+    pifId: pif._xapiId,
+    mtu: 9000,
+    vlan: +vlan
+  })
+  $onFailure(() => xapi.deleteNetwork(xosanNetwork)::pCatch(noop))
+  await Promise.all(xosanNetwork.$PIFs.map(pif => setPifIp(xapi, pif, NETWORK_PREFIX + (hostIpLastNumber++))))
+
+  return xosanNetwork
+})
+async function getOrCreateSshKey (xapi) {
+  let sshKey = xapi.xo.getData(xapi.pool, 'xosan_ssh_key')
+
+  if (!sshKey) {
+    const readKeys = async () => {
+      sshKey = {
+        private: await fs.readFile(SSH_KEY_FILE, 'ascii'),
+        public: await fs.readFile(SSH_KEY_FILE + '.pub', 'ascii')
+      }
+      xapi.xo.setData(xapi.pool, 'xosan_ssh_key', sshKey)
+    }
+
+    try {
+      await readKeys()
+    } catch (e) {
+      await execa('ssh-keygen', ['-q', '-f', SSH_KEY_FILE, '-t', 'rsa', '-b', '4096', '-N', ''])
+      await readKeys()
+    }
+  }
+
+  return sshKey
+}
+async function configureGluster (redundancy, ipAndHosts, xapi, firstIpAndHost, glusterType, arbiter = null) {
+  const configByType = {
+    replica_arbiter: {
+      creation: 'replica 3 arbiter 1',
+      extra: []
+    },
+    replica: {
+      creation: 'replica ' + redundancy + ' ',
+      extra: ['gluster volume set xosan cluster.data-self-heal on']
+    },
+    disperse: {
+      creation: 'disperse ' + ipAndHosts.length + ' redundancy ' + redundancy + ' ',
+      extra: []
+    }
+  }
+  let brickVms = arbiter ? ipAndHosts.concat(arbiter) : ipAndHosts
+  for (let i = 1; i < brickVms.length; i++) {
+    await remoteSsh(xapi, firstIpAndHost, 'gluster peer probe ' + brickVms[i].address)
+  }
+  const creation = configByType[glusterType].creation
+  const volumeCreation = 'gluster volume create xosan ' + creation +
+    ' ' + brickVms.map(ipAndHost => (ipAndHost.address + ':/bricks/xosan/xosandir')).join(' ')
+  debug('creating volume: ', volumeCreation)
+  await remoteSsh(xapi, firstIpAndHost, volumeCreation)
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan network.remote-dio enable')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan cluster.eager-lock enable')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.io-cache off')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.read-ahead off')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.quick-read off')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.strict-write-ordering off')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan client.event-threads 8')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan server.event-threads 8')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.io-thread-count 64')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan performance.stat-prefetch on')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan features.shard on')
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume set xosan features.shard-block-size 512MB')
+  for (const confChunk of configByType[glusterType].extra) {
+    await remoteSsh(xapi, firstIpAndHost, confChunk)
+  }
+  await remoteSsh(xapi, firstIpAndHost, 'gluster volume start xosan')
+}
+
+export const createSR = defer.onFailure(async function ($onFailure, { template, pif, vlan, srs, glusterType, redundancy }) {
+  if (!this.requestResource) {
+    throw new Error('requestResource is not a function')
+  }
+
+  if (srs.length < 1) {
+    return // TODO: throw an error
+  }
+
+  let vmIpLastNumber = 101
+  const xapi = this.getXapi(srs[0])
+  if (CURRENTLY_CREATING_SRS[xapi.pool.$id]) {
+    throw new Error('createSR is already running for this pool')
+  }
+
+  CURRENTLY_CREATING_SRS[xapi.pool.$id] = true
+  try {
+    const xosanNetwork = await createNetworkAndInsertHosts(xapi, pif, vlan)
+    $onFailure(() => xapi.deleteNetwork(xosanNetwork)::pCatch(noop))
+    const sshKey = await getOrCreateSshKey(xapi)
+    const srsObjects = map(srs, srId => xapi.getObject(srId))
+
+    const vmParameters = map(srs, srId => {
+      const sr = xapi.getObject(srId)
+      const host = sr.$PBDs[0].$host
+      return {
+        sr,
+        host,
+        name_label: `XOSAN - ${sr.name_label} - ${host.name_label}`,
+        name_description: 'Xosan VM storing data on volume ' + sr.name_label,
+        // the values of the xenstore_data object *have* to be string, don't forget.
+        xenstore_data: {
+          'vm-data/hostname': 'XOSAN' + sr.name_label,
+          'vm-data/sshkey': sshKey.public,
+          'vm-data/ip': NETWORK_PREFIX + (vmIpLastNumber++),
+          'vm-data/mtu': String(xosanNetwork.MTU),
+          'vm-data/vlan': String(vlan)
+        }
+      }
+    })
+    await Promise.all(vmParameters.map(vmParam => callPlugin(xapi, vmParam.host, 'receive_ssh_keys', {
+      private_key: sshKey.private,
+      public_key: sshKey.public,
+      force: 'true'
+    })))
+
+    const firstVM = await xapi.importVm(
+      await this.requestResource('xosan', template.id, template.version),
+      { srId: vmParameters[0].sr.$ref, type: 'xva' }
+    )
+    $onFailure(() => xapi.deleteVm(firstVM, true)::pCatch(noop))
+    await xapi.editVm(firstVM, {
+      autoPoweron: true
+    })
+    const copiedVms = await Promise.all(vmParameters.slice(1).map(param => copyVm(xapi, firstVM, param)))
+    // TODO: Promise.all() is certainly not the right operation to execute all the given promises whether they fulfill or reject.
+    $onFailure(() => Promise.all(copiedVms.map(vm => xapi.deleteVm(vm.vm, true)))::pCatch(noop))
+    const vmsAndParams = [{
+      vm: firstVM,
+      params: vmParameters[0]
+    }].concat(copiedVms)
+    let arbiter = null
+    if (srs.length === 2) {
+      const sr = vmParameters[0].sr
+      const arbiterConfig = {
+        sr: sr,
+        host: vmParameters[0].host,
+        name_label: vmParameters[0].name_label + ' arbiter',
+        name_description: 'Xosan VM storing data on volume ' + sr.name_label,
+        xenstore_data: {
+          'vm-data/hostname': 'XOSAN' + sr.name_label + '_arb',
+          'vm-data/sshkey': sshKey.public,
+          'vm-data/ip': NETWORK_PREFIX + (vmIpLastNumber++),
+          'vm-data/mtu': String(xosanNetwork.MTU),
+          'vm-data/vlan': String(vlan)
+        }
+      }
+      const arbiterVm = await copyVm(xapi, firstVM, arbiterConfig)
+      $onFailure(() => xapi.deleteVm(arbiterVm.vm, true)::pCatch(noop))
+      arbiter = await prepareGlusterVm(xapi, arbiterVm, xosanNetwork, false)
+    }
+    const ipAndHosts = await Promise.all(map(vmsAndParams, vmAndParam => prepareGlusterVm(xapi, vmAndParam, xosanNetwork)))
+    const firstIpAndHost = ipAndHosts[0]
+    await configureGluster(redundancy, ipAndHosts, xapi, firstIpAndHost, glusterType, arbiter)
+    debug('xosan gluster volume started')
+    const config = { server: firstIpAndHost.address + ':/xosan', backupserver: ipAndHosts[1].address }
+    const xosanSr = await xapi.call('SR.create', srsObjects[0].$PBDs[0].$host.$ref, config, 0, 'XOSAN', 'XOSAN', 'xosan', '', true, {})
+    if (arbiter) {
+      ipAndHosts.push(arbiter)
+    }
+    // we just forget because the cleanup actions will be executed before.
+    $onFailure(() => xapi.forgetSr(xosanSr)::pCatch(noop))
+    await xapi.xo.setData(xosanSr, 'xosan_config', {
+      nodes: ipAndHosts.map(param => ({
+        host: param.host.$id,
+        vm: { id: param.vm.$id, ip: param.address }
+      })),
+      network: xosanNetwork.$id
+    })
+  } finally {
+    delete CURRENTLY_CREATING_SRS[xapi.pool.$id]
+  }
+})
+
+createSR.description = 'create gluster VM'
+createSR.permission = 'admin'
+createSR.params = {
+  srs: {
+    type: 'array',
+    items: {
+      type: 'string'
+    }
+  },
+  pif: {
+    type: 'string'
+  },
+  vlan: {
+    type: 'string'
+  },
+  glusterType: {
+    type: 'string'
+  },
+  redundancy: {
+    type: 'number'
+  }
+}
+
+createSR.resolve = {
+  srs: ['sr', 'SR', 'administrate'],
+  pif: ['pif', 'PIF', 'administrate']
+}
+
+export function checkSrIsBusy ({ poolId }) {
+  return !!CURRENTLY_CREATING_SRS[poolId]
+}
+checkSrIsBusy.description = 'checks if there is a xosan SR curently being created on the given pool id'
+checkSrIsBusy.permission = 'admin'
+checkSrIsBusy.params = { poolId: { type: 'string' } }
+
+const POSSIBLE_CONFIGURATIONS = {}
+POSSIBLE_CONFIGURATIONS[2] = [{ layout: 'replica_arbiter', redundancy: 3, capacity: 1 }]
+POSSIBLE_CONFIGURATIONS[3] = [
+  { layout: 'disperse', redundancy: 1, capacity: 2 },
+  { layout: 'replica', redundancy: 3, capacity: 1 }]
+POSSIBLE_CONFIGURATIONS[4] = [{ layout: 'replica', redundancy: 2, capacity: 1 }]
+POSSIBLE_CONFIGURATIONS[5] = [{ layout: 'disperse', redundancy: 1, capacity: 4 }]
+POSSIBLE_CONFIGURATIONS[6] = [
+  { layout: 'disperse', redundancy: 2, capacity: 4 },
+  { layout: 'replica', redundancy: 2, capacity: 3 },
+  { layout: 'replica', redundancy: 3, capacity: 2 }]
+POSSIBLE_CONFIGURATIONS[7] = [{ layout: 'disperse', redundancy: 3, capacity: 4 }]
+POSSIBLE_CONFIGURATIONS[8] = [{ layout: 'replica', redundancy: 2, capacity: 4 }]
+POSSIBLE_CONFIGURATIONS[9] = [
+  { layout: 'disperse', redundancy: 1, capacity: 8 },
+  { layout: 'replica', redundancy: 3, capacity: 3 }]
+POSSIBLE_CONFIGURATIONS[10] = [
+  { layout: 'disperse', redundancy: 2, capacity: 8 },
+  { layout: 'replica', redundancy: 2, capacity: 5 }]
+POSSIBLE_CONFIGURATIONS[11] = [{ layout: 'disperse', redundancy: 3, capacity: 8 }]
+POSSIBLE_CONFIGURATIONS[12] = [
+  { layout: 'disperse', redundancy: 4, capacity: 8 },
+  { layout: 'replica', redundancy: 2, capacity: 6 }]
+POSSIBLE_CONFIGURATIONS[13] = [{ layout: 'disperse', redundancy: 5, capacity: 8 }]
+POSSIBLE_CONFIGURATIONS[14] = [
+  { layout: 'disperse', redundancy: 6, capacity: 8 },
+  { layout: 'replica', redundancy: 2, capacity: 7 }]
+POSSIBLE_CONFIGURATIONS[15] = [
+  { layout: 'disperse', redundancy: 7, capacity: 8 },
+  { layout: 'replica', redundancy: 3, capacity: 5 }]
+POSSIBLE_CONFIGURATIONS[16] = [{ layout: 'replica', redundancy: 2, capacity: 8 }]
+
+export async function computeXosanPossibleOptions ({ lvmSrs }) {
+  const count = lvmSrs.length
+  const configurations = POSSIBLE_CONFIGURATIONS[count]
+  if (!configurations) {
+    return null
+  }
+  if (count > 0) {
+    const xapi = this.getXapi(lvmSrs[0])
+    const srs = map(lvmSrs, srId => xapi.getObject(srId))
+    const srSizes = map(srs, sr => sr.physical_size - sr.physical_utilisation)
+    const minSize = Math.min.apply(null, srSizes)
+    const brickSize = (minSize - XOSAN_VM_SYSTEM_DISK_SIZE) * XOSAN_DATA_DISK_USEAGE_RATIO
+    return configurations.map(conf => ({ ...conf, availableSpace: brickSize * conf.capacity }))
+  }
+}
+
+computeXosanPossibleOptions.params = {
+  lvmSrs: {
+    type: 'array',
+    items: {
+      type: 'string'
+    }
+  }
+}
+
+// ---------------------------------------------------------------------
+
+export async function downloadAndInstallXosanPack ({ id, version, pool }) {
+  if (!this.requestResource) {
+    throw new Error('requestResource is not a function')
+  }
+
+  const xapi = this.getXapi(pool.id)
+  const res = await this.requestResource('xosan', id, version)
+
+  return xapi.installSupplementalPackOnAllHosts(res)
+}
+
+downloadAndInstallXosanPack.description = 'Register a resource via cloud plugin'
+
+downloadAndInstallXosanPack.params = {
+  id: { type: 'string' },
+  version: { type: 'string' },
+  pool: { type: 'string' }
+}
+
+downloadAndInstallXosanPack.resolve = {
+  pool: ['pool', 'pool', 'administrate']
+}
+
+downloadAndInstallXosanPack.permission = 'admin'
--- a/src/collection/redis.js
+++ b/src/collection/redis.js
@@ -3,6 +3,7 @@ import difference from 'lodash/difference'
 import filter from 'lodash/filter'
 import getKey from 'lodash/keys'
 import {createClient as createRedisClient} from 'redis'
+import {v4 as generateUuid} from 'uuid'

 import {
  forEach,
@@ -35,13 +36,13 @@ export default class Redis extends Collection {
    connection,
    indexes = [],
    prefix,
-    uri = 'tcp://localhost:6379'
+    uri
  }) {
    super()

    this.indexes = indexes
    this.prefix = prefix
-    this.redis = promisifyAll.call(connection || createRedisClient(uri))
+    this.redis = promisifyAll(connection || createRedisClient(uri))
  }

  _extract (ids) {
@@ -68,12 +69,12 @@ export default class Redis extends Collection {
    // TODO: remove “replace” which is a temporary measure, implement
    // “set()” instead.

-    const {indexes, prefix, redis, idPrefix = ''} = this
+    const {indexes, prefix, redis} = this

    return Promise.all(mapToArray(models, async model => {
      // Generate a new identifier if necessary.
      if (model.id === undefined) {
-        model.id = idPrefix + String(await redis.incr(prefix + '_id'))
+        model.id = generateUuid()
      }

      const success = await redis.sadd(prefix + '_ids', model.id)
@@ -149,6 +150,10 @@ export default class Redis extends Collection {
  }

  _remove (ids) {
+    if (isEmpty(ids)) {
+      return
+    }
+
    const {prefix, redis} = this

    // TODO: handle indexes.
--- a/src/decorators.js
+++ b/src/decorators.js
@@ -1,65 +1,19 @@
-import bind from 'lodash/bind'
+import { getBoundPropertyDescriptor } from 'bind-property-descriptor'

 import {
  isArray,
-  isPromise,
-  isFunction,
-  noop,
-  pFinally
+  isFunction
 } from './utils'

 // ===================================================================

 const {
  defineProperties,
-  defineProperty,
  getOwnPropertyDescriptor
 } = Object

 // ===================================================================

-// See: https://github.com/jayphelps/core-decorators.js#autobind
-//
-// TODO: make it work for all class methods.
-export const autobind = (target, key, {
-  configurable,
-  enumerable,
-  value: fn,
-  writable
-}) => ({
-  configurable,
-  enumerable,
-
-  get () {
-    if (this === target) {
-      return fn
-    }
-
-    const bound = bind(fn, this)
-
-    defineProperty(this, key, {
-      configurable: true,
-      enumerable: false,
-      value: bound,
-      writable: true
-    })
-
-    return bound
-  },
-  set (newValue) {
-    // Cannot use assignment because it will call the setter on
-    // the prototype.
-    defineProperty(this, key, {
-      configurable: true,
-      enumerable: true,
-      value: newValue,
-      writable: true
-    })
-  }
-})
-
-// -------------------------------------------------------------------
-
 // Debounce decorator for methods.
 //
 // See: https://github.com/wycats/javascript-decorators
@@ -70,7 +24,7 @@ export const debounce = duration => (target, name, descriptor) => {

  // This symbol is used to store the related data directly on the
  // current object.
-  const s = Symbol()
+  const s = Symbol(`debounced ${name} data`)

  function debounced () {
    const data = this[s] || (this[s] = {
@@ -98,119 +52,8 @@ export const debounce = duration => (target, name, descriptor) => {

 // -------------------------------------------------------------------

-const _push = Array.prototype.push
-
-export const deferrable = (target, name, descriptor) => {
-  let fn
-  function newFn () {
-    const deferreds = []
-    const defer = fn => {
-      deferreds.push(fn)
-    }
-    defer.clear = () => {
-      deferreds.length = 0
-    }
-
-    const args = [ defer ]
-    _push.apply(args, arguments)
-
-    let executeDeferreds = () => {
-      let i = deferreds.length
-      while (i) {
-        deferreds[--i]()
-      }
-    }
-
-    try {
-      const result = fn.apply(this, args)
-
-      if (isPromise(result)) {
-        result::pFinally(executeDeferreds)
-
-        // Do not execute the deferreds in the finally block.
-        executeDeferreds = noop
-      }
-
-      return result
-    } finally {
-      executeDeferreds()
-    }
-  }
-
-  if (descriptor) {
-    fn = descriptor.value
-    descriptor.value = newFn
-
-    return descriptor
-  }
-
-  fn = target
-  return newFn
-}
-
-// Deferred functions are only executed on failures.
-//
-// i.e.: defer.clear() is automatically called in case of success.
-deferrable.onFailure = (target, name, descriptor) => {
-  let fn
-  function newFn (defer) {
-    const result = fn.apply(this, arguments)
-
-    return isPromise(result)
-      ? result.then(result => {
-        defer.clear()
-        return result
-      })
-      : (defer.clear(), result)
-  }
-
-  if (descriptor) {
-    fn = descriptor.value
-    descriptor.value = newFn
-  } else {
-    fn = target
-    target = newFn
-  }
-
-  return deferrable(target, name, descriptor)
-}
-
-// Deferred functions are only executed on success.
-//
-// i.e.: defer.clear() is automatically called in case of failure.
-deferrable.onSuccess = (target, name, descriptor) => {
-  let fn
-  function newFn (defer) {
-    try {
-      const result = fn.apply(this, arguments)
-
-      return isPromise(result)
-        ? result.then(null, error => {
-          defer.clear()
-          throw error
-        })
-        : result
-    } catch (error) {
-      defer.clear()
-      throw error
-    }
-  }
-
-  if (descriptor) {
-    fn = descriptor.value
-    descriptor.value = newFn
-  } else {
-    fn = target
-    target = newFn
-  }
-
-  return deferrable(target, name, descriptor)
-}
-
-// -------------------------------------------------------------------
-
 const _ownKeys = (
-  typeof Reflect !== 'undefined' && Reflect.ownKeys ||
+  (typeof Reflect !== 'undefined' && Reflect.ownKeys) ||
  (({
    getOwnPropertyNames: names,
    getOwnPropertySymbols: symbols
@@ -220,22 +63,6 @@ const _ownKeys = (
  )(Object)
 )

-const _bindPropertyDescriptor = (descriptor, thisArg) => {
-  const { get, set, value } = descriptor
-  if (get) {
-    descriptor.get = bind(get, thisArg)
-  }
-  if (set) {
-    descriptor.set = bind(set, thisArg)
-  }
-
-  if (isFunction(value)) {
-    descriptor.value = bind(value, thisArg)
-  }
-
-  return descriptor
-}
-
 const _isIgnoredProperty = name => (
  name[0] === '_' ||
  name === 'constructor'
@@ -284,7 +111,7 @@ export const mixin = MixIns => Class => {
    defineProperties(prototype, descriptors)
  }

-  const Decorator = (...args) => {
+  function Decorator (...args) {
    const instance = new Class(...args)

    for (const MixIn of MixIns) {
@@ -300,8 +127,9 @@ export const mixin = MixIns => Class => {
          throw new Error(`${name}#${prop} is already defined`)
        }

-        descriptors[prop] = _bindPropertyDescriptor(
-          getOwnPropertyDescriptor(prototype, prop),
+        descriptors[prop] = getBoundPropertyDescriptor(
+          prototype,
+          prop,
          mixinInstance
        )
      }
--- a/src/decorators.spec.js
+++ b/src/decorators.spec.js
@@ -1,48 +1,9 @@
-/* eslint-env mocha */
+/* eslint-env jest */

-import expect from 'must'
+import {debounce} from './decorators'

 // ===================================================================

-import {autobind, debounce, deferrable} from './decorators'
-
-// ===================================================================
-
-describe('autobind()', () => {
-  class Foo {
-    @autobind
-    getFoo () {
-      return this
-    }
-  }
-
-  it('returns a bound instance for a method', () => {
-    const foo = new Foo()
-    const { getFoo } = foo
-
-    expect(getFoo()).to.equal(foo)
-  })
-
-  it('returns the same bound instance each time', () => {
-    const foo = new Foo()
-
-    expect(foo.getFoo).to.equal(foo.getFoo)
-  })
-
-  it('works with multiple instances of the same class', () => {
-    const foo1 = new Foo()
-    const foo2 = new Foo()
-
-    const getFoo1 = foo1.getFoo
-    const getFoo2 = foo2.getFoo
-
-    expect(getFoo1()).to.equal(foo1)
-    expect(getFoo2()).to.equal(foo2)
-  })
-})
-
-// -------------------------------------------------------------------
-
 describe('debounce()', () => {
  let i

@@ -60,114 +21,19 @@ describe('debounce()', () => {
  it('works', done => {
    const foo = new Foo()

-    expect(i).to.equal(0)
+    expect(i).toBe(0)

    foo.foo()
-    expect(i).to.equal(1)
+    expect(i).toBe(1)

    foo.foo()
-    expect(i).to.equal(1)
+    expect(i).toBe(1)

    setTimeout(() => {
      foo.foo()
-      expect(i).to.equal(2)
+      expect(i).toBe(2)

      done()
    }, 2e1)
  })
 })
-
-// -------------------------------------------------------------------
-
-describe('deferrable()', () => {
-  it('works with normal termination', () => {
-    let i = 0
-    const fn = deferrable(defer => {
-      i += 2
-      defer(() => { i -= 2 })
-
-      i *= 2
-      defer(() => { i /= 2 })
-
-      return i
-    })
-
-    expect(fn()).to.equal(4)
-    expect(i).to.equal(0)
-  })
-
-  it('defer.clear() removes previous deferreds', () => {
-    let i = 0
-    const fn = deferrable(defer => {
-      i += 2
-      defer(() => { i -= 2 })
-
-      defer.clear()
-
-      i *= 2
-      defer(() => { i /= 2 })
-
-      return i
-    })
-
-    expect(fn()).to.equal(4)
-    expect(i).to.equal(2)
-  })
-
-  it('works with exception', () => {
-    let i = 0
-    const fn = deferrable(defer => {
-      i += 2
-      defer(() => { i -= 2 })
-
-      i *= 2
-      defer(() => { i /= 2 })
-
-      throw i
-    })
-
-    expect(() => fn()).to.throw(4)
-    expect(i).to.equal(0)
-  })
-
-  it('works with promise resolution', async () => {
-    let i = 0
-    const fn = deferrable(async defer => {
-      i += 2
-      defer(() => { i -= 2 })
-
-      i *= 2
-      defer(() => { i /= 2 })
-
-      // Wait a turn of the events loop.
-      await Promise.resolve()
-
-      return i
-    })
-
-    await expect(fn()).to.eventually.equal(4)
-    expect(i).to.equal(0)
-  })
-
-  it('works with promise rejection', async () => {
-    let i = 0
-    const fn = deferrable(async defer => {
-      // Wait a turn of the events loop.
-      await Promise.resolve()
-
-      i += 2
-      defer(() => { i -= 2 })
-
-      i *= 2
-      defer(() => { i /= 2 })
-
-      // Wait a turn of the events loop.
-      await Promise.resolve()
-
-      throw i
-    })
-
-    await expect(fn()).to.reject.to.equal(4)
-    expect(i).to.equal(0)
-  })
-})
--- a/src/fatfs-buffer.js
+++ b/src/fatfs-buffer.js
@@ -20,14 +20,15 @@ import { boot16 as fat16 } from 'fatfs/structs'

 const SECTOR_SIZE = 512

+const TEN_MIB = 10 * 1024 * 1024
+
 // Creates a 10MB buffer and initializes it as a FAT 16 volume.
 export function init () {
-  const buf = new Buffer(10 * 1024 * 1024) // 10MB
-  buf.fill(0)
+  const buf = Buffer.alloc(TEN_MIB)

  // https://github.com/natevw/fatfs/blob/master/structs.js
  fat16.pack({
-    jmpBoot: new Buffer('eb3c90', 'hex'),
+    jmpBoot: Buffer.from('eb3c90', 'hex'),
    OEMName: 'mkfs.fat',
    BytsPerSec: SECTOR_SIZE,
    SecPerClus: 4,
--- a/src/http-request.js
+++ b/src/http-request.js
@@ -1,27 +1,23 @@
-import assign from 'lodash/assign'
-import startsWith from 'lodash/startsWith'
-import { parse as parseUrl } from 'url'
+import isRedirect from 'is-redirect'
+import { assign, isString, startsWith } from 'lodash'
+import { cancellable } from 'promise-toolbox'
 import { request as httpRequest } from 'http'
 import { request as httpsRequest } from 'https'
 import { stringify as formatQueryString } from 'querystring'
-
 import {
-  isString,
-  streamToBuffer
-} from './utils'
+  format as formatUrl,
+  parse as parseUrl,
+  resolve as resolveUrl
+} from 'url'
+
+import { streamToBuffer } from './utils'

 // -------------------------------------------------------------------

-export default (...args) => {
+const raw = opts => {
  let req

  const pResponse = new Promise((resolve, reject) => {
-    const opts = {}
-    for (let i = 0, length = args.length; i < length; ++i) {
-      const arg = args[i]
-      assign(opts, isString(arg) ? parseUrl(arg) : arg)
-    }
-
    const {
      body,
      headers: { ...headers } = {},
@@ -62,11 +58,16 @@ export default (...args) => {
      }
    }

-    req = (
-      protocol && startsWith(protocol.toLowerCase(), 'https')
-        ? httpsRequest
-        : httpRequest
-    )({
+    const secure = protocol && startsWith(protocol.toLowerCase(), 'https')
+    let requestFn
+    if (secure) {
+      requestFn = httpsRequest
+    } else {
+      requestFn = httpRequest
+      delete rest.rejectUnauthorized
+    }
+
+    req = requestFn({
      ...rest,
      headers
    })
@@ -98,6 +99,11 @@ export default (...args) => {
    }

    const code = response.statusCode
+    const { location } = response.headers
+    if (isRedirect(code) && location) {
+      assign(opts, parseUrl(resolveUrl(formatUrl(opts), location)))
+      return raw(opts)
+    }
    if (code < 200 || code >= 300) {
      const error = new Error(response.statusMessage)
      error.code = code
@@ -112,13 +118,27 @@ export default (...args) => {

    return response
  })
-
-  pResponse.cancel = () => {
-    req.emit('error', new Error('HTTP request canceled!'))
-    req.abort()
-  }
-  pResponse.readAll = () => pResponse.then(response => response.readAll())
  pResponse.request = req

  return pResponse
 }
+
+const httpRequestPlus = ($cancelToken, ...args) => {
+  const opts = {}
+  for (let i = 0, length = args.length; i < length; ++i) {
+    const arg = args[i]
+    assign(opts, isString(arg) ? parseUrl(arg) : arg)
+  }
+
+  const pResponse = raw(opts)
+
+  $cancelToken.promise.then(() => {
+    const { request } = pResponse
+    request.emit('error', new Error('HTTP request canceled!'))
+    request.abort()
+  })
+  pResponse.readAll = () => pResponse.then(response => response.readAll())
+
+  return pResponse
+}
+export default cancellable(httpRequestPlus)
--- a/src/index.js
+++ b/src/index.js
@@ -1,15 +1,12 @@
-import createLogger from 'debug'
-const debug = createLogger('xo:main')
-
 import appConf from 'app-conf'
 import bind from 'lodash/bind'
 import blocked from 'blocked'
 import createExpress from 'express'
+import createLogger from 'debug'
 import eventToPromise from 'event-to-promise'
 import has from 'lodash/has'
 import helmet from 'helmet'
 import includes from 'lodash/includes'
-import pick from 'lodash/pick'
 import proxyConsole from './proxy-console'
 import serveStatic from 'serve-static'
 import startsWith from 'lodash/startsWith'
@@ -18,21 +15,14 @@ import { compile as compilePug } from 'pug'
 import { createServer as createProxyServer } from 'http-proxy'
 import { join as joinPath } from 'path'

-import {
-  AlreadyAuthenticated,
-  InvalidCredential,
-  InvalidParameters,
-  NoSuchObject,
-  NotImplemented
-} from './api-errors'
 import JsonRpcPeer from 'json-rpc-peer'
+import { invalidCredentials } from 'xo-common/api-errors'
 import {
-  readFile,
-  readdir
+  ensureDir,
+  readdir,
+  readFile
 } from 'fs-promise'

-import * as apiMethods from './api/index'
-import Api from './api'
 import WebServer from 'http-server-plus'
 import Xo from './xo'
 import {
@@ -57,6 +47,8 @@ import { Strategy as LocalStrategy } from 'passport-local'

 // ===================================================================

+const debug = createLogger('xo:main')
+
 const warn = (...args) => {
  console.warn('[Warn]', ...args)
 }
@@ -139,6 +131,11 @@ async function setUpPassport (express, xo) {
    }))
  })

+  express.get('/signout', (req, res) => {
+    res.clearCookie('token')
+    res.redirect('/')
+  })
+
  const SIGNIN_STRATEGY_RE = /^\/signin\/([^/]+)(\/callback)?(:?\?.*)?$/
  express.use(async (req, res, next) => {
    const { url } = req
@@ -188,7 +185,7 @@ async function setUpPassport (express, xo) {
      next()
    } else if (req.cookies.token) {
      next()
-    } else if (/favicon|fontawesome|images|styles/.test(url)) {
+    } else if (/favicon|fontawesome|images|styles|\.(?:css|jpg|png)$/.test(url)) {
      next()
    } else {
      req.flash('return-url', url)
@@ -213,7 +210,7 @@ async function setUpPassport (express, xo) {

 async function registerPlugin (pluginPath, pluginName) {
  const plugin = require(pluginPath)
-  const { version = 'unknown' } = (() => {
+  const { description, version = 'unknown' } = (() => {
    try {
      return require(pluginPath + '/package.json')
    } catch (_) {
@@ -225,13 +222,19 @@ async function registerPlugin (pluginPath, pluginName) {
  const {
    default: factory = plugin,
    configurationSchema,
-    configurationPresets
+    configurationPresets,
+    testSchema
  } = plugin

  // The default export can be either a factory or directly a plugin
  // instance.
  const instance = isFunction(factory)
-    ? factory({ xo: this })
+    ? factory({
+      xo: this,
+      getDataDir: () => {
+        const dir = `${this._config.datadir}/${pluginName}`
+        return ensureDir(dir).then(() => dir)
+      }})
    : factory

  await this.registerPlugin(
@@ -239,6 +242,8 @@ async function registerPlugin (pluginPath, pluginName) {
    instance,
    configurationSchema,
    configurationPresets,
+    description,
+    testSchema,
    version
  )
 }
@@ -407,47 +412,13 @@ const setUpStaticFiles = (express, opts) => {

 // ===================================================================

-const errorClasses = {
-  ALREADY_AUTHENTICATED: AlreadyAuthenticated,
-  INVALID_CREDENTIAL: InvalidCredential,
-  INVALID_PARAMS: InvalidParameters,
-  NO_SUCH_OBJECT: NoSuchObject,
-  NOT_IMPLEMENTED: NotImplemented
-}
-
-const apiHelpers = {
-  getUserPublicProperties (user) {
-    // Handles both properties and wrapped models.
-    const properties = user.properties || user
-
-    return pick(properties, 'id', 'email', 'groups', 'permission', 'preferences', 'provider')
-  },
-
-  throw (errorId, data) {
-    throw new (errorClasses[errorId])(data)
-  }
-}
-
 const setUpApi = (webServer, xo, verboseLogsOnErrors) => {
  const webSocketServer = new WebSocket.Server({
-    server: webServer,
-    path: '/api/'
+    noServer: true
  })
  xo.on('stop', () => pFromCallback(cb => webSocketServer.close(cb)))

-  // FIXME: it can cause issues if there any property assignments in
-  // XO methods called from the API.
-  const context = { __proto__: xo, ...apiHelpers }
-
-  const api = new Api({
-    context,
-    verboseLogsOnErrors
-  })
-  xo.defineProperty('api', api)
-
-  api.addMethods(apiMethods)
-
-  webSocketServer.on('connection', socket => {
+  const onConnection = socket => {
    const { remoteAddress } = socket.upgradeReq.socket

    debug('+ WebSocket connection (%s)', remoteAddress)
@@ -461,7 +432,7 @@ const setUpApi = (webServer, xo, verboseLogsOnErrors) => {
    // Create the JSON-RPC server for this connection.
    const jsonRpc = new JsonRpcPeer(message => {
      if (message.type === 'request') {
-        return api.call(connection, message.method, message.params)
+        return xo.callApiMethod(connection, message.method, message.params)
      }
    })
    connection.notify = bind(jsonRpc.notify, jsonRpc)
@@ -490,6 +461,11 @@ const setUpApi = (webServer, xo, verboseLogsOnErrors) => {
        socket.send(data, onSend)
      }
    })
+  }
+  webServer.on('upgrade', (req, socket, head) => {
+    if (req.url === '/api/') {
+      webSocketServer.handleUpgrade(req, socket, head, onConnection)
+    }
  })
 }

@@ -517,7 +493,7 @@ const setUpConsoleProxy = (webServer, xo) => {

        const user = await xo.authenticateUser({ token })
        if (!await xo.hasPermissions(user.id, [ [ id, 'operate' ] ])) {
-          throw new InvalidCredential()
+          throw invalidCredentials()
        }

        const { remoteAddress } = socket
@@ -535,7 +511,7 @@ const setUpConsoleProxy = (webServer, xo) => {
        proxyConsole(connection, vmConsole, xapi.sessionId)
      })
    } catch (error) {
-      console.error(error && error.stack || error)
+      console.error((error && error.stack) || error)
    }
  })
 }
@@ -650,16 +626,24 @@ export default async function main (args) {
    await registerPlugins(xo)
  }

+  // Gracefully shutdown on signals.
+  //
  // TODO: implements a timeout? (or maybe it is the services launcher
  // responsibility?)
-  const shutdown = signal => {
-    debug('%s caught, closing…', signal)
-    xo.stop()
-  }
+  forEach([ 'SIGINT', 'SIGTERM' ], signal => {
+    let alreadyCalled = false

-  // Gracefully shutdown on signals.
-  process.on('SIGINT', () => shutdown('SIGINT'))
-  process.on('SIGTERM', () => shutdown('SIGTERM'))
+    process.on(signal, () => {
+      if (alreadyCalled) {
+        warn('forced exit')
+        process.exit(1)
+      }
+      alreadyCalled = true
+
+      debug('%s caught, closing…', signal)
+      xo.stop()
+    })
+  })

  await eventToPromise(xo, 'stopped')

--- a/src/job-executor.js
+++ b/src/job-executor.js
@@ -1,9 +1,20 @@
 import assign from 'lodash/assign'
-import {BaseError} from 'make-error'
+import Bluebird from 'bluebird'
+import every from 'lodash/every'
+import filter from 'lodash/filter'
+import isArray from 'lodash/isArray'
+import isPlainObject from 'lodash/isPlainObject'
+import map from 'lodash/map'
+import mapValues from 'lodash/mapValues'
+import size from 'lodash/size'
+import some from 'lodash/some'
+import { BaseError } from 'make-error'
+import { timeout } from 'promise-toolbox'

+import { crossProduct } from './math'
 import {
-  createRawObject,
-  forEach
+  serializeError,
+  thunkToArray
 } from './utils'

 export class JobExecutorError extends BaseError {}
@@ -18,30 +29,67 @@ export class UnsupportedVectorType extends JobExecutorError {
  }
 }

-export const productParams = (...args) => {
-  let product = createRawObject()
-  assign(product, ...args)
-  return product
+// ===================================================================
+
+const match = (pattern, value) => {
+  if (isPlainObject(pattern)) {
+    if (size(pattern) === 1) {
+      if (pattern.__or) {
+        return some(pattern.__or, subpattern => match(subpattern, value))
+      }
+      if (pattern.__not) {
+        return !match(pattern.__not, value)
+      }
+    }
+
+    return isPlainObject(value) && every(pattern, (subpattern, key) => (
+      value[key] !== undefined && match(subpattern, value[key])
+    ))
+  }
+
+  if (isArray(pattern)) {
+    return isArray(value) && every(pattern, subpattern =>
+      some(value, subvalue => match(subpattern, subvalue))
+    )
+  }
+
+  return pattern === value
 }

-export function _computeCrossProduct (items, productCb, extractValueMap = {}) {
-  const upstreamValues = []
-  const itemsCopy = items.slice()
-  const item = itemsCopy.pop()
-  const values = extractValueMap[item.type] && extractValueMap[item.type](item) || item
-  forEach(values, value => {
-    if (itemsCopy.length) {
-      let downstreamValues = _computeCrossProduct(itemsCopy, productCb, extractValueMap)
-      forEach(downstreamValues, downstreamValue => {
-        upstreamValues.push(productCb(value, downstreamValue))
+const paramsVectorActionsMap = {
+  extractProperties ({ mapping, value }) {
+    return mapValues(mapping, key => value[key])
+  },
+  crossProduct ({ items }) {
+    return thunkToArray(crossProduct(
+      map(items, value => resolveParamsVector.call(this, value))
+    ))
+  },
+  fetchObjects ({ pattern }) {
+    return filter(this.xo.getObjects(), object => match(pattern, object))
+  },
+  map ({ collection, iteratee, paramName = 'value' }) {
+    return map(resolveParamsVector.call(this, collection), value => {
+      return resolveParamsVector.call(this, {
+        ...iteratee,
+        [paramName]: value
      })
-    } else {
-      upstreamValues.push(value)
-    }
-  })
-  return upstreamValues
+    })
+  },
+  set: ({ values }) => values
 }

+export function resolveParamsVector (paramsVector) {
+  const visitor = paramsVectorActionsMap[paramsVector.type]
+  if (!visitor) {
+    throw new Error(`Unsupported function '${paramsVector.type}'.`)
+  }
+
+  return visitor.call(this, paramsVector)
+}
+
+// ===================================================================
+
 export default class JobExecutor {
  constructor (xo) {
    this.xo = xo
@@ -76,30 +124,24 @@ export default class JobExecutor {
        event: 'job.end',
        runJobId
      })
-    } catch (e) {
+    } catch (error) {
      this._logger.error(`The execution of ${job.id} has failed.`, {
        event: 'job.end',
        runJobId,
-        error: e
+        error: serializeError(error)
      })
+
+      throw error
    }
  }

  async _execCall (job, runJobId) {
-    let paramsFlatVector
-
-    if (job.paramsVector) {
-      if (job.paramsVector.type === 'crossProduct') {
-        paramsFlatVector = _computeCrossProduct(job.paramsVector.items, productParams, this._extractValueCb)
-      } else {
-        throw new UnsupportedVectorType(job.paramsVector)
-      }
-    } else {
-      paramsFlatVector = [{}] // One call with no parameters
-    }
+    const { paramsVector } = job
+    const paramsFlatVector = paramsVector
+      ? resolveParamsVector.call(this, paramsVector)
+      : [{}] // One call with no parameters

    const connection = this.xo.createUserConnection()
-    const promises = []

    connection.set('user_id', job.userId)

@@ -109,7 +151,7 @@ export default class JobExecutor {
      calls: {}
    }

-    forEach(paramsFlatVector, params => {
+    await Bluebird.map(paramsFlatVector, params => {
      const runCallId = this._logger.notice(`Starting ${job.method} call. (${job.id})`, {
        event: 'jobCall.start',
        runJobId,
@@ -122,37 +164,40 @@ export default class JobExecutor {
        params,
        start: Date.now()
      }
+      let promise = this.xo.callApiMethod(connection, job.method, assign({}, params))
+      if (job.timeout) {
+        promise = promise::timeout(job.timeout)
+      }

-      promises.push(
-        this.xo.api.call(connection, job.method, assign({}, params)).then(
-          value => {
-            this._logger.notice(`Call ${job.method} (${runCallId}) is a success. (${job.id})`, {
-              event: 'jobCall.end',
-              runJobId,
-              runCallId,
-              returnedValue: value
-            })
+      return promise.then(
+        value => {
+          this._logger.notice(`Call ${job.method} (${runCallId}) is a success. (${job.id})`, {
+            event: 'jobCall.end',
+            runJobId,
+            runCallId,
+            returnedValue: value
+          })

-            call.returnedValue = value
-            call.end = Date.now()
-          },
-          reason => {
-            this._logger.notice(`Call ${job.method} (${runCallId}) has failed. (${job.id})`, {
-              event: 'jobCall.end',
-              runJobId,
-              runCallId,
-              error: {...reason, message: reason.message}
-            })
+          call.returnedValue = value
+          call.end = Date.now()
+        },
+        reason => {
+          this._logger.notice(`Call ${job.method} (${runCallId}) has failed. (${job.id})`, {
+            event: 'jobCall.end',
+            runJobId,
+            runCallId,
+            error: serializeError(reason)
+          })

-            call.error = reason
-            call.end = Date.now()
-          }
-        )
+          call.error = reason
+          call.end = Date.now()
+        }
      )
+    }, {
+      concurrency: 2
    })

    connection.close()
-    await Promise.all(promises)
    execStatus.end = Date.now()

    return execStatus
--- a/src/job-executor.spec.js
+++ b/src/job-executor.spec.js
@@ -1,71 +1,100 @@
-/* eslint-env mocha */
+/* eslint-env jest */

-import {expect} from 'chai'
-import leche from 'leche'
+import { forEach } from 'lodash'
+import { resolveParamsVector } from './job-executor'

-import {
-  _computeCrossProduct,
-  productParams
-} from './job-executor'
+describe('resolveParamsVector', function () {
+  forEach({
+    'cross product with three sets': [
+      // Expected result.
+      [ { id: 3, value: 'foo', remote: 'local' },
+        { id: 7, value: 'foo', remote: 'local' },
+        { id: 10, value: 'foo', remote: 'local' },
+        { id: 3, value: 'bar', remote: 'local' },
+        { id: 7, value: 'bar', remote: 'local' },
+        { id: 10, value: 'bar', remote: 'local' } ],
+      // Entry.
+      {
+        type: 'crossProduct',
+        items: [{
+          type: 'set',
+          values: [ { id: 3 }, { id: 7 }, { id: 10 } ]
+        }, {
+          type: 'set',
+          values: [ { value: 'foo' }, { value: 'bar' } ]
+        }, {
+          type: 'set',
+          values: [ { remote: 'local' } ]
+        }]
+      }
+    ],
+    'cross product with `set` and `map`': [
+      // Expected result.
+      [
+        { remote: 'local', id: 'vm:2' },
+        { remote: 'smb', id: 'vm:2' }
+      ],

-describe('productParams', function () {
-  leche.withData({
-    'Two sets of one': [
-      {a: 1, b: 2}, {a: 1}, {b: 2}
-    ],
-    'Two sets of two': [
-      {a: 1, b: 2, c: 3, d: 4}, {a: 1, b: 2}, {c: 3, d: 4}
-    ],
-    'Three sets': [
-      {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}, {a: 1}, {b: 2, c: 3}, {d: 4, e: 5, f: 6}
-    ],
-    'One set': [
-      {a: 1, b: 2}, {a: 1, b: 2}
-    ],
-    'Empty set': [
-      {a: 1}, {a: 1}, {}
-    ],
-    'All empty': [
-      {}, {}, {}
-    ],
-    'No set': [
-      {}
+      // Entry.
+      {
+        type: 'crossProduct',
+        items: [{
+          type: 'set',
+          values: [ { remote: 'local' }, { remote: 'smb' } ]
+        }, {
+          type: 'map',
+          collection: {
+            type: 'fetchObjects',
+            pattern: {
+              $pool: { __or: [ 'pool:1', 'pool:8', 'pool:12' ] },
+              power_state: 'Running',
+              tags: [ 'foo' ],
+              type: 'VM'
+            }
+          },
+          iteratee: {
+            type: 'extractProperties',
+            mapping: { id: 'id' }
+          }
+        }]
+      },
+
+      // Context.
+      {
+        xo: {
+          getObjects: function () {
+            return [{
+              id: 'vm:1',
+              $pool: 'pool:1',
+              tags: [],
+              type: 'VM',
+              power_state: 'Halted'
+            }, {
+              id: 'vm:2',
+              $pool: 'pool:1',
+              tags: [ 'foo' ],
+              type: 'VM',
+              power_state: 'Running'
+            }, {
+              id: 'host:1',
+              type: 'host',
+              power_state: 'Running'
+            }, {
+              id: 'vm:3',
+              $pool: 'pool:8',
+              tags: [ 'foo' ],
+              type: 'VM',
+              power_state: 'Halted'
+            }]
+          }
+        }
+      }
    ]
-  }, function (resultSet, ...sets) {
-    it('Assembles all given param sets in on set', function () {
-      expect(productParams(...sets)).to.eql(resultSet)
-    })
-  })
-})
-
-describe('_computeCrossProduct', function () {
-  // Gives the sum of all args
-  const addTest = (...args) => args.reduce((prev, curr) => prev + curr, 0)
-  // Gives the product of all args
-  const multiplyTest = (...args) => args.reduce((prev, curr) => prev * curr, 1)
-
-  leche.withData({
-    '2 sets of 2 items to multiply': [
-      [10, 14, 15, 21], [[2, 3], [5, 7]], multiplyTest
-    ],
-    '3 sets of 2 items to multiply': [
-      [110, 130, 154, 182, 165, 195, 231, 273], [[2, 3], [5, 7], [11, 13]], multiplyTest
-    ],
-    '2 sets of 3 items to multiply': [
-      [14, 22, 26, 21, 33, 39, 35, 55, 65], [[2, 3, 5], [7, 11, 13]], multiplyTest
-    ],
-    '2 sets of 2 items to add': [
-      [7, 9, 8, 10], [[2, 3], [5, 7]], addTest
-    ],
-    '3 sets of 2 items to add': [
-      [18, 20, 20, 22, 19, 21, 21, 23], [[2, 3], [5, 7], [11, 13]], addTest
-    ],
-    '2 sets of 3 items to add': [
-      [9, 13, 15, 10, 14, 16, 12, 16, 18], [[2, 3, 5], [7, 11, 13]], addTest
-    ]
-  }, function (product, items, cb) {
-    it('Crosses sets of values with a crossProduct callback', function () {
-      expect(_computeCrossProduct(items, cb)).to.have.members(product)
+  }, ([ expectedResult, entry, context ], name) => {
+    describe(`with ${name}`, () => {
+      it('Resolves params vector', () => {
+        expect(resolveParamsVector.call(context, entry)).toEqual(expectedResult)
+      })
    })
  })
 })
--- a/src/lvm.js
+++ b/src/lvm.js
@@ -0,0 +1,33 @@
+import execa from 'execa'
+import splitLines from 'split-lines'
+import { createParser } from 'parse-pairs'
+import { isArray, map } from 'lodash'
+
+// ===================================================================
+
+const parse = createParser({
+  keyTransform: key => key.slice(5).toLowerCase()
+})
+const makeFunction = command => (fields, ...args) =>
+  execa.stdout(command, [
+    '--noheading',
+    '--nosuffix',
+    '--nameprefixes',
+    '--unbuffered',
+    '--units',
+    'b',
+    '-o',
+    String(fields),
+    ...args
+  ]).then(stdout => map(
+    splitLines(stdout),
+    isArray(fields)
+      ? parse
+      : line => {
+        const data = parse(line)
+        return data[fields]
+      }
+  ))
+
+export const lvs = makeFunction('lvs')
+export const pvs = makeFunction('pvs')
--- a/src/math.js
+++ b/src/math.js
@@ -0,0 +1,48 @@
+import assign from 'lodash/assign'
+
+const _combine = (vectors, n, cb) => {
+  if (!n) {
+    return
+  }
+
+  const nLast = n - 1
+
+  const vector = vectors[nLast]
+  const m = vector.length
+  if (n === 1) {
+    for (let i = 0; i < m; ++i) {
+      cb([ vector[i] ]) // eslint-disable-line standard/no-callback-literal
+    }
+    return
+  }
+
+  for (let i = 0; i < m; ++i) {
+    const value = vector[i]
+
+    _combine(vectors, nLast, (vector) => {
+      vector.push(value)
+      cb(vector)
+    })
+  }
+}
+
+// Compute all combinations from vectors.
+//
+// Ex: combine([[2, 3], [5, 7]])
+// => [ [ 2, 5 ], [ 3, 5 ], [ 2, 7 ], [ 3, 7 ] ]
+export const combine = vectors => cb => _combine(vectors, vectors.length, cb)
+
+// Merge the properties of an objects set in one object.
+//
+// Ex: mergeObjects([ { a: 1 }, { b: 2 } ]) => { a: 1, b: 2 }
+export const mergeObjects = objects => assign({}, ...objects)
+
+// Compute a cross product between vectors.
+//
+// Ex: crossProduct([ [ { a: 2 }, { b: 3 } ], [ { c: 5 }, { d: 7 } ] ] )
+// => [ { a: 2, c: 5 }, { b: 3, c: 5 }, { a: 2, d: 7 }, { b: 3, d: 7 } ]
+export const crossProduct = (vectors, mergeFn = mergeObjects) => cb => (
+  combine(vectors)(vector => {
+    cb(mergeFn(vector))
+  })
+)
--- a/src/math.spec.js
+++ b/src/math.spec.js
@@ -0,0 +1,74 @@
+/* eslint-env jest */
+
+import { forEach } from 'lodash'
+import { thunkToArray } from './utils'
+import {
+  crossProduct,
+  mergeObjects
+} from './math'
+
+describe('mergeObjects', function () {
+  forEach({
+    'Two sets of one': [
+      {a: 1, b: 2}, {a: 1}, {b: 2}
+    ],
+    'Two sets of two': [
+      {a: 1, b: 2, c: 3, d: 4}, {a: 1, b: 2}, {c: 3, d: 4}
+    ],
+    'Three sets': [
+      {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}, {a: 1}, {b: 2, c: 3}, {d: 4, e: 5, f: 6}
+    ],
+    'One set': [
+      {a: 1, b: 2}, {a: 1, b: 2}
+    ],
+    'Empty set': [
+      {a: 1}, {a: 1}, {}
+    ],
+    'All empty': [
+      {}, {}, {}
+    ],
+    'No set': [
+      {}
+    ]
+  }, ([ resultSet, ...sets ], name) => {
+    describe(`with ${name}`, () => {
+      it('Assembles all given param sets in on set', function () {
+        expect(mergeObjects(sets)).toEqual(resultSet)
+      })
+    })
+  })
+})
+
+describe('crossProduct', function () {
+  // Gives the sum of all args
+  const addTest = args => args.reduce((prev, curr) => prev + curr, 0)
+  // Gives the product of all args
+  const multiplyTest = args => args.reduce((prev, curr) => prev * curr, 1)
+
+  forEach({
+    '2 sets of 2 items to multiply': [
+      [10, 14, 15, 21], [[2, 3], [5, 7]], multiplyTest
+    ],
+    '3 sets of 2 items to multiply': [
+      [110, 130, 154, 182, 165, 195, 231, 273], [[2, 3], [5, 7], [11, 13]], multiplyTest
+    ],
+    '2 sets of 3 items to multiply': [
+      [14, 22, 26, 21, 33, 39, 35, 55, 65], [[2, 3, 5], [7, 11, 13]], multiplyTest
+    ],
+    '2 sets of 2 items to add': [
+      [7, 9, 8, 10], [[2, 3], [5, 7]], addTest
+    ],
+    '3 sets of 2 items to add': [
+      [18, 20, 20, 22, 19, 21, 21, 23], [[2, 3], [5, 7], [11, 13]], addTest
+    ],
+    '2 sets of 3 items to add': [
+      [9, 13, 15, 10, 14, 16, 12, 16, 18], [[2, 3, 5], [7, 11, 13]], addTest
+    ]
+  }, ([ product, items, cb ], name) => {
+    describe(`with ${name}`, () => {
+      it('Crosses sets of values with a crossProduct callback', function () {
+        expect(thunkToArray(crossProduct(items, cb)).sort()).toEqual(product.sort())
+      })
+    })
+  })
+})
--- a/src/models/group.js
+++ b/src/models/group.js
@@ -1,8 +1,12 @@
+import isEmpty from 'lodash/isEmpty'
+
 import Collection from '../collection/redis'
 import Model from '../model'

 import { forEach } from '../utils'

+import { parseProp } from './utils'
+
 // ===================================================================

 export default class Group extends Model {}
@@ -14,20 +18,16 @@ export class Groups extends Collection {
    return Group
  }

-  get idPrefix () {
-    return 'group:'
-  }
-
  create (name) {
-    return this.add(new Group({
-      name,
-      users: '[]'
-    }))
+    return this.add(new Group({ name }))
  }

  async save (group) {
    // Serializes.
-    group.users = JSON.stringify(group.users)
+    let tmp
+    group.users = isEmpty(tmp = group.users)
+      ? undefined
+      : JSON.stringify(tmp)

    return /* await */ this.update(group)
  }
@@ -37,13 +37,7 @@ export class Groups extends Collection {

    // Deserializes.
    forEach(groups, group => {
-      const {users} = group
-      try {
-        group.users = JSON.parse(users)
-      } catch (error) {
-        console.warn('cannot parse group.users:', users)
-        group.users = []
-      }
+      group.users = parseProp('group', group, 'users', [])
    })

    return groups
--- a/src/models/job.js
+++ b/src/models/job.js
@@ -11,12 +11,7 @@ export class Jobs extends Collection {
    return Job
  }

-  get idPrefix () {
-    return 'job:'
-  }
-
-  async create (userId, job) {
-    job.userId = userId
+  async create (job) {
    // Serializes.
    job.paramsVector = JSON.stringify(job.paramsVector)
    return /* await */ this.add(new Job(job))
--- a/src/models/plugin-metadata.js
+++ b/src/models/plugin-metadata.js
@@ -13,10 +13,6 @@ export class PluginsMetadata extends Collection {
    return PluginMetadata
  }

-  get idPrefix () {
-    return 'plugin-metadata:'
-  }
-
  async save ({ id, autoload, configuration }) {
    return /* await */ this.update({
      id,
--- a/src/models/remote.js
+++ b/src/models/remote.js
@@ -13,10 +13,6 @@ export class Remotes extends Collection {
    return Remote
  }

-  get idPrefix () {
-    return 'remote-'
-  }
-
  create (name, url) {
    return this.add(new Remote({
      name,
--- a/src/models/schedule.js
+++ b/src/models/schedule.js
@@ -11,10 +11,6 @@ export class Schedules extends Collection {
    return Schedule
  }

-  get idPrefix () {
-    return 'schedule:'
-  }
-
  create (userId, job, cron, enabled, name = undefined, timezone = undefined) {
    return this.add(new Schedule({
      userId,
--- a/src/models/server.js
+++ b/src/models/server.js
@@ -1,5 +1,8 @@
 import Collection from '../collection/redis'
 import Model from '../model'
+import { forEach } from '../utils'
+
+import { parseProp } from './utils'

 // ===================================================================

@@ -12,11 +15,26 @@ export class Servers extends Collection {
    return Server
  }

-  async create ({host, username, password, readOnly}) {
+  async create ({label, host, username, password, readOnly}) {
    if (await this.exists({host})) {
      throw new Error('server already exists')
    }

-    return /* await */ this.add({host, username, password, readOnly})
+    return /* await */ this.add({label, host, username, password, readOnly})
+  }
+
+  async get (properties) {
+    const servers = await super.get(properties)
+
+    // Deserializes
+    forEach(servers, server => {
+      if (server.error) {
+        server.error = parseProp('server', server, 'error', '')
+      } else {
+        delete server.error
+      }
+    })
+
+    return servers
  }
 }
--- a/src/models/user.js
+++ b/src/models/user.js
@@ -4,6 +4,8 @@ import Collection from '../collection/redis'
 import Model from '../model'
 import { forEach } from '../utils'

+import { parseProp } from './utils'
+
 // ===================================================================

 export default class User extends Model {}
@@ -14,32 +16,19 @@ User.prototype.default = {

 // -------------------------------------------------------------------

-const parseProp = (obj, name) => {
-  const value = obj[name]
-  if (value == null) {
-    return
-  }
-  try {
-    return JSON.parse(value)
-  } catch (error) {
-    console.warn('cannot parse user[%s] (%s):', name, value, error)
-  }
-}
-
 export class Users extends Collection {
  get Model () {
    return User
  }

-  async create (email, properties = {}) {
+  async create (properties) {
+    const { email } = properties
+
    // Avoid duplicates.
    if (await this.exists({email})) {
      throw new Error(`the user ${email} already exists`)
    }

-    // Adds the email to the user's properties.
-    properties.email = email
-
    // Create the user object.
    const user = new User(properties)

@@ -50,12 +39,12 @@ export class Users extends Collection {
  async save (user) {
    // Serializes.
    let tmp
-    if (!isEmpty(tmp = user.groups)) {
-      user.groups = JSON.stringify(tmp)
-    }
-    if (!isEmpty(tmp = user.preferences)) {
-      user.preferences = JSON.stringify(tmp)
-    }
+    user.groups = isEmpty(tmp = user.groups)
+      ? undefined
+      : JSON.stringify(tmp)
+    user.preferences = isEmpty(tmp = user.preferences)
+     ? undefined
+     : JSON.stringify(tmp)

    return /* await */ this.update(user)
  }
@@ -65,11 +54,8 @@ export class Users extends Collection {

    // Deserializes
    forEach(users, user => {
-      let tmp
-      user.groups = ((tmp = parseProp(user, 'groups')) && tmp.length)
-        ? tmp
-        : undefined
-      user.preferences = parseProp(user, 'preferences')
+      user.groups = parseProp('user', user, 'groups', [])
+      user.preferences = parseProp('user', user, 'preferences', {})
    })

    return users
--- a/src/models/utils.js
+++ b/src/models/utils.js
@@ -0,0 +1,16 @@
+export const parseProp = (type, obj, name, defaultValue) => {
+  const value = obj[name]
+  if (
+    value == null ||
+    value === '' // do not warn on this trivial and minor error
+  ) {
+    return defaultValue
+  }
+  try {
+    return JSON.parse(value)
+  } catch (error) {
+    // do not display the error because it can occurs a lot and fill
+    // up log files
+    return defaultValue
+  }
+}
--- a/src/node_modules/constant-stream.js
+++ b/src/node_modules/constant-stream.js
@@ -0,0 +1,42 @@
+import from2 from 'from2'
+
+const constantStream = (data, n = 1) => {
+  if (!Buffer.isBuffer(data)) {
+    data = Buffer.from(data)
+  }
+
+  const { length } = data
+
+  if (!length) {
+    throw new Error('data should not be empty')
+  }
+
+  n *= length
+  let currentLength = length
+
+  return from2((size, next) => {
+    if (n <= 0) {
+      return next(null, null)
+    }
+
+    if (n < size) {
+      size = n
+    }
+
+    if (size < currentLength) {
+      const m = Math.floor(size / length) * length || length
+      n -= m
+      return next(null, data.slice(0, m))
+    }
+
+    // if more than twice the data length is requested, repeat the data
+    if (size > currentLength * 2) {
+      currentLength = Math.floor(size / length) * length
+      data = Buffer.alloc(currentLength, data)
+    }
+
+    n -= currentLength
+    return next(null, data)
+  })
+}
+export { constantStream as default }
--- a/src/proxy-console.js
+++ b/src/proxy-console.js
@@ -56,7 +56,7 @@ export default function proxyConsole (ws, vmConsole, sessionId) {
      .on('message', data => {
        if (!closed) {
          // Decode from base 64.
-          socket.write(new Buffer(data, 'base64'))
+          socket.write(Buffer.from(data, 'base64'))
        }
      })
      .on('close', () => {
--- a/src/remote-handlers/abstract.js
+++ b/src/remote-handlers/abstract.js
@@ -112,48 +112,64 @@ export default class RemoteHandlerAbstract {
    throw new Error('Not implemented')
  }

-  async createReadStream (file, {
+  createReadStream (file, {
    checksum = false,
    ignoreMissingChecksum = false,
    ...options
  } = {}) {
-    const streamP = this._createReadStream(file, options).then(async stream => {
-      await eventToPromise(stream, 'readable')
+    const streamP = this._createReadStream(file, options).then(stream => {
+      // detect early errors
+      let promise = eventToPromise(stream, 'readable')

-      if (stream.length === undefined) {
-        stream.length = await this.getSize(file)::pCatch(noop)
+      // try to add the length prop if missing and not a range stream
+      if (
+        stream.length === undefined &&
+        options.end === undefined &&
+        options.start === undefined
+      ) {
+        promise = Promise.all([ promise, this.getSize(file).then(size => {
+          stream.length = size
+        }, noop) ])
      }

-      return stream
+      return promise.then(() => stream)
    })

    if (!checksum) {
      return streamP
    }

-    try {
-      checksum = await this.readFile(`${file}.checksum`)
-    } catch (error) {
-      if (error.code === 'ENOENT' && ignoreMissingChecksum) {
-        return streamP
+    // avoid a unhandled rejection warning
+    streamP.catch(noop)
+
+    return this.readFile(`${file}.checksum`).then(
+      checksum => streamP.then(stream => {
+        const { length } = stream
+        stream = validChecksumOfReadStream(stream, String(checksum).trim())
+        stream.length = length
+
+        return stream
+      }),
+      error => {
+        if (ignoreMissingChecksum && error && error.code === 'ENOENT') {
+          return streamP
+        }
+        throw error
      }
-
-      throw error
-    }
-
-    let stream = await streamP
-
-    const { length } = stream
-    stream = validChecksumOfReadStream(stream, checksum.toString())
-    stream.length = length
-
-    return stream
+    )
  }

  async _createReadStream (file, options) {
    throw new Error('Not implemented')
  }

+  async refreshChecksum (path) {
+    const stream = addChecksumToReadStream(await this.createReadStream(path))
+    stream.resume() // start reading the whole file
+    const checksum = await stream.checksum
+    await this.outputFile(`${path}.checksum`, checksum)
+  }
+
  async createOutputStream (file, {
    checksum = false,
    ...options
--- a/src/remote-handlers/local.js
+++ b/src/remote-handlers/local.js
@@ -86,5 +86,4 @@ export default class LocalHandler extends RemoteHandlerAbstract {
    const stats = await fs.stat(this._getFilePath(file))
    return stats.size
  }
-
 }
--- a/src/remote-handlers/nfs.js
+++ b/src/remote-handlers/nfs.js
@@ -12,7 +12,7 @@ export default class NfsHandler extends LocalHandler {
  }

  _getRealPath () {
-    return `/tmp/xo-server/mounts/${this._remote.id}`
+    return `/run/xo-server/mounts/${this._remote.id}`
  }

  async _loadRealMounts () {
@@ -79,6 +79,6 @@ export default class NfsHandler extends LocalHandler {
  }

  async _umount (remote) {
-    await execa('umount', [remote.path])
+    await execa('umount', [this._getRealPath()])
  }
 }
--- a/src/schemas/job.js
+++ b/src/schemas/job.js
@@ -1,5 +1,3 @@
-import paramsVector from 'job/params-vector'
-
 export default {
  $schema: 'http://json-schema.org/draft-04/schema#',
  type: 'object',
@@ -27,7 +25,13 @@ export default {
      type: 'string',
      description: 'called method'
    },
-    paramsVector
+    paramsVector: {
+      type: 'object'
+    },
+    timeout: {
+      type: 'number',
+      description: 'number of milliseconds after which the job is considered failed'
+    }
  },
  required: [
    'type',
--- a/src/schemas/job/params-vector.js
+++ b/src/schemas/job/params-vector.js
@@ -1,59 +0,0 @@
-export default {
-  $schema: 'http://json-schema.org/draft-04/schema#',
-  type: 'object',
-  properties: {
-    type: {
-      enum: ['crossProduct']
-    },
-    items: {
-      type: 'array',
-      description: 'vector of values to multiply with others vectors',
-      items: {
-        type: 'object',
-        properties: {
-          type: {
-            enum: ['set']
-          },
-          values: {
-            type: 'array',
-            items: {
-              type: 'object'
-            },
-            minItems: 1
-          }
-        },
-        required: [
-          'type',
-          'values'
-        ]
-      },
-      minItems: 1
-    }
-  },
-  required: [
-    'type',
-    'items'
-  ]
-}
-
-/* Example:
-{
-  "type": "cross product",
-  "items": [
-    {
-      "type": "set",
-      "values":  [
-        {"id": 0, "name": "snapshost de 0"},
-        {"id": 1, "name": "snapshost de 1"}
-      ],
-    },
-    {
-      "type": "set",
-      "values": [
-        {"force": true}
-      ]
-    }
-  ]
-}
-
-*/
--- a/src/schemas/plugin.js
+++ b/src/schemas/plugin.js
@@ -20,7 +20,7 @@ export default {
    },
    unloadable: {
      type: 'boolean',
-      default: 'true',
+      default: true,
      description: 'whether or not this plugin can be unloaded'
    },
    configuration: {
@@ -30,6 +30,14 @@ export default {
    configurationSchema: {
      $ref: 'http://json-schema.org/draft-04/schema#',
      description: 'configuration schema for this plugin (not present if not configurable)'
+    },
+    testable: {
+      type: 'boolean',
+      description: 'whether or not this plugin can be tested'
+    },
+    testSchema: {
+      $ref: 'http://json-schema.org/draft-04/schema#',
+      description: 'test schema for this plugin'
    }
  },
  required: [
--- a/src/stream-to-existing-buffer.js
+++ b/src/stream-to-existing-buffer.js
@@ -0,0 +1,44 @@
+import assert from 'assert'
+
+const streamToExistingBuffer = (
+  stream,
+  buffer,
+  offset = 0,
+  end = buffer.length
+) => new Promise((resolve, reject) => {
+  assert(offset >= 0)
+  assert(end > offset)
+  assert(end <= buffer.length)
+
+  let i = offset
+
+  const onData = chunk => {
+    const prev = i
+    i += chunk.length
+
+    if (i > end) {
+      return onError(new Error('too much data'))
+    }
+
+    chunk.copy(buffer, prev)
+  }
+  stream.on('data', onData)
+
+  const clean = () => {
+    stream.removeListener('data', onData)
+    stream.removeListener('end', onEnd)
+    stream.removeListener('error', onError)
+  }
+  const onEnd = () => {
+    resolve(i - offset)
+    clean()
+  }
+  stream.on('end', onEnd)
+  const onError = error => {
+    reject(error)
+    clean()
+  }
+  stream.on('error', onError)
+})
+
+export { streamToExistingBuffer as default }
--- a/src/stream-to-existing-buffer.spec.js
+++ b/src/stream-to-existing-buffer.spec.js
@@ -0,0 +1,20 @@
+/* eslint-env jest */
+
+import { createReadStream, readFile } from 'fs'
+import { fromCallback } from 'promise-toolbox'
+
+import streamToExistingBuffer from './stream-to-existing-buffer'
+
+describe('streamToExistingBuffer()', () => {
+  it('read the content of a stream in a buffer', async () => {
+    const stream = createReadStream(__filename)
+
+    const expected = await fromCallback(cb => readFile(__filename, 'utf-8', cb))
+
+    const buf = Buffer.allocUnsafe(expected.length + 1)
+    buf[0] = 'A'.charCodeAt()
+    await streamToExistingBuffer(stream, buf, 1)
+
+    expect(String(buf)).toBe(`A${expected}`)
+  })
+})
--- a/src/stream-to-new-buffer.js
+++ b/src/stream-to-new-buffer.js
@@ -0,0 +1,27 @@
+const streamToNewBuffer = stream => new Promise((resolve, reject) => {
+  const chunks = []
+  let length = 0
+
+  const onData = chunk => {
+    chunks.push(chunk)
+    length += chunk.length
+  }
+  stream.on('data', onData)
+
+  const clean = () => {
+    stream.removeListener('data', onData)
+    stream.removeListener('end', onEnd)
+    stream.removeListener('error', onError)
+  }
+  const onEnd = () => {
+    resolve(Buffer.concat(chunks, length))
+    clean()
+  }
+  stream.on('end', onEnd)
+  const onError = error => {
+    reject(error)
+    clean()
+  }
+  stream.on('error', onError)
+})
+export { streamToNewBuffer as default }
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,7 +1,6 @@
 import base64url from 'base64url'
 import eventToPromise from 'event-to-promise'
 import forEach from 'lodash/forEach'
-import getStream from 'get-stream'
 import has from 'lodash/has'
 import highland from 'highland'
 import humanFormat from 'human-format'
@@ -11,17 +10,24 @@ import isString from 'lodash/isString'
 import keys from 'lodash/keys'
 import kindOf from 'kindof'
 import multiKeyHashInt from 'multikey-hash'
+import pick from 'lodash/pick'
+import tmp from 'tmp'
 import xml2js from 'xml2js'
+import { resolve } from 'path'

 // Moment timezone can be loaded only one time, it's a workaround to load
 // the latest version because cron module uses an old version of moment which
 // does not implement `guess` function for example.
 import 'moment-timezone'

+import through2 from 'through2'
 import { CronJob } from 'cron'
+import { Readable } from 'stream'
+import { utcFormat, utcParse } from 'd3-time-format'
 import {
  all as pAll,
  defer,
+  fromCallback,
  promisify,
  reflect as pReflect
 } from 'promise-toolbox'
@@ -29,9 +35,6 @@ import {
  createHash,
  randomBytes
 } from 'crypto'
-import { Readable } from 'stream'
-import through2 from 'through2'
-import {utcFormat as d3TimeFormat} from 'd3-time-format'

 // ===================================================================

@@ -53,13 +56,13 @@ export function bufferToStream (buf) {
  return stream
 }

-export const streamToBuffer = getStream.buffer
+export streamToBuffer from './stream-to-new-buffer'

 // -------------------------------------------------------------------

 export function camelToSnakeCase (string) {
  return string.replace(
-    /([a-z])([A-Z])/g,
+    /([a-z0-9])([A-Z])/g,
    (_, prevChar, currChar) => `${prevChar}_${currChar.toLowerCase()}`
  )
 }
@@ -73,6 +76,27 @@ export const createRawObject = Object.create

 // -------------------------------------------------------------------

+// Only works with string items!
+export const diffItems = (coll1, coll2) => {
+  const removed = createRawObject()
+  forEach(coll2, value => {
+    removed[value] = true
+  })
+
+  const added = []
+  forEach(coll1, value => {
+    if (value in removed) {
+      delete removed[value]
+    } else {
+      added.push(value)
+    }
+  })
+
+  return [ added, keys(removed) ]
+}
+
+// -------------------------------------------------------------------
+
 const ALGORITHM_TO_ID = {
  md5: '1',
  sha256: '5',
@@ -177,8 +201,15 @@ export function extractProperty (obj, prop) {

 // -------------------------------------------------------------------

+export const getUserPublicProperties = user => pick(
+  user.properties || user,
+  'id', 'email', 'groups', 'permission', 'preferences', 'provider'
+)
+
+// -------------------------------------------------------------------
+
 export const getPseudoRandomBytes = n => {
-  const bytes = new Buffer(n)
+  const bytes = Buffer.allocUnsafe(n)

  const odd = n & 1
  for (let i = 0, m = n - odd; i < m; i += 2) {
@@ -197,7 +228,7 @@ export const generateUnsecureToken = (n = 32) => base64url(getPseudoRandomBytes(
 // Generate a secure random Base64 string.
 export const generateToken = (randomBytes => {
  return (n = 32) => randomBytes(n).then(base64url)
-})(randomBytes::promisify())
+})(promisify(randomBytes))

 // -------------------------------------------------------------------

@@ -362,7 +393,9 @@ export const popProperty = obj => {

 // Format a date in ISO 8601 in a safe way to be used in filenames
 // (even on Windows).
-export const safeDateFormat = d3TimeFormat('%Y%m%dT%H%M%SZ')
+export const safeDateFormat = utcFormat('%Y%m%dT%H%M%SZ')
+
+export const safeDateParse = utcParse('%Y%m%dT%H%M%SZ')

 // -------------------------------------------------------------------

@@ -421,7 +454,7 @@ export function map (
 export const multiKeyHash = (...args) => new Promise(resolve => {
  const hash = multiKeyHashInt(...args)

-  const buf = new Buffer(4)
+  const buf = Buffer.allocUnsafe(4)
  buf.writeUInt32LE(hash, 0)

  resolve(base64url(buf))
@@ -429,6 +462,11 @@ export const multiKeyHash = (...args) => new Promise(resolve => {

 // -------------------------------------------------------------------

+export const resolveSubpath = (root, path) =>
+  resolve(root, `./${resolve('/', path)}`)
+
+// -------------------------------------------------------------------
+
 export const streamToArray = (stream, {
  filter,
  mapper
@@ -460,7 +498,7 @@ export const scheduleFn = (cronTime, fn, timeZone) => {
      try {
        await fn()
      } catch (error) {
-        console.error('[WARN] scheduled function:', error && error.stack || error)
+        console.error('[WARN] scheduled function:', (error && error.stack) || error)
      } finally {
        running = false
      }
@@ -476,5 +514,68 @@ export const scheduleFn = (cronTime, fn, timeZone) => {

 // -------------------------------------------------------------------

+// Create a serializable object from an error.
+export const serializeError = error => ({
+  message: error.message,
+  stack: error.stack,
+  ...error // Copy enumerable properties.
+})
+
+// -------------------------------------------------------------------
+
+// Create an array which contains the results of one thunk function.
+// Only works with synchronous thunks.
+export const thunkToArray = thunk => {
+  const values = []
+  thunk(::values.push)
+  return values
+}
+
+// -------------------------------------------------------------------
+
+// Creates a new function which throws an error.
+//
+// ```js
+// promise.catch(throwFn('an error has occured'))
+//
+// function foo (param = throwFn('param is required')()) {}
+// ```
+export const throwFn = error => () => {
+  throw (
+    isString(error)
+      ? new Error(error)
+      : error
+  )
+}
+
+// -------------------------------------------------------------------
+
+export const tmpDir = () => fromCallback(cb => tmp.dir(cb))
+
+// -------------------------------------------------------------------
+
 // Wrap a value in a function.
 export const wrap = value => () => value
+
+// -------------------------------------------------------------------
+
+export const mapFilter = (collection, iteratee) => {
+  const result = []
+  forEach(collection, (...args) => {
+    const value = iteratee(...args)
+    if (value) {
+      result.push(value)
+    }
+  })
+  return result
+}
+
+// -------------------------------------------------------------------
+
+export const splitFirst = (string, separator) => {
+  const i = string.indexOf(separator)
+  return i === -1 ? null : [
+    string.slice(0, i),
+    string.slice(i + separator.length)
+  ]
+}
--- a/src/utils.spec.js
+++ b/src/utils.spec.js
@@ -1,12 +1,9 @@
-/* eslint-env mocha */
-
-import expect from 'must'
-
-// ===================================================================
+/* eslint-env jest */

 import {
  camelToSnakeCase,
  createRawObject,
+  diffItems,
  ensureArray,
  extractProperty,
  formatXml,
@@ -19,57 +16,69 @@ import {

 describe('camelToSnakeCase()', function () {
  it('converts a string from camelCase to snake_case', function () {
-    expect(camelToSnakeCase('fooBar')).to.equal('foo_bar')
+    expect(camelToSnakeCase('fooBar')).toBe('foo_bar')
+    expect(camelToSnakeCase('ipv4Allowed')).toBe('ipv4_allowed')
  })

  it('does not alter snake_case strings', function () {
-    expect(camelToSnakeCase('foo_bar')).to.equal('foo_bar')
+    expect(camelToSnakeCase('foo_bar')).toBe('foo_bar')
+    expect(camelToSnakeCase('ipv4_allowed')).toBe('ipv4_allowed')
  })

  it('does not alter upper case letters expect those from the camelCase', function () {
-    expect(camelToSnakeCase('fooBar_BAZ')).to.equal('foo_bar_BAZ')
+    expect(camelToSnakeCase('fooBar_BAZ')).toBe('foo_bar_BAZ')
  })
 })

 // -------------------------------------------------------------------

 describe('createRawObject()', () => {
-  it('returns an object', () => {
-    expect(createRawObject()).to.be.an.object()
-  })
-
  it('returns an empty object', () => {
-    expect(createRawObject()).to.be.empty()
+    expect(createRawObject()).toEqual({})
  })

  it('creates a new object each time', () => {
-    expect(createRawObject()).to.not.equal(createRawObject())
+    expect(createRawObject()).not.toBe(createRawObject())
  })

  if (Object.getPrototypeOf) {
    it('creates an object without a prototype', () => {
-      expect(Object.getPrototypeOf(createRawObject())).to.be.null()
+      expect(Object.getPrototypeOf(createRawObject())).toBe(null)
    })
  }
 })

 // -------------------------------------------------------------------

+describe('diffItems', () => {
+  it('computes the added/removed items between 2 iterables', () => {
+    expect(diffItems(
+      ['foo', 'bar'],
+      ['baz', 'foo']
+    )).toEqual([
+      ['bar'],
+      ['baz']
+    ])
+  })
+})
+
+// -------------------------------------------------------------------
+
 describe('ensureArray()', function () {
  it('wrap the value in an array', function () {
    const value = 'foo'

-    expect(ensureArray(value)).to.eql([value])
+    expect(ensureArray(value)).toEqual([value])
  })

  it('returns an empty array for undefined', function () {
-    expect(ensureArray(undefined)).to.eql([])
+    expect(ensureArray(undefined)).toEqual([])
  })

  it('returns the object itself if is already an array', function () {
    const array = ['foo', 'bar', 'baz']

-    expect(ensureArray(array)).to.equal(array)
+    expect(ensureArray(array)).toBe(array)
  })
 })

@@ -80,15 +89,15 @@ describe('extractProperty()', function () {
    const value = {}
    const obj = { prop: value }

-    expect(extractProperty(obj, 'prop')).to.equal(value)
+    expect(extractProperty(obj, 'prop')).toBe(value)
  })

  it('removes the property from the object', function () {
    const value = {}
    const obj = { prop: value }

-    expect(extractProperty(obj, 'prop')).to.equal(value)
-    expect(obj).to.not.have.property('prop')
+    expect(extractProperty(obj, 'prop')).toBe(value)
+    expect(obj.prop).not.toBeDefined()
  })
 })

@@ -103,7 +112,7 @@ describe('formatXml()', function () {
          {$: {baz: 'plip'}}
        ]
      }
-    })).to.equal(`<foo>
+    })).toBe(`<foo>
  <bar baz="plop"/>
  <bar baz="plip"/>
 </foo>`)
@@ -114,7 +123,7 @@ describe('formatXml()', function () {

 describe('generateToken()', () => {
  it('generates a string', async () => {
-    expect(await generateToken()).to.be.a.string()
+    expect(typeof await generateToken()).toBe('string')
  })
 })

@@ -122,21 +131,21 @@ describe('generateToken()', () => {

 describe('parseSize()', function () {
  it('parses a human size', function () {
-    expect(parseSize('1G')).to.equal(1e9)
+    expect(parseSize('1G')).toBe(1e9)
  })

  it('returns the parameter if already a number', function () {
-    expect(parseSize(1e6)).to.equal(1e6)
+    expect(parseSize(1e6)).toBe(1e6)
  })

  it('throws if the string cannot be parsed', function () {
    expect(function () {
      parseSize('foo')
-    }).to.throw()
+    }).toThrow()
  })

  it('supports the B unit as suffix', function () {
-    expect(parseSize('3MB')).to.equal(3e6)
+    expect(parseSize('3MB')).toBe(3e6)
  })
 })

@@ -144,6 +153,7 @@ describe('parseSize()', function () {

 describe('pSettle()', () => {
  it('works with arrays', async () => {
+    const rejection = 'fatality'
    const [
      status1,
      status2,
@@ -151,27 +161,29 @@ describe('pSettle()', () => {
    ] = await pSettle([
      Promise.resolve(42),
      Math.PI,
-      Promise.reject('fatality')
+      Promise.reject(rejection)
    ])

-    expect(status1.isRejected()).to.equal(false)
-    expect(status2.isRejected()).to.equal(false)
-    expect(status3.isRejected()).to.equal(true)
+    expect(status1.isRejected()).toBe(false)
+    expect(status2.isRejected()).toBe(false)
+    expect(status3.isRejected()).toBe(true)

-    expect(status1.isFulfilled()).to.equal(true)
-    expect(status2.isFulfilled()).to.equal(true)
-    expect(status3.isFulfilled()).to.equal(false)
+    expect(status1.isFulfilled()).toBe(true)
+    expect(status2.isFulfilled()).toBe(true)
+    expect(status3.isFulfilled()).toBe(false)

-    expect(status1.value()).to.equal(42)
-    expect(status2.value()).to.equal(Math.PI)
-    expect(::status3.value).to.throw()
+    expect(status1.value()).toBe(42)
+    expect(status2.value()).toBe(Math.PI)
+    expect(::status3.value).toThrow()

-    expect(::status1.reason).to.throw()
-    expect(::status2.reason).to.throw()
-    expect(status3.reason()).to.equal('fatality')
+    expect(::status1.reason).toThrow()
+    expect(::status2.reason).toThrow()
+    expect(status3.reason()).toBe(rejection)
  })

  it('works with objects', async () => {
+    const rejection = 'fatality'
+
    const {
      a: status1,
      b: status2,
@@ -179,23 +191,23 @@ describe('pSettle()', () => {
    } = await pSettle({
      a: Promise.resolve(42),
      b: Math.PI,
-      c: Promise.reject('fatality')
+      c: Promise.reject(rejection)
    })

-    expect(status1.isRejected()).to.equal(false)
-    expect(status2.isRejected()).to.equal(false)
-    expect(status3.isRejected()).to.equal(true)
+    expect(status1.isRejected()).toBe(false)
+    expect(status2.isRejected()).toBe(false)
+    expect(status3.isRejected()).toBe(true)

-    expect(status1.isFulfilled()).to.equal(true)
-    expect(status2.isFulfilled()).to.equal(true)
-    expect(status3.isFulfilled()).to.equal(false)
+    expect(status1.isFulfilled()).toBe(true)
+    expect(status2.isFulfilled()).toBe(true)
+    expect(status3.isFulfilled()).toBe(false)

-    expect(status1.value()).to.equal(42)
-    expect(status2.value()).to.equal(Math.PI)
-    expect(::status3.value).to.throw()
+    expect(status1.value()).toBe(42)
+    expect(status2.value()).toBe(Math.PI)
+    expect(::status3.value).toThrow()

-    expect(::status1.reason).to.throw()
-    expect(::status2.reason).to.throw()
-    expect(status3.reason()).to.equal('fatality')
+    expect(::status1.reason).toThrow()
+    expect(::status2.reason).toThrow()
+    expect(status3.reason()).toBe(rejection)
  })
 })
--- a/src/vhd-merge.js
+++ b/src/vhd-merge.js
@@ -1,4 +1,10 @@
-import fu from 'struct-fu'
+// TODO: remove once completely merged in vhd.js
+
+import assert from 'assert'
+import constantStream from 'constant-stream'
+import eventToPromise from 'event-to-promise'
+import fu from '@nraynaud/struct-fu'
+import isEqual from 'lodash/isEqual'

 import {
  noop,
@@ -39,6 +45,10 @@ const HARD_DISK_TYPE_DIFFERENCING = 4 // Delta backup.
 const BLOCK_UNUSED = 0xFFFFFFFF
 const BIT_MASK = 0x80

+// unused block as buffer containing a uint32BE
+const BUF_BLOCK_UNUSED = Buffer.allocUnsafe(VHD_ENTRY_SIZE)
+BUF_BLOCK_UNUSED.writeUInt32BE(BLOCK_UNUSED, 0)
+
 // ===================================================================

 const fuFooter = fu.struct([
@@ -91,7 +101,7 @@ const fuHeader = fu.struct([
  fu.uint8('parentUuid', 16),
  fu.uint32('parentTimestamp'),
  fu.uint32('reserved1'),
-  fu.char('parentUnicodeName', 512),
+  fu.char16be('parentUnicodeName', 512),
  fu.struct('parentLocatorEntry', [
    fu.uint32('platformCode'),
    fu.uint32('platformDataSpace'),
@@ -144,40 +154,28 @@ const unpackField = (field, buf) => {
 }
 // ===================================================================

-// Returns the checksum of a raw footer.
-// The raw footer is altered with the new sum.
-function checksumFooter (rawFooter) {
-  const checksumField = fuFooter.fields.checksum
+// Returns the checksum of a raw struct.
+// The raw struct (footer or header) is altered with the new sum.
+function checksumStruct (rawStruct, struct) {
+  const checksumField = struct.fields.checksum

  let sum = 0

  // Reset current sum.
-  packField(checksumField, 0, rawFooter)
+  packField(checksumField, 0, rawStruct)

-  for (let i = 0; i < VHD_FOOTER_SIZE; i++) {
-    sum = (sum + rawFooter[i]) & 0xFFFFFFFF
+  for (let i = 0, n = struct.size; i < n; i++) {
+    sum = (sum + rawStruct[i]) & 0xFFFFFFFF
  }

  sum = 0xFFFFFFFF - sum

  // Write new sum.
-  packField(checksumField, sum, rawFooter)
+  packField(checksumField, sum, rawStruct)

  return sum
 }

-function getParentLocatorSize (parentLocatorEntry) {
-  const { platformDataSpace } = parentLocatorEntry
-
-  if (platformDataSpace < VHD_SECTOR_SIZE) {
-    return sectorsToBytes(platformDataSpace)
-  }
-
-  return (platformDataSpace % VHD_SECTOR_SIZE === 0)
-    ? platformDataSpace
-    : 0
-}
-
 // ===================================================================

 class Vhd {
@@ -190,6 +188,17 @@ class Vhd {
  // Read functions.
  // =================================================================

+  _readStream (start, n) {
+    return this._handler.createReadStream(this._path, {
+      start,
+      end: start + n - 1 // end is inclusive
+    })
+  }
+
+  _read (start, n) {
+    return this._readStream(start, n).then(streamToBuffer)
+  }
+
  // Returns the first address after metadata. (In bytes)
  getEndOfHeaders () {
    const { header } = this
@@ -207,10 +216,10 @@ class Vhd {
      const entry = header.parentLocatorEntry[i]

      if (entry.platformCode !== VHD_PLATFORM_CODE_NONE) {
-        const dataOffset = uint32ToUint64(entry.platformDataOffset)
-
-        // Max(end, locator end)
-        end = Math.max(end, dataOffset + getParentLocatorSize(entry))
+        end = Math.max(end,
+          uint32ToUint64(entry.platformDataOffset) +
+          sectorsToBytes(entry.platformDataSpace)
+        )
      }
    }

@@ -221,17 +230,15 @@ class Vhd {

  // Returns the first sector after data.
  getEndOfData () {
-    let end = Math.floor(this.getEndOfHeaders() / VHD_SECTOR_SIZE)
+    let end = Math.ceil(this.getEndOfHeaders() / VHD_SECTOR_SIZE)

+    const fullBlockSize = this.sectorsOfBitmap + this.sectorsPerBlock
    const { maxTableEntries } = this.header
    for (let i = 0; i < maxTableEntries; i++) {
-      let blockAddr = this.readAllocationTableEntry(i)
+      const blockAddr = this._getBatEntry(i)

      if (blockAddr !== BLOCK_UNUSED) {
-        // Compute next block address.
-        blockAddr += this.sectorsPerBlock + this.sectorsOfBitmap
-
-        end = Math.max(end, blockAddr)
+        end = Math.max(end, blockAddr + fullBlockSize)
      }
    }

@@ -240,24 +247,12 @@ class Vhd {
    return sectorsToBytes(end)
  }

-  // Returns the start position of the vhd footer.
-  // The real footer, not the copy at the beginning of the vhd file.
-  async getFooterStart () {
-    const stats = await this._handler.getSize(this._path)
-    return stats.size - VHD_FOOTER_SIZE
-  }
-
  // Get the beginning (footer + header) of a vhd file.
  async readHeaderAndFooter () {
-    const buf = await streamToBuffer(
-      await this._handler.createReadStream(this._path, {
-        start: 0,
-        end: VHD_FOOTER_SIZE + VHD_HEADER_SIZE - 1
-      })
-    )
+    const buf = await this._read(0, VHD_FOOTER_SIZE + VHD_HEADER_SIZE)

    const sum = unpackField(fuFooter.fields.checksum, buf)
-    const sumToTest = checksumFooter(buf)
+    const sumToTest = checksumStruct(buf, fuFooter)

    // Checksum child & parent.
    if (sumToTest !== sum) {
@@ -297,119 +292,176 @@ class Vhd {
      sectorsRoundUpNoZero(header.maxTableEntries * VHD_ENTRY_SIZE)
    )

-    this.blockTable = await streamToBuffer(
-      await this._handler.createReadStream(this._path, {
-        start: offset,
-        end: offset + size - 1
-      })
-    )
+    this.blockTable = await this._read(offset, size)
  }

-  // Returns the address block at the entry location of one table.
-  readAllocationTableEntry (entry) {
-    return this.blockTable.readUInt32BE(entry * VHD_ENTRY_SIZE)
+  // return the first sector (bitmap) of a block
+  _getBatEntry (block) {
+    return this.blockTable.readUInt32BE(block * VHD_ENTRY_SIZE)
  }

-  // Returns the data content of a block. (Not the bitmap !)
-  async readBlockData (blockAddr) {
-    const { blockSize } = this.header
-
-    const handler = this._handler
-    const path = this._path
-
-    const blockDataAddr = sectorsToBytes(blockAddr + this.sectorsOfBitmap)
-    const footerStart = await this.getFooterStart()
-    const isPadded = footerStart < (blockDataAddr + blockSize)
-
-    // Size ot the current block in the vhd file.
-    const size = isPadded ? (footerStart - blockDataAddr) : sectorsToBytes(this.sectorsPerBlock)
-
-    debug(`Read block data at: ${blockDataAddr}. (size=${size})`)
-
-    const buf = await streamToBuffer(
-      await handler.createReadStream(path, {
-        start: blockDataAddr,
-        end: blockDataAddr + size - 1
-      })
-    )
-
-    // Padded by zero !
-    if (isPadded) {
-      return Buffer.concat([buf, new Buffer(blockSize - size).fill(0)])
+  _readBlock (blockId, onlyBitmap = false) {
+    const blockAddr = this._getBatEntry(blockId)
+    if (blockAddr === BLOCK_UNUSED) {
+      throw new Error(`no such block ${blockId}`)
    }

-    return buf
+    return this._read(
+      sectorsToBytes(blockAddr),
+      onlyBitmap ? this.bitmapSize : this.fullBlockSize
+    ).then(buf => onlyBitmap
+      ? { bitmap: buf }
+      : {
+        bitmap: buf.slice(0, this.bitmapSize),
+        data: buf.slice(this.bitmapSize)
+      }
+    )
  }

-  // Returns a buffer that contains the bitmap of a block.
+  // get the identifiers and first sectors of the first and last block
+  // in the file
  //
-  // TODO: merge with readBlockData().
-  async readBlockBitmap (blockAddr) {
-    const { bitmapSize } = this
-    const offset = sectorsToBytes(blockAddr)
+  // return undefined if none
+  _getFirstAndLastBlocks () {
+    const n = this.header.maxTableEntries
+    const bat = this.blockTable
+    let i = 0
+    let j = 0
+    let first, firstSector, last, lastSector

-    debug(`Read bitmap at: ${offset}. (size=${bitmapSize})`)
+    // get first allocated block for initialization
+    while ((firstSector = bat.readUInt32BE(j)) === BLOCK_UNUSED) {
+      i += 1
+      j += VHD_ENTRY_SIZE

-    return streamToBuffer(
-      await this._handler.createReadStream(this._path, {
-        start: offset,
-        end: offset + bitmapSize - 1
-      })
-    )
+      if (i === n) {
+        return
+      }
+    }
+    lastSector = firstSector
+    first = last = i
+
+    while (i < n) {
+      const sector = bat.readUInt32BE(j)
+      if (sector !== BLOCK_UNUSED) {
+        if (sector < firstSector) {
+          first = i
+          firstSector = sector
+        } else if (sector > lastSector) {
+          last = i
+          lastSector = sector
+        }
+      }
+
+      i += 1
+      j += VHD_ENTRY_SIZE
+    }
+
+    return { first, firstSector, last, lastSector }
  }

  // =================================================================
  // Write functions.
  // =================================================================

-  // Write a buffer at a given position in a vhd file.
-  async _write (buffer, offset) {
+  // Write a buffer/stream at a given position in a vhd file.
+  _write (data, offset) {
+    debug(`_write offset=${offset} size=${Buffer.isBuffer(data) ? data.length : '???'}`)
    // TODO: could probably be merged in remote handlers.
    return this._handler.createOutputStream(this._path, {
-      start: offset,
-      flags: 'r+'
-    }).then(stream => new Promise((resolve, reject) => {
-      stream.on('error', reject)
-      stream.write(buffer, () => {
-        stream.end()
-        resolve()
-      })
-    }))
+      flags: 'r+',
+      start: offset
+    }).then(
+      Buffer.isBuffer(data)
+        ? stream => new Promise((resolve, reject) => {
+          stream.on('error', reject)
+          stream.end(data, resolve)
+        })
+        : stream => eventToPromise(data.pipe(stream), 'finish')
+    )
  }

-  // Write an entry in the allocation table.
-  writeAllocationTableEntry (entry, value) {
-    this.blockTable.writeUInt32BE(value, entry * VHD_ENTRY_SIZE)
+  async ensureBatSize (size) {
+    const { header } = this
+
+    const prevMaxTableEntries = header.maxTableEntries
+    if (prevMaxTableEntries >= size) {
+      return
+    }
+
+    const tableOffset = uint32ToUint64(header.tableOffset)
+    const { first, firstSector, lastSector } = this._getFirstAndLastBlocks()
+
+    // extend BAT
+    const maxTableEntries = header.maxTableEntries = size
+    const batSize = maxTableEntries * VHD_ENTRY_SIZE
+    const prevBat = this.blockTable
+    const bat = this.blockTable = Buffer.allocUnsafe(batSize)
+    prevBat.copy(bat)
+    bat.fill(BUF_BLOCK_UNUSED, prevBat.length)
+    debug(`ensureBatSize: extend in memory BAT ${prevMaxTableEntries} -> ${maxTableEntries}`)
+
+    const extendBat = () => {
+      debug(`ensureBatSize: extend in file BAT ${prevMaxTableEntries} -> ${maxTableEntries}`)
+
+      return this._write(
+        constantStream(BUF_BLOCK_UNUSED, maxTableEntries - prevMaxTableEntries),
+        tableOffset + prevBat.length
+      )
+    }
+
+    if (tableOffset + batSize < sectorsToBytes(firstSector)) {
+      return Promise.all([
+        extendBat(),
+        this.writeHeader()
+      ])
+    }
+
+    const { fullBlockSize } = this
+    const newFirstSector = lastSector + fullBlockSize / VHD_SECTOR_SIZE
+    debug(`ensureBatSize: move first block ${firstSector} -> ${newFirstSector}`)
+
+    return Promise.all([
+      // copy the first block at the end
+      this._readStream(sectorsToBytes(firstSector), fullBlockSize).then(stream =>
+        this._write(stream, sectorsToBytes(newFirstSector))
+      ).then(extendBat),
+
+      this._setBatEntry(first, newFirstSector),
+      this.writeHeader(),
+      this.writeFooter()
+    ])
+  }
+
+  // set the first sector (bitmap) of a block
+  _setBatEntry (block, blockSector) {
+    const i = block * VHD_ENTRY_SIZE
+    const { blockTable } = this
+
+    blockTable.writeUInt32BE(blockSector, i)
+
+    return this._write(
+      blockTable.slice(i, i + VHD_ENTRY_SIZE),
+      uint32ToUint64(this.header.tableOffset) + i
+    )
  }

  // Make a new empty block at vhd end.
  // Update block allocation table in context and in file.
  async createBlock (blockId) {
-    // End of file !
-    let offset = this.getEndOfData()
+    const blockAddr = Math.ceil(this.getEndOfData() / VHD_SECTOR_SIZE)

-    // Padded on bound sector.
-    if (offset % VHD_SECTOR_SIZE) {
-      offset += (VHD_SECTOR_SIZE - (offset % VHD_SECTOR_SIZE))
-    }
+    debug(`create block ${blockId} at ${blockAddr}`)

-    const blockAddr = Math.floor(offset / VHD_SECTOR_SIZE)
+    await Promise.all([
+      // Write an empty block and addr in vhd file.
+      this._write(
+        constantStream([ 0 ], this.fullBlockSize),
+        sectorsToBytes(blockAddr)
+      ),

-    const {
-      blockTable,
-      fullBlockSize
-    } = this
-    debug(`Create block at ${blockAddr}. (size=${fullBlockSize}, offset=${offset})`)
-
-    // New entry in block allocation table.
-    this.writeAllocationTableEntry(blockId, blockAddr)
-
-    const tableOffset = uint32ToUint64(this.header.tableOffset)
-    const entry = blockId * VHD_ENTRY_SIZE
-
-    // Write an empty block and addr in vhd file.
-    await this._write(new Buffer(fullBlockSize).fill(0), offset)
-    await this._write(blockTable.slice(entry, entry + VHD_ENTRY_SIZE), tableOffset + entry)
+      this._setBatEntry(blockId, blockAddr)
+    ])

    return blockAddr
  }
@@ -428,17 +480,16 @@ class Vhd {
    await this._write(bitmap, sectorsToBytes(blockAddr))
  }

-  async writeBlockSectors (block, beginSectorId, n) {
-    let blockAddr = this.readAllocationTableEntry(block.id)
+  async writeBlockSectors (block, beginSectorId, endSectorId) {
+    let blockAddr = this._getBatEntry(block.id)

    if (blockAddr === BLOCK_UNUSED) {
      blockAddr = await this.createBlock(block.id)
    }

-    const endSectorId = beginSectorId + n
    const offset = blockAddr + this.sectorsOfBitmap + beginSectorId

-    debug(`Write block data at: ${offset}. (counter=${n}, blockId=${block.id}, blockSector=${beginSectorId})`)
+    debug(`writeBlockSectors at ${offset} block=${block.id}, sectors=${beginSectorId}...${endSectorId}`)

    await this._write(
      block.data.slice(
@@ -448,7 +499,7 @@ class Vhd {
      sectorsToBytes(offset)
    )

-    const bitmap = await this.readBlockBitmap(this.bitmapSize, blockAddr)
+    const { bitmap } = await this._readBlock(block.id, true)

    for (let i = beginSectorId; i < endSectorId; ++i) {
      mapSetBit(bitmap, i)
@@ -458,61 +509,69 @@ class Vhd {
  }

  // Merge block id (of vhd child) into vhd parent.
-  async coalesceBlock (child, blockAddr, blockId) {
+  async coalesceBlock (child, blockId) {
    // Get block data and bitmap of block id.
-    const blockData = await child.readBlockData(blockAddr)
-    const blockBitmap = await child.readBlockBitmap(blockAddr)
+    const { bitmap, data } = await child._readBlock(blockId)

-    debug(`Coalesce block ${blockId} at ${blockAddr}.`)
+    debug(`coalesceBlock block=${blockId}`)

    // For each sector of block data...
    const { sectorsPerBlock } = child
    for (let i = 0; i < sectorsPerBlock; i++) {
      // If no changes on one sector, skip.
-      if (!mapTestBit(blockBitmap, i)) {
+      if (!mapTestBit(bitmap, i)) {
        continue
      }

-      let sectors = 0
+      let endSector = i + 1

      // Count changed sectors.
-      for (; sectors + i < sectorsPerBlock; sectors++) {
-        if (!mapTestBit(blockBitmap, sectors + i)) {
-          break
-        }
+      while (endSector < sectorsPerBlock && mapTestBit(bitmap, endSector)) {
+        ++endSector
      }

      // Write n sectors into parent.
-      debug(`Coalesce block: write. (offset=${i}, sectors=${sectors})`)
+      debug(`coalesceBlock: write sectors=${i}...${endSector}`)
      await this.writeBlockSectors(
-        { id: blockId, data: blockData },
+        { id: blockId, data },
        i,
-        sectors
+        endSector
      )

-      i += sectors
+      i = endSector
    }
  }

-  // Write a context footer. (At the end and beggining of a vhd file.)
+  // Write a context footer. (At the end and beginning of a vhd file.)
  async writeFooter () {
    const { footer } = this

    const offset = this.getEndOfData()
    const rawFooter = fuFooter.pack(footer)

-    footer.checksum = checksumFooter(rawFooter)
+    footer.checksum = checksumStruct(rawFooter, fuFooter)
    debug(`Write footer at: ${offset} (checksum=${footer.checksum}). (data=${rawFooter.toString('hex')})`)

    await this._write(rawFooter, 0)
    await this._write(rawFooter, offset)
  }
+
+  writeHeader () {
+    const { header } = this
+    const rawHeader = fuHeader.pack(header)
+    header.checksum = checksumStruct(rawHeader, fuHeader)
+    const offset = VHD_FOOTER_SIZE
+    debug(`Write header at: ${offset} (checksum=${header.checksum}). (data=${rawHeader.toString('hex')})`)
+    return this._write(rawHeader, offset)
+  }
 }

 // Merge vhd child into vhd parent.
 //
 // Child must be a delta backup !
 // Parent must be a full backup !
+//
+// TODO: update the identifier of the parent VHD.
 export default async function vhdMerge (
  parentHandler, parentPath,
  childHandler, childPath
@@ -526,6 +585,8 @@ export default async function vhdMerge (
    childVhd.readHeaderAndFooter()
  ])

+  assert(childVhd.header.blockSize === parentVhd.header.blockSize)
+
  // Child must be a delta.
  if (childVhd.footer.diskType !== HARD_DISK_TYPE_DIFFERENCING) {
    throw new Error('Unable to merge, child is not a delta backup.')
@@ -550,17 +611,66 @@ export default async function vhdMerge (
    childVhd.readBlockTable()
  ])

-  for (let blockId = 0; blockId < childVhd.header.maxTableEntries; blockId++) {
-    const blockAddr = childVhd.readAllocationTableEntry(blockId)
+  await parentVhd.ensureBatSize(childVhd.header.maxTableEntries)

-    if (blockAddr !== BLOCK_UNUSED) {
-      await parentVhd.coalesceBlock(
-        childVhd,
-        blockAddr,
-        blockId
-      )
+  for (let blockId = 0; blockId < childVhd.header.maxTableEntries; blockId++) {
+    if (childVhd._getBatEntry(blockId) !== BLOCK_UNUSED) {
+      await parentVhd.coalesceBlock(childVhd, blockId)
    }
  }

+  const cFooter = childVhd.footer
+  const pFooter = parentVhd.footer
+
+  pFooter.currentSize = { ...cFooter.currentSize }
+  pFooter.diskGeometry = { ...cFooter.diskGeometry }
+  pFooter.originalSize = { ...cFooter.originalSize }
+  pFooter.timestamp = cFooter.timestamp
+
+  // necessary to update values and to recreate the footer after block
+  // creation
  await parentVhd.writeFooter()
 }
+
+// returns true if the child was actually modified
+export async function chainVhd (
+  parentHandler, parentPath,
+  childHandler, childPath
+) {
+  const parentVhd = new Vhd(parentHandler, parentPath)
+  const childVhd = new Vhd(childHandler, childPath)
+  await Promise.all([
+    parentVhd.readHeaderAndFooter(),
+    childVhd.readHeaderAndFooter()
+  ])
+
+  const { header } = childVhd
+
+  const parentName = parentPath.split('/').pop()
+  const parentUuid = parentVhd.footer.uuid
+  if (
+    header.parentUnicodeName !== parentName ||
+    !isEqual(header.parentUuid, parentUuid)
+  ) {
+    header.parentUuid = parentUuid
+    header.parentUnicodeName = parentName
+    await childVhd.writeHeader()
+    return true
+  }
+
+  // The checksum was broken between xo-server v5.2.4 and v5.2.5
+  //
+  // Replace by a correct checksum if necessary.
+  //
+  // TODO: remove when enough time as passed (6 months).
+  {
+    const rawHeader = fuHeader.pack(header)
+    const checksum = checksumStruct(rawHeader, fuHeader)
+    if (checksum !== header.checksum) {
+      await childVhd._write(rawHeader, VHD_FOOTER_SIZE)
+      return true
+    }
+  }
+
+  return false
+}
--- a/src/xapi-object-to-xo.js
+++ b/src/xapi-object-to-xo.js
@@ -1,8 +1,14 @@
+import {
+  startsWith
+} from 'lodash'
+
 import {
  ensureArray,
  extractProperty,
  forEach,
  isArray,
+  isEmpty,
+  mapFilter,
  mapToArray,
  parseXml
 } from './utils'
@@ -12,6 +18,9 @@ import {
  isVmRunning,
  parseDateTime
 } from './xapi'
+import {
+  useUpdateSystem
+} from './xapi/utils'

 // ===================================================================

@@ -93,6 +102,32 @@ const TRANSFORMS = {
    } = obj

    const isRunning = isHostRunning(obj)
+    const { software_version } = obj
+    let supplementalPacks, patches
+
+    if (useUpdateSystem(obj)) {
+      supplementalPacks = []
+      patches = []
+
+      forEach(obj.$updates, update => {
+        const formattedUpdate = {
+          name: update.name_label,
+          description: update.name_description,
+          author: update.key.split('-')[3],
+          version: update.version,
+          guidance: update.after_apply_guidance,
+          hosts: link(update, 'hosts'),
+          vdi: link(update, 'vdi'),
+          size: update.installation_size
+        }
+
+        if (startsWith(update.name_label, 'XS')) {
+          patches.push(formattedUpdate)
+        } else {
+          supplementalPacks.push(formattedUpdate)
+        }
+      })
+    }

    return {
      // Deprecated
@@ -133,12 +168,25 @@ const TRANSFORMS = {
          total: 0
        }
      })(),
-      patches: link(obj, 'patches'),
+      patches: patches || link(obj, 'patches'),
      powerOnMode: obj.power_on_mode,
      power_state: metrics
        ? (isRunning ? 'Running' : 'Halted')
        : 'Unknown',
      startTime: toTimestamp(otherConfig.boot_time),
+      supplementalPacks: supplementalPacks ||
+        mapFilter(software_version, (value, key) => {
+          let author, name
+          if (([ author, name ] = key.split(':')).length === 2) {
+            const [ description, version ] = value.split(', ')
+            return {
+              name,
+              description,
+              author,
+              version: version.split(' ')[1]
+            }
+          }
+        }),
      agentStartTime: toTimestamp(otherConfig.agent_start_time),
      tags: obj.tags,
      version: obj.software_version.product_version,
@@ -184,22 +232,33 @@ const TRANSFORMS = {
        return false
      }

-      const { PV_drivers_version: { major, minor } } = guestMetrics
-      if (major === undefined || minor === undefined) {
-        return false
-      }
+      const { major, minor } = guestMetrics.PV_drivers_version
+      const [ hostMajor, hostMinor ] = (obj.$resident_on || obj.$pool.$master)
+        .software_version
+        .product_version
+        .split('.')

-      return guestMetrics.PV_drivers_up_to_date
+      return major >= hostMajor && minor >= hostMinor
        ? 'up to date'
        : 'out of date'
    })()

+    let resourceSet = otherConfig['xo:resource_set']
+    if (resourceSet) {
+      try {
+        resourceSet = JSON.parse(resourceSet)
+      } catch (_) {
+        resourceSet = undefined
+      }
+    }
+
    const vm = {
      // type is redefined after for controllers/, templates &
      // snapshots.
      type: 'VM',

-      addresses: guestMetrics && guestMetrics.networks || null,
+      addresses: (guestMetrics && guestMetrics.networks) || null,
+      affinityHost: link(obj, 'affinity'),
      auto_poweron: Boolean(otherConfig.auto_poweron),
      boot: obj.HVM_boot_params,
      CPUs: {
@@ -232,7 +291,8 @@ const TRANSFORMS = {
        return {
          enabled: true,
          info: info && parseXml(info).docker_info,
-          process: process && parseXml(process).docker_ps,
+          containers: ensureArray(process && parseXml(process).docker_ps.item),
+          process: process && parseXml(process).docker_ps, // deprecated (only used in v4)
          version: version && parseXml(version).docker_version
        }
      })(),
@@ -266,11 +326,13 @@ const TRANSFORMS = {

        return memory
      })(),
+      installTime: metrics && toTimestamp(metrics.install_time),
      name_description: obj.name_description,
      name_label: obj.name_label,
      other: otherConfig,
-      os_version: guestMetrics && guestMetrics.os_version || null,
+      os_version: (guestMetrics && guestMetrics.os_version) || null,
      power_state: obj.power_state,
+      resourceSet,
      snapshots: link(obj, 'snapshots'),
      startTime: metrics && toTimestamp(metrics.start_time),
      tags: obj.tags,
@@ -307,6 +369,10 @@ const TRANSFORMS = {
    } else if (obj.is_a_template) {
      vm.type += '-template'

+      if (obj.other_config.default_template === 'true') {
+        vm.id = obj.$ref // use refs for templates as they
+      }
+
      vm.CPUs.number = +obj.VCPUs_at_startup
      vm.template_info = {
        arch: otherConfig['install-arch'],
@@ -362,10 +428,13 @@ const TRANSFORMS = {
      name_description: obj.name_description,
      name_label: obj.name_label,
      size: +obj.physical_size,
+      shared: Boolean(obj.shared),
      SR_type: obj.type,
      tags: obj.tags,
      usage: +obj.virtual_allocation,
      VDIs: link(obj, 'VDIs'),
+      other_config: obj.other_config,
+      sm_config: obj.sm_config,

      $container: (
        obj.shared || !obj.$PBDs[0]
@@ -382,26 +451,32 @@ const TRANSFORMS = {
    return {
      type: 'PBD',

-      attached: obj.currently_attached,
+      attached: Boolean(obj.currently_attached),
      host: link(obj, 'host'),
-      SR: link(obj, 'SR')
+      SR: link(obj, 'SR'),
+      device_config: obj.device_config
    }
  },

  // -----------------------------------------------------------------

  pif (obj) {
+    const metrics = obj.$metrics
+
    return {
      type: 'PIF',

      attached: Boolean(obj.currently_attached),
+      isBondMaster: !isEmpty(obj.bond_master_of),
      device: obj.device,
+      deviceName: metrics && metrics.device_name,
      dns: obj.DNS,
      disallowUnplug: Boolean(obj.disallow_unplug),
      gateway: obj.gateway,
      ip: obj.IP,
      mac: obj.MAC,
      management: Boolean(obj.management), // TODO: find a better name.
+      carrier: Boolean(metrics && metrics.carrier),
      mode: obj.ip_configuration_mode,
      mtu: +obj.MTU,
      netmask: obj.netmask,
@@ -452,6 +527,7 @@ const TRANSFORMS = {

      attached: Boolean(obj.currently_attached),
      bootable: Boolean(obj.bootable),
+      device: obj.device || null,
      is_cd_drive: obj.type === 'CD',
      position: obj.userdevice,
      read_only: obj.mode === 'RO',
@@ -483,9 +559,11 @@ const TRANSFORMS = {
  network (obj) {
    return {
      bridge: obj.bridge,
+      defaultIsLocked: obj.default_locking_mode === 'disabled',
      MTU: +obj.MTU,
      name_description: obj.name_description,
      name_label: obj.name_label,
+      other_config: obj.other_config,
      tags: obj.tags,
      PIFs: link(obj, 'PIFs'),
      VIFs: link(obj, 'VIFs')
--- a/src/xapi/index.js
+++ b/src/xapi/index.js
--- a/src/xapi/mixins/.index-modules
+++ b/src/xapi/mixins/.index-modules
--- a/src/xapi/mixins/networking.js
+++ b/src/xapi/mixins/networking.js
@@ -1,10 +1,60 @@
-import {
-  makeEditObject
-} from '../utils'
+import { isEmpty } from '../../utils'
+
+import { makeEditObject } from '../utils'

 export default {
+  async _connectVif (vif) {
+    await this.call('VIF.plug', vif.$ref)
+  },
+  async connectVif (vifId) {
+    await this._connectVif(this.getObject(vifId))
+  },
+  async _deleteVif (vif) {
+    await this.call('VIF.destroy', vif.$ref)
+  },
+  async deleteVif (vifId) {
+    const vif = this.getObject(vifId)
+    if (vif.currently_attached) {
+      await this._disconnectVif(vif)
+    }
+    await this._deleteVif(vif)
+  },
+  async _disconnectVif (vif) {
+    await this.call('VIF.unplug_force', vif.$ref)
+  },
+  async disconnectVif (vifId) {
+    await this._disconnectVif(this.getObject(vifId))
+  },
  editVif: makeEditObject({
-    ipv4Allowed: true,
-    ipv6Allowed: true
+    ipv4Allowed: {
+      get: true,
+      set: [
+        'ipv4Allowed',
+        function (value, vif) {
+          const lockingMode = isEmpty(value) && isEmpty(vif.ipv6_allowed)
+            ? 'network_default'
+            : 'locked'
+
+          if (lockingMode !== vif.locking_mode) {
+            return this._set('locking_mode', lockingMode)
+          }
+        }
+      ]
+    },
+    ipv6Allowed: {
+      get: true,
+      set: [
+        'ipv6Allowed',
+        function (value, vif) {
+          const lockingMode = isEmpty(value) && isEmpty(vif.ipv4_allowed)
+            ? 'network_default'
+            : 'locked'
+
+          if (lockingMode !== vif.locking_mode) {
+            return this._set('locking_mode', lockingMode)
+          }
+        }
+      ]
+    }
  })
 }
--- a/src/xapi/mixins/patching.js
+++ b/src/xapi/mixins/patching.js
@@ -0,0 +1,380 @@
+import deferrable from 'golike-defer'
+import filter from 'lodash/filter'
+import includes from 'lodash/includes'
+import some from 'lodash/some'
+import sortBy from 'lodash/sortBy'
+import unzip from 'julien-f-unzip'
+
+import httpProxy from '../../http-proxy'
+import httpRequest from '../../http-request'
+import { debounce } from '../../decorators'
+import {
+  createRawObject,
+  ensureArray,
+  forEach,
+  mapFilter,
+  mapToArray,
+  parseXml
+} from '../../utils'
+
+import {
+  debug,
+  put,
+  useUpdateSystem
+} from '../utils'
+
+export default {
+  // FIXME: should be static
+  @debounce(24 * 60 * 60 * 1000)
+  async _getXenUpdates () {
+    const { readAll, statusCode } = await httpRequest(
+      'http://updates.xensource.com/XenServer/updates.xml',
+      { agent: httpProxy }
+    )
+
+    if (statusCode !== 200) {
+      throw new Error('cannot fetch patches list from Citrix')
+    }
+
+    const data = parseXml(await readAll()).patchdata
+
+    const patches = createRawObject()
+    forEach(data.patches.patch, patch => {
+      patches[patch.uuid] = {
+        date: patch.timestamp,
+        description: patch['name-description'],
+        documentationUrl: patch.url,
+        guidance: patch['after-apply-guidance'],
+        name: patch['name-label'],
+        url: patch['patch-url'],
+        uuid: patch.uuid,
+        conflicts: mapToArray(ensureArray(patch.conflictingpatches), patch => {
+          return patch.conflictingpatch.uuid
+        }),
+        requirements: mapToArray(ensureArray(patch.requiredpatches), patch => {
+          return patch.requiredpatch.uuid
+        })
+        // TODO: what does it mean, should we handle it?
+        // version: patch.version,
+      }
+      if (patches[patch.uuid].conflicts[0] === undefined) {
+        patches[patch.uuid].conflicts.length = 0
+      }
+      if (patches[patch.uuid].requirements[0] === undefined) {
+        patches[patch.uuid].requirements.length = 0
+      }
+    })
+
+    const resolveVersionPatches = function (uuids) {
+      const versionPatches = createRawObject()
+
+      forEach(ensureArray(uuids), ({uuid}) => {
+        versionPatches[uuid] = patches[uuid]
+      })
+
+      return versionPatches
+    }
+
+    const versions = createRawObject()
+    let latestVersion
+    forEach(data.serverversions.version, version => {
+      versions[version.value] = {
+        date: version.timestamp,
+        name: version.name,
+        id: version.value,
+        documentationUrl: version.url,
+        patches: resolveVersionPatches(version.patch)
+      }
+
+      if (version.latest) {
+        latestVersion = versions[version.value]
+      }
+    })
+
+    return {
+      patches,
+      latestVersion,
+      versions
+    }
+  },
+
+  // =================================================================
+
+  // Returns installed and not installed patches for a given host.
+  async _getPoolPatchesForHost (host) {
+    const versions = (await this._getXenUpdates()).versions
+
+    const hostVersions = host.software_version
+    const version =
+      versions[hostVersions.product_version] ||
+      versions[hostVersions.product_version_text]
+
+    return version
+      ? version.patches
+      : []
+  },
+
+  _getInstalledPoolPatchesOnHost (host) {
+    const installed = createRawObject()
+
+    // platform_version < 2.1.1
+    forEach(host.$patches, hostPatch => {
+      installed[hostPatch.$pool_patch.uuid] = true
+    })
+
+    // platform_version >= 2.1.1
+    forEach(host.$updates, update => {
+      installed[update.uuid] = true // TODO: ignore packs
+    })
+
+    return installed
+  },
+
+  async _listMissingPoolPatchesOnHost (host) {
+    const all = await this._getPoolPatchesForHost(host)
+    const installed = this._getInstalledPoolPatchesOnHost(host)
+
+    const installable = createRawObject()
+    forEach(all, (patch, uuid) => {
+      if (installed[uuid]) {
+        return
+      }
+
+      for (const uuid of patch.conflicts) {
+        if (uuid in installed) {
+          return
+        }
+      }
+
+      installable[uuid] = patch
+    })
+
+    return installable
+  },
+
+  async listMissingPoolPatchesOnHost (hostId) {
+    // Returns an array to not break compatibility.
+    return mapToArray(
+      await this._listMissingPoolPatchesOnHost(this.getObject(hostId))
+    )
+  },
+
+  async _ejectToolsIsos (hostRef) {
+    return Promise.all(mapFilter(
+      this.objects.all,
+      vm => {
+        if (vm.$type !== 'vm' || (hostRef && vm.resident_on !== hostRef)) {
+          return
+        }
+
+        const shouldEjectCd = some(vm.$VBDs, vbd => {
+          const vdi = vbd.$VDI
+
+          return vdi && vdi.is_tools_iso
+        })
+
+        if (shouldEjectCd) {
+          return this.ejectCdFromVm(vm.$id)
+        }
+      }
+    ))
+  },
+
+  // -----------------------------------------------------------------
+
+  _isPoolPatchInstallableOnHost (patchUuid, host) {
+    const installed = this._getInstalledPoolPatchesOnHost(host)
+
+    if (installed[patchUuid]) {
+      return false
+    }
+
+    let installable = true
+
+    forEach(installed, patch => {
+      if (includes(patch.conflicts, patchUuid)) {
+        installable = false
+
+        return false
+      }
+    })
+
+    return installable
+  },
+
+  // -----------------------------------------------------------------
+
+  // platform_version < 2.1.1 ----------------------------------------
+  async uploadPoolPatch (stream, patchName = 'unknown') {
+    const taskRef = await this._createTask('Patch upload', patchName)
+
+    const task = this._watchTask(taskRef)
+    const [ patchRef ] = await Promise.all([
+      task,
+      put(stream, {
+        hostname: this.pool.$master.address,
+        path: '/pool_patch_upload',
+        protocol: 'https',
+        query: {
+          session_id: this.sessionId,
+          task_id: taskRef
+        },
+        rejectUnauthorized: false
+      }, task)
+    ])
+
+    return this._getOrWaitObject(patchRef)
+  },
+
+  async _getOrUploadPoolPatch (uuid) {
+    try {
+      return this.getObjectByUuid(uuid)
+    } catch (error) {}
+
+    debug('downloading patch %s', uuid)
+
+    const patchInfo = (await this._getXenUpdates()).patches[uuid]
+    if (!patchInfo) {
+      throw new Error('no such patch ' + uuid)
+    }
+
+    let stream = await httpRequest(patchInfo.url, { agent: httpProxy })
+    stream = await new Promise((resolve, reject) => {
+      const PATCH_RE = /\.xsupdate$/
+      stream.pipe(unzip.Parse()).on('entry', entry => {
+        if (PATCH_RE.test(entry.path)) {
+          entry.length = entry.size
+          resolve(entry)
+        } else {
+          entry.autodrain()
+        }
+      }).on('error', reject)
+    })
+
+    return this.uploadPoolPatch(stream, patchInfo.name)
+  },
+
+  // patform_version >= 2.1.1 ----------------------------------------
+  _installPatch: deferrable(async function ($defer, stream, { hostId }) {
+    if (!stream.length) {
+      throw new Error('stream must have a length')
+    }
+
+    const vdi = await this.createTemporaryVdiOnHost(stream, hostId, '[XO] Patch ISO', 'small temporary VDI to store a patch ISO')
+    $defer(() => this._deleteVdi(vdi))
+
+    const updateRef = await this.call('pool_update.introduce', vdi.$ref)
+    // TODO: check update status
+    // await this.call('pool_update.precheck', updateRef, host.$ref)
+    // - ok_livepatch_complete     An applicable live patch exists for every required component
+    // - ok_livepatch_incomplete   An applicable live patch exists but it is not sufficient
+    // - ok                        There is no applicable live patch
+    await this.call('pool_update.apply', updateRef, this.getObject(hostId).$ref)
+  }),
+
+  async _downloadPatchAndInstall (uuid, hostId) {
+    debug('downloading patch %s', uuid)
+
+    const patchInfo = (await this._getXenUpdates()).patches[uuid]
+    if (!patchInfo) {
+      throw new Error('no such patch ' + uuid)
+    }
+
+    let stream = await httpRequest(patchInfo.url, { agent: httpProxy })
+    stream = await new Promise((resolve, reject) => {
+      stream.pipe(unzip.Parse()).on('entry', entry => {
+        entry.length = entry.size
+        resolve(entry)
+      }).on('error', reject)
+    })
+
+    return this._installPatch(stream, { hostId })
+  },
+
+  // -----------------------------------------------------------------
+
+  async _installPoolPatchOnHost (patchUuid, host) {
+    const [ patch ] = await Promise.all([ this._getOrUploadPoolPatch(patchUuid), this._ejectToolsIsos(host.$ref) ])
+
+    await this.call('pool_patch.apply', patch.$ref, host.$ref)
+  },
+
+  _installPatchUpdateOnHost (patchUuid, host) {
+    return Promise.all([ this._downloadPatchAndInstall(patchUuid, host.$id), this._ejectToolsIsos(host.$ref) ])
+  },
+
+  async _checkSoftwareVersionAndInstallPatch (patchUuid, hostId) {
+    const host = this.getObject(hostId)
+
+    return useUpdateSystem(host)
+      ? this._installPatchUpdateOnHost(patchUuid, host)
+      : this._installPoolPatchOnHost(patchUuid, host)
+  },
+
+  async installPoolPatchOnHost (patchUuid, hostId) {
+    debug('installing patch %s', patchUuid)
+
+    return this._checkSoftwareVersionAndInstallPatch(patchUuid, hostId)
+  },
+
+  // -----------------------------------------------------------------
+
+  async installPoolPatchOnAllHosts (patchUuid) {
+    const [ patch ] = await Promise.all([ this._getOrUploadPoolPatch(patchUuid), this._ejectToolsIsos() ])
+
+    await this.call('pool_patch.pool_apply', patch.$ref)
+  },
+
+  // -----------------------------------------------------------------
+
+  async _installPoolPatchOnHostAndRequirements (patch, host, patchesByUuid) {
+    const { requirements } = patch
+    if (requirements.length) {
+      for (const requirementUuid of requirements) {
+        if (this._isPoolPatchInstallableOnHost(requirementUuid, host)) {
+          const requirement = patchesByUuid[requirementUuid]
+          await this._installPoolPatchOnHostAndRequirements(requirement, host, patchesByUuid)
+
+          host = this.getObject(host.$id)
+        }
+      }
+    }
+
+    await this._checkSoftwareVersionAndInstallPatch(patch.uuid, host)
+  },
+
+  async installAllPoolPatchesOnHost (hostId) {
+    let host = this.getObject(hostId)
+
+    const installableByUuid = await this._listMissingPoolPatchesOnHost(host)
+
+    // List of all installable patches sorted from the newest to the
+    // oldest.
+    const installable = sortBy(
+      installableByUuid,
+      patch => -Date.parse(patch.date)
+    )
+
+    for (let i = 0, n = installable.length; i < n; ++i) {
+      const patch = installable[i]
+
+      if (this._isPoolPatchInstallableOnHost(patch.uuid, host)) {
+        await this._installPoolPatchOnHostAndRequirements(patch, host, installableByUuid).catch(error => {
+          if (error.code !== 'PATCH_ALREADY_APPLIED') {
+            throw error
+          }
+        })
+        host = this.getObject(host.$id)
+      }
+    }
+  },
+
+  async installAllPoolPatchesOnAllHosts () {
+    await this.installAllPoolPatchesOnHost(this.pool.master)
+    // TODO: use pool_update.pool_apply for platform_version ^2.1.1
+    await Promise.all(mapToArray(
+      filter(this.objects.all, { $type: 'host' }),
+      host => this.installAllPoolPatchesOnHost(host.$id)
+    ))
+  }
+}
--- a/src/xapi/mixins/vm.js
+++ b/src/xapi/mixins/vm.js
@@ -1,5 +1,7 @@
+import deferrable from 'golike-defer'
 import find from 'lodash/find'
 import gte from 'lodash/gte'
+import isEmpty from 'lodash/isEmpty'
 import lte from 'lodash/lte'

 import {
@@ -13,17 +15,17 @@ import {
 import {
  isVmHvm,
  isVmRunning,
-  makeEditObject
+  makeEditObject,
+  NULL_REF
 } from '../utils'

 export default {
  // TODO: clean up on error.
-  async createVm (templateId, {
+  @deferrable.onFailure
+  async createVm ($onFailure, templateId, {
    name_label, // deprecated
    nameLabel = name_label, // eslint-disable-line camelcase

-    bootAfterCreate = false,
-
    clone = true,
    installRepository = undefined,
    vdis = undefined,
@@ -34,7 +36,7 @@ export default {
    cloudConfig = undefined,

    ...props
-  } = {}) {
+  } = {}, checkLimits) {
    const installMethod = (() => {
      if (installRepository == null) {
        return 'none'
@@ -50,30 +52,30 @@ export default {
    const template = this.getObject(templateId)

    // Clones the template.
-    let vm = await this._getOrWaitObject(
-      await this[clone ? '_cloneVm' : '_copyVm'](template, nameLabel)
-    )
+    const vmRef = await this[clone ? '_cloneVm' : '_copyVm'](template, nameLabel)
+    $onFailure(() => this.deleteVm(vmRef)::pCatch(noop))

    // TODO: copy BIOS strings?

    // Removes disks from the provision XML, we will create them by
    // ourselves.
-    await this.call('VM.remove_from_other_config', vm.$ref, 'disks')::pCatch(noop)
+    await this.call('VM.remove_from_other_config', vmRef, 'disks')::pCatch(noop)

    // Creates the VDIs and executes the initial steps of the
    // installation.
-    await this.call('VM.provision', vm.$ref)
+    await this.call('VM.provision', vmRef)
+
+    let vm = await this._getOrWaitObject(vmRef)

    // Set VMs params.
-    // TODO: checkLimits
-    this._editVm(vm, props)
+    await this._editVm(vm, props, checkLimits)

    // Sets boot parameters.
    {
      const isHvm = isVmHvm(vm)

      if (isHvm) {
-        if (!vdis.length || installMethod === 'network') {
+        if (!isEmpty(vdis) || installMethod === 'network') {
          const { HVM_boot_params: bootParams } = vm
          let order = bootParams.order
          if (order) {
@@ -103,6 +105,9 @@ export default {
      }
    }

+    let nVbds = vm.VBDs.length
+    let hasBootableDisk = !!find(vm.$VBDs, 'bootable')
+
    // Inserts the CD if necessary.
    if (installMethod === 'cd') {
      // When the VM is started, if PV, the CD drive will become not
@@ -110,6 +115,9 @@ export default {
      await this._insertCdIntoVm(installRepository, vm, {
        bootable: true
      })
+      hasBootableDisk = true
+
+      ++nVbds
    }

    // Modify existing (previous template) disks if necessary
@@ -137,9 +145,11 @@ export default {
    // Creates the user defined VDIs.
    //
    // TODO: set vm.suspend_SR
-    if (vdis) {
+    if (!isEmpty(vdis)) {
      const devices = await this.call('VM.get_allowed_VBD_devices', vm.$ref)
      await Promise.all(mapToArray(vdis, (vdiDescription, i) => {
+        ++nVbds
+
        return this._createVdi(
          vdiDescription.size, // FIXME: Should not be done in Xapi.
          {
@@ -150,9 +160,8 @@ export default {
        )
          .then(ref => this._getOrWaitObject(ref))
          .then(vdi => this._createVbd(vm, vdi, {
-            // Only the first VBD if installMethod is not cd is bootable.
-            bootable: installMethod !== 'cd' && !i,
-
+            // Either the CD or the 1st disk is bootable (only useful for PV VMs)
+            bootable: !(hasBootableDisk || i),
            userdevice: devices[i]
          }))
      }))
@@ -162,30 +171,41 @@ export default {
    await Promise.all(mapToArray(vm.$VIFs, vif => this._deleteVif(vif)))

    // Creates the VIFs specified by the user.
+    let nVifs = 0
    if (vifs) {
      const devices = await this.call('VM.get_allowed_VIF_devices', vm.$ref)
-      await Promise.all(mapToArray(vifs, (vif, index) => this._createVif(
-        vm,
-        this.getObject(vif.network),
-        {
-          device: devices[index],
-          mac: vif.mac,
-          mtu: vif.mtu
-        }
-      )))
+      await Promise.all(mapToArray(vifs, (vif, index) => {
+        ++nVifs
+
+        return this._createVif(
+          vm,
+          this.getObject(vif.network),
+          {
+            ipv4_allowed: vif.ipv4_allowed,
+            ipv6_allowed: vif.ipv6_allowed,
+            device: devices[index],
+            locking_mode: isEmpty(vif.ipv4_allowed) && isEmpty(vif.ipv6_allowed) ? 'network_default' : 'locked',
+            mac: vif.mac,
+            mtu: vif.mtu
+          }
+        )
+      }))
    }

    // TODO: Assign VGPUs.

    if (cloudConfig != null) {
      // Refresh the record.
-      vm = this.getObject(vm.$id)
+      vm = await this._waitObjectState(vm.$id, vm => vm.VBDs.length === nVbds)

      // Find the SR of the first VDI.
      let srRef
      forEach(vm.$VBDs, vbd => {
-        const vdi = vbd.$VDI
-        if (vdi) {
+        let vdi
+        if (
+          vbd.type === 'Disk' &&
+          (vdi = vbd.$VDI)
+        ) {
          srRef = vdi.SR
          return false
        }
@@ -195,19 +215,32 @@ export default {
        ? 'createCoreOsCloudInitConfigDrive'
        : 'createCloudInitConfigDrive'
      await this[method](vm.$id, srRef, cloudConfig)
+
+      ++nVbds
    }

-    if (bootAfterCreate) {
-      this._startVm(vm)::pCatch(noop)
-    }
-
-    return this._waitObject(vm.$id)
+    // wait for the record with all the VBDs and VIFs
+    return this._waitObjectState(vm.$id, vm =>
+      vm.VBDs.length === nVbds &&
+      vm.VIFs.length === nVifs
+    )
  },

  // High level method to edit a VM.
  //
  // Params do not correspond directly to XAPI props.
  _editVm: makeEditObject({
+    affinityHost: {
+      get: 'affinity',
+      set (value, vm) {
+        return this._setObjectProperty(
+          vm,
+          'affinity',
+          value ? this.getObject(value).$ref : NULL_REF
+        )
+      }
+    },
+
    autoPoweron: {
      set (value, vm) {
        return Promise.all([
@@ -243,7 +276,6 @@ export default {
    },

    cpuCap: {
-      addToLimits: true,
      get: vm => vm.VCPUs_params.cap && +vm.VCPUs_params.cap,
      set (cap, vm) {
        return this._updateObjectMapProperty(vm, 'VCPUs_params', { cap })
@@ -260,7 +292,6 @@ export default {
    },

    cpuWeight: {
-      addToLimits: true,
      get: vm => vm.VCPUs_params.weight && +vm.VCPUs_params.weight,
      set (weight, vm) {
        return this._updateObjectMapProperty(vm, 'VCPUs_params', { weight })
@@ -285,6 +316,7 @@ export default {
    memory: 'memoryMax',
    memoryMax: {
      addToLimits: true,
+      limitName: 'memory',
      constraints: {
        memoryMin: lte,
        memoryStaticMax: gte
@@ -307,10 +339,33 @@ export default {

    nameLabel: true,

-    PV_args: true
+    PV_args: true,
+
+    tags: true
  }),

-  async editVm (id, props) {
-    return /* await */ this._editVm(this.getObject(id), props)
+  async editVm (id, props, checkLimits) {
+    return /* await */ this._editVm(this.getObject(id), props, checkLimits)
+  },
+
+  async revertVm (snapshotId, snapshotBefore = true) {
+    const snapshot = this.getObject(snapshotId)
+    if (snapshotBefore) {
+      await this._snapshotVm(snapshot.$snapshot_of)
+    }
+    await this.call('VM.revert', snapshot.$ref)
+    if (snapshot.snapshot_info['power-state-at-snapshot'] === 'Running') {
+      const vm = snapshot.$snapshot_of
+      if (vm.power_state === 'Halted') {
+        this.startVm(vm.$id)::pCatch(noop)
+      } else if (vm.power_state === 'Suspended') {
+        this.resumeVm(vm.$id)::pCatch(noop)
+      }
+    }
+  },
+
+  async resumeVm (vmId) {
+    // the force parameter is always true
+    return this.call('VM.resume', this.getObject(vmId).$ref, false, true)
  }
 }
--- a/src/xapi/other-config-template.js
+++ b/src/xapi/other-config-template.js
@@ -0,0 +1,53 @@
+import { NULL_REF } from './utils'
+
+const OTHER_CONFIG_TEMPLATE = {
+  actions_after_crash: 'restart',
+  actions_after_reboot: 'restart',
+  actions_after_shutdown: 'destroy',
+  affinity: null,
+  blocked_operations: {},
+  ha_always_run: false,
+  HVM_boot_params: {
+    order: 'cdn'
+  },
+  HVM_boot_policy: 'BIOS order',
+  HVM_shadow_multiplier: 1,
+  is_a_template: false,
+  memory_dynamic_max: 4294967296,
+  memory_dynamic_min: 4294967296,
+  memory_static_max: 4294967296,
+  memory_static_min: 134217728,
+  order: 0,
+  other_config: {
+    vgpu_pci: '',
+    base_template_name: 'Other install media',
+    mac_seed: '5e88eb6a-d680-c47f-a94a-028886971ba4',
+    'install-methods': 'cdrom'
+  },
+  PCI_bus: '',
+  platform: {
+    timeoffset: '0',
+    nx: 'true',
+    acpi: '1',
+    apic: 'true',
+    pae: 'true',
+    hpet: 'true',
+    viridian: 'true'
+  },
+  protection_policy: NULL_REF,
+  PV_args: '',
+  PV_bootloader: '',
+  PV_bootloader_args: '',
+  PV_kernel: '',
+  PV_legacy_args: '',
+  PV_ramdisk: '',
+  recommendations: '<restrictions><restriction field="memory-static-max" max="137438953472" /><restriction field="vcpus-max" max="32" /><restriction property="number-of-vbds" max="255" /><restriction property="number-of-vifs" max="7" /><restriction field="has-vendor-device" value="false" /></restrictions>',
+  shutdown_delay: 0,
+  start_delay: 0,
+  user_version: 1,
+  VCPUs_at_startup: 1,
+  VCPUs_max: 1,
+  VCPUs_params: {},
+  version: 0
+}
+export { OTHER_CONFIG_TEMPLATE as default }
--- a/src/xapi/utils.js
+++ b/src/xapi/utils.js
@@ -1,9 +1,13 @@
 // import isFinite from 'lodash/isFinite'
 import camelCase from 'lodash/camelCase'
+import createDebug from 'debug'
 import isEqual from 'lodash/isEqual'
+import isPlainObject from 'lodash/isPlainObject'
 import pickBy from 'lodash/pickBy'
 import { utcFormat, utcParse } from 'd3-time-format'
+import { satisfies as versionSatisfies } from 'semver'

+import httpRequest from '../http-request'
 import {
  camelToSnakeCase,
  createRawObject,
@@ -12,11 +16,12 @@ import {
  isBoolean,
  isFunction,
  isInteger,
-  isObject,
  isString,
  map,
+  mapFilter,
  mapToArray,
-  noop
+  noop,
+  pFinally
 } from '../utils'

 // ===================================================================
@@ -48,7 +53,10 @@ export const prepareXapiParam = param => {
  if (isBoolean(param)) {
    return asBoolean(param)
  }
-  if (isObject(param)) {
+  if (isArray(param)) {
+    return map(param, prepareXapiParam)
+  }
+  if (isPlainObject(param)) {
    return map(filterUndefineds(param), prepareXapiParam)
  }

@@ -57,6 +65,10 @@ export const prepareXapiParam = param => {

 // -------------------------------------------------------------------

+export const debug = createDebug('xo:xapi')
+
+// -------------------------------------------------------------------
+
 const OPAQUE_REF_RE = /OpaqueRef:[0-9a-z-]+/
 export const extractOpaqueRef = str => {
  const matches = OPAQUE_REF_RE.exec(str)
@@ -85,6 +97,7 @@ forEach([
  'VDI',
  'VGPU',
  'VGPU_type',
+  'VIF',
  'VLAN',
  'VM',
  'VM_appliance',
@@ -130,17 +143,6 @@ export const isVmRunning = vm => VM_RUNNING_POWER_STATES[vm.power_state]

 const _DEFAULT_ADD_TO_LIMITS = (next, current) => next - current

-const _mapFilter = (collection, iteratee) => {
-  const result = []
-  forEach(collection, (...args) => {
-    const value = iteratee(...args)
-    if (value) {
-      result.push(value)
-    }
-  })
-  return result
-}
-
 export const makeEditObject = specs => {
  const normalizeGet = (get, name) => {
    if (get === true) {
@@ -169,8 +171,9 @@ export const makeEditObject = specs => {
    if (isString(set)) {
      const index = set.indexOf('.')
      if (index === -1) {
+        const prop = camelToSnakeCase(set)
        return function (value) {
-          return this._set(set, value)
+          return this._set(prop, value)
        }
      }

@@ -213,6 +216,9 @@ export const makeEditObject = specs => {
    if (spec.addToLimits === true) {
      spec.addToLimits = _DEFAULT_ADD_TO_LIMITS
    }
+    if (!spec.limitName) {
+      spec.limitName = name
+    }

    forEach(spec.constraints, (constraint, constraintName) => {
      if (!isFunction(constraint)) {
@@ -291,7 +297,7 @@ export const makeEditObject = specs => {

        let addToLimits
        if (limits && (addToLimits = spec.addToLimits)) {
-          limits[name] = addToLimits(value, current)
+          limits[spec.limitName] = addToLimits(value, current)
        }
      }

@@ -302,14 +308,20 @@ export const makeEditObject = specs => {
        const cbs = []

        forEach(constraints, (constraint, constraintName) => {
-          // This constraint value is already defined: bypass the constraint.
-          if (values[constraintName] != null) {
-            return
-          }
+          // Before setting a property to a new value, if the constraint check fails (e.g. memoryMin > memoryMax):
+          //    - if the user wants to set the constraint (ie constraintNewValue is defined):
+          //        constraint <-- constraintNewValue THEN property <-- value (e.g. memoryMax <-- 2048 THEN memoryMin <-- 1024)
+          //    - if the user DOES NOT want to set the constraint (ie constraintNewValue is NOT defined):
+          //        constraint <-- value THEN property <-- value (e.g. memoryMax <-- 1024 THEN memoryMin <-- 1024)
+          // FIXME: Some values combinations will lead to setting the same property twice, which is not perfect but works for now.
+          const constraintCurrentValue = specs[constraintName].get(object)
+          const constraintNewValue = values[constraintName]

-          if (!constraint(specs[constraintName].get(object), value)) {
-            const cb = set(value, constraintName)
-            cbs.push(cb)
+          if (!constraint(constraintCurrentValue, value)) {
+            const cb = set(constraintNewValue == null ? value : constraintNewValue, constraintName)
+            if (cb) {
+              cbs.push(cb)
+            }
          }
        })

@@ -321,7 +333,7 @@ export const makeEditObject = specs => {
      return cb
    }

-    const cbs = _mapFilter(values, set)
+    const cbs = mapFilter(values, set)

    if (checkLimits) {
      await checkLimits(limits, object)
@@ -330,3 +342,51 @@ export const makeEditObject = specs => {
    return Promise.all(mapToArray(cbs, cb => cb())).then(noop)
  }
 }
+
+// ===================================================================
+
+export const NULL_REF = 'OpaqueRef:NULL'
+
+// ===================================================================
+
+// HTTP put, use an ugly hack if the length is not known because XAPI
+// does not support chunk encoding.
+export const put = (stream, {
+  headers: { ...headers } = {},
+  ...opts
+}, task) => {
+  const makeRequest = () => httpRequest({
+    ...opts,
+    body: stream,
+    headers,
+    method: 'put'
+  })
+
+  // Xen API does not support chunk encoding.
+  if (stream.length == null) {
+    headers['transfer-encoding'] = null
+
+    const promise = makeRequest()
+
+    if (task) {
+      // Some connections need the task to resolve (VDI import).
+      task::pFinally(() => {
+        promise.cancel()
+      })
+    } else {
+      // Some tasks need the connection to close (VM import).
+      promise.request.once('finish', () => {
+        promise.cancel()
+      })
+    }
+
+    return promise.readAll()
+  }
+
+  return makeRequest().readAll()
+}
+
+export const useUpdateSystem = host => {
+  // Match Xen Center's condition: https://github.com/xenserver/xenadmin/blob/f3a64fc54bbff239ca6f285406d9034f57537d64/XenModel/Utils/Helpers.cs#L420
+  return versionSatisfies(host.software_version.platform_version, '^2.1.1')
+}
--- a/src/xo-mixins/.index-modules
+++ b/src/xo-mixins/.index-modules
--- a/src/xo-mixins/acls.js
+++ b/src/xo-mixins/acls.js
@@ -19,11 +19,29 @@ export default class {
  constructor (xo) {
    this._xo = xo

-    this._acls = new Acls({
+    const aclsDb = this._acls = new Acls({
      connection: xo._redis,
      prefix: 'xo:acl',
      indexes: ['subject', 'object']
    })
+
+    xo.on('start', () => {
+      xo.addConfigManager('acls',
+        () => aclsDb.get(),
+        acls => aclsDb.update(acls)
+      )
+    })
+
+    xo.on('clean', async () => {
+      const acls = await aclsDb.get()
+      const toRemove = []
+      forEach(acls, ({ subject, object, action, id }) => {
+        if (!subject || !object || !action) {
+          toRemove.push(id)
+        }
+      })
+      await aclsDb.remove(toRemove)
+    })
  }

  async _getAclsForUser (userId) {
@@ -39,10 +57,9 @@ export default class {
      push.apply(acls, entries)
    })(acls.push)

-    const collection = this._acls
    await Promise.all(mapToArray(
      subjects,
-      subject => collection.get({subject}).then(pushAcls)
+      subject => this.getAclsForSubject(subject).then(pushAcls)
    ))

    return acls
@@ -67,6 +84,10 @@ export default class {
    return this._acls.get()
  }

+  async getAclsForSubject (subjectId) {
+    return this._acls.get({ subject: subjectId })
+  }
+
  async getPermissionsForUser (userId) {
    const [
      acls,
--- a/src/xo-mixins/api.js
+++ b/src/xo-mixins/api.js
@@ -1,30 +1,26 @@
 import createDebug from 'debug'
-const debug = createDebug('xo:api')
-
-import getKeys from 'lodash/keys'
 import kindOf from 'kindof'
-import moment from 'moment-timezone'
 import ms from 'ms'
 import schemaInspector from 'schema-inspector'

+import * as methods from '../api'
 import {
-  InvalidParameters,
-  MethodNotFound,
-  NoSuchObject,
-  Unauthorized
-} from './api-errors'
-import {
-  version as xoServerVersion
-} from '../package.json'
+  MethodNotFound
+} from 'json-rpc-peer'
 import {
  createRawObject,
  forEach,
  isFunction,
-  noop
-} from './utils'
+  noop,
+  serializeError
+} from '../utils'
+
+import * as errors from 'xo-common/api-errors'

 // ===================================================================

+const debug = createDebug('xo:api')
+
 const PERMISSIONS = {
  none: 0,
  read: 1,
@@ -32,39 +28,30 @@ const PERMISSIONS = {
  admin: 3
 }

+// TODO:
+// - error when adding a server to a pool with incompatible version
+// - error when halted VM migration failure is due to XS < 7
+const XAPI_ERROR_TO_XO_ERROR = {
+  EHOSTUNREACH: errors.serverUnreachable,
+  HOST_OFFLINE: ([ host ], getId) => errors.hostOffline({ host: getId(host) }),
+  NO_HOSTS_AVAILABLE: errors.noHostsAvailable,
+  NOT_SUPPORTED_DURING_UPGRADE: errors.notSupportedDuringUpgrade,
+  OPERATION_BLOCKED: ([ ref, code ], getId) => errors.operationBlocked({ objectId: getId(ref), code }),
+  PATCH_PRECHECK_FAILED_ISO_MOUNTED: ([ patch ]) => errors.patchPrecheck({ errorType: 'isoMounted', patch }),
+  PIF_VLAN_EXISTS: ([ pif ], getId) => errors.objectAlreadyExists({ objectId: getId(pif), objectType: 'PIF' }),
+  SESSION_AUTHENTICATION_FAILED: errors.authenticationFailed,
+  VDI_IN_USE: ([ vdi, operation ], getId) => errors.vdiInUse({ vdi: getId(vdi), operation }),
+  VM_BAD_POWER_STATE: ([ vm, expected, actual ], getId) => errors.vmBadPowerState({ vm: getId(vm), expected, actual }),
+  VM_IS_TEMPLATE: errors.vmIsTemplate,
+  VM_LACKS_FEATURE: ([ vm ], getId) => errors.vmLacksFeature({ vm: getId(vm) }),
+  VM_LACKS_FEATURE_SHUTDOWN: ([ vm ], getId) => errors.vmLacksFeature({ vm: getId(vm), feature: 'shutdown' }),
+  VM_MISSING_PV_DRIVERS: ([ vm ], getId) => errors.vmMissingPvDrivers({ vm: getId(vm) })
+}
+
 const hasPermission = (user, permission) => (
  PERMISSIONS[user.permission] >= PERMISSIONS[permission]
 )

-// FIXME: this function is specific to XO and should not be defined in
-// this file.
-function checkPermission (method) {
-  /* jshint validthis: true */
-
-  const {permission} = method
-
-  // No requirement.
-  if (permission === undefined) {
-    return
-  }
-
-  const {user} = this
-  if (!user) {
-    throw new Unauthorized()
-  }
-
-  // The only requirement is login.
-  if (!permission) {
-    return
-  }
-
-  if (!hasPermission(user, permission)) {
-    throw new Unauthorized()
-  }
-}
-
-// -------------------------------------------------------------------
-
 function checkParams (method, params) {
  const schema = method.params
  if (!schema) {
@@ -77,11 +64,34 @@ function checkParams (method, params) {
  }, params)

  if (!result.valid) {
-    throw new InvalidParameters(result.error)
+    throw errors.invalidParameters(result.error)
  }
 }

-// -------------------------------------------------------------------
+function checkPermission (method) {
+  /* jshint validthis: true */
+
+  const {permission} = method
+
+  // No requirement.
+  if (permission === undefined) {
+    return
+  }
+
+  const {user} = this
+  if (!user) {
+    throw errors.unauthorized()
+  }
+
+  // The only requirement is login.
+  if (!permission) {
+    return
+  }
+
+  if (!hasPermission(user, permission)) {
+    throw errors.unauthorized()
+  }
+}

 function resolveParams (method, params) {
  const resolve = method.resolve
@@ -91,7 +101,7 @@ function resolveParams (method, params) {

  const {user} = this
  if (!user) {
-    throw new Unauthorized()
+    throw errors.unauthorized()
  }

  const userId = user.id
@@ -127,95 +137,29 @@ function resolveParams (method, params) {
      return params
    }

-    throw new Unauthorized()
+    throw errors.unauthorized()
  })
 }

 // ===================================================================

-function getMethodsInfo () {
-  const methods = {}
-
-  forEach(this.api._methods, (method, name) => {
-    methods[name] = {
-      description: method.description,
-      params: method.params || {},
-      permission: method.permission
-    }
-  })
-
-  return methods
-}
-getMethodsInfo.description = 'returns the signatures of all available API methods'
-
-// -------------------------------------------------------------------
-
-const getServerVersion = () => xoServerVersion
-getServerVersion.description = 'return the version of xo-server'
-
-// -------------------------------------------------------------------
-
-const getVersion = () => '0.1'
-getVersion.description = 'API version (unstable)'
-
-// -------------------------------------------------------------------
-
-function listMethods () {
-  return getKeys(this.api._methods)
-}
-listMethods.description = 'returns the name of all available API methods'
-
-// -------------------------------------------------------------------
-
-function methodSignature ({method: name}) {
-  const method = this.api.getMethod(name)
-
-  if (!method) {
-    throw new NoSuchObject()
-  }
-
-  // Return an array for compatibility with XML-RPC.
-  return [
-    // XML-RPC require the name of the method.
-    {
-      name,
-      description: method.description,
-      params: method.params || {},
-      permission: method.permission
-    }
-  ]
-}
-methodSignature.description = 'returns the signature of an API method'
-
-// ===================================================================
-
-const getServerTimezone = (tz => () => tz)(moment.tz.guess())
-getServerTimezone.description = 'return the timezone server'
-
-// ===================================================================
-
 export default class Api {
-  constructor ({
-    context,
-    verboseLogsOnErrors
-  } = {}) {
+  constructor (xo) {
+    this._logger = null
    this._methods = createRawObject()
-    this._verboseLogsOnErrors = verboseLogsOnErrors
-    this.context = context
+    this._xo = xo

-    this.addMethods({
-      system: {
-        getMethodsInfo,
-        getServerVersion,
-        getServerTimezone,
-        getVersion,
-        listMethods,
-        methodSignature
-      }
+    this.addApiMethods(methods)
+    xo.on('start', async () => {
+      this._logger = await xo.getLogger('api')
    })
  }

-  addMethod (name, method) {
+  get apiMethods () {
+    return this._methods
+  }
+
+  addApiMethod (name, method) {
    const methods = this._methods

    if (name in methods) {
@@ -224,21 +168,22 @@ export default class Api {

    methods[name] = method

-    let unset = () => {
+    let remove = () => {
      delete methods[name]
-      unset = noop
+      remove = noop
    }
-    return () => unset()
+    return () => remove()
  }

-  addMethods (methods) {
+  addApiMethods (methods) {
    let base = ''
+    const removes = []

    const addMethod = (method, name) => {
      name = base + name

      if (isFunction(method)) {
-        this.addMethod(name, method)
+        removes.push(this.addApiMethod(name, method))
        return
      }

@@ -247,20 +192,35 @@ export default class Api {
      forEach(method, addMethod)
      base = oldBase
    }
-    forEach(methods, addMethod)
+
+    try {
+      forEach(methods, addMethod)
+    } catch (error) {
+      // Remove all added methods.
+      forEach(removes, remove => remove())
+
+      // Forward the error
+      throw error
+    }
+
+    let remove = () => {
+      forEach(removes, remove => remove())
+      remove = noop
+    }
+    return remove
  }

-  async call (session, name, params) {
+  async callApiMethod (session, name, params) {
    const startTime = Date.now()

-    const method = this.getMethod(name)
+    const method = this._methods[name]
    if (!method) {
      throw new MethodNotFound(name)
    }

    // FIXME: it can cause issues if there any property assignments in
    // XO methods called from the API.
-    const context = Object.create(this.context, {
+    const context = Object.create(this._xo, {
      api: { // Used by system.*().
        value: this
      },
@@ -269,10 +229,9 @@ export default class Api {
      }
    })

-    // FIXME: too coupled with XO.
    // Fetch and inject the current user.
    const userId = session.get('user_id', undefined)
-    context.user = userId && await context.getUser(userId)
+    context.user = userId && await this._xo.getUser(userId)
    const userName = context.user
      ? context.user.email
      : '(unknown user)'
@@ -293,7 +252,7 @@ export default class Api {
        params.id = params[namespace]
      }

-      checkParams(method, params)
+      checkParams.call(context, method, params)

      const resolvedParams = await resolveParams.call(context, method, params)

@@ -315,15 +274,19 @@ export default class Api {

      return result
    } catch (error) {
-      if (this._verboseLogsOnErrors) {
-        debug(
-          '%s | %s(%j) [%s] =!> %s',
-          userName,
-          name,
-          params,
-          ms(Date.now() - startTime),
-          error
-        )
+      const data = {
+        userId,
+        method: name,
+        params,
+        duration: Date.now() - startTime,
+        error: serializeError(error)
+      }
+      const message = `${userName} | ${name}(${JSON.stringify(params)}) [${ms(Date.now() - startTime)}] =!> ${error}`
+
+      this._logger.error(message, data)
+
+      if (this._xo._config.verboseLogsOnErrors) {
+        debug(message)

        const stack = error && error.stack
        if (stack) {
@@ -339,11 +302,18 @@ export default class Api {
        )
      }

+      const xoError = XAPI_ERROR_TO_XO_ERROR[error.code]
+      if (xoError) {
+        throw xoError(error.params, ref => {
+          try {
+            return this._xo.getObject(ref).id
+          } catch (e) {
+            return ref
+          }
+        })
+      }
+
      throw error
    }
  }
-
-  getMethod (name) {
-    return this._methods[name]
-  }
 }
--- a/src/xo-mixins/authentication.js
+++ b/src/xo-mixins/authentication.js
@@ -1,9 +1,8 @@
 import Token, { Tokens } from '../models/token'
-import {
-  NoSuchObject
-} from '../api-errors'
+import { noSuchObject } from 'xo-common/api-errors'
 import {
  createRawObject,
+  forEach,
  generateToken,
  pCatch,
  noop
@@ -11,13 +10,10 @@ import {

 // ===================================================================

-class NoSuchAuthenticationToken extends NoSuchObject {
-  constructor (id) {
-    super(id, 'authentication token')
-  }
-}
+const noSuchAuthenticationToken = id =>
+  noSuchObject(id, 'authenticationToken')

-// ===================================================================
+const ONE_MONTH = 1e3 * 60 * 60 * 24 * 30

 export default class {
  constructor (xo) {
@@ -30,7 +26,7 @@ export default class {
    this._providers = new Set()

    // Creates persistent collections.
-    this._tokens = new Tokens({
+    const tokensDb = this._tokens = new Tokens({
      connection: xo._redis,
      prefix: 'xo:token',
      indexes: ['user_id']
@@ -61,9 +57,26 @@ export default class {

      try {
        return (await xo.getAuthenticationToken(tokenId)).user_id
-      } catch (e) {
-        return
-      }
+      } catch (error) {}
+    })
+
+    xo.on('clean', async () => {
+      const tokens = await tokensDb.get()
+      const toRemove = []
+      const now = Date.now()
+      forEach(tokens, ({ expiration, id }) => {
+        if (!expiration || expiration < now) {
+          toRemove.push(id)
+        }
+      })
+      await tokensDb.remove(toRemove)
+    })
+
+    xo.on('start', () => {
+      xo.addConfigManager('authTokens',
+        () => tokensDb.get(),
+        tokens => tokensDb.update(tokens)
+      )
    })
  }

@@ -141,7 +154,7 @@ export default class {
    const token = new Token({
      id: await generateToken(),
      user_id: userId,
-      expiration: Date.now() + 1e3 * 60 * 60 * 24 * 30 // 1 month validity.
+      expiration: Date.now() + ONE_MONTH
    })

    await this._tokens.add(token)
@@ -152,14 +165,14 @@ export default class {

  async deleteAuthenticationToken (id) {
    if (!await this._tokens.remove(id)) {
-      throw new NoSuchAuthenticationToken(id)
+      throw noSuchAuthenticationToken(id)
    }
  }

  async getAuthenticationToken (id) {
    let token = await this._tokens.first(id)
    if (!token) {
-      throw new NoSuchAuthenticationToken(id)
+      throw noSuchAuthenticationToken(id)
    }

    token = token.properties
@@ -169,7 +182,7 @@ export default class {
    )) {
      this._tokens.remove(id)::pCatch(noop)

-      throw new NoSuchAuthenticationToken(id)
+      throw noSuchAuthenticationToken(id)
    }

    return token
--- a/src/xo-mixins/backups.js
+++ b/src/xo-mixins/backups.js
@@ -1,29 +1,44 @@
-import endsWith from 'lodash/endsWith'
+import deferrable from 'golike-defer'
 import escapeStringRegexp from 'escape-string-regexp'
 import eventToPromise from 'event-to-promise'
-import filter from 'lodash/filter'
-import find from 'lodash/find'
-import findIndex from 'lodash/findIndex'
-import sortBy from 'lodash/sortBy'
-import startsWith from 'lodash/startsWith'
+import execa from 'execa'
+import splitLines from 'split-lines'
+import { createParser as createPairsParser } from 'parse-pairs'
+import { createReadStream, readdir, stat } from 'fs'
+import { satisfies as versionSatisfies } from 'semver'
+import { utcFormat } from 'd3-time-format'
 import {
  basename,
  dirname
 } from 'path'
-import { satisfies as versionSatisfies } from 'semver'
-
-import vhdMerge from '../vhd-merge'
-import xapiObjectToXo from '../xapi-object-to-xo'
 import {
-  deferrable
-} from '../decorators'
+  endsWith,
+  filter,
+  find,
+  findIndex,
+  includes,
+  once,
+  sortBy,
+  startsWith,
+  trim
+} from 'lodash'
+
+import vhdMerge, { chainVhd } from '../vhd-merge'
+import xapiObjectToXo from '../xapi-object-to-xo'
+import { lvs, pvs } from '../lvm'
 import {
  forEach,
+  mapFilter,
  mapToArray,
  noop,
  pCatch,
+  pFinally,
+  pFromCallback,
  pSettle,
-  safeDateFormat
+  resolveSubpath,
+  safeDateFormat,
+  safeDateParse,
+  tmpDir
 } from '../utils'
 import {
  VDI_FORMAT_VHD
@@ -34,6 +49,8 @@ import {
 const DELTA_BACKUP_EXT = '.json'
 const DELTA_BACKUP_EXT_LENGTH = DELTA_BACKUP_EXT.length

+const shortDate = utcFormat('%Y-%m-%d')
+
 // Test if a file is a vdi backup. (full or delta)
 const isVdiBackup = name => /^\d+T\d+Z_(?:full|delta)\.vhd$/.test(name)

@@ -41,6 +58,41 @@ const isVdiBackup = name => /^\d+T\d+Z_(?:full|delta)\.vhd$/.test(name)
 const isDeltaVdiBackup = name => /^\d+T\d+Z_delta\.vhd$/.test(name)
 const isFullVdiBackup = name => /^\d+T\d+Z_full\.vhd$/.test(name)

+const toTimestamp = date => date && Math.round(date.getTime() / 1000)
+
+const parseVmBackupPath = name => {
+  const base = basename(name)
+  let baseMatches
+
+  baseMatches = /^([^_]+)_([^_]+)_(.+)\.xva$/.exec(base)
+  if (baseMatches) {
+    return {
+      datetime: toTimestamp(safeDateParse(baseMatches[1])),
+      id: name,
+      name: baseMatches[3],
+      tag: baseMatches[2],
+      type: 'xva'
+    }
+  }
+
+  let dirMatches
+  if (
+    (baseMatches = /^([^_]+)_(.+)\.json$/.exec(base)) &&
+    (dirMatches = /^vm_delta_([^_]+)_(.+)$/.exec(basename(dirname(name))))
+  ) {
+    return {
+      datetime: toTimestamp(safeDateParse(baseMatches[1])),
+      id: name,
+      name: baseMatches[2],
+      tag: dirMatches[1],
+      type: 'delta',
+      uuid: dirMatches[2]
+    }
+  }
+
+  throw new Error('invalid VM backup filename')
+}
+
 // Get the timestamp of a vdi backup. (full or delta)
 const getVdiTimestamp = name => {
  const arr = /^(\d+T\d+Z)_(?:full|delta)\.vhd$/.exec(name)
@@ -50,21 +102,200 @@ const getVdiTimestamp = name => {
 const getDeltaBackupNameWithoutExt = name => name.slice(0, -DELTA_BACKUP_EXT_LENGTH)
 const isDeltaBackup = name => endsWith(name, DELTA_BACKUP_EXT)

+// Checksums have been corrupted between 5.2.6 and 5.2.7.
+//
+// For a short period of time, bad checksums will be regenerated
+// instead of rejected.
+//
+// TODO: restore when enough time has passed (a week/a month).
 async function checkFileIntegrity (handler, name) {
-  let stream
+  await handler.refreshChecksum(name)
+  //  let stream
+  //
+  //  try {
+  //    stream = await handler.createReadStream(name, { checksum: true })
+  //  } catch (error) {
+  //    if (error.code === 'ENOENT') {
+  //      return
+  //    }
+  //
+  //    throw error
+  //  }
+  //
+  //  stream.resume()
+  //  await eventToPromise(stream, 'finish')
+}

-  try {
-    stream = await handler.createReadStream(name, { checksum: true })
-  } catch (error) {
-    if (error.code === 'ENOENT') {
-      return
-    }
+// -------------------------------------------------------------------

-    throw error
+const listPartitions = (() => {
+  const IGNORED = {}
+  forEach([
+    // https://github.com/jhermsmeier/node-mbr/blob/master/lib/partition.js#L38
+    0x05, 0x0F, 0x85, 0x15, 0x91, 0x9B, 0x5E, 0x5F, 0xCF, 0xD5, 0xC5,
+
+    0x82 // swap
+  ], type => {
+    IGNORED[type] = true
+  })
+
+  const TYPES = {
+    0x7: 'NTFS',
+    0x83: 'linux',
+    0xc: 'FAT'
  }

-  stream.resume()
-  await eventToPromise(stream, 'finish')
+  const parseLine = createPairsParser({
+    keyTransform: key => key === 'UUID'
+      ? 'id'
+      : key.toLowerCase(),
+    valueTransform: (value, key) => key === 'start' || key === 'size'
+      ? +value
+      : key === 'type'
+        ? TYPES[+value] || value
+        : value
+  })
+
+  return device => execa.stdout('partx', [
+    '--bytes',
+    '--output=NR,START,SIZE,NAME,UUID,TYPE',
+    '--pairs',
+    device.path
+  ]).then(stdout => mapFilter(splitLines(stdout), line => {
+    const partition = parseLine(line)
+    const { type } = partition
+    if (type != null && !IGNORED[+type]) {
+      return partition
+    }
+  }))
+})()
+
+// handle LVM logical volumes automatically
+const listPartitions2 = device => listPartitions(device).then(partitions => {
+  const partitions2 = []
+  const promises = []
+  forEach(partitions, partition => {
+    if (+partition.type === 0x8e) {
+      promises.push(mountLvmPv(device, partition).then(device => {
+        const promise = listLvmLvs(device).then(lvs => {
+          forEach(lvs, lv => {
+            partitions2.push({
+              name: lv.lv_name,
+              size: +lv.lv_size,
+              id: `${partition.id}/${lv.vg_name}/${lv.lv_name}`
+            })
+          })
+        })
+        promise::pFinally(device.unmount)
+        return promise
+      }))
+    } else {
+      partitions2.push(partition)
+    }
+  })
+  return Promise.all(promises).then(() => partitions2)
+})
+
+const mountPartition = (device, partitionId) => Promise.all([
+  partitionId != null && listPartitions(device),
+  tmpDir()
+]).then(([ partitions, path ]) => {
+  const options = [
+    'loop',
+    'ro'
+  ]
+
+  if (partitions) {
+    const partition = find(partitions, { id: partitionId })
+
+    const { start } = partition
+    if (start != null) {
+      options.push(`offset=${start * 512}`)
+    }
+  }
+
+  const mount = options => execa('mount', [
+    `--options=${options.join(',')}`,
+    `--source=${device.path}`,
+    `--target=${path}`
+  ])
+
+  // `noload` option is used for ext3/ext4, if it fails it might
+  // `be another fs, try without
+  return mount([ ...options, 'noload' ]).catch(() =>
+    mount(options)
+  ).then(() => ({
+    path,
+    unmount: once(() => execa('umount', [ '--lazy', path ]))
+  }), error => {
+    console.log(error)
+
+    throw error
+  })
+})
+
+// handle LVM logical volumes automatically
+const mountPartition2 = (device, partitionId) => {
+  if (
+    partitionId == null ||
+    !includes(partitionId, '/')
+  ) {
+    return mountPartition(device, partitionId)
+  }
+
+  const [ pvId, vgName, lvName ] = partitionId.split('/')
+
+  return listPartitions(device).then(partitions =>
+    find(partitions, { id: pvId })
+  ).then(pvId => mountLvmPv(device, pvId)).then(device1 =>
+    execa('vgchange', [ '-ay', vgName ]).then(() =>
+      lvs([ 'lv_name', 'lv_path' ], vgName).then(lvs =>
+        find(lvs, { lv_name: lvName }).lv_path
+      )
+    ).then(path =>
+      mountPartition({ path }).then(device2 => ({
+        ...device2,
+        unmount: () => device2.unmount().then(device1.unmount)
+      }))
+    ).catch(error => device1.unmount().then(() => {
+      throw error
+    }))
+  )
+}
+
+// -------------------------------------------------------------------
+
+const listLvmLvs = device => pvs([
+  'lv_name',
+  'lv_path',
+  'lv_size',
+  'vg_name'
+], device.path).then(pvs => filter(pvs, 'lv_name'))
+
+const mountLvmPv = (device, partition) => {
+  const args = []
+  if (partition) {
+    args.push('-o', partition.start * 512)
+  }
+  args.push(
+    '--show',
+    '-f',
+    device.path
+  )
+
+  return execa.stdout('losetup', args).then(stdout => {
+    const path = trim(stdout)
+    return {
+      path,
+      unmount: once(() => Promise.all([
+        execa('losetup', [ '-d', path ]),
+        pvs('vg_name', path).then(vgNames => execa('vgchange', [
+          '-an',
+          ...vgNames
+        ]))
+      ]))
+    }
+  })
 }

 // ===================================================================
@@ -72,6 +303,15 @@ async function checkFileIntegrity (handler, name) {
 export default class {
  constructor (xo) {
    this._xo = xo
+
+    // clean any LVM volumes that might have not been properly
+    // unmounted
+    xo.on('start', () => Promise.all([
+      execa('losetup', [ '-D' ]),
+      execa('vgchange', [ '-an' ])
+    ]).then(() =>
+      execa('pvscan', [ '--cache' ])
+    ))
  }

  async listRemoteBackups (remoteId) {
@@ -101,12 +341,52 @@ export default class {
    return backups
  }

+  async listVmBackups (remoteId) {
+    const handler = await this._xo.getRemoteHandler(remoteId)
+
+    const backups = []
+
+    await Promise.all(mapToArray(await handler.list(), entry => {
+      if (endsWith(entry, '.xva')) {
+        backups.push(parseVmBackupPath(entry))
+      } else if (startsWith(entry, 'vm_delta_')) {
+        return handler.list(entry).then(children => Promise.all(mapToArray(children, child => {
+          if (endsWith(child, '.json')) {
+            const path = `${entry}/${child}`
+
+            const record = parseVmBackupPath(path)
+            backups.push(record)
+
+            return handler.readFile(path).then(data => {
+              record.disks = mapToArray(JSON.parse(data).vdis, vdi => ({
+                id: `${entry}/${vdi.xoPath}`,
+                name: vdi.name_label,
+                uuid: vdi.uuid
+              }))
+            }).catch(noop)
+          }
+        })))
+      }
+    }))
+
+    return backups
+  }
+
  async importVmBackup (remoteId, file, sr) {
    const handler = await this._xo.getRemoteHandler(remoteId)
    const stream = await handler.createReadStream(file)
    const xapi = this._xo.getXapi(sr)

    const vm = await xapi.importVm(stream, { srId: sr._xapiId })
+
+    const { datetime } = parseVmBackupPath(file)
+    await Promise.all([
+      xapi.addTag(vm.$id, 'restored from backup'),
+      xapi.editVm(vm.$id, {
+        name_label: `${vm.name_label} (${shortDate(datetime * 1e3)})`
+      })
+    ])
+
    return xapiObjectToXo(vm).id
  }

@@ -141,7 +421,7 @@ export default class {
          stream => stream.cancel()
        ))

-        return srcXapi.deleteVm(delta.vm.uuid, true)
+        return srcXapi.deleteVm(delta.vm.uuid)
      })

      const promise = targetXapi.importDeltaVm(
@@ -155,7 +435,7 @@ export default class {
      // Once done, (asynchronously) remove the (now obsolete) local
      // base.
      if (localBaseUuid) {
-        promise.then(() => srcXapi.deleteVm(localBaseUuid, true))::pCatch(noop)
+        promise.then(() => srcXapi.deleteVm(localBaseUuid))::pCatch(noop)
      }

      // (Asynchronously) Identify snapshot as future base.
@@ -291,6 +571,18 @@ export default class {
    return backups.slice(i)
  }

+  // fix the parent UUID and filename in delta files after download from xapi or backup compression
+  async _chainDeltaVdiBackups ({handler, dir}) {
+    const backups = await this._listVdiBackups(handler, dir)
+    for (let i = 1; i < backups.length; i++) {
+      const childPath = dir + '/' + backups[i]
+      const modified = await chainVhd(handler, dir + '/' + backups[i - 1], handler, childPath)
+      if (modified) {
+        await handler.refreshChecksum(childPath)
+      }
+    }
+  }
+
  async _mergeDeltaVdiBackups ({handler, dir, depth}) {
    const backups = await this._listVdiBackups(handler, dir)
    let i = backups.length - depth
@@ -432,16 +724,7 @@ export default class {

  @deferrable.onFailure
  async rollingDeltaVmBackup ($onFailure, {vm, remoteId, tag, depth}) {
-    const remote = await this._xo.getRemote(remoteId)
-
-    if (!remote) {
-      throw new Error(`No such Remote ${remoteId}`)
-    }
-    if (!remote.enabled) {
-      throw new Error(`Remote ${remoteId} is disabled`)
-    }
-
-    const handler = await this._xo.getRemoteHandler(remote)
+    const handler = await this._xo.getRemoteHandler(remoteId)
    const xapi = this._xo.getXapi(vm)

    vm = xapi.getObject(vm._xapiId)
@@ -452,7 +735,7 @@ export default class {
      base => base.snapshot_time
    )
    const baseVm = bases.pop()
-    forEach(bases, base => { xapi.deleteVm(base.$id, true)::pCatch(noop) })
+    forEach(bases, base => { xapi.deleteVm(base.$id)::pCatch(noop) })

    // Check backup dirs.
    const dir = `vm_delta_${tag}_${vm.uuid}`
@@ -487,7 +770,7 @@ export default class {
        stream => stream.cancel()
      ))

-      await xapi.deleteVm(delta.vm.$id, true)
+      await xapi.deleteVm(delta.vm.uuid)
    })

    // Save vdis.
@@ -515,15 +798,15 @@ export default class {
    )

    const fulFilledVdiBackups = []
-    let success = true
+    let error

    // One or many vdi backups have failed.
    for (const vdiBackup of vdiBackups) {
      if (vdiBackup.isFulfilled()) {
        fulFilledVdiBackups.push(vdiBackup)
      } else {
-        console.error(`Rejected backup: ${vdiBackup.reason()}`)
-        success = false
+        error = vdiBackup.reason()
+        console.error('Rejected backup:', error)
      }
    }

@@ -535,8 +818,8 @@ export default class {
      )
    })

-    if (!success) {
-      throw new Error('Rolling delta vm backup failed.')
+    if (error) {
+      throw error
    }

    const date = safeDateFormat(new Date())
@@ -553,7 +836,9 @@ export default class {
      mapToArray(vdiBackups, vdiBackup => {
        const backupName = vdiBackup.value()
        const backupDirectory = backupName.slice(0, backupName.lastIndexOf('/'))
-        return this._mergeDeltaVdiBackups({ handler, dir: `${dir}/${backupDirectory}`, depth })
+        const backupDir = `${dir}/${backupDirectory}`
+        return this._mergeDeltaVdiBackups({ handler, dir: backupDir, depth })
+          .then(() => { this._chainDeltaVdiBackups({ handler, dir: backupDir }) })
      })
    )

@@ -561,7 +846,7 @@ export default class {
    await this._removeOldDeltaVmBackups(xapi, { vm, handler, dir, depth })

    if (baseVm) {
-      xapi.deleteVm(baseVm.$id, true)::pCatch(noop)
+      xapi.deleteVm(baseVm.$id)::pCatch(noop)
    }

    // Returns relative path.
@@ -569,10 +854,13 @@ export default class {
  }

  async importDeltaVmBackup ({sr, remoteId, filePath}) {
+    filePath = `${filePath}${DELTA_BACKUP_EXT}`
+    const { datetime } = parseVmBackupPath(filePath)
+
    const handler = await this._xo.getRemoteHandler(remoteId)
    const xapi = this._xo.getXapi(sr)

-    const delta = JSON.parse(await handler.readFile(`${filePath}${DELTA_BACKUP_EXT}`))
+    const delta = JSON.parse(await handler.readFile(filePath))
    let vm
    const { version } = delta

@@ -599,9 +887,12 @@ export default class {
        )
      )

+      delta.vm.name_label += ` (${shortDate(datetime * 1e3)})`
+      delta.vm.tags.push('restored from backup')
+
      vm = await xapi.importDeltaVm(delta, {
-        srId: sr._xapiId,
-        disableStartAfterImport: false
+        disableStartAfterImport: false,
+        srId: sr._xapiId
      })
    } else {
      throw new Error(`Unsupported delta backup version: ${version}`)
@@ -613,16 +904,7 @@ export default class {
  // -----------------------------------------------------------------

  async backupVm ({vm, remoteId, file, compress, onlyMetadata}) {
-    const remote = await this._xo.getRemote(remoteId)
-
-    if (!remote) {
-      throw new Error(`No such Remote ${remoteId}`)
-    }
-    if (!remote.enabled) {
-      throw new Error(`Backup remote ${remoteId} is disabled`)
-    }
-
-    const handler = await this._xo.getRemoteHandler(remote)
+    const handler = await this._xo.getRemoteHandler(remoteId)
    return this._backupVm(vm, handler, file, {compress, onlyMetadata})
  }

@@ -640,16 +922,7 @@ export default class {
  }

  async rollingBackupVm ({vm, remoteId, tag, depth, compress, onlyMetadata}) {
-    const remote = await this._xo.getRemote(remoteId)
-
-    if (!remote) {
-      throw new Error(`No such Remote ${remoteId}`)
-    }
-    if (!remote.enabled) {
-      throw new Error(`Backup remote ${remoteId} is disabled`)
-    }
-
-    const handler = await this._xo.getRemoteHandler(remote)
+    const handler = await this._xo.getRemoteHandler(remoteId)

    const files = await handler.list()

@@ -676,7 +949,7 @@ export default class {
    const promises = []
    for (let surplus = snapshots.length - (depth - 1); surplus > 0; surplus--) {
      const oldSnap = snapshots.shift()
-      promises.push(xapi.deleteVm(oldSnap.uuid, true))
+      promises.push(xapi.deleteVm(oldSnap.uuid))
    }
    await Promise.all(promises)
  }
@@ -690,12 +963,12 @@ export default class {
    const sourceXapi = this._xo.getXapi(vm)
    vm = sourceXapi.getObject(vm._xapiId)

-    const vms = []
+    const vms = {}
    forEach(sr.$VDIs, vdi => {
      const vbds = vdi.$VBDs
      const vm = vbds && vbds[0] && vbds[0].$VM
      if (vm && reg.test(vm.name_label)) {
-        vms.push(vm)
+        vms[vm.$id] = vm
      }
    })
    const olderCopies = sortBy(vms, 'name_label')
@@ -706,11 +979,121 @@ export default class {
    })
    await targetXapi.addTag(drCopy.$id, 'Disaster Recovery')

-    const promises = []
-    for (let surplus = olderCopies.length - (depth - 1); surplus > 0; surplus--) {
-      const oldDRVm = olderCopies.shift()
-      promises.push(targetXapi.deleteVm(oldDRVm.$id, true))
+    const n = 1 - depth
+    await Promise.all(mapToArray(n ? olderCopies.slice(0, n) : olderCopies, vm =>
+      // Do not consider a failure to delete an old copy as a fatal error.
+      targetXapi.deleteVm(vm.$id)::pCatch(noop)
+    ))
+  }
+
+  // -----------------------------------------------------------------
+
+  _mountVhd (remoteId, vhdPath) {
+    return Promise.all([
+      this._xo.getRemoteHandler(remoteId),
+      tmpDir()
+    ]).then(([ handler, mountDir ]) => {
+      if (!handler._getRealPath) {
+        throw new Error(`this remote is not supported`)
+      }
+
+      const remotePath = handler._getRealPath()
+      vhdPath = resolveSubpath(remotePath, vhdPath)
+
+      return Promise.resolve().then(() => {
+        // TODO: remove when no longer necessary.
+        //
+        // Currently, the filenames of the VHD changes over time
+        // (delta → full), but the JSON is not updated, therefore the
+        // VHD path may need to be fixed.
+        return endsWith(vhdPath, '_delta.vhd')
+          ? pFromCallback(cb => stat(vhdPath, cb)).then(
+            () => vhdPath,
+            error => {
+              if (error && error.code === 'ENOENT') {
+                return `${vhdPath.slice(0, -10)}_full.vhd`
+              }
+            }
+          )
+          : vhdPath
+      }).then(vhdPath => execa('vhdimount', [ vhdPath, mountDir ])).then(() =>
+        pFromCallback(cb => readdir(mountDir, cb)).then(entries => {
+          let max = 0
+          forEach(entries, entry => {
+            const matches = /^vhdi(\d+)/.exec(entry)
+            if (matches) {
+              const value = +matches[1]
+              if (value > max) {
+                max = value
+              }
+            }
+          })
+
+          if (!max) {
+            throw new Error('no disks found')
+          }
+
+          return {
+            path: `${mountDir}/vhdi${max}`,
+            unmount: once(() => execa('fusermount', [ '-uz', mountDir ]))
+          }
+        })
+      )
+    })
+  }
+
+  _mountPartition (remoteId, vhdPath, partitionId) {
+    return this._mountVhd(remoteId, vhdPath).then(device =>
+      mountPartition2(device, partitionId).then(partition => ({
+        ...partition,
+        unmount: () => partition.unmount().then(device.unmount)
+      })).catch(error => device.unmount().then(() => {
+        throw error
+      }))
+    )
+  }
+
+  @deferrable
+  async scanDiskBackup ($defer, remoteId, vhdPath) {
+    const device = await this._mountVhd(remoteId, vhdPath)
+    $defer(device.unmount)
+
+    return {
+      partitions: await listPartitions2(device)
    }
-    await Promise.all(promises)
+  }
+
+  @deferrable
+  async scanFilesInDiskBackup ($defer, remoteId, vhdPath, partitionId, path) {
+    const partition = await this._mountPartition(remoteId, vhdPath, partitionId)
+    $defer(partition.unmount)
+
+    path = resolveSubpath(partition.path, path)
+
+    const entries = await pFromCallback(cb => readdir(path, cb))
+
+    const entriesMap = {}
+    await Promise.all(mapToArray(entries, async name => {
+      const stats = await pFromCallback(cb => stat(`${path}/${name}`, cb))::pCatch(noop)
+      if (stats) {
+        entriesMap[stats.isDirectory() ? `${name}/` : name] = {}
+      }
+    }))
+    return entriesMap
+  }
+
+  async fetchFilesInDiskBackup (remoteId, vhdPath, partitionId, paths) {
+    const partition = await this._mountPartition(remoteId, vhdPath, partitionId)
+
+    let i = 0
+    const onEnd = () => {
+      if (!--i) {
+        partition.unmount()
+      }
+    }
+    return mapToArray(paths, path => {
+      ++i
+      return createReadStream(resolveSubpath(partition.path, path)).once('end', onEnd)
+    })
  }
 }
--- a/src/xo-mixins/config-management.js
+++ b/src/xo-mixins/config-management.js
@@ -0,0 +1,33 @@
+import { map, noop } from '../utils'
+
+import { all as pAll } from 'promise-toolbox'
+
+export default class ConfigManagement {
+  constructor () {
+    this._managers = { __proto__: null }
+  }
+
+  addConfigManager (id, exporter, importer) {
+    const managers = this._managers
+    if (id in managers) {
+      throw new Error(`${id} is already taken`)
+    }
+
+    this._managers[id] = { exporter, importer }
+  }
+
+  exportConfig () {
+    return map(this._managers, ({ exporter }, key) => exporter())::pAll()
+  }
+
+  importConfig (config) {
+    const managers = this._managers
+
+    return map(config, (entry, key) => {
+      const manager = managers[key]
+      if (manager) {
+        return manager.importer(entry)
+      }
+    })::pAll().then(noop)
+  }
+}
--- a/src/xo-mixins/ip-pools.js
+++ b/src/xo-mixins/ip-pools.js
@@ -0,0 +1,307 @@
+import concat from 'lodash/concat'
+import countBy from 'lodash/countBy'
+import diff from 'lodash/difference'
+import findIndex from 'lodash/findIndex'
+import flatten from 'lodash/flatten'
+import highland from 'highland'
+import includes from 'lodash/includes'
+import isObject from 'lodash/isObject'
+import keys from 'lodash/keys'
+import mapValues from 'lodash/mapValues'
+import pick from 'lodash/pick'
+import remove from 'lodash/remove'
+import synchronized from 'decorator-synchronized'
+import { noSuchObject } from 'xo-common/api-errors'
+import { fromCallback } from 'promise-toolbox'
+
+import {
+  forEach,
+  generateUnsecureToken,
+  isEmpty,
+  lightSet,
+  mapToArray,
+  streamToArray,
+  throwFn
+} from '../utils'
+
+// ===================================================================
+
+const normalize = ({
+  addresses,
+  id = throwFn('id is a required field'),
+  name = '',
+  networks,
+  resourceSets
+}) => ({
+  addresses,
+  id,
+  name,
+  networks,
+  resourceSets
+})
+
+const _isAddressInIpPool = (address, network, ipPool) => (
+  ipPool.addresses && (address in ipPool.addresses) &&
+  includes(ipPool.networks, isObject(network) ? network.id : network)
+)
+
+// ===================================================================
+
+// Note: an address cannot be in two different pools sharing a
+// network.
+export default class IpPools {
+  constructor (xo) {
+    this._store = null
+    this._xo = xo
+
+    xo.on('start', async () => {
+      this._store = await xo.getStore('ipPools')
+
+      xo.addConfigManager('ipPools',
+        () => this.getAllIpPools(),
+        ipPools => Promise.all(mapToArray(ipPools, ipPool => this._save(ipPool)))
+      )
+    })
+  }
+
+  async createIpPool ({ addresses, name, networks }) {
+    const id = await this._generateId()
+
+    await this._save({
+      addresses,
+      id,
+      name,
+      networks
+    })
+
+    return id
+  }
+
+  async deleteIpPool (id) {
+    const store = this._store
+
+    if (await store.has(id)) {
+      await Promise.all(mapToArray(await this._xo.getAllResourceSets(), async set => {
+        await this._xo.removeLimitFromResourceSet(`ipPool:${id}`, set.id)
+        return this._xo.removeIpPoolFromResourceSet(id, set.id)
+      }))
+      await this._removeIpAddressesFromVifs(
+        mapValues((await this.getIpPool(id)).addresses, 'vifs')
+      )
+
+      return store.del(id)
+    }
+
+    throw noSuchObject(id, 'ipPool')
+  }
+
+  _getAllIpPools (filter) {
+    return streamToArray(this._store.createValueStream(), {
+      filter,
+      mapper: normalize
+    })
+  }
+
+  async getAllIpPools (userId) {
+    let filter
+    if (userId != null) {
+      const user = await this._xo.getUser(userId)
+      if (user.permission !== 'admin') {
+        const resourceSets = await this._xo.getAllResourceSets(userId)
+        const ipPools = lightSet(flatten(mapToArray(resourceSets, 'ipPools')))
+        filter = ({ id }) => ipPools.has(id)
+      }
+    }
+
+    return this._getAllIpPools(filter)
+  }
+
+  getIpPool (id) {
+    return this._store.get(id).then(normalize, error => {
+      throw error.notFound ? noSuchObject(id, 'ipPool') : error
+    })
+  }
+
+  async _getAddressIpPool (address, network) {
+    const ipPools = await this._getAllIpPools(ipPool => _isAddressInIpPool(address, network, ipPool))
+
+    return ipPools && ipPools[0]
+  }
+
+  // Returns a map that indicates how many IPs from each IP pool the VM uses
+  // e.g.: { 'ipPool:abc': 3, 'ipPool:xyz': 7 }
+  async computeVmIpPoolsUsage (vm) {
+    const vifs = vm.VIFs
+    const ipPools = []
+    for (const vifId of vifs) {
+      const { allowedIpv4Addresses, allowedIpv6Addresses, $network } = this._xo.getObject(vifId)
+
+      for (const address of concat(allowedIpv4Addresses, allowedIpv6Addresses)) {
+        const ipPool = await this._getAddressIpPool(address, $network)
+        ipPool && ipPools.push(ipPool.id)
+      }
+    }
+
+    return countBy(ipPools, ({ id }) => `ipPool:${id}`)
+  }
+
+  @synchronized
+  allocIpAddresses (vifId, addAddresses, removeAddresses) {
+    const updatedIpPools = {}
+    const limits = {}
+
+    const xoVif = this._xo.getObject(vifId)
+    const xapi = this._xo.getXapi(xoVif)
+    const vif = xapi.getObject(xoVif._xapiId)
+
+    const allocAndSave = (() => {
+      const resourseSetId = xapi.xo.getData(vif.VM, 'resourceSet')
+
+      return () => {
+        const saveIpPools = () => Promise.all(mapToArray(updatedIpPools, ipPool => this._save(ipPool)))
+        return resourseSetId
+          ? this._xo.allocateLimitsInResourceSet(limits, resourseSetId).then(
+              saveIpPools
+            )
+          : saveIpPools()
+      }
+    })()
+
+    return fromCallback(cb => {
+      const network = vif.$network
+      const networkId = network.$id
+
+      const isVif = id => id === vifId
+
+      highland(this._store.createValueStream()).each(ipPool => {
+        const { addresses, networks } = updatedIpPools[ipPool.id] || ipPool
+        if (!(addresses && networks && includes(networks, networkId))) {
+          return false
+        }
+
+        let allocations = 0
+        let changed = false
+        forEach(removeAddresses, address => {
+          let vifs, i
+          if (
+            (vifs = addresses[address]) &&
+            (vifs = vifs.vifs) &&
+            (i = findIndex(vifs, isVif)) !== -1
+          ) {
+            vifs.splice(i, 1)
+            --allocations
+            changed = true
+          }
+        })
+        forEach(addAddresses, address => {
+          const data = addresses[address]
+          if (!data) {
+            return
+          }
+          const vifs = data.vifs || (data.vifs = [])
+          if (!includes(vifs, vifId)) {
+            vifs.push(vifId)
+            ++allocations
+            changed = true
+          }
+        })
+
+        if (changed) {
+          const { id } = ipPool
+          updatedIpPools[id] = ipPool
+          limits[`ipPool:${id}`] = (limits[`ipPool:${id}`] || 0) + allocations
+        }
+      }).toCallback(cb)
+    }).then(allocAndSave)
+  }
+
+  async _removeIpAddressesFromVifs (mapAddressVifs) {
+    const mapVifAddresses = {}
+    forEach(mapAddressVifs, (vifs, address) => {
+      forEach(vifs, vifId => {
+        if (mapVifAddresses[vifId]) {
+          mapVifAddresses[vifId].push(address)
+        } else {
+          mapVifAddresses[vifId] = [ address ]
+        }
+      })
+    })
+
+    const { getXapi } = this._xo
+    return Promise.all(mapToArray(mapVifAddresses, (addresses, vifId) => {
+      let vif
+      try {
+        // The IP may not have been correctly deallocated from the IP pool when the VIF was deleted
+        vif = this._xo.getObject(vifId)
+      } catch (error) {
+        return
+      }
+      const { allowedIpv4Addresses, allowedIpv6Addresses } = vif
+      remove(allowedIpv4Addresses, address => includes(addresses, address))
+      remove(allowedIpv6Addresses, address => includes(addresses, address))
+      this.allocIpAddresses(vifId, undefined, concat(allowedIpv4Addresses, allowedIpv6Addresses))
+
+      return getXapi(vif).editVif(vif._xapiId, {
+        ipv4Allowed: allowedIpv4Addresses,
+        ipv6Allowed: allowedIpv6Addresses
+      })
+    }))
+  }
+
+  async updateIpPool (id, {
+    addresses,
+    name,
+    networks,
+    resourceSets
+  }) {
+    const ipPool = await this.getIpPool(id)
+    const previousAddresses = { ...ipPool.addresses }
+
+    name != null && (ipPool.name = name)
+    if (addresses) {
+      const addresses_ = ipPool.addresses || {}
+      forEach(addresses, (props, address) => {
+        if (props === null) {
+          delete addresses_[address]
+        } else {
+          addresses_[address] = props
+        }
+      })
+
+      // Remove the addresses that are no longer in the IP pool from the concerned VIFs
+      const deletedAddresses = diff(keys(previousAddresses), keys(addresses_))
+      await this._removeIpAddressesFromVifs(pick(previousAddresses, deletedAddresses))
+
+      if (isEmpty(addresses_)) {
+        delete ipPool.addresses
+      } else {
+        ipPool.addresses = addresses_
+      }
+    }
+
+    // TODO: Implement patching like for addresses.
+    if (networks) {
+      ipPool.networks = networks
+    }
+
+    // TODO: Implement patching like for addresses.
+    if (resourceSets) {
+      ipPool.resourceSets = resourceSets
+    }
+
+    await this._save(ipPool)
+  }
+
+  async _generateId () {
+    let id
+    do {
+      id = generateUnsecureToken(8)
+    } while (await this._store.has(id))
+    return id
+  }
+
+  _save (ipPool) {
+    ipPool = normalize(ipPool)
+    return this._store.put(ipPool.id, ipPool)
+  }
+}
--- a/src/xo-mixins/jobs.js
+++ b/src/xo-mixins/jobs.js
@@ -1,29 +1,29 @@
 import assign from 'lodash/assign'
+
 import JobExecutor from '../job-executor'
 import { Jobs } from '../models/job'
-import {
-  GenericError,
-  NoSuchObject
-} from '../api-errors'
-
-// ===================================================================
-
-class NoSuchJob extends NoSuchObject {
-  constructor (id) {
-    super(id, 'job')
-  }
-}
+import { mapToArray } from '../utils'
+import { noSuchObject } from 'xo-common/api-errors'

 // ===================================================================

 export default class {
  constructor (xo) {
    this._executor = new JobExecutor(xo)
-    this._jobs = new Jobs({
+    const jobsDb = this._jobs = new Jobs({
      connection: xo._redis,
      prefix: 'xo:job',
      indexes: ['user_id', 'key']
    })
+
+    xo.on('start', () => {
+      xo.addConfigManager('jobs',
+        () => jobsDb.get(),
+        jobs => Promise.all(mapToArray(jobs, job =>
+          jobsDb.save(job)
+        ))
+      )
+    })
  }

  async getAllJobs () {
@@ -33,22 +33,27 @@ export default class {
  async getJob (id) {
    const job = await this._jobs.first(id)
    if (!job) {
-      throw new NoSuchJob(id)
+      throw noSuchObject(id, 'job')
    }

    return job.properties
  }

-  async createJob (userId, job) {
+  async createJob (job) {
    // TODO: use plain objects
-    const job_ = await this._jobs.create(userId, job)
+    const job_ = await this._jobs.create(job)
    return job_.properties
  }

-  async updateJob ({id, type, name, key, method, paramsVector}) {
-    const oldJob = await this.getJob(id)
-    assign(oldJob, {type, name, key, method, paramsVector})
-    return /* await */ this._jobs.save(oldJob)
+  async updateJob ({id, ...props}) {
+    const job = await this.getJob(id)
+
+    assign(job, props)
+    if (job.timeout === null) {
+      delete job.timeout
+    }
+
+    return /* await */ this._jobs.save(job)
  }

  async removeJob (id) {
@@ -56,24 +61,10 @@ export default class {
  }

  async runJobSequence (idSequence) {
-    const notFound = []
-    for (const id of idSequence) {
-      let job
-      try {
-        job = await this.getJob(id)
-      } catch (error) {
-        if (error instanceof NoSuchJob) {
-          notFound.push(id)
-        } else {
-          throw error
-        }
-      }
-      if (job) {
-        await this._executor.exec(job)
-      }
-    }
-    if (notFound.length > 0) {
-      throw new GenericError(`The following jobs were not found: ${notFound.join()}`)
+    const jobs = await Promise.all(mapToArray(idSequence, id => this.getJob(id)))
+
+    for (const job of jobs) {
+      await this._executor.exec(job)
    }
  }
 }
--- a/src/xo-mixins/plugins.js
+++ b/src/xo-mixins/plugins.js
@@ -2,9 +2,9 @@ import createJsonSchemaValidator from 'is-my-json-valid'

 import { PluginsMetadata } from '../models/plugin-metadata'
 import {
-  InvalidParameters,
-  NoSuchObject
-} from '../api-errors'
+  invalidParameters,
+  noSuchObject
+} from 'xo-common/api-errors'
 import {
  createRawObject,
  isFunction,
@@ -13,14 +13,6 @@ import {

 // ===================================================================

-class NoSuchPlugin extends NoSuchObject {
-  constructor (id) {
-    super(id, 'plugin')
-  }
-}
-
-// ===================================================================
-
 export default class {
  constructor (xo) {
    this._plugins = createRawObject()
@@ -29,12 +21,21 @@ export default class {
      connection: xo._redis,
      prefix: 'xo:plugin-metadata'
    })
+
+    xo.on('start', () => {
+      xo.addConfigManager('plugins',
+        () => this._pluginsMetadata.get(),
+        plugins => Promise.all(mapToArray(plugins, plugin =>
+          this._pluginsMetadata.save(plugin)
+        ))
+      )
+    })
  }

  _getRawPlugin (id) {
    const plugin = this._plugins[id]
    if (!plugin) {
-      throw new NoSuchPlugin(id)
+      throw noSuchObject(id, 'plugin')
    }
    return plugin
  }
@@ -51,16 +52,21 @@ export default class {
    instance,
    configurationSchema,
    configurationPresets,
+    description,
+    testSchema,
    version
  ) {
    const id = name
    const plugin = this._plugins[id] = {
-      configured: !configurationSchema,
      configurationPresets,
      configurationSchema,
+      configured: !configurationSchema,
+      description,
      id,
      instance,
      name,
+      testable: isFunction(instance.test),
+      testSchema,
      unloadable: isFunction(instance.unload),
      version
    }
@@ -68,7 +74,6 @@ export default class {
    const metadata = await this._getPluginMetadata(id)
    let autoload = true
    let configuration
-
    if (metadata) {
      ({
        autoload,
@@ -97,7 +102,7 @@ export default class {
        }
      })
      .catch(error => {
-        console.error('register plugin %s: %s', name, error && error.stack || error)
+        console.error('register plugin %s: %s', name, (error && error.stack) || error)
      })
  }

@@ -105,8 +110,11 @@ export default class {
    const {
      configurationPresets,
      configurationSchema,
+      description,
      loaded,
      name,
+      testable,
+      testSchema,
      unloadable,
      version
    } = this._getRawPlugin(id)
@@ -119,12 +127,15 @@ export default class {
      id,
      name,
      autoload,
+      description,
      loaded,
      unloadable,
      version,
      configuration,
      configurationPresets,
-      configurationSchema
+      configurationSchema,
+      testable,
+      testSchema
    }
  }

@@ -139,12 +150,12 @@ export default class {
    const { configurationSchema } = plugin

    if (!configurationSchema) {
-      throw new InvalidParameters('plugin not configurable')
+      throw invalidParameters('plugin not configurable')
    }

    // See: https://github.com/mafintosh/is-my-json-valid/issues/116
    if (configuration == null) {
-      throw new InvalidParameters([{
+      throw invalidParameters([{
        field: 'data',
        message: 'is the wrong type'
      }])
@@ -152,7 +163,7 @@ export default class {

    const validate = createJsonSchemaValidator(configurationSchema)
    if (!validate(configuration)) {
-      throw new InvalidParameters(validate.errors)
+      throw invalidParameters(validate.errors)
    }

    // Sets the plugin configuration.
@@ -191,11 +202,11 @@ export default class {
  async loadPlugin (id) {
    const plugin = this._getRawPlugin(id)
    if (plugin.loaded) {
-      throw new InvalidParameters('plugin already loaded')
+      throw invalidParameters('plugin already loaded')
    }

    if (!plugin.configured) {
-      throw new InvalidParameters('plugin not configured')
+      throw invalidParameters('plugin not configured')
    }

    await plugin.instance.load()
@@ -205,11 +216,11 @@ export default class {
  async unloadPlugin (id) {
    const plugin = this._getRawPlugin(id)
    if (!plugin.loaded) {
-      throw new InvalidParameters('plugin already unloaded')
+      throw invalidParameters('plugin already unloaded')
    }

    if (plugin.unloadable === false) {
-      throw new InvalidParameters('plugin cannot be unloaded')
+      throw invalidParameters('plugin cannot be unloaded')
    }

    await plugin.instance.unload()
@@ -219,4 +230,31 @@ export default class {
  async purgePluginConfiguration (id) {
    await this._pluginsMetadata.merge(id, { configuration: undefined })
  }
+
+  async testPlugin (id, data) {
+    const plugin = this._getRawPlugin(id)
+    if (!plugin.testable) {
+      throw invalidParameters('plugin not testable')
+    }
+    if (!plugin.loaded) {
+      throw invalidParameters('plugin not loaded')
+    }
+
+    const { testSchema } = plugin
+    if (testSchema) {
+      if (data == null) {
+        throw invalidParameters([{
+          field: 'data',
+          message: 'is the wrong type'
+        }])
+      }
+
+      const validate = createJsonSchemaValidator(testSchema)
+      if (!validate(data)) {
+        throw invalidParameters(validate.errors)
+      }
+    }
+
+    await plugin.instance.test(data)
+  }
 }
--- a/src/xo-mixins/remotes.js
+++ b/src/xo-mixins/remotes.js
@@ -1,26 +1,18 @@
+import { noSuchObject } from 'xo-common/api-errors'
+
 import RemoteHandlerLocal from '../remote-handlers/local'
 import RemoteHandlerNfs from '../remote-handlers/nfs'
 import RemoteHandlerSmb from '../remote-handlers/smb'
 import {
-  forEach
+  forEach,
+  mapToArray
 } from '../utils'
-import {
-  NoSuchObject
-} from '../api-errors'
 import {
  Remotes
 } from '../models/remote'

 // ===================================================================

-class NoSuchRemote extends NoSuchObject {
-  constructor (id) {
-    super(id, 'remote')
-  }
-}
-
-// ===================================================================
-
 export default class {
  constructor (xo) {
    this._remotes = new Remotes({
@@ -30,17 +22,29 @@ export default class {
    })

    xo.on('start', async () => {
+      xo.addConfigManager('remotes',
+        () => this._remotes.get(),
+        remotes => Promise.all(mapToArray(remotes, remote =>
+          this._remotes.save(remote)
+        ))
+      )
+
      await this.initRemotes()
      await this.syncAllRemotes()
    })
    xo.on('stop', () => this.forgetAllRemotes())
  }

-  async getRemoteHandler (remote) {
+  async getRemoteHandler (remote, ignoreDisabled) {
    if (typeof remote === 'string') {
      remote = await this.getRemote(remote)
    }
-    const Handler = {
+
+    if (!(ignoreDisabled || remote.enabled)) {
+      throw new Error('remote is disabled')
+    }
+
+    const HANDLERS = {
      file: RemoteHandlerLocal,
      smb: RemoteHandlerSmb,
      nfs: RemoteHandlerNfs
@@ -48,14 +52,16 @@ export default class {

    // FIXME: should be done in xo-remote-parser.
    const type = remote.url.split('://')[0]
-    if (!Handler[type]) {
+
+    const Handler = HANDLERS[type]
+    if (!Handler) {
      throw new Error('Unhandled remote type')
    }
-    return new Handler[type](remote)
+    return new Handler(remote)
  }

  async testRemote (remote) {
-    const handler = await this.getRemoteHandler(remote)
+    const handler = await this.getRemoteHandler(remote, true)
    return handler.test()
  }

@@ -66,7 +72,7 @@ export default class {
  async _getRemote (id) {
    const remote = await this._remotes.first(id)
    if (!remote) {
-      throw new NoSuchRemote(id)
+      throw noSuchObject(id, 'remote')
    }

    return remote
@@ -84,7 +90,7 @@ export default class {
  async updateRemote (id, {name, url, enabled, error}) {
    const remote = await this._getRemote(id)
    this._updateRemote(remote, {name, url, enabled, error})
-    const handler = await this.getRemoteHandler(remote.properties)
+    const handler = await this.getRemoteHandler(remote.properties, true)
    const props = await handler.sync()
    this._updateRemote(remote, props)
    return (await this._remotes.save(remote)).properties
@@ -102,7 +108,7 @@ export default class {
  }

  async removeRemote (id) {
-    const handler = await this.getRemoteHandler(id)
+    const handler = await this.getRemoteHandler(id, true)
    await handler.forget()
    await this._remotes.remove(id)
  }
@@ -120,7 +126,7 @@ export default class {
    const remotes = await this.getAllRemotes()
    for (let remote of remotes) {
      try {
-        (await this.getRemoteHandler(remote)).forget()
+        (await this.getRemoteHandler(remote, true)).forget()
      } catch (_) {}
    }
  }
--- a/src/xo-mixins/resource-sets.js
+++ b/src/xo-mixins/resource-sets.js
@@ -2,11 +2,12 @@ import every from 'lodash/every'
 import keyBy from 'lodash/keyBy'
 import remove from 'lodash/remove'
 import some from 'lodash/some'
-
+import synchronized from 'decorator-synchronized'
 import {
-  NoSuchObject,
-  Unauthorized
-} from '../api-errors'
+  noSuchObject,
+  unauthorized
+} from 'xo-common/api-errors'
+
 import {
  forEach,
  generateUnsecureToken,
@@ -19,10 +20,12 @@ import {

 // ===================================================================

-class NoSuchResourceSet extends NoSuchObject {
-  constructor (id) {
-    super(id, 'resource set')
-  }
+const VM_RESOURCES = {
+  cpus: true,
+  disk: true,
+  disks: true,
+  memory: true,
+  vms: true
 }

 const computeVmResourcesUsage = vm => {
@@ -54,6 +57,7 @@ const computeVmResourcesUsage = vm => {

 const normalize = set => ({
  id: set.id,
+  ipPools: set.ipPools || [],
  limits: set.limits
    ? map(set.limits, limit => isObject(limit)
      ? limit
@@ -76,6 +80,13 @@ export default class {

    this._store = null
    xo.on('start', async () => {
+      xo.addConfigManager('resourceSets',
+        () => this.getAllResourceSets(),
+        resourceSets => Promise.all(mapToArray(resourceSets, resourceSet =>
+          this._save(resourceSet)
+        ))
+      )
+
      this._store = await xo.getStore('resourceSets')
    })
  }
@@ -108,7 +119,7 @@ export default class {
      // The set does not contains ALL objects.
      !every(objectIds, lightSet(set.objects).has)
    )) {
-      throw new Unauthorized()
+      throw unauthorized()
    }
  }

@@ -140,14 +151,15 @@ export default class {
      return store.del(id)
    }

-    throw new NoSuchResourceSet(id)
+    throw noSuchObject(id, 'resourceSet')
  }

  async updateResourceSet (id, {
    name = undefined,
    subjects = undefined,
    objects = undefined,
-    limits = undefined
+    limits = undefined,
+    ipPools = undefined
  }) {
    const set = await this.getResourceSet(id)
    if (name) {
@@ -178,6 +190,9 @@ export default class {
        }
      })
    }
+    if (ipPools) {
+      set.ipPools = ipPools
+    }

    await this._save(set)
  }
@@ -203,7 +218,7 @@ export default class {
  getResourceSet (id) {
    return this._store.get(id).then(normalize, error => {
      if (error.notFound) {
-        throw new NoSuchResourceSet(id)
+        throw noSuchObject(id, 'resourceSet')
      }

      throw error
@@ -218,7 +233,19 @@ export default class {

  async removeObjectFromResourceSet (objectId, setId) {
    const set = await this.getResourceSet(setId)
-    remove(set.objects)
+    remove(set.objects, id => id === objectId)
+    await this._save(set)
+  }
+
+  async addIpPoolToResourceSet (ipPoolId, setId) {
+    const set = await this.getResourceSet(setId)
+    set.ipPools.push(ipPoolId)
+    await this._save(set)
+  }
+
+  async removeIpPoolFromResourceSet (ipPoolId, setId) {
+    const set = await this.getResourceSet(setId)
+    remove(set.ipPools, id => id === ipPoolId)
    await this._save(set)
  }

@@ -230,7 +257,7 @@ export default class {

  async removeSubjectToResourceSet (subjectId, setId) {
    const set = await this.getResourceSet(setId)
-    remove(set.subjects, subjectId)
+    remove(set.subjects, id => id === subjectId)
    await this._save(set)
  }

@@ -246,6 +273,7 @@ export default class {
    await this._save(set)
  }

+  @synchronized
  async allocateLimitsInResourceSet (limits, setId) {
    const set = await this.getResourceSet(setId)
    forEach(limits, (quantity, id) => {
@@ -261,6 +289,7 @@ export default class {
    await this._save(set)
  }

+  @synchronized
  async releaseLimitsInResourceSet (limits, setId) {
    const set = await this.getResourceSet(setId)
    forEach(limits, (quantity, id) => {
@@ -280,7 +309,9 @@ export default class {
    const sets = keyBy(await this.getAllResourceSets(), 'id')
    forEach(sets, ({ limits }) => {
      forEach(limits, (limit, id) => {
-        limit.available = limit.total
+        if (VM_RESOURCES[id]) { // only reset VMs related limits
+          limit.available = limit.total
+        }
      })
    })

--- a/src/xo-mixins/scheduling.js
+++ b/src/xo-mixins/scheduling.js
@@ -1,9 +1,10 @@
 import { BaseError } from 'make-error'
-import { NoSuchObject } from '../api-errors.js'
-import { Schedules } from '../models/schedule'
+import { noSuchObject } from 'xo-common/api-errors.js'

+import { Schedules } from '../models/schedule'
 import {
  forEach,
+  mapToArray,
  scheduleFn
 } from '../utils'

@@ -19,15 +20,9 @@ export class ScheduleOverride extends SchedulerError {
  }
 }

-export class NoSuchSchedule extends NoSuchObject {
-  constructor (scheduleOrId) {
-    super(scheduleOrId, 'schedule')
-  }
-}
-
 export class ScheduleNotEnabled extends SchedulerError {
  constructor (scheduleOrId) {
-    super('Schedule ' + _resolveId(scheduleOrId)) + ' is not enabled'
+    super('Schedule ' + _resolveId(scheduleOrId) + ' is not enabled')
  }
 }

@@ -42,14 +37,23 @@ export class ScheduleAlreadyEnabled extends SchedulerError {
 export default class {
  constructor (xo) {
    this.xo = xo
-    this._redisSchedules = new Schedules({
+    const schedules = this._redisSchedules = new Schedules({
      connection: xo._redis,
      prefix: 'xo:schedule',
      indexes: ['user_id', 'job']
    })
    this._scheduleTable = undefined

-    xo.on('start', () => this._loadSchedules())
+    xo.on('start', () => {
+      xo.addConfigManager('schedules',
+        () => schedules.get(),
+        schedules_ => Promise.all(mapToArray(schedules_, schedule =>
+          schedules.save(schedule)
+        ))
+      )
+
+      return this._loadSchedules()
+    })
    xo.on('stop', () => this._disableAll())
  }

@@ -86,7 +90,7 @@ export default class {

  _disable (scheduleOrId) {
    if (!this._exists(scheduleOrId)) {
-      throw new NoSuchSchedule(scheduleOrId)
+      throw noSuchObject(scheduleOrId, 'schedule')
    }
    if (!this._isEnabled(scheduleOrId)) {
      throw new ScheduleNotEnabled(scheduleOrId)
@@ -125,7 +129,7 @@ export default class {
    const schedule = await this._redisSchedules.first(id)

    if (!schedule) {
-      throw new NoSuchSchedule(id)
+      throw noSuchObject(id, 'schedule')
    }

    return schedule
@@ -166,7 +170,7 @@ export default class {
    const { properties } = schedule

    if (!this._exists(properties)) {
-      throw new NoSuchSchedule(properties)
+      throw noSuchObject(properties, 'schedule')
    }

    if (this._isEnabled(properties)) {
@@ -182,7 +186,7 @@ export default class {
    try {
      this._disable(id)
    } catch (exc) {
-      if (!exc instanceof SchedulerError) {
+      if (!(exc instanceof SchedulerError)) {
        throw exc
      }
    } finally {
--- a/src/xo-mixins/store.js
+++ b/src/xo-mixins/store.js
@@ -54,7 +54,7 @@ const levelPromise = db => {
      dbP[name] = db::value
    } else {
      dbP[`${name}Sync`] = db::value
-      dbP[name] = value::promisify(db)
+      dbP[name] = promisify(value, db)
    }
  })

--- a/src/xo-mixins/subjects.js
+++ b/src/xo-mixins/subjects.js
@@ -5,11 +5,11 @@ import {
  needsRehash,
  verify
 } from 'hashy'
-
 import {
-  InvalidCredential,
-  NoSuchObject
-} from '../api-errors'
+  invalidCredentials,
+  noSuchObject
+} from 'xo-common/api-errors'
+
 import {
  Groups
 } from '../models/group'
@@ -27,18 +27,6 @@ import {

 // ===================================================================

-class NoSuchGroup extends NoSuchObject {
-  constructor (id) {
-    super(id, 'group')
-  }
-}
-
-class NoSuchUser extends NoSuchObject {
-  constructor (id) {
-    super(id, 'user')
-  }
-}
-
 const addToArraySet = (set, value) => set && !includes(set, value)
  ? set.concat(value)
  : [ value ]
@@ -52,22 +40,40 @@ export default class {

    const redis = xo._redis

-    this._groups = new Groups({
+    const groupsDb = this._groups = new Groups({
      connection: redis,
      prefix: 'xo:group'
    })
-    const users = this._users = new Users({
+    const usersDb = this._users = new Users({
      connection: redis,
      prefix: 'xo:user',
      indexes: ['email']
    })

    xo.on('start', async () => {
-      if (!await users.exists()) {
+      xo.addConfigManager('groups',
+        () => groupsDb.get(),
+        groups => Promise.all(mapToArray(groups, group => groupsDb.save(group)))
+      )
+      xo.addConfigManager('users',
+        () => usersDb.get(),
+        users => Promise.all(mapToArray(users, async user => {
+          const userId = user.id
+          const conflictUsers = await usersDb.get({ email: user.email })
+          if (!isEmpty(conflictUsers)) {
+            await Promise.all(mapToArray(conflictUsers, ({ id }) =>
+              (id !== userId) && this.deleteUser(user.id)
+            ))
+          }
+          return usersDb.save(user)
+        }))
+      )
+
+      if (!await usersDb.exists()) {
        const email = 'admin@admin.net'
        const password = 'admin'

-        await this.createUser(email, {password, permission: 'admin'})
+        await this.createUser({email, password, permission: 'admin'})
        console.log('[INFO] Default user created:', email, ' with password', password)
      }
    })
@@ -75,13 +81,17 @@ export default class {

  // -----------------------------------------------------------------

-  async createUser (email, { password, ...properties }) {
+  async createUser ({ name, password, ...properties }) {
+    if (name) {
+      properties.email = name
+    }
+
    if (password) {
      properties.pw_hash = await hash(password)
    }

    // TODO: use plain objects
-    const user = await this._users.create(email, properties)
+    const user = await this._users.create(properties)

    return user.properties
  }
@@ -95,12 +105,18 @@ export default class {
    this._xo.getAuthenticationTokensForUser(id)
      .then(tokens => {
        forEach(tokens, token => {
-          this._xo._tokens.remove(token.id)
-            ::pCatch(noop)
+          this._xo.deleteAuthenticationToken(id)::pCatch(noop)
        })
      })
      ::pCatch(noop) // Ignore any failures.

+    // Remove ACLs for this user.
+    this._xo.getAclsForSubject(id).then(acls => {
+      forEach(acls, acl => {
+        this._xo.removeAcl(id, acl.object, acl.action)::pCatch(noop)
+      })
+    })
+
    // Remove the user from all its groups.
    forEach(user.groups, groupId => {
      this.getGroup(groupId)
@@ -153,7 +169,7 @@ export default class {
  async _getUser (id) {
    const user = await this._users.first(id)
    if (!user) {
-      throw new NoSuchUser(id)
+      throw noSuchObject(id, 'user')
    }

    return user
@@ -186,7 +202,7 @@ export default class {
      return null
    }

-    throw new NoSuchUser(username)
+    throw noSuchObject(username, 'user')
  }

  // Get or create a user associated with an auth provider.
@@ -204,14 +220,15 @@ export default class {
      throw new Error(`registering ${name} user is forbidden`)
    }

-    return /* await */ this.createUser(name, {
+    return /* await */ this.createUser({
+      name,
      _provider: provider
    })
  }

  async changeUserPassword (userId, oldPassword, newPassword) {
    if (!(await this.checkUserPassword(userId, oldPassword, false))) {
-      throw new InvalidCredential()
+      throw invalidCredentials()
    }

    await this.updateUser(userId, { password: newPassword })
@@ -239,7 +256,6 @@ export default class {
    // TODO: use plain objects.
    const group = (await this._groups.create(name)).properties

-    group.users = JSON.parse(group.users)
    return group
  }

@@ -248,6 +264,13 @@ export default class {

    await this._groups.remove(id)

+    // Remove ACLs for this group.
+    this._xo.getAclsForSubject(id).then(acls => {
+      forEach(acls, acl => {
+        this._xo.removeAcl(id, acl.object, acl.action)::pCatch(noop)
+      })
+    })
+
    // Remove the group from all its users.
    forEach(group.users, userId => {
      this.getUser(userId)
@@ -267,7 +290,7 @@ export default class {
  async getGroup (id) {
    const group = await this._groups.first(id)
    if (!group) {
-      throw new NoSuchGroup(id)
+      throw noSuchObject(id, 'group')
    }

    return group.properties
@@ -323,7 +346,7 @@ export default class {
      if (newUsersIds.has(id)) {
        newUsersIds.delete(id)
      } else {
-        oldUsers.push(id)
+        oldUsersIds.push(id)
      }
    })
    newUsersIds = newUsersIds.toArray()
--- a/src/xo-mixins/xen-servers.js
+++ b/src/xo-mixins/xen-servers.js
@@ -1,10 +1,8 @@
+import { noSuchObject } from 'xo-common/api-errors'
+
 import Xapi from '../xapi'
 import xapiObjectToXo from '../xapi-object-to-xo'
 import XapiStats from '../xapi-stats'
-import {
-  GenericError,
-  NoSuchObject
-} from '../api-errors'
 import {
  camelToSnakeCase,
  createRawObject,
@@ -13,7 +11,8 @@ import {
  isString,
  noop,
  pCatch,
-  popProperty
+  popProperty,
+  serializeError
 } from '../utils'
 import {
  Servers
@@ -21,18 +20,10 @@ import {

 // ===================================================================

-class NoSuchXenServer extends NoSuchObject {
-  constructor (id) {
-    super(id, 'xen server')
-  }
-}
-
-// ===================================================================
-
 export default class {
  constructor (xo) {
    this._objectConflicts = createRawObject() // TODO: clean when a server is disconnected.
-    this._servers = new Servers({
+    const serversDb = this._servers = new Servers({
      connection: xo._redis,
      prefix: 'xo:server',
      indexes: ['host']
@@ -43,8 +34,13 @@ export default class {
    this._xo = xo

    xo.on('start', async () => {
+      xo.addConfigManager('xenServers',
+        () => serversDb.get(),
+        servers => serversDb.update(servers)
+      )
+
      // Connects to existing servers.
-      const servers = await this._servers.get()
+      const servers = await serversDb.get()
      for (let server of servers) {
        if (server.enabled) {
          this.connectXenServer(server.id).catch(error => {
@@ -60,11 +56,12 @@ export default class {
    // TODO: disconnect servers on stop.
  }

-  async registerXenServer ({host, username, password, readOnly = false}) {
+  async registerXenServer ({label, host, username, password, readOnly = false}) {
    // FIXME: We are storing passwords which is bad!
    //        Could we use tokens instead?
    // TODO: use plain objects
    const server = await this._servers.create({
+      label: label || undefined,
      host,
      username,
      password,
@@ -79,17 +76,22 @@ export default class {
    this.disconnectXenServer(id)::pCatch(noop)

    if (!await this._servers.remove(id)) {
-      throw new NoSuchXenServer(id)
+      throw noSuchObject(id, 'xenServer')
    }
  }

-  async updateXenServer (id, {host, username, password, readOnly, enabled}) {
+  async updateXenServer (id, {label, host, username, password, readOnly, enabled, error}) {
    const server = await this._getXenServer(id)

+    if (label !== undefined) server.set('label', label || undefined)
    if (host) server.set('host', host)
    if (username) server.set('username', username)
    if (password) server.set('password', password)

+    if (error !== undefined) {
+      server.set('error', error ? JSON.stringify(error) : '')
+    }
+
    if (enabled !== undefined) {
      server.set('enabled', enabled ? 'true' : undefined)
    }
@@ -110,7 +112,7 @@ export default class {
  async _getXenServer (id) {
    const server = await this._servers.first(id)
    if (!server) {
-      throw new NoSuchXenServer(id)
+      throw noSuchObject(id, 'xenServer')
    }

    return server
@@ -283,23 +285,20 @@ export default class {

    xapi.xo.install()

-    try {
-      await xapi.connect()
-    } catch (error) {
-      if (error.code === 'SESSION_AUTHENTICATION_FAILED') {
-        throw new GenericError('authentication failed')
+    await xapi.connect().then(
+      () => this.updateXenServer(id, { error: null }),
+      error => {
+        this.updateXenServer(id, { error: serializeError(error) })
+
+        throw error
      }
-      if (error.code === 'EHOSTUNREACH') {
-        throw new GenericError('host unreachable')
-      }
-      throw error
-    }
+    )
  }

  async disconnectXenServer (id) {
    const xapi = this._xapis[id]
    if (!xapi) {
-      throw new NoSuchXenServer(id)
+      throw noSuchObject(id, 'xenServer')
    }

    delete this._xapis[id]
--- a/src/xo.js
+++ b/src/xo.js
@@ -3,6 +3,7 @@ import XoCollection from 'xo-collection'
 import XoUniqueIndex from 'xo-collection/unique-index'
 import {createClient as createRedisClient} from 'redis'
 import {EventEmitter} from 'events'
+import { noSuchObject } from 'xo-common/api-errors'

 import mixins from './xo-mixins'
 import Connection from './connection'
@@ -20,9 +21,6 @@ import {
  mapToArray,
  noop
 } from './utils'
-import {
-  NoSuchObject
-} from './api-errors'

 // ===================================================================

@@ -31,6 +29,9 @@ export default class Xo extends EventEmitter {
  constructor (config) {
    super()

+    // a lot of mixins adds listener for start/stop/… events
+    this.setMaxListeners(0)
+
    this._config = config

    this._objects = new XoCollection()
@@ -43,7 +44,33 @@ export default class Xo extends EventEmitter {
    this._httpRequestWatchers = createRawObject()

    // Connects to Redis.
-    this._redis = createRedisClient(config.redis && config.redis.uri)
+    {
+      const {
+        renameCommands: rename_commands,
+        socket: path,
+        uri: url
+      } = config.redis || {}
+
+      this._redis = createRedisClient({ path, rename_commands, url })
+    }
+  }
+
+  // -----------------------------------------------------------------
+
+  async clean () {
+    const handleCleanError = error => {
+      console.error(
+        '[WARN] clean error:',
+        (error && error.stack) || error
+      )
+    }
+    await Promise.all(mapToArray(
+      this.listeners('clean'),
+
+      listener => new Promise(resolve => {
+        resolve(listener.call(this))
+      }).catch(handleCleanError)
+    ))
  }

  // -----------------------------------------------------------------
@@ -58,7 +85,7 @@ export default class Xo extends EventEmitter {
    const handleStartError = error => {
      console.error(
        '[WARN] start error:',
-        error && error.stack || error
+        (error && error.stack) || error
      )
    }
    await Promise.all(mapToArray(
@@ -82,7 +109,7 @@ export default class Xo extends EventEmitter {
    const handleStopError = error => {
      console.error(
        '[WARN] stop error:',
-        error && error.stack || error
+        (error && error.stack) || error
      )
    }
    await Promise.all(mapToArray(
@@ -122,14 +149,14 @@ export default class Xo extends EventEmitter {

    const obj = all[key] || byRef[key]
    if (!obj) {
-      throw new NoSuchObject(key, type)
+      throw noSuchObject(key, type)
    }

    if (type != null && (
-      isString(type) && type !== obj.type ||
+      (isString(type) && type !== obj.type) ||
      !includes(type, obj.type) // Array
    )) {
-      throw new NoSuchObject(key, type)
+      throw noSuchObject(key, type)
    }

    return obj
@@ -192,7 +219,7 @@ export default class Xo extends EventEmitter {

    const {fn, data} = watcher
    new Promise(resolve => {
-      resolve(fn(req, res, data, next))
+      resolve(fn.call(this, req, res, data, next))
    }).then(
      result => {
        if (result != null) {
@@ -255,7 +282,7 @@ export default class Xo extends EventEmitter {
  // -----------------------------------------------------------------

  // Plugins can use this method to expose methods directly on XO.
-  defineProperty (name, value) {
+  defineProperty (name, value, thisArg = null) {
    if (name in this) {
      throw new Error(`Xo#${name} is already defined`)
    }
@@ -263,7 +290,7 @@ export default class Xo extends EventEmitter {
    // For security, prevent from accessing `this`.
    if (isFunction(value)) {
      value = (value => function () {
-        return value.apply(null, arguments)
+        return value.apply(thisArg, arguments)
      })(value)
    }

@@ -279,6 +306,23 @@ export default class Xo extends EventEmitter {
    return () => unset()
  }

+  // Convenience method to define multiple properties at once.
+  defineProperties (props, thisArg) {
+    const unsets = []
+    const unset = () => forEach(unsets, unset => unset())
+
+    try {
+      forEach(props, (value, name) => {
+        unsets.push(this.defineProperty(name, value, thisArg))
+      })
+    } catch (error) {
+      unset()
+      throw error
+    }
+
+    return unset
+  }
+
  // -----------------------------------------------------------------

  // Watches objects changes.
@@ -330,7 +374,7 @@ export default class Xo extends EventEmitter {

      forEach(connections, connection => {
        // Notifies only authenticated clients.
-        if (connection.has('user_id')) {
+        if (connection.has('user_id') && connection.notify) {
          if (enteredMessage) {
            connection.notify('all', enteredMessage)
          }
--- a/tools/generate-index
+++ b/tools/generate-index
@@ -1,84 +0,0 @@
-#!/usr/bin/env node
-
-var join = require('path').join
-var readdir = require('fs').readdirSync
-var stat = require('fs').statSync
-var writeFile = require('fs').writeFileSync
-
-// ===================================================================
-
-function bind (fn, thisArg) {
-  return function () {
-    return fn.apply(thisArg, arguments)
-  }
-}
-
-function camelCase (str) {
-  return str.toLowerCase().replace(/[^a-z0-9]+([a-z0-9])/g, function (_, str) {
-    return str.toUpperCase()
-  })
-}
-
-function removeSuffix (str, sfx) {
-  var strLength = str.length
-  var sfxLength = sfx.length
-
-  var pos = strLength - sfxLength
-  if (pos < 0 || str.indexOf(sfx, pos) !== pos) {
-    return false
-  }
-
-  return str.slice(0, pos)
-}
-
-// ===================================================================
-
-function handleEntry (entry, dir) {
-  var stats = stat(join(dir, entry))
-  var base
-  if (stats.isDirectory()) {
-    base = entry
-  } else if (!(
-    stats.isFile() && (
-      (base = removeSuffix(entry, '.coffee')) ||
-      (base = removeSuffix(entry, '.js'))
-    )
-  )) {
-    return
-  }
-
-  var identifier = camelCase(base)
-  this(
-    'import ' + identifier + " from './" + base + "'",
-    'defaults.' + identifier + ' = ' + identifier,
-    'export * as ' + identifier + " from './" + base + "'",
-    ''
-  )
-}
-
-function generateIndex (dir) {
-  var content = [
-    '//',
-    '// This file has been generated by /tools/generate-index',
-    '//',
-    '// It is automatically re-generated each time a build is started.',
-    '//',
-    '',
-    'const defaults = {}',
-    'export default defaults',
-    ''
-  ]
-  var write = bind(content.push, content)
-
-  readdir(dir).map(function (entry) {
-    if (entry === 'index.js') {
-      return
-    }
-
-    handleEntry.call(write, entry, dir)
-  })
-
-  writeFile(dir + '/index.js', content.join('\n'))
-}
-
-process.argv.slice(2).map(generateIndex)
--- a/yarn.lock
+++ b/yarn.lock