fix(@xen-orchestra/backups): save the vm and vmSapshot metadata

* full and delta backup jobs are renamed to full and incremental
* inside an incremental job, the full and delta transfers are renamed to base and delta transver
* the baseVm used for computing the snapshot is renamed to comparisasonBasisVm
* split a lot of files to extract reusable methods
* use a factory to instantiates BackubJob, the Backup* classes are now private by convention
* the VmBackups class are instatiated by a XapiBackupJob => move them to the _backup folder
* the writers need a VmBackup in their constructor: move them to the vmBackup folder

@xen-orchestra/backups/Backup.js

@@ -1,307 +0,0 @@
-'use strict'
-
-const { asyncMap, asyncMapSettled } = require('@xen-orchestra/async-map')
-const Disposable = require('promise-toolbox/Disposable')
-const ignoreErrors = require('promise-toolbox/ignoreErrors')
-const pTimeout = require('promise-toolbox/timeout')
-const { compileTemplate } = require('@xen-orchestra/template')
-const { limitConcurrency } = require('limit-concurrency-decorator')
-
-const { extractIdsFromSimplePattern } = require('./extractIdsFromSimplePattern.js')
-const { PoolMetadataBackup } = require('./_PoolMetadataBackup.js')
-const { Task } = require('./Task.js')
-const { VmBackup } = require('./_VmBackup.js')
-const { XoMetadataBackup } = require('./_XoMetadataBackup.js')
-const createStreamThrottle = require('./_createStreamThrottle.js')
-
-const noop = Function.prototype
-
-const getAdaptersByRemote = adapters => {
-  const adaptersByRemote = {}
-  adapters.forEach(({ adapter, remoteId }) => {
-    adaptersByRemote[remoteId] = adapter
-  })
-  return adaptersByRemote
-}
-
-const runTask = (...args) => Task.run(...args).catch(noop) // errors are handled by logs
-
-const DEFAULT_SETTINGS = {
-  getRemoteTimeout: 300e3,
-  reportWhen: 'failure',
-}
-
-const DEFAULT_VM_SETTINGS = {
-  bypassVdiChainsCheck: false,
-  checkpointSnapshot: false,
-  concurrency: 2,
-  copyRetention: 0,
-  deleteFirst: false,
-  exportRetention: 0,
-  fullInterval: 0,
-  healthCheckSr: undefined,
-  healthCheckVmsWithTags: [],
-  maxExportRate: 0,
-  maxMergedDeltasPerRun: Infinity,
-  offlineBackup: false,
-  offlineSnapshot: false,
-  snapshotRetention: 0,
-  timeout: 0,
-  useNbd: false,
-  unconditionalSnapshot: false,
-  validateVhdStreams: false,
-  vmTimeout: 0,
-}
-
-const DEFAULT_METADATA_SETTINGS = {
-  retentionPoolMetadata: 0,
-  retentionXoMetadata: 0,
-}
-
-class RemoteTimeoutError extends Error {
-  constructor(remoteId) {
-    super('timeout while getting the remote ' + remoteId)
-    this.remoteId = remoteId
-  }
-}
-
-exports.Backup = class Backup {
-  constructor({ config, getAdapter, getConnectedRecord, job, schedule }) {
-    this._config = config
-    this._getRecord = getConnectedRecord
-    this._job = job
-    this._schedule = schedule
-
-    this._getSnapshotNameLabel = compileTemplate(config.snapshotNameLabelTpl, {
-      '{job.name}': job.name,
-      '{vm.name_label}': vm => vm.name_label,
-    })
-
-    const { type } = job
-    const baseSettings = { ...DEFAULT_SETTINGS }
-    if (type === 'backup') {
-      Object.assign(baseSettings, DEFAULT_VM_SETTINGS, config.defaultSettings, config.vm?.defaultSettings)
-      this.run = this._runVmBackup
-    } else if (type === 'metadataBackup') {
-      Object.assign(baseSettings, DEFAULT_METADATA_SETTINGS, config.defaultSettings, config.metadata?.defaultSettings)
-      this.run = this._runMetadataBackup
-    } else {
-      throw new Error(`No runner for the backup type ${type}`)
-    }
-    Object.assign(baseSettings, job.settings[''])
-
-    this._baseSettings = baseSettings
-    this._settings = { ...baseSettings, ...job.settings[schedule.id] }
-
-    const { getRemoteTimeout } = this._settings
-    this._getAdapter = async function (remoteId) {
-      try {
-        const disposable = await pTimeout.call(getAdapter(remoteId), getRemoteTimeout, new RemoteTimeoutError(remoteId))
-
-        return new Disposable(() => disposable.dispose(), {
-          adapter: disposable.value,
-          remoteId,
-        })
-      } catch (error) {
-        // See https://github.com/vatesfr/xen-orchestra/commit/6aa6cfba8ec939c0288f0fa740f6dfad98c43cbb
-        runTask(
-          {
-            name: 'get remote adapter',
-            data: { type: 'remote', id: remoteId },
-          },
-          () => Promise.reject(error)
-        )
-      }
-    }
-  }
-
-  async _runMetadataBackup() {
-    const schedule = this._schedule
-    const job = this._job
-    const remoteIds = extractIdsFromSimplePattern(job.remotes)
-    if (remoteIds.length === 0) {
-      throw new Error('metadata backup job cannot run without remotes')
-    }
-
-    const config = this._config
-    const poolIds = extractIdsFromSimplePattern(job.pools)
-    const isEmptyPools = poolIds.length === 0
-    const isXoMetadata = job.xoMetadata !== undefined
-    if (!isXoMetadata && isEmptyPools) {
-      throw new Error('no metadata mode found')
-    }
-
-    const settings = this._settings
-
-    const { retentionPoolMetadata, retentionXoMetadata } = settings
-
-    if (
-      (retentionPoolMetadata === 0 && retentionXoMetadata === 0) ||
-      (!isXoMetadata && retentionPoolMetadata === 0) ||
-      (isEmptyPools && retentionXoMetadata === 0)
-    ) {
-      throw new Error('no retentions corresponding to the metadata modes found')
-    }
-
-    await Disposable.use(
-      Disposable.all(
-        poolIds.map(id =>
-          this._getRecord('pool', id).catch(error => {
-            // See https://github.com/vatesfr/xen-orchestra/commit/6aa6cfba8ec939c0288f0fa740f6dfad98c43cbb
-            runTask(
-              {
-                name: 'get pool record',
-                data: { type: 'pool', id },
-              },
-              () => Promise.reject(error)
-            )
-          })
-        )
-      ),
-      Disposable.all(remoteIds.map(id => this._getAdapter(id))),
-      async (pools, remoteAdapters) => {
-        // remove adapters that failed (already handled)
-        remoteAdapters = remoteAdapters.filter(_ => _ !== undefined)
-        if (remoteAdapters.length === 0) {
-          return
-        }
-        remoteAdapters = getAdaptersByRemote(remoteAdapters)
-
-        // remove pools that failed (already handled)
-        pools = pools.filter(_ => _ !== undefined)
-
-        const promises = []
-        if (pools.length !== 0 && settings.retentionPoolMetadata !== 0) {
-          promises.push(
-            asyncMap(pools, async pool =>
-              runTask(
-                {
-                  name: `Starting metadata backup for the pool (${pool.$id}). (${job.id})`,
-                  data: {
-                    id: pool.$id,
-                    pool,
-                    poolMaster: await ignoreErrors.call(pool.$xapi.getRecord('host', pool.master)),
-                    type: 'pool',
-                  },
-                },
-                () =>
-                  new PoolMetadataBackup({
-                    config,
-                    job,
-                    pool,
-                    remoteAdapters,
-                    schedule,
-                    settings,
-                  }).run()
-              )
-            )
-          )
-        }
-
-        if (job.xoMetadata !== undefined && settings.retentionXoMetadata !== 0) {
-          promises.push(
-            runTask(
-              {
-                name: `Starting XO metadata backup. (${job.id})`,
-                data: {
-                  type: 'xo',
-                },
-              },
-              () =>
-                new XoMetadataBackup({
-                  config,
-                  job,
-                  remoteAdapters,
-                  schedule,
-                  settings,
-                }).run()
-            )
-          )
-        }
-        await Promise.all(promises)
-      }
-    )
-  }
-
-  async _runVmBackup() {
-    const job = this._job
-
-    // FIXME: proper SimpleIdPattern handling
-    const getSnapshotNameLabel = this._getSnapshotNameLabel
-    const schedule = this._schedule
-    const settings = this._settings
-
-    const throttleStream = createStreamThrottle(settings.maxExportRate)
-
-    const config = this._config
-    await Disposable.use(
-      Disposable.all(
-        extractIdsFromSimplePattern(job.srs).map(id =>
-          this._getRecord('SR', id).catch(error => {
-            runTask(
-              {
-                name: 'get SR record',
-                data: { type: 'SR', id },
-              },
-              () => Promise.reject(error)
-            )
-          })
-        )
-      ),
-      Disposable.all(extractIdsFromSimplePattern(job.remotes).map(id => this._getAdapter(id))),
-      () => (settings.healthCheckSr !== undefined ? this._getRecord('SR', settings.healthCheckSr) : undefined),
-      async (srs, remoteAdapters, healthCheckSr) => {
-        // remove adapters that failed (already handled)
-        remoteAdapters = remoteAdapters.filter(_ => _ !== undefined)
-
-        // remove srs that failed (already handled)
-        srs = srs.filter(_ => _ !== undefined)
-
-        if (remoteAdapters.length === 0 && srs.length === 0 && settings.snapshotRetention === 0) {
-          return
-        }
-
-        const vmIds = extractIdsFromSimplePattern(job.vms)
-
-        Task.info('vms', { vms: vmIds })
-
-        remoteAdapters = getAdaptersByRemote(remoteAdapters)
-
-        const allSettings = this._job.settings
-        const baseSettings = this._baseSettings
-
-        const handleVm = vmUuid => {
-          const taskStart = { name: 'backup VM', data: { type: 'VM', id: vmUuid } }
-
-          return this._getRecord('VM', vmUuid).then(
-            disposableVm =>
-              Disposable.use(disposableVm, vm => {
-                taskStart.data.name_label = vm.name_label
-                return runTask(taskStart, () =>
-                  new VmBackup({
-                    baseSettings,
-                    config,
-                    getSnapshotNameLabel,
-                    healthCheckSr,
-                    job,
-                    remoteAdapters,
-                    schedule,
-                    settings: { ...settings, ...allSettings[vm.uuid] },
-                    srs,
-                    throttleStream,
-                    vm,
-                  }).run()
-                )
-              }),
-            error =>
-              runTask(taskStart, () => {
-                throw error
-              })
-          )
-        }
-        const { concurrency } = settings
-        await asyncMapSettled(vmIds, concurrency === 0 ? handleVm : limitConcurrency(concurrency)(handleVm))
-      }
-    )
-  }
-}

@xen-orchestra/backups/ImportVmBackup.js

@@ -3,14 +3,14 @@
 const assert = require('assert')
 
 const { formatFilenameDate } = require('./_filenameDate.js')
-const { importDeltaVm } = require('./_deltaVm.js')
+const { importIncrementalVm } = require('./_incrementalVm.js')
 const { Task } = require('./Task.js')
 const { watchStreamSize } = require('./_watchStreamSize.js')
 
 exports.ImportVmBackup = class ImportVmBackup {
   constructor({ adapter, metadata, srUuid, xapi, settings: { newMacAddresses, mapVdisSrs = {} } = {} }) {
     this._adapter = adapter
-    this._importDeltaVmSettings = { newMacAddresses, mapVdisSrs }
+    this._importIncrementalVmSettings = { newMacAddresses, mapVdisSrs }
     this._metadata = metadata
     this._srUuid = srUuid
     this._xapi = xapi
@@ -31,11 +31,11 @@ exports.ImportVmBackup = class ImportVmBackup {
       assert.strictEqual(metadata.mode, 'delta')
 
       const ignoredVdis = new Set(
-        Object.entries(this._importDeltaVmSettings.mapVdisSrs)
+        Object.entries(this._importIncrementalVmSettings.mapVdisSrs)
           .filter(([_, srUuid]) => srUuid === null)
           .map(([vdiUuid]) => vdiUuid)
       )
-      backup = await adapter.readDeltaVmBackup(metadata, ignoredVdis)
+      backup = await adapter.readIncrementalVmBackup(metadata, ignoredVdis)
       Object.values(backup.streams).forEach(stream => watchStreamSize(stream, sizeContainer))
     }
 
@@ -49,8 +49,8 @@ exports.ImportVmBackup = class ImportVmBackup {
 
         const vmRef = isFull
           ? await xapi.VM_import(backup, srRef)
-          : await importDeltaVm(backup, await xapi.getRecord('SR', srRef), {
+          : await importIncrementalVm(backup, await xapi.getRecord('SR', srRef), {
-              ...this._importDeltaVmSettings,
+              ...this._importIncrementalVmSettings,
               detectBase: false,
             })
 

@xen-orchestra/backups/PoolMetadataBackup.js

@@ -3,9 +3,9 @@
 const { asyncMap } = require('@xen-orchestra/async-map')
 
 const { DIR_XO_POOL_METADATA_BACKUPS } = require('./RemoteAdapter.js')
-const { forkStreamUnpipe } = require('./_forkStreamUnpipe.js')
 const { formatFilenameDate } = require('./_filenameDate.js')
 const { Task } = require('./Task.js')
+const { forkStreamUnpipe } = require('./_backupJob/forkStreamUnpipe.js')
 
 const PATH_DB_DUMP = '/pool/xmldbdump'
 exports.PATH_DB_DUMP = PATH_DB_DUMP

@xen-orchestra/backups/RemoteAdapter.js

@@ -252,7 +252,7 @@ class RemoteAdapter {
     )
   }
 
-  async deleteDeltaVmBackups(backups) {
+  async deleteIncrementalVmBackups(backups) {
     const handler = this._handler
 
     // this will delete the json, unused VHDs will be detected by `cleanVm`
@@ -304,7 +304,7 @@ class RemoteAdapter {
     }
 
     await Promise.all([
-      delta !== undefined && this.deleteDeltaVmBackups(delta),
+      delta !== undefined && this.deleteIncrementalVmBackups(delta),
       full !== undefined && this.deleteFullVmBackups(full),
     ])
 
@@ -717,7 +717,7 @@ class RemoteAdapter {
     return stream
   }
 
-  async readDeltaVmBackup(metadata, ignoredVdis) {
+  async readIncrementalVmBackup(metadata, ignoredVdis, { useSynthetic = true } = {}) {
     const handler = this._handler
     const { vbds, vhds, vifs, vm, vmSnapshot } = metadata
     const dir = dirname(metadata._filename)
@@ -725,7 +725,9 @@ class RemoteAdapter {
 
     const streams = {}
     await asyncMapSettled(Object.keys(vdis), async ref => {
-      streams[`${ref}.vhd`] = await this._createSyntheticStream(handler, join(dir, vhds[ref]))
+      streams[`${ref}.vhd`] = useSynthetic
+        ? await this._createSyntheticStream(handler, join(dir, vhds[ref]))
+        : await this._handler.createReadStream(join(dir, vhds[ref]))
     })
 
     return {

@xen-orchestra/backups/RestoreMetadataBackup.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const { DIR_XO_POOL_METADATA_BACKUPS } = require('./RemoteAdapter.js')
-const { PATH_DB_DUMP } = require('./_PoolMetadataBackup.js')
+const { PATH_DB_DUMP } = require('./PoolMetadataBackup.js')
 
 exports.RestoreMetadataBackup = class RestoreMetadataBackup {
   constructor({ backupId, handler, xapi }) {

@xen-orchestra/backups/_VmBackup.js

@@ -1,515 +0,0 @@
-'use strict'
-
-const assert = require('assert')
-const findLast = require('lodash/findLast.js')
-const groupBy = require('lodash/groupBy.js')
-const ignoreErrors = require('promise-toolbox/ignoreErrors')
-const keyBy = require('lodash/keyBy.js')
-const mapValues = require('lodash/mapValues.js')
-const vhdStreamValidator = require('vhd-lib/vhdStreamValidator.js')
-const { asyncMap } = require('@xen-orchestra/async-map')
-const { createLogger } = require('@xen-orchestra/log')
-const { decorateMethodsWith } = require('@vates/decorate-with')
-const { defer } = require('golike-defer')
-const { formatDateTime } = require('@xen-orchestra/xapi')
-const { pipeline } = require('node:stream')
-
-const { DeltaBackupWriter } = require('./writers/DeltaBackupWriter.js')
-const { DeltaReplicationWriter } = require('./writers/DeltaReplicationWriter.js')
-const { exportDeltaVm } = require('./_deltaVm.js')
-const { forkStreamUnpipe } = require('./_forkStreamUnpipe.js')
-const { FullBackupWriter } = require('./writers/FullBackupWriter.js')
-const { FullReplicationWriter } = require('./writers/FullReplicationWriter.js')
-const { getOldEntries } = require('./_getOldEntries.js')
-const { Task } = require('./Task.js')
-const { watchStreamSize } = require('./_watchStreamSize.js')
-
-const { debug, warn } = createLogger('xo:backups:VmBackup')
-
-class AggregateError extends Error {
-  constructor(errors, message) {
-    super(message)
-    this.errors = errors
-  }
-}
-
-const asyncEach = async (iterable, fn, thisArg = iterable) => {
-  for (const item of iterable) {
-    await fn.call(thisArg, item)
-  }
-}
-
-const forkDeltaExport = deltaExport =>
-  Object.create(deltaExport, {
-    streams: {
-      value: mapValues(deltaExport.streams, forkStreamUnpipe),
-    },
-  })
-
-const noop = Function.prototype
-
-class VmBackup {
-  constructor({
-    config,
-    getSnapshotNameLabel,
-    healthCheckSr,
-    job,
-    remoteAdapters,
-    remotes,
-    schedule,
-    settings,
-    srs,
-    throttleStream,
-    vm,
-  }) {
-    if (vm.other_config['xo:backup:job'] === job.id && 'start' in vm.blocked_operations) {
-      // don't match replicated VMs created by this very job otherwise they
-      // will be replicated again and again
-      throw new Error('cannot backup a VM created by this very job')
-    }
-
-    this.config = config
-    this.job = job
-    this.remoteAdapters = remoteAdapters
-    this.scheduleId = schedule.id
-    this.timestamp = undefined
-
-    // VM currently backed up
-    this.vm = vm
-    const { tags } = this.vm
-
-    // VM (snapshot) that is really exported
-    this.exportedVm = undefined
-
-    this._fullVdisRequired = undefined
-    this._getSnapshotNameLabel = getSnapshotNameLabel
-    this._isDelta = job.mode === 'delta'
-    this._healthCheckSr = healthCheckSr
-    this._jobId = job.id
-    this._jobSnapshots = undefined
-    this._throttleStream = throttleStream
-    this._xapi = vm.$xapi
-
-    // Base VM for the export
-    this._baseVm = undefined
-
-    // Settings for this specific run (job, schedule, VM)
-    if (tags.includes('xo-memory-backup')) {
-      settings.checkpointSnapshot = true
-    }
-    if (tags.includes('xo-offline-backup')) {
-      settings.offlineSnapshot = true
-    }
-    this._settings = settings
-
-    // Create writers
-    {
-      const writers = new Set()
-      this._writers = writers
-
-      const [BackupWriter, ReplicationWriter] = this._isDelta
-        ? [DeltaBackupWriter, DeltaReplicationWriter]
-        : [FullBackupWriter, FullReplicationWriter]
-
-      const allSettings = job.settings
-      Object.keys(remoteAdapters).forEach(remoteId => {
-        const targetSettings = {
-          ...settings,
-          ...allSettings[remoteId],
-        }
-        if (targetSettings.exportRetention !== 0) {
-          writers.add(new BackupWriter({ backup: this, remoteId, settings: targetSettings }))
-        }
-      })
-      srs.forEach(sr => {
-        const targetSettings = {
-          ...settings,
-          ...allSettings[sr.uuid],
-        }
-        if (targetSettings.copyRetention !== 0) {
-          writers.add(new ReplicationWriter({ backup: this, sr, settings: targetSettings }))
-        }
-      })
-    }
-  }
-
-  // calls fn for each function, warns of any errors, and throws only if there are no writers left
-  async _callWriters(fn, step, parallel = true) {
-    const writers = this._writers
-    const n = writers.size
-    if (n === 0) {
-      return
-    }
-
-    async function callWriter(writer) {
-      const { name } = writer.constructor
-      try {
-        debug('writer step starting', { step, writer: name })
-        await fn(writer)
-        debug('writer step succeeded', { duration: step, writer: name })
-      } catch (error) {
-        writers.delete(writer)
-
-        warn('writer step failed', { error, step, writer: name })
-
-        // these two steps are the only one that are not already in their own sub tasks
-        if (step === 'writer.checkBaseVdis()' || step === 'writer.beforeBackup()') {
-          Task.warning(
-            `the writer ${name} has failed the step ${step} with error ${error.message}. It won't be used anymore in this job execution.`
-          )
-        }
-
-        throw error
-      }
-    }
-    if (n === 1) {
-      const [writer] = writers
-      return callWriter(writer)
-    }
-
-    const errors = []
-    await (parallel ? asyncMap : asyncEach)(writers, async function (writer) {
-      try {
-        await callWriter(writer)
-      } catch (error) {
-        errors.push(error)
-      }
-    })
-    if (writers.size === 0) {
-      throw new AggregateError(errors, 'all targets have failed, step: ' + step)
-    }
-  }
-
-  // ensure the VM itself does not have any backup metadata which would be
-  // copied on manual snapshots and interfere with the backup jobs
-  async _cleanMetadata() {
-    const { vm } = this
-    if ('xo:backup:job' in vm.other_config) {
-      await vm.update_other_config({
-        'xo:backup:datetime': null,
-        'xo:backup:deltaChainLength': null,
-        'xo:backup:exported': null,
-        'xo:backup:job': null,
-        'xo:backup:schedule': null,
-        'xo:backup:vm': null,
-      })
-    }
-  }
-
-  async _snapshot() {
-    const { vm } = this
-    const xapi = this._xapi
-
-    const settings = this._settings
-
-    const doSnapshot =
-      settings.unconditionalSnapshot ||
-      this._isDelta ||
-      (!settings.offlineBackup && vm.power_state === 'Running') ||
-      settings.snapshotRetention !== 0
-    if (doSnapshot) {
-      await Task.run({ name: 'snapshot' }, async () => {
-        if (!settings.bypassVdiChainsCheck) {
-          await vm.$assertHealthyVdiChains()
-        }
-
-        const snapshotRef = await vm[settings.checkpointSnapshot ? '$checkpoint' : '$snapshot']({
-          ignoreNobakVdis: true,
-          name_label: this._getSnapshotNameLabel(vm),
-          unplugVusbs: true,
-        })
-        this.timestamp = Date.now()
-
-        await xapi.setFieldEntries('VM', snapshotRef, 'other_config', {
-          'xo:backup:datetime': formatDateTime(this.timestamp),
-          'xo:backup:job': this._jobId,
-          'xo:backup:schedule': this.scheduleId,
-          'xo:backup:vm': vm.uuid,
-        })
-
-        this.exportedVm = await xapi.getRecord('VM', snapshotRef)
-
-        return this.exportedVm.uuid
-      })
-    } else {
-      this.exportedVm = vm
-      this.timestamp = Date.now()
-    }
-  }
-
-  async _copyDelta() {
-    const { exportedVm } = this
-    const baseVm = this._baseVm
-    const fullVdisRequired = this._fullVdisRequired
-
-    const isFull = fullVdisRequired === undefined || fullVdisRequired.size !== 0
-
-    await this._callWriters(writer => writer.prepare({ isFull }), 'writer.prepare()')
-
-    const deltaExport = await exportDeltaVm(exportedVm, baseVm, {
-      fullVdisRequired,
-    })
-    // since NBD is network based, if one disk use nbd , all the disk use them
-    // except the suspended VDI
-    if (Object.values(deltaExport.streams).some(({ _nbd }) => _nbd)) {
-      Task.info('Transfer data using NBD')
-    }
-    const sizeContainers = mapValues(deltaExport.streams, stream => watchStreamSize(stream))
-
-    if (this._settings.validateVhdStreams) {
-      deltaExport.streams = mapValues(deltaExport.streams, stream => pipeline(stream, vhdStreamValidator, noop))
-    }
-
-    deltaExport.streams = mapValues(deltaExport.streams, this._throttleStream)
-
-    const timestamp = Date.now()
-
-    await this._callWriters(
-      writer =>
-        writer.transfer({
-          deltaExport: forkDeltaExport(deltaExport),
-          sizeContainers,
-          timestamp,
-        }),
-      'writer.transfer()'
-    )
-
-    this._baseVm = exportedVm
-
-    if (baseVm !== undefined) {
-      await exportedVm.update_other_config(
-        'xo:backup:deltaChainLength',
-        String(+(baseVm.other_config['xo:backup:deltaChainLength'] ?? 0) + 1)
-      )
-    }
-
-    // not the case if offlineBackup
-    if (exportedVm.is_a_snapshot) {
-      await exportedVm.update_other_config('xo:backup:exported', 'true')
-    }
-
-    const size = Object.values(sizeContainers).reduce((sum, { size }) => sum + size, 0)
-    const end = Date.now()
-    const duration = end - timestamp
-    debug('transfer complete', {
-      duration,
-      speed: duration !== 0 ? (size * 1e3) / 1024 / 1024 / duration : 0,
-      size,
-    })
-
-    await this._callWriters(writer => writer.cleanup(), 'writer.cleanup()')
-  }
-
-  async _copyFull() {
-    const { compression } = this.job
-    const stream = this._throttleStream(
-      await this._xapi.VM_export(this.exportedVm.$ref, {
-        compress: Boolean(compression) && (compression === 'native' ? 'gzip' : 'zstd'),
-        useSnapshot: false,
-      })
-    )
-    const sizeContainer = watchStreamSize(stream)
-
-    const timestamp = Date.now()
-
-    await this._callWriters(
-      writer =>
-        writer.run({
-          sizeContainer,
-          stream: forkStreamUnpipe(stream),
-          timestamp,
-        }),
-      'writer.run()'
-    )
-
-    const { size } = sizeContainer
-    const end = Date.now()
-    const duration = end - timestamp
-    debug('transfer complete', {
-      duration,
-      speed: duration !== 0 ? (size * 1e3) / 1024 / 1024 / duration : 0,
-      size,
-    })
-  }
-
-  async _fetchJobSnapshots() {
-    const jobId = this._jobId
-    const vmRef = this.vm.$ref
-    const xapi = this._xapi
-
-    const snapshotsRef = await xapi.getField('VM', vmRef, 'snapshots')
-    const snapshotsOtherConfig = await asyncMap(snapshotsRef, ref => xapi.getField('VM', ref, 'other_config'))
-
-    const snapshots = []
-    snapshotsOtherConfig.forEach((other_config, i) => {
-      if (other_config['xo:backup:job'] === jobId) {
-        snapshots.push({ other_config, $ref: snapshotsRef[i] })
-      }
-    })
-    snapshots.sort((a, b) => (a.other_config['xo:backup:datetime'] < b.other_config['xo:backup:datetime'] ? -1 : 1))
-    this._jobSnapshots = snapshots
-  }
-
-  async _removeUnusedSnapshots() {
-    const allSettings = this.job.settings
-    const baseSettings = this._baseSettings
-    const baseVmRef = this._baseVm?.$ref
-
-    const snapshotsPerSchedule = groupBy(this._jobSnapshots, _ => _.other_config['xo:backup:schedule'])
-    const xapi = this._xapi
-    await asyncMap(Object.entries(snapshotsPerSchedule), ([scheduleId, snapshots]) => {
-      const settings = {
-        ...baseSettings,
-        ...allSettings[scheduleId],
-        ...allSettings[this.vm.uuid],
-      }
-      return asyncMap(getOldEntries(settings.snapshotRetention, snapshots), ({ $ref }) => {
-        if ($ref !== baseVmRef) {
-          return xapi.VM_destroy($ref)
-        }
-      })
-    })
-  }
-
-  async _selectBaseVm() {
-    const xapi = this._xapi
-
-    let baseVm = findLast(this._jobSnapshots, _ => 'xo:backup:exported' in _.other_config)
-    if (baseVm === undefined) {
-      debug('no base VM found')
-      return
-    }
-
-    const fullInterval = this._settings.fullInterval
-    const deltaChainLength = +(baseVm.other_config['xo:backup:deltaChainLength'] ?? 0) + 1
-    if (!(fullInterval === 0 || fullInterval > deltaChainLength)) {
-      debug('not using base VM becaust fullInterval reached')
-      return
-    }
-
-    const srcVdis = keyBy(await xapi.getRecords('VDI', await this.vm.$getDisks()), '$ref')
-
-    // resolve full record
-    baseVm = await xapi.getRecord('VM', baseVm.$ref)
-
-    const baseUuidToSrcVdi = new Map()
-    await asyncMap(await baseVm.$getDisks(), async baseRef => {
-      const [baseUuid, snapshotOf] = await Promise.all([
-        xapi.getField('VDI', baseRef, 'uuid'),
-        xapi.getField('VDI', baseRef, 'snapshot_of'),
-      ])
-      const srcVdi = srcVdis[snapshotOf]
-      if (srcVdi !== undefined) {
-        baseUuidToSrcVdi.set(baseUuid, srcVdi)
-      } else {
-        debug('ignore snapshot VDI because no longer present on VM', {
-          vdi: baseUuid,
-        })
-      }
-    })
-
-    const presentBaseVdis = new Map(baseUuidToSrcVdi)
-    await this._callWriters(
-      writer => presentBaseVdis.size !== 0 && writer.checkBaseVdis(presentBaseVdis, baseVm),
-      'writer.checkBaseVdis()',
-      false
-    )
-
-    if (presentBaseVdis.size === 0) {
-      debug('no base VM found')
-      return
-    }
-
-    const fullVdisRequired = new Set()
-    baseUuidToSrcVdi.forEach((srcVdi, baseUuid) => {
-      if (presentBaseVdis.has(baseUuid)) {
-        debug('found base VDI', {
-          base: baseUuid,
-          vdi: srcVdi.uuid,
-        })
-      } else {
-        debug('missing base VDI', {
-          base: baseUuid,
-          vdi: srcVdi.uuid,
-        })
-        fullVdisRequired.add(srcVdi.uuid)
-      }
-    })
-
-    this._baseVm = baseVm
-    this._fullVdisRequired = fullVdisRequired
-  }
-
-  async _healthCheck() {
-    const settings = this._settings
-
-    if (this._healthCheckSr === undefined) {
-      return
-    }
-
-    // check if current VM has tags
-    const { tags } = this.vm
-    const intersect = settings.healthCheckVmsWithTags.some(t => tags.includes(t))
-
-    if (settings.healthCheckVmsWithTags.length !== 0 && !intersect) {
-      return
-    }
-
-    await this._callWriters(writer => writer.healthCheck(this._healthCheckSr), 'writer.healthCheck()')
-  }
-
-  async run($defer) {
-    const settings = this._settings
-    assert(
-      !settings.offlineBackup || settings.snapshotRetention === 0,
-      'offlineBackup is not compatible with snapshotRetention'
-    )
-
-    await this._callWriters(async writer => {
-      await writer.beforeBackup()
-      $defer(async () => {
-        await writer.afterBackup()
-      })
-    }, 'writer.beforeBackup()')
-
-    await this._fetchJobSnapshots()
-
-    if (this._isDelta) {
-      await this._selectBaseVm()
-    }
-
-    await this._cleanMetadata()
-    await this._removeUnusedSnapshots()
-
-    const { vm } = this
-    const isRunning = vm.power_state === 'Running'
-    const startAfter = isRunning && (settings.offlineBackup ? 'backup' : settings.offlineSnapshot && 'snapshot')
-    if (startAfter) {
-      await vm.$callAsync('clean_shutdown')
-    }
-
-    try {
-      await this._snapshot()
-      if (startAfter === 'snapshot') {
-        ignoreErrors.call(vm.$callAsync('start', false, false))
-      }
-
-      if (this._writers.size !== 0) {
-        await (this._isDelta ? this._copyDelta() : this._copyFull())
-      }
-    } finally {
-      if (startAfter) {
-        ignoreErrors.call(vm.$callAsync('start', false, false))
-      }
-
-      await this._fetchJobSnapshots()
-      await this._removeUnusedSnapshots()
-    }
-    await this._healthCheck()
-  }
-}
-exports.VmBackup = VmBackup
-
-decorateMethodsWith(VmBackup, {
-  run: defer,
-})

@xen-orchestra/backups/_backupJob/AbstractBackupJob.js

@@ -0,0 +1,51 @@
+'use strict'
+
+const Disposable = require('promise-toolbox/Disposable')
+const pTimeout = require('promise-toolbox/timeout')
+const { compileTemplate } = require('@xen-orchestra/template')
+const { RemoteTimeoutError } = require('./RemoteTimeoutError.js')
+const { runTask } = require('./runTask.js')
+
+exports.DEFAULT_SETTINGS = {
+  getRemoteTimeout: 300e3,
+  reportWhen: 'failure',
+}
+
+exports.AbstractBackupJob = class AbstractBackupJob {
+  constructor({ config, getAdapter, getConnectedRecord, job, schedule }) {
+    this._config = config
+    this._getRecord = getConnectedRecord
+    this._job = job
+    this._schedule = schedule
+
+    this._getSnapshotNameLabel = compileTemplate(config.snapshotNameLabelTpl, {
+      '{job.name}': job.name,
+      '{vm.name_label}': vm => vm.name_label,
+    })
+
+    const baseSettings = this._computeBaseSettings(config, job)
+    this._baseSettings = baseSettings
+    this._settings = { ...baseSettings, ...job.settings[schedule.id] }
+
+    const { getRemoteTimeout } = this._settings
+    this._getAdapter = async function (remoteId) {
+      try {
+        const disposable = await pTimeout.call(getAdapter(remoteId), getRemoteTimeout, new RemoteTimeoutError(remoteId))
+
+        return new Disposable(() => disposable.dispose(), {
+          adapter: disposable.value,
+          remoteId,
+        })
+      } catch (error) {
+        // See https://github.com/vatesfr/xen-orchestra/commit/6aa6cfba8ec939c0288f0fa740f6dfad98c43cbb
+        runTask(
+          {
+            name: 'get remote adapter',
+            data: { type: 'remote', id: remoteId },
+          },
+          () => Promise.reject(error)
+        )
+      }
+    }
+  }
+}

@xen-orchestra/backups/_backupJob/MetadatasBackupJob.js

@@ -0,0 +1,134 @@
+'use strict'
+
+const { asyncMap } = require('@xen-orchestra/async-map')
+const Disposable = require('promise-toolbox/Disposable')
+const ignoreErrors = require('promise-toolbox/ignoreErrors')
+
+const { extractIdsFromSimplePattern } = require('../extractIdsFromSimplePattern.js')
+const { PoolMetadataBackup } = require('../PoolMetadataBackup.js')
+const { XoMetadataBackup } = require('./XoMetadataBackup.js')
+const { DEFAULT_SETTINGS, AbstractBackupJob } = require('./AbstractBackupJob.js')
+const { runTask } = require('./runTask.js')
+const { getAdaptersByRemote } = require('./getAdapterByRemote.js')
+
+const DEFAULT_METADATA_SETTINGS = {
+  retentionPoolMetadata: 0,
+  retentionXoMetadata: 0,
+}
+
+exports.MetadatasBackupJob = class MetadatasBackupJob extends AbstractBackupJob {
+  _computeBaseSettings(config, job) {
+    const baseSettings = { ...DEFAULT_SETTINGS }
+    Object.assign(baseSettings, DEFAULT_METADATA_SETTINGS, config.defaultSettings, config.metadata?.defaultSettings)
+    Object.assign(baseSettings, job.settings[''])
+    return baseSettings
+  }
+
+  async run() {
+    const schedule = this._schedule
+    const job = this._job
+    const remoteIds = extractIdsFromSimplePattern(job.remotes)
+    if (remoteIds.length === 0) {
+      throw new Error('metadata backup job cannot run without remotes')
+    }
+
+    const config = this._config
+    const poolIds = extractIdsFromSimplePattern(job.pools)
+    const isEmptyPools = poolIds.length === 0
+    const isXoMetadata = job.xoMetadata !== undefined
+    if (!isXoMetadata && isEmptyPools) {
+      throw new Error('no metadata mode found')
+    }
+
+    const settings = this._settings
+
+    const { retentionPoolMetadata, retentionXoMetadata } = settings
+
+    if (
+      (retentionPoolMetadata === 0 && retentionXoMetadata === 0) ||
+      (!isXoMetadata && retentionPoolMetadata === 0) ||
+      (isEmptyPools && retentionXoMetadata === 0)
+    ) {
+      throw new Error('no retentions corresponding to the metadata modes found')
+    }
+
+    await Disposable.use(
+      Disposable.all(
+        poolIds.map(id =>
+          this._getRecord('pool', id).catch(error => {
+            // See https://github.com/vatesfr/xen-orchestra/commit/6aa6cfba8ec939c0288f0fa740f6dfad98c43cbb
+            runTask(
+              {
+                name: 'get pool record',
+                data: { type: 'pool', id },
+              },
+              () => Promise.reject(error)
+            )
+          })
+        )
+      ),
+      Disposable.all(remoteIds.map(id => this._getAdapter(id))),
+      async (pools, remoteAdapters) => {
+        // remove adapters that failed (already handled)
+        remoteAdapters = remoteAdapters.filter(_ => _ !== undefined)
+        if (remoteAdapters.length === 0) {
+          return
+        }
+        remoteAdapters = getAdaptersByRemote(remoteAdapters)
+
+        // remove pools that failed (already handled)
+        pools = pools.filter(_ => _ !== undefined)
+
+        const promises = []
+        if (pools.length !== 0 && settings.retentionPoolMetadata !== 0) {
+          promises.push(
+            asyncMap(pools, async pool =>
+              runTask(
+                {
+                  name: `Starting metadata backup for the pool (${pool.$id}). (${job.id})`,
+                  data: {
+                    id: pool.$id,
+                    pool,
+                    poolMaster: await ignoreErrors.call(pool.$xapi.getRecord('host', pool.master)),
+                    type: 'pool',
+                  },
+                },
+                () =>
+                  new PoolMetadataBackup({
+                    config,
+                    job,
+                    pool,
+                    remoteAdapters,
+                    schedule,
+                    settings,
+                  }).run()
+              )
+            )
+          )
+        }
+
+        if (job.xoMetadata !== undefined && settings.retentionXoMetadata !== 0) {
+          promises.push(
+            runTask(
+              {
+                name: `Starting XO metadata backup. (${job.id})`,
+                data: {
+                  type: 'xo',
+                },
+              },
+              () =>
+                new XoMetadataBackup({
+                  config,
+                  job,
+                  remoteAdapters,
+                  schedule,
+                  settings,
+                }).run()
+            )
+          )
+        }
+        await Promise.all(promises)
+      }
+    )
+  }
+}

@xen-orchestra/backups/_backupJob/RemoteTimeoutError.js

@@ -0,0 +1,7 @@
+'use strict'
+exports.RemoteTimeoutError = class RemoteTimeoutError extends Error {
+  constructor(remoteId) {
+    super('timeout while getting the remote ' + remoteId)
+    this.remoteId = remoteId
+  }
+}

@xen-orchestra/backups/_backupJob/RemoteVmBackupJob.js

@@ -0,0 +1,107 @@
+'use strict'
+
+const { asyncMapSettled, asyncMap } = require('@xen-orchestra/async-map')
+const Disposable = require('promise-toolbox/Disposable')
+const { limitConcurrency } = require('limit-concurrency-decorator')
+
+const { extractIdsFromSimplePattern } = require('../extractIdsFromSimplePattern.js')
+const { Task } = require('../Task.js')
+const createStreamThrottle = require('./createStreamThrottle.js')
+const { DEFAULT_SETTINGS, AbstractBackupJob } = require('./AbstractBackupJob.js')
+const { runTask } = require('./runTask.js')
+const { getAdaptersByRemote } = require('./getAdapterByRemote.js')
+const { IncrementalRemoteVmBackup } = require('./VmBackup/IncrementalRemoteVmBackup.js')
+const { FullRemoteVmBackup } = require('./VmBackup/FullRemoteVmBackup.js')
+
+const DEFAULT_REMOTE_VM_SETTINGS = {
+  concurrency: 2,
+  copyRetention: 0,
+  deleteFirst: false,
+  exportRetention: 0,
+  fullInterval: 0,
+  healthCheckSr: undefined,
+  healthCheckVmsWithTags: [],
+  maxExportRate: 0,
+  maxMergedDeltasPerRun: Infinity,
+  timeout: 0,
+  validateVhdStreams: false,
+  vmTimeout: 0,
+}
+
+exports.RemoteVmBackupJob = class RemoteVmBackupJob extends AbstractBackupJob {
+  _computeBaseSettings(config, job) {
+    const baseSettings = { ...DEFAULT_SETTINGS }
+    Object.assign(baseSettings, DEFAULT_REMOTE_VM_SETTINGS, config.defaultSettings, config.vm?.defaultSettings)
+    Object.assign(baseSettings, job.settings[''])
+    return baseSettings
+  }
+
+  async run() {
+    const job = this._job
+    const schedule = this._schedule
+    const settings = this._settings
+
+    const throttleStream = createStreamThrottle(settings.maxExportRate)
+
+    const config = this._config
+    await Disposable.use(
+      () => this._getAdapter(job.sourceRemote),
+      () => (settings.healthCheckSr !== undefined ? this._getRecord('SR', settings.healthCheckSr) : undefined),
+      Disposable.all(
+        extractIdsFromSimplePattern(job.remotes).map(id => id !== job.sourceRemote && this._getAdapter(id))
+      ),
+      async ({ adapter: sourceRemoteAdapter }, healthCheckSr, remoteAdapters) => {
+        // remove adapters that failed (already handled)
+        remoteAdapters = remoteAdapters.filter(_ => !!_)
+        if (remoteAdapters.length === 0) {
+          return
+        }
+
+        const vmsUuids = []
+        await asyncMap(await sourceRemoteAdapter._handler.list('xo-vm-backups'), async entry => {
+          // ignore hidden and lock files
+          if (entry[0] !== '.' && !entry.endsWith('.lock')) {
+            vmsUuids.push(entry)
+          }
+        })
+
+        Task.info('vms', { vms: vmsUuids })
+
+        remoteAdapters = getAdaptersByRemote(remoteAdapters)
+        const allSettings = this._job.settings
+        const baseSettings = this._baseSettings
+
+        const handleVm = vmUuid => {
+          const taskStart = { name: 'backup VM', data: { type: 'VM', id: vmUuid } }
+
+          const opts = {
+            baseSettings,
+            config,
+            job,
+            healthCheckSr,
+            remoteAdapters,
+            schedule,
+            settings: { ...settings, ...allSettings[vmUuid] },
+            sourceRemoteAdapter,
+            throttleStream,
+            vmUuid,
+          }
+          let vmBackup
+          if (job.mode === 'delta') {
+            vmBackup = new IncrementalRemoteVmBackup(opts)
+          } else {
+            if (job.mode === 'full') {
+              vmBackup = new FullRemoteVmBackup(opts)
+            } else {
+              throw new Error(`Job mode ${job.mode} not implemented`)
+            }
+          }
+
+          return runTask(taskStart, () => vmBackup.run())
+        }
+        const { concurrency } = settings
+        await asyncMapSettled(vmsUuids, !concurrency ? handleVm : limitConcurrency(concurrency)(handleVm))
+      }
+    )
+  }
+}

@xen-orchestra/backups/_backupJob/VmBackup/AbstractRemoteVmBackup.js

@@ -0,0 +1,100 @@
+'use strict'
+const { AbstractVmBackup } = require('./AbstractVmBackup')
+const { getVmBackupDir } = require('../../_getVmBackupDir')
+
+const { decorateMethodsWith } = require('@vates/decorate-with')
+const { defer } = require('golike-defer')
+class AbstractRemoteVmBackup extends AbstractVmBackup {
+  constructor({
+    config,
+    job,
+    healthCheckSr,
+    remoteAdapters,
+    schedule,
+    settings,
+    sourceRemoteAdapter,
+    throttleStream,
+    vmUuid,
+  }) {
+    super()
+    this.config = config
+    this.job = job
+    this.remoteAdapters = remoteAdapters
+    this.scheduleId = schedule.id
+    this.timestamp = undefined
+
+    // the vm object is used in writers
+    // remoteWriter only need vm.uuid
+    // @todo : how to do better ?
+    // missing tags for healthcheck
+    this.vm = { uuid: vmUuid }
+
+    this._healthCheckSr = healthCheckSr
+    this._sourceRemoteAdapter = sourceRemoteAdapter
+    this._throttleStream = throttleStream
+
+    const allSettings = job.settings
+    const writers = new Set()
+    this._writers = writers
+
+    const RemoteWriter = this._getRemoteWriter()
+    Object.keys(remoteAdapters).forEach(remoteId => {
+      const targetSettings = {
+        ...settings,
+        ...allSettings[remoteId],
+      }
+      if (targetSettings.exportRetention !== 0) {
+        writers.add(new RemoteWriter({ backup: this, remoteId, settings: targetSettings }))
+      }
+    })
+  }
+
+  async _computeTransferList(predicate) {
+    const vmBackups = await this._sourceRemoteAdapter.listVmBackups(this.vm.uuid, predicate)
+
+    const localMetada = {}
+    Object.values(vmBackups).forEach(metadata => {
+      const timestamp = metadata.timestamp
+      localMetada[timestamp] = metadata
+    })
+    const nbRemotes = Object.keys(this.remoteAdapters).length
+    const remoteMetadatas = {}
+    await Promise.all(
+      Object.values(this.remoteAdapters).map(async remoteAdapter => {
+        const remoteMetadata = await remoteAdapter.listVmBackups(this.vm.uuid, predicate)
+        remoteMetadata.forEach(metadata => {
+          const timestamp = metadata.timestamp
+          remoteMetadatas[timestamp] = (remoteMetadatas[timestamp] ?? 0) + 1
+        })
+      })
+    )
+
+    let chain = []
+    for (const timestamp in localMetada) {
+      if (remoteMetadatas[timestamp] !== nbRemotes) {
+        // this backup is not present in all the remote
+        // should be retransfered if not found later
+        chain.push(localMetada[timestamp])
+      } else {
+        // backup is present in local and remote : the chain has already been transferred
+        chain = []
+      }
+    }
+
+    return chain
+  }
+
+  async run($defer) {
+    const handler = this._sourceRemoteAdapter._handler
+    const sourceLock = await handler.lock(getVmBackupDir(this.vm.uuid))
+    $defer(async () => {
+      sourceLock.dispose()
+    })
+    await this._run()
+  }
+}
+
+exports.AbstractRemoteVmBackup = AbstractRemoteVmBackup
+decorateMethodsWith(AbstractRemoteVmBackup, {
+  run: defer,
+})

@xen-orchestra/backups/_backupJob/VmBackup/AbstractVmBackup.js

@@ -0,0 +1,90 @@
+'use strict'
+
+const { createLogger } = require('@xen-orchestra/log')
+const { Task } = require('../../Task')
+const { asyncMap } = require('@xen-orchestra/async-map')
+const { debug, warn } = createLogger('xo:backups:AbstractVmBackup')
+
+class AggregateError extends Error {
+  constructor(errors, message) {
+    super(message)
+    this.errors = errors
+  }
+}
+
+const asyncEach = async (iterable, fn, thisArg = iterable) => {
+  for (const item of iterable) {
+    await fn.call(thisArg, item)
+  }
+}
+
+class AbstractVmBackup {
+  // calls fn for each function, warns of any errors, and throws only if there are no writers left
+  async _callWriters(fn, step, parallel = true) {
+    const writers = this._writers
+    const n = writers.size
+    if (n === 0) {
+      return
+    }
+
+    async function callWriter(writer) {
+      const { name } = writer.constructor
+      try {
+        debug('writer step starting', { step, writer: name })
+        await fn(writer)
+        debug('writer step succeeded', { duration: step, writer: name })
+      } catch (error) {
+        writers.delete(writer)
+
+        warn('writer step failed', { error, step, writer: name })
+
+        // these two steps are the only one that are not already in their own sub tasks
+        if (step === 'writer.checkBaseVdis()' || step === 'writer.beforeBackup()') {
+          Task.warning(
+            `the writer ${name} has failed the step ${step} with error ${error.message}. It won't be used anymore in this job execution.`
+          )
+        }
+
+        throw error
+      }
+    }
+    if (n === 1) {
+      const [writer] = writers
+      return callWriter(writer)
+    }
+
+    const errors = []
+    await (parallel ? asyncMap : asyncEach)(writers, async function (writer) {
+      try {
+        await callWriter(writer)
+      } catch (error) {
+        errors.push(error)
+      }
+    })
+    if (writers.size === 0) {
+      throw new AggregateError(errors, 'all targets have failed, step: ' + step)
+    }
+  }
+
+  async _healthCheck() {
+    const settings = this._settings
+
+    if (this._healthCheckSr === undefined) {
+      return
+    }
+
+    // check if current VM has tags
+    const { tags } = this.vm
+    const intersect = settings.healthCheckVmsWithTags.some(t => tags.includes(t))
+
+    if (settings.healthCheckVmsWithTags.length !== 0 && !intersect) {
+      return
+    }
+
+    await this._callWriters(writer => writer.healthCheck(this._healthCheckSr), 'writer.healthCheck()')
+  }
+  async run() {
+    throw new Error('not implemented')
+  }
+}
+exports.AbstractVmBackup = AbstractVmBackup

@xen-orchestra/backups/_backupJob/VmBackup/AbstractXapiVMBackup.js

@@ -0,0 +1,258 @@
+'use strict'
+
+const assert = require('assert')
+const ignoreErrors = require('promise-toolbox/ignoreErrors')
+const groupBy = require('lodash/groupBy.js')
+const { asyncMap } = require('@xen-orchestra/async-map')
+const { decorateMethodsWith } = require('@vates/decorate-with')
+const { defer } = require('golike-defer')
+const { formatDateTime } = require('@xen-orchestra/xapi')
+const { getOldEntries } = require('./writers/_getOldEntries.js')
+
+const { Task } = require('../../Task.js')
+const { AbstractVmBackup } = require('./AbstractVmBackup.js')
+
+class AbstractXapiVmBackup extends AbstractVmBackup {
+  constructor({
+    config,
+    getSnapshotNameLabel,
+    healthCheckSr,
+    job,
+    remoteAdapters,
+    schedule,
+    settings,
+    srs,
+    throttleStream,
+    vm,
+  }) {
+    super()
+    if (vm.other_config['xo:backup:job'] === job.id && 'start' in vm.blocked_operations) {
+      // don't match replicated VMs created by this very job otherwise they
+      // will be replicated again and again
+      throw new Error('cannot backup a VM created by this very job')
+    }
+
+    this.config = config
+    this.job = job
+    this.remoteAdapters = remoteAdapters
+    this.scheduleId = schedule.id
+    this.timestamp = undefined
+
+    // VM currently backed up
+    this.vm = vm
+    const { tags } = this.vm
+
+    // VM (snapshot) that is really exported
+    this.exportedVm = undefined
+
+    this._fullVdisRequired = undefined
+    this._getSnapshotNameLabel = getSnapshotNameLabel
+    this._healthCheckSr = healthCheckSr
+    this._jobId = job.id
+    this._jobSnapshots = undefined
+    this._throttleStream = throttleStream
+    this._xapi = vm.$xapi
+
+    // Reference VM for the incremental export
+    // if possible we willonly export the difference between thie vm and now
+    this._vmComparisonBasis = undefined
+
+    // Settings for this specific run (job, schedule, VM)
+    if (tags.includes('xo-memory-backup')) {
+      settings.checkpointSnapshot = true
+    }
+    if (tags.includes('xo-offline-backup')) {
+      settings.offlineSnapshot = true
+    }
+    this._settings = settings
+
+    // Create writers
+    {
+      const writers = new Set()
+      this._writers = writers
+
+      const [RemoteWriter, XapiWriter] = this._getWriters()
+
+      const allSettings = job.settings
+      Object.keys(remoteAdapters).forEach(remoteId => {
+        const targetSettings = {
+          ...settings,
+          ...allSettings[remoteId],
+        }
+        if (targetSettings.exportRetention !== 0) {
+          writers.add(new RemoteWriter({ backup: this, remoteId, settings: targetSettings }))
+        }
+      })
+      srs.forEach(sr => {
+        const targetSettings = {
+          ...settings,
+          ...allSettings[sr.uuid],
+        }
+        if (targetSettings.copyRetention !== 0) {
+          writers.add(new XapiWriter({ backup: this, sr, settings: targetSettings }))
+        }
+      })
+    }
+  }
+
+  // ensure the VM itself does not have any backup metadata which would be
+  // copied on manual snapshots and interfere with the backup jobs
+  async _cleanMetadata() {
+    const { vm } = this
+    if ('xo:backup:job' in vm.other_config) {
+      await vm.update_other_config({
+        'xo:backup:datetime': null,
+        'xo:backup:deltaChainLength': null,
+        'xo:backup:exported': null,
+        'xo:backup:job': null,
+        'xo:backup:schedule': null,
+        'xo:backup:vm': null,
+      })
+    }
+  }
+
+  async _snapshot() {
+    const { vm } = this
+    const xapi = this._xapi
+
+    const settings = this._settings
+
+    if (this._mustDoSnapshot()) {
+      await Task.run({ name: 'snapshot' }, async () => {
+        if (!settings.bypassVdiChainsCheck) {
+          await vm.$assertHealthyVdiChains()
+        }
+
+        const snapshotRef = await vm[settings.checkpointSnapshot ? '$checkpoint' : '$snapshot']({
+          ignoreNobakVdis: true,
+          name_label: this._getSnapshotNameLabel(vm),
+          unplugVusbs: true,
+        })
+        this.timestamp = Date.now()
+
+        await xapi.setFieldEntries('VM', snapshotRef, 'other_config', {
+          'xo:backup:datetime': formatDateTime(this.timestamp),
+          'xo:backup:job': this._jobId,
+          'xo:backup:schedule': this.scheduleId,
+          'xo:backup:vm': vm.uuid,
+        })
+
+        this.exportedVm = await xapi.getRecord('VM', snapshotRef)
+
+        return this.exportedVm.uuid
+      })
+    } else {
+      this.exportedVm = vm
+      this.timestamp = Date.now()
+    }
+  }
+
+  async _fetchJobSnapshots() {
+    const jobId = this._jobId
+    const vmRef = this.vm.$ref
+    const xapi = this._xapi
+
+    const snapshotsRef = await xapi.getField('VM', vmRef, 'snapshots')
+    const snapshotsOtherConfig = await asyncMap(snapshotsRef, ref => xapi.getField('VM', ref, 'other_config'))
+
+    const snapshots = []
+    snapshotsOtherConfig.forEach((other_config, i) => {
+      if (other_config['xo:backup:job'] === jobId) {
+        snapshots.push({ other_config, $ref: snapshotsRef[i] })
+      }
+    })
+    snapshots.sort((a, b) => (a.other_config['xo:backup:datetime'] < b.other_config['xo:backup:datetime'] ? -1 : 1))
+    this._jobSnapshots = snapshots
+  }
+
+  async _removeUnusedSnapshots() {
+    const allSettings = this.job.settings
+    const baseSettings = this._baseSettings
+    const vmComparisonBasisRef = this._vmComparisonBasis?.$ref
+
+    const snapshotsPerSchedule = groupBy(this._jobSnapshots, _ => _.other_config['xo:backup:schedule'])
+    const xapi = this._xapi
+    await asyncMap(Object.entries(snapshotsPerSchedule), ([scheduleId, snapshots]) => {
+      const settings = {
+        ...baseSettings,
+        ...allSettings[scheduleId],
+        ...allSettings[this.vm.uuid],
+      }
+      return asyncMap(getOldEntries(settings.snapshotRetention, snapshots), ({ $ref }) => {
+        if ($ref !== vmComparisonBasisRef) {
+          return xapi.VM_destroy($ref)
+        }
+      })
+    })
+  }
+
+  async copy() {
+    throw new Error('Not implemented')
+  }
+
+  _getWriters() {
+    throw new Error('Not implemented')
+  }
+
+  _mustDoSnapshot() {
+    throw new Error('Not implemented')
+  }
+
+  async _selectBaseVm() {
+    throw new Error('Not implemented')
+  }
+
+  async run($defer) {
+    const settings = this._settings
+    assert(
+      !settings.offlineBackup || settings.snapshotRetention === 0,
+      'offlineBackup is not compatible with snapshotRetention'
+    )
+
+    await this._callWriters(async writer => {
+      await writer.beforeBackup()
+      $defer(async () => {
+        await writer.afterBackup()
+      })
+    }, 'writer.beforeBackup()')
+
+    await this._fetchJobSnapshots()
+
+    // will only do something during incremental Backup
+    await this._selectBaseVm()
+
+    await this._cleanMetadata()
+    await this._removeUnusedSnapshots()
+
+    const { vm } = this
+    const isRunning = vm.power_state === 'Running'
+    const startAfter = isRunning && (settings.offlineBackup ? 'backup' : settings.offlineSnapshot && 'snapshot')
+    if (startAfter) {
+      await vm.$callAsync('clean_shutdown')
+    }
+
+    try {
+      await this._snapshot()
+      if (startAfter === 'snapshot') {
+        ignoreErrors.call(vm.$callAsync('start', false, false))
+      }
+
+      if (this._writers.size !== 0) {
+        await this._copy()
+      }
+    } finally {
+      if (startAfter) {
+        ignoreErrors.call(vm.$callAsync('start', false, false))
+      }
+
+      await this._fetchJobSnapshots()
+      await this._removeUnusedSnapshots()
+    }
+    await this._healthCheck()
+  }
+}
+exports.AbstractXapiVmBackup = AbstractXapiVmBackup
+
+decorateMethodsWith(AbstractXapiVmBackup, {
+  run: defer,
+})

@xen-orchestra/backups/_backupJob/VmBackup/FullRemoteVmBackup.js

@@ -0,0 +1,43 @@
+'use strict'
+
+const { decorateMethodsWith } = require('@vates/decorate-with')
+const { defer } = require('golike-defer')
+const { AbstractRemoteVmBackup } = require('./AbstractRemoteVmBackup')
+const { FullRemoteWriter } = require('./writers/FullRemoteWriter')
+const { forkStreamUnpipe } = require('../forkStreamUnpipe')
+
+const FullRemoteVmBackup = class FullRemoteVmBackup extends AbstractRemoteVmBackup {
+  _getRemoteWriter() {
+    return FullRemoteWriter
+  }
+  async _run($defer) {
+    const transferList = await this._computeTransferList(({ mode }) => mode === 'full')
+
+    await this._callWriters(async writer => {
+      await writer.beforeBackup()
+      $defer(async () => {
+        await writer.afterBackup()
+      })
+    }, 'writer.beforeBackup()')
+
+    for (const metadata of transferList) {
+      const stream = await this._sourceRemoteAdapter.readFullVmBackup(metadata)
+      // @todo should skip if backup is already there (success on only one remote)
+      await this._callWriters(
+        writer =>
+          writer.run({
+            stream: forkStreamUnpipe(stream),
+            timestamp: metadata.timestamp,
+            vm: metadata.vm,
+            vmSnapshot: metadata.vmSnapshot,
+          }),
+        'writer.run()'
+      )
+    }
+  }
+}
+
+exports.FullRemoteVmBackup = FullRemoteVmBackup
+decorateMethodsWith(FullRemoteVmBackup, {
+  _run: defer,
+})

@xen-orchestra/backups/_backupJob/VmBackup/FullXapiVmBackup.js

@@ -0,0 +1,63 @@
+'use strict'
+
+const { createLogger } = require('@xen-orchestra/log')
+
+const { forkStreamUnpipe } = require('../forkStreamUnpipe.js')
+const { watchStreamSize } = require('../../_watchStreamSize.js')
+const { FullRemoteWriter } = require('./writers/FullRemoteWriter.js')
+const { FullXapiWriter } = require('./writers/FullXapiWriter.js')
+const { AbstractXapiVmBackup } = require('./AbstractXapiVMBackup.js')
+
+const { debug } = createLogger('xo:backups:FullVmBackup')
+
+class FullXapiVmBackup extends AbstractXapiVmBackup {
+  _getWriters() {
+    return [FullRemoteWriter, FullXapiWriter]
+  }
+
+  _mustDoSnapshot() {
+    const { vm } = this
+
+    const settings = this._settings
+    return (
+      settings.unconditionalSnapshot ||
+      (!settings.offlineBackup && vm.power_state === 'Running') ||
+      settings.snapshotRetention !== 0
+    )
+  }
+  _selectBaseVm() {}
+
+  async _copy() {
+    const { compression } = this.job
+    const stream = this._throttleStream(
+      await this._xapi.VM_export(this.exportedVm.$ref, {
+        compress: Boolean(compression) && (compression === 'native' ? 'gzip' : 'zstd'),
+        useSnapshot: false,
+      })
+    )
+    const sizeContainer = watchStreamSize(stream)
+
+    const timestamp = Date.now()
+
+    await this._callWriters(
+      writer =>
+        writer.run({
+          sizeContainer,
+          stream: forkStreamUnpipe(stream),
+          timestamp,
+        }),
+      'writer.run()'
+    )
+
+    const { size } = sizeContainer
+    const end = Date.now()
+    const duration = end - timestamp
+    debug('transfer complete', {
+      duration,
+      speed: duration !== 0 ? (size * 1e3) / 1024 / 1024 / duration : 0,
+      size,
+    })
+    this._healthCheck()
+  }
+}
+exports.FullXapiVmBackup = FullXapiVmBackup

@xen-orchestra/backups/_backupJob/VmBackup/IncrementalRemoteVmBackup.js

@@ -0,0 +1,64 @@
+'use strict'
+const assert = require('node:assert')
+
+const { decorateMethodsWith } = require('@vates/decorate-with')
+const { defer } = require('golike-defer')
+const { AbstractRemoteVmBackup } = require('./AbstractRemoteVmBackup')
+const { mapValues } = require('lodash')
+const { IncrementalRemoteWriter } = require('./writers/IncrementalRemoteWriter')
+const { forkStreamUnpipe } = require('../forkStreamUnpipe')
+const { Task } = require('../../Task')
+
+const forkDeltaExport = deltaExport =>
+  Object.create(deltaExport, {
+    streams: {
+      value: mapValues(deltaExport.streams, forkStreamUnpipe),
+    },
+  })
+
+class IncrementalRemoteVmBackup extends AbstractRemoteVmBackup {
+  _getRemoteWriter() {
+    return IncrementalRemoteWriter
+  }
+  async _run($defer) {
+    const transferList = await this._computeTransferList(({ mode }) => mode === 'delta')
+    await this._callWriters(async writer => {
+      await writer.beforeBackup()
+      $defer(async () => {
+        await writer.afterBackup()
+      })
+    }, 'writer.beforeBackup()')
+
+    if (transferList.length > 0) {
+      for (const metadata of transferList) {
+        assert.strictEqual(metadata.mode, 'delta')
+
+        await this._callWriters(writer => writer.prepare({ isBase: metadata.isBase }), 'writer.prepare()')
+        const incrementalExport = await this._sourceRemoteAdapter.readIncrementalVmBackup(metadata, undefined, {
+          useSynthetic: false,
+        })
+
+        incrementalExport.streams = mapValues(incrementalExport.streams, this._throttleStream)
+        await this._callWriters(
+          writer =>
+            writer.transfer({
+              deltaExport: forkDeltaExport(incrementalExport),
+              timestamp: metadata.timestamp,
+              vm: metadata.vm,
+              vmSnapshot: metadata.vmSnapshot,
+            }),
+          'writer.transfer()'
+        )
+        await this._callWriters(writer => writer.cleanup(), 'writer.cleanup()')
+      }
+      this._healthCheck()
+    } else {
+      Task.info('No new data to upload for this VM')
+    }
+  }
+}
+
+exports.IncrementalRemoteVmBackup = IncrementalRemoteVmBackup
+decorateMethodsWith(IncrementalRemoteVmBackup, {
+  _run: defer,
+})

@xen-orchestra/backups/_backupJob/VmBackup/IncrementalXapiVmBackup.js

@@ -0,0 +1,173 @@
+'use strict'
+
+const findLast = require('lodash/findLast.js')
+const keyBy = require('lodash/keyBy.js')
+const mapValues = require('lodash/mapValues.js')
+const vhdStreamValidator = require('vhd-lib/vhdStreamValidator.js')
+const { asyncMap } = require('@xen-orchestra/async-map')
+const { createLogger } = require('@xen-orchestra/log')
+const { pipeline } = require('node:stream')
+
+const { exportIncrementalVm } = require('../../_incrementalVm.js')
+const { forkStreamUnpipe } = require('../forkStreamUnpipe.js')
+const { Task } = require('../../Task.js')
+const { watchStreamSize } = require('../../_watchStreamSize.js')
+
+const { IncrementalRemoteWriter } = require('./writers/IncrementalRemoteWriter.js')
+const { IncrementalXapiWriter } = require('./writers/IncrementalXapiWriter.js')
+const { AbstractXapiVmBackup } = require('./AbstractXapiVMBackup.js')
+
+const { debug } = createLogger('xo:backups:VmBackup')
+
+const forkDeltaExport = deltaExport =>
+  Object.create(deltaExport, {
+    streams: {
+      value: mapValues(deltaExport.streams, forkStreamUnpipe),
+    },
+  })
+const noop = Function.prototype
+
+class IncrementalXapiVmBackup extends AbstractXapiVmBackup {
+  _getWriters() {
+    return [IncrementalRemoteWriter, IncrementalXapiWriter]
+  }
+
+  _mustDoSnapshot() {
+    return true
+  }
+
+  async _copy() {
+    const { exportedVm } = this
+    const vmComparisonBasis = this._vmComparisonBasis
+    const fullVdisRequired = this._fullVdisRequired
+
+    const isBase = fullVdisRequired === undefined || fullVdisRequired.size !== 0
+
+    await this._callWriters(writer => writer.prepare({ isBase }), 'writer.prepare()')
+
+    const incrementalExport = await exportIncrementalVm(exportedVm, vmComparisonBasis, {
+      fullVdisRequired,
+    })
+    // since NBD is network based, if one disk use nbd , all the disk use them
+    // except the suspended VDI
+    if (Object.values(incrementalExport.streams).some(({ _nbd }) => _nbd)) {
+      Task.info('Transfer data using NBD')
+    }
+    const sizeContainers = mapValues(incrementalExport.streams, stream => watchStreamSize(stream))
+
+    if (this._settings.validateVhdStreams) {
+      incrementalExport.streams = mapValues(incrementalExport.streams, stream =>
+        pipeline(stream, vhdStreamValidator, noop)
+      )
+    }
+
+    incrementalExport.streams = mapValues(incrementalExport.streams, this._throttleStream)
+
+    const timestamp = Date.now()
+
+    await this._callWriters(
+      writer =>
+        writer.transfer({
+          deltaExport: forkDeltaExport(incrementalExport),
+          sizeContainers,
+          timestamp,
+        }),
+      'writer.transfer()'
+    )
+
+    this._vmComparisonBasis = exportedVm
+
+    if (vmComparisonBasis !== undefined) {
+      await exportedVm.update_other_config(
+        'xo:backup:deltaChainLength',
+        String(+(vmComparisonBasis.other_config['xo:backup:deltaChainLength'] ?? 0) + 1)
+      )
+    }
+
+    // not the case if offlineBackup
+    if (exportedVm.is_a_snapshot) {
+      await exportedVm.update_other_config('xo:backup:exported', 'true')
+    }
+
+    const size = Object.values(sizeContainers).reduce((sum, { size }) => sum + size, 0)
+    const end = Date.now()
+    const duration = end - timestamp
+    debug('transfer complete', {
+      duration,
+      speed: duration !== 0 ? (size * 1e3) / 1024 / 1024 / duration : 0,
+      size,
+    })
+
+    await this._callWriters(writer => writer.cleanup(), 'writer.cleanup()')
+  }
+
+  async _selectBaseVm() {
+    const xapi = this._xapi
+
+    let baseVm = findLast(this._jobSnapshots, _ => 'xo:backup:exported' in _.other_config)
+    if (baseVm === undefined) {
+      debug('no base VM found')
+      return
+    }
+
+    const fullInterval = this._settings.fullInterval
+    const deltaChainLength = +(baseVm.other_config['xo:backup:deltaChainLength'] ?? 0) + 1
+    if (!(fullInterval === 0 || fullInterval > deltaChainLength)) {
+      debug('not using base VM because fullInterval reached')
+      return
+    }
+
+    const srcVdis = keyBy(await xapi.getRecords('VDI', await this.vm.$getDisks()), '$ref')
+
+    // resolve full record
+    baseVm = await xapi.getRecord('VM', baseVm.$ref)
+
+    const baseUuidToSrcVdi = new Map()
+    await asyncMap(await baseVm.$getDisks(), async baseRef => {
+      const [baseUuid, snapshotOf] = await Promise.all([
+        xapi.getField('VDI', baseRef, 'uuid'),
+        xapi.getField('VDI', baseRef, 'snapshot_of'),
+      ])
+      const srcVdi = srcVdis[snapshotOf]
+      if (srcVdi !== undefined) {
+        baseUuidToSrcVdi.set(baseUuid, srcVdi)
+      } else {
+        debug('ignore snapshot VDI because no longer present on VM', {
+          vdi: baseUuid,
+        })
+      }
+    })
+
+    const presentBaseVdis = new Map(baseUuidToSrcVdi)
+    await this._callWriters(
+      writer => presentBaseVdis.size !== 0 && writer.checkBaseVdis(presentBaseVdis, baseVm),
+      'writer.checkBaseVdis()',
+      false
+    )
+
+    if (presentBaseVdis.size === 0) {
+      debug('no base VM found')
+      return
+    }
+
+    const fullVdisRequired = new Set()
+    baseUuidToSrcVdi.forEach((srcVdi, baseUuid) => {
+      if (presentBaseVdis.has(baseUuid)) {
+        debug('found base VDI', {
+          base: baseUuid,
+          vdi: srcVdi.uuid,
+        })
+      } else {
+        debug('missing base VDI', {
+          base: baseUuid,
+          vdi: srcVdi.uuid,
+        })
+        fullVdisRequired.add(srcVdi.uuid)
+      }
+    })
+
+    this._vmComparisonBasis = baseVm
+    this._fullVdisRequired = fullVdisRequired
+  }
+}
+exports.IncrementalXapiVmBackup = IncrementalXapiVmBackup

@xen-orchestra/backups/_backupJob/VmBackup/writers/FullRemoteWriter.js

@@ -1,13 +1,13 @@
 'use strict'
 
-const { formatFilenameDate } = require('../_filenameDate.js')
+const { formatFilenameDate } = require('../../../_filenameDate.js')
-const { getOldEntries } = require('../_getOldEntries.js')
+const { getOldEntries } = require('./_getOldEntries.js')
-const { Task } = require('../Task.js')
+const { Task } = require('../../../Task.js')
 
-const { MixinBackupWriter } = require('./_MixinBackupWriter.js')
+const { MixinRemoteWriter } = require('./_MixinRemoteWriter.js')
 const { AbstractFullWriter } = require('./_AbstractFullWriter.js')
 
-exports.FullBackupWriter = class FullBackupWriter extends MixinBackupWriter(AbstractFullWriter) {
+exports.FullRemoteWriter = class FullRemoteWriter extends MixinRemoteWriter(AbstractFullWriter) {
   constructor(props) {
     super(props)
 
@@ -26,11 +26,11 @@ exports.FullBackupWriter = class FullBackupWriter extends MixinBackupWriter(Abst
     )
   }
 
-  async _run({ timestamp, sizeContainer, stream }) {
+  async _run({ timestamp, sizeContainer, stream, vm = this._backup.vm, vmSnapshot = this._backup.exportedVm }) {
     const backup = this._backup
     const settings = this._settings
 
-    const { job, scheduleId, vm } = backup
+    const { job, scheduleId } = backup
 
     const adapter = this._adapter
 
@@ -54,7 +54,7 @@ exports.FullBackupWriter = class FullBackupWriter extends MixinBackupWriter(Abst
       timestamp,
       version: '2.0.0',
       vm,
-      vmSnapshot: this._backup.exportedVm,
+      vmSnapshot,
       xva: './' + dataBasename,
     }
 
@@ -67,9 +67,9 @@ exports.FullBackupWriter = class FullBackupWriter extends MixinBackupWriter(Abst
       await adapter.outputStream(dataFilename, stream, {
         validator: tmpPath => adapter.isValidXva(tmpPath),
       })
-      return { size: sizeContainer.size }
+      return { size: sizeContainer?.size }
     })
-    metadata.size = sizeContainer.size
+    metadata.size = sizeContainer?.size ?? 0
     this._metadataFileName = await adapter.writeVmBackupMetadata(vm.uuid, metadata)
 
     if (!deleteFirst) {

@xen-orchestra/backups/_backupJob/VmBackup/writers/FullXapiWriter.js

@@ -4,15 +4,15 @@ const ignoreErrors = require('promise-toolbox/ignoreErrors')
 const { asyncMap, asyncMapSettled } = require('@xen-orchestra/async-map')
 const { formatDateTime } = require('@xen-orchestra/xapi')
 
-const { formatFilenameDate } = require('../_filenameDate.js')
+const { formatFilenameDate } = require('../../../_filenameDate.js')
-const { getOldEntries } = require('../_getOldEntries.js')
+const { getOldEntries } = require('./_getOldEntries.js')
-const { Task } = require('../Task.js')
+const { Task } = require('../../../Task.js')
 
 const { AbstractFullWriter } = require('./_AbstractFullWriter.js')
-const { MixinReplicationWriter } = require('./_MixinReplicationWriter.js')
+const { MixinXapiWriter } = require('./_MixinXapiWriter.js')
 const { listReplicatedVms } = require('./_listReplicatedVms.js')
 
-exports.FullReplicationWriter = class FullReplicationWriter extends MixinReplicationWriter(AbstractFullWriter) {
+exports.FullXapiWriter = class FullXapiWriter extends MixinXapiWriter(AbstractFullWriter) {
   constructor(props) {
     super(props)
 

@xen-orchestra/backups/_backupJob/VmBackup/writers/IncrementalRemoteWriter.js

@@ -11,19 +11,19 @@ const { decorateClass } = require('@vates/decorate-with')
 const { defer } = require('golike-defer')
 const { dirname } = require('path')
 
-const { formatFilenameDate } = require('../_filenameDate.js')
+const { formatFilenameDate } = require('../../../_filenameDate.js')
-const { getOldEntries } = require('../_getOldEntries.js')
+const { getOldEntries } = require('./_getOldEntries.js')
-const { Task } = require('../Task.js')
+const { Task } = require('../../../Task.js')
 
-const { MixinBackupWriter } = require('./_MixinBackupWriter.js')
+const { MixinRemoteWriter } = require('./_MixinRemoteWriter.js')
-const { AbstractDeltaWriter } = require('./_AbstractDeltaWriter.js')
+const { AbstractIncrementalWriter } = require('./_AbstractIncrementalWriter.js')
 const { checkVhd } = require('./_checkVhd.js')
 const { packUuid } = require('./_packUuid.js')
 const { Disposable } = require('promise-toolbox')
 
-const { warn } = createLogger('xo:backups:DeltaBackupWriter')
+const { warn } = createLogger('xo:backups:IncrementalRemoteWriter')
 
-class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
+class IncrementalRemoteWriter extends MixinRemoteWriter(AbstractIncrementalWriter) {
   async checkBaseVdis(baseUuidToSrcVdi) {
     const { handler } = this._adapter
     const backup = this._backup
@@ -70,13 +70,13 @@ class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
     return this._cleanVm({ merge: true })
   }
 
-  prepare({ isFull }) {
+  prepare({ isBase }) {
     // create the task related to this export and ensure all methods are called in this context
     const task = new Task({
       name: 'export',
       data: {
         id: this._remoteId,
-        isFull,
+        isBase,
         type: 'remote',
       },
     })
@@ -130,15 +130,15 @@ class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
 
     // delete sequentially from newest to oldest to avoid unnecessary merges
     for (let i = oldEntries.length; i-- > 0; ) {
-      await adapter.deleteDeltaVmBackups([oldEntries[i]])
+      await adapter.deleteIncrementalVmBackups([oldEntries[i]])
     }
   }
 
-  async _transfer($defer, { timestamp, deltaExport }) {
+  async _transfer($defer, { timestamp, deltaExport, vm = this._backup.vm, vmSnapshot = this._backup.exportedVm }) {
     const adapter = this._adapter
     const backup = this._backup
 
-    const { job, scheduleId, vm } = backup
+    const { job, scheduleId } = backup
 
     const jobId = job.id
     const handler = adapter.handler
@@ -169,7 +169,7 @@ class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
       vifs: deltaExport.vifs,
       vhds,
       vm,
-      vmSnapshot: this._backup.exportedVm,
+      vmSnapshot,
     }
 
     const { size } = await Task.run({ name: 'transfer' }, async () => {
@@ -208,7 +208,14 @@ class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
           })
 
           if (isDelta) {
-            await chainVhd(handler, parentPath, handler, path)
+            try {
+              await chainVhd(handler, parentPath, handler, path)
+            } catch (err) {
+              // @todo : check why if chains with full disk
+              if (err.message !== 'cannot chain disk of type 3') {
+                throw err
+              }
+            }
           }
 
           // set the correct UUID in the VHD
@@ -223,10 +230,9 @@ class DeltaBackupWriter extends MixinBackupWriter(AbstractDeltaWriter) {
     })
     metadataContent.size = size
     this._metadataFileName = await adapter.writeVmBackupMetadata(vm.uuid, metadataContent)
-
     // TODO: run cleanup?
   }
 }
-exports.DeltaBackupWriter = decorateClass(DeltaBackupWriter, {
+exports.IncrementalRemoteWriter = decorateClass(IncrementalRemoteWriter, {
   _transfer: defer,
 })

@xen-orchestra/backups/_backupJob/VmBackup/writers/IncrementalXapiWriter.js

@@ -4,16 +4,16 @@ const { asyncMap, asyncMapSettled } = require('@xen-orchestra/async-map')
 const ignoreErrors = require('promise-toolbox/ignoreErrors')
 const { formatDateTime } = require('@xen-orchestra/xapi')
 
-const { formatFilenameDate } = require('../_filenameDate.js')
+const { formatFilenameDate } = require('../../../_filenameDate.js')
-const { getOldEntries } = require('../_getOldEntries.js')
+const { getOldEntries } = require('./_getOldEntries.js')
-const { importDeltaVm, TAG_COPY_SRC } = require('../_deltaVm.js')
+const { importIncrementalVm, TAG_COPY_SRC } = require('../../../_incrementalVm.js')
-const { Task } = require('../Task.js')
+const { Task } = require('../../../Task.js')
 
-const { AbstractDeltaWriter } = require('./_AbstractDeltaWriter.js')
+const { AbstractIncrementalWriter } = require('./_AbstractIncrementalWriter.js')
-const { MixinReplicationWriter } = require('./_MixinReplicationWriter.js')
+const { MixinXapiWriter } = require('./_MixinXapiWriter.js')
 const { listReplicatedVms } = require('./_listReplicatedVms.js')
 
-exports.DeltaReplicationWriter = class DeltaReplicationWriter extends MixinReplicationWriter(AbstractDeltaWriter) {
+exports.IncrementalXapiWriter = class IncrementalXapiWriter extends MixinXapiWriter(AbstractIncrementalWriter) {
   async checkBaseVdis(baseUuidToSrcVdi, baseVm) {
     const sr = this._sr
     const replicatedVm = listReplicatedVms(sr.$xapi, this._backup.job.id, sr.uuid, this._backup.vm.uuid).find(
@@ -38,13 +38,13 @@ exports.DeltaReplicationWriter = class DeltaReplicationWriter extends MixinRepli
     }
   }
 
-  prepare({ isFull }) {
+  prepare({ isBase }) {
     // create the task related to this export and ensure all methods are called in this context
     const task = new Task({
       name: 'export',
       data: {
         id: this._sr.uuid,
-        isFull,
+        isBase,
         name_label: this._sr.name_label,
         type: 'SR',
       },
@@ -90,7 +90,7 @@ exports.DeltaReplicationWriter = class DeltaReplicationWriter extends MixinRepli
 
     let targetVmRef
     await Task.run({ name: 'transfer' }, async () => {
-      targetVmRef = await importDeltaVm(
+      targetVmRef = await importIncrementalVm(
         {
           __proto__: deltaExport,
           vm: {

@xen-orchestra/backups/_backupJob/VmBackup/writers/_AbstractIncrementalWriter.js

@@ -2,7 +2,7 @@
 
 const { AbstractWriter } = require('./_AbstractWriter.js')
 
-exports.AbstractDeltaWriter = class AbstractDeltaWriter extends AbstractWriter {
+exports.AbstractIncrementalWriter = class AbstractIncrementalWriter extends AbstractWriter {
   checkBaseVdis(baseUuidToSrcVdi, baseVm) {
     throw new Error('Not implemented')
   }
@@ -11,7 +11,7 @@ exports.AbstractDeltaWriter = class AbstractDeltaWriter extends AbstractWriter {
     throw new Error('Not implemented')
   }
 
-  prepare({ isFull }) {
+  prepare({ isBase }) {
     throw new Error('Not implemented')
   }
 

@xen-orchestra/backups/_backupJob/VmBackup/writers/_MixinRemoteWriter.js

@@ -4,17 +4,17 @@ const { createLogger } = require('@xen-orchestra/log')
 const { join } = require('path')
 
 const assert = require('assert')
-const { formatFilenameDate } = require('../_filenameDate.js')
+const { formatFilenameDate } = require('../../../_filenameDate.js')
-const { getVmBackupDir } = require('../_getVmBackupDir.js')
+const { getVmBackupDir } = require('../../../_getVmBackupDir.js')
-const { HealthCheckVmBackup } = require('../HealthCheckVmBackup.js')
+const { HealthCheckVmBackup } = require('../../../HealthCheckVmBackup.js')
-const { ImportVmBackup } = require('../ImportVmBackup.js')
+const { ImportVmBackup } = require('../../../ImportVmBackup.js')
-const { Task } = require('../Task.js')
+const { Task } = require('../../../Task.js')
-const MergeWorker = require('../merge-worker/index.js')
+const MergeWorker = require('../../../merge-worker/index.js')
 
-const { info, warn } = createLogger('xo:backups:MixinBackupWriter')
+const { info, warn } = createLogger('xo:backups:MixinRemoteWriter')
 
-exports.MixinBackupWriter = (BaseClass = Object) =>
+exports.MixinRemoteWriter = (BaseClass = Object) =>
-  class MixinBackupWriter extends BaseClass {
+  class MixinRemoteWriter extends BaseClass {
     #lock
 
     constructor({ remoteId, ...rest }) {

@xen-orchestra/backups/_backupJob/VmBackup/writers/_MixinXapiWriter.js

@@ -1,8 +1,8 @@
 'use strict'
 
-const { Task } = require('../Task')
+const { Task } = require('../../../Task')
 const assert = require('node:assert/strict')
-const { HealthCheckVmBackup } = require('../HealthCheckVmBackup')
+const { HealthCheckVmBackup } = require('../../../HealthCheckVmBackup')
 
 function extractOpaqueRef(str) {
   const OPAQUE_REF_RE = /OpaqueRef:[0-9a-z-]+/
@@ -12,8 +12,8 @@ function extractOpaqueRef(str) {
   }
   return matches[0]
 }
-exports.MixinReplicationWriter = (BaseClass = Object) =>
+exports.MixinXapiWriter = (BaseClass = Object) =>
-  class MixinReplicationWriter extends BaseClass {
+  class MixinXapiWriter extends BaseClass {
     constructor({ sr, ...rest }) {
       super(rest)
 

@xen-orchestra/backups/_backupJob/XapiVmBackupJob.js

@@ -0,0 +1,138 @@
+'use strict'
+
+const { asyncMapSettled } = require('@xen-orchestra/async-map')
+const Disposable = require('promise-toolbox/Disposable')
+const { limitConcurrency } = require('limit-concurrency-decorator')
+
+const { extractIdsFromSimplePattern } = require('../extractIdsFromSimplePattern.js')
+const { Task } = require('../Task.js')
+const createStreamThrottle = require('./createStreamThrottle.js')
+const { IncrementalXapiVmBackup } = require('./VmBackup/IncrementalXapiVmBackup.js')
+const { FullXapiVmBackup } = require('./VmBackup/FullXapiVmBackup.js')
+const { DEFAULT_SETTINGS, AbstractBackupJob } = require('./AbstractBackupJob.js')
+const { runTask } = require('./runTask.js')
+const { getAdaptersByRemote } = require('./getAdapterByRemote.js')
+
+const DEFAULT_XAPI_VM_SETTINGS = {
+  bypassVdiChainsCheck: false,
+  checkpointSnapshot: false,
+  concurrency: 2,
+  copyRetention: 0,
+  deleteFirst: false,
+  exportRetention: 0,
+  fullInterval: 0,
+  healthCheckSr: undefined,
+  healthCheckVmsWithTags: [],
+  maxExportRate: 0,
+  maxMergedDeltasPerRun: Infinity,
+  offlineBackup: false,
+  offlineSnapshot: false,
+  snapshotRetention: 0,
+  timeout: 0,
+  useNbd: false,
+  unconditionalSnapshot: false,
+  validateVhdStreams: false,
+  vmTimeout: 0,
+}
+
+exports.XapiVmBackupJob = class XapiVmBackupJob extends AbstractBackupJob {
+  _computeBaseSettings(config, job) {
+    const baseSettings = { ...DEFAULT_SETTINGS }
+    Object.assign(baseSettings, DEFAULT_XAPI_VM_SETTINGS, config.defaultSettings, config.vm?.defaultSettings)
+    Object.assign(baseSettings, job.settings[''])
+    return baseSettings
+  }
+
+  async run() {
+    const job = this._job
+
+    // FIXME: proper SimpleIdPattern handling
+    const getSnapshotNameLabel = this._getSnapshotNameLabel
+    const schedule = this._schedule
+    const settings = this._settings
+
+    const throttleStream = createStreamThrottle(settings.maxExportRate)
+
+    const config = this._config
+    await Disposable.use(
+      Disposable.all(
+        extractIdsFromSimplePattern(job.srs).map(id =>
+          this._getRecord('SR', id).catch(error => {
+            runTask(
+              {
+                name: 'get SR record',
+                data: { type: 'SR', id },
+              },
+              () => Promise.reject(error)
+            )
+          })
+        )
+      ),
+      Disposable.all(extractIdsFromSimplePattern(job.remotes).map(id => this._getAdapter(id))),
+      () => (settings.healthCheckSr !== undefined ? this._getRecord('SR', settings.healthCheckSr) : undefined),
+      async (srs, remoteAdapters, healthCheckSr) => {
+        // remove adapters that failed (already handled)
+        remoteAdapters = remoteAdapters.filter(_ => _ !== undefined)
+
+        // remove srs that failed (already handled)
+        srs = srs.filter(_ => _ !== undefined)
+
+        if (remoteAdapters.length === 0 && srs.length === 0 && settings.snapshotRetention === 0) {
+          return
+        }
+
+        const vmIds = extractIdsFromSimplePattern(job.vms)
+
+        Task.info('vms', { vms: vmIds })
+
+        remoteAdapters = getAdaptersByRemote(remoteAdapters)
+
+        const allSettings = this._job.settings
+        const baseSettings = this._baseSettings
+
+        const handleVm = vmUuid => {
+          const taskStart = { name: 'backup VM', data: { type: 'VM', id: vmUuid } }
+
+          return this._getRecord('VM', vmUuid).then(
+            disposableVm =>
+              Disposable.use(disposableVm, vm => {
+                taskStart.data.name_label = vm.name_label
+                return runTask(taskStart, () => {
+                  const opts = {
+                    baseSettings,
+                    config,
+                    getSnapshotNameLabel,
+                    healthCheckSr,
+                    job,
+                    remoteAdapters,
+                    schedule,
+                    settings: { ...settings, ...allSettings[vm.uuid] },
+                    srs,
+                    throttleStream,
+                    vm,
+                  }
+                  let vmBackup
+                  if (job.mode === 'delta') {
+                    vmBackup = new IncrementalXapiVmBackup(opts)
+                  } else {
+                    if (job.mode === 'full') {
+                      vmBackup = new FullXapiVmBackup(opts)
+                    } else {
+                      throw new Error(`Job mode ${job.mode} not implemented`)
+                    }
+                  }
+                  return vmBackup.run()
+                })
+              }),
+            error =>
+              runTask(taskStart, () => {
+                throw error
+              })
+          )
+        }
+        const { concurrency } = settings
+        await asyncMapSettled(vmIds, concurrency === 0 ? handleVm : limitConcurrency(concurrency)(handleVm))
+      }
+    )
+  }
+}

@xen-orchestra/backups/_backupJob/XoMetadataBackup.js

@@ -2,9 +2,9 @@
 
 const { asyncMap } = require('@xen-orchestra/async-map')
 
-const { DIR_XO_CONFIG_BACKUPS } = require('./RemoteAdapter.js')
+const { DIR_XO_CONFIG_BACKUPS } = require('../RemoteAdapter.js')
-const { formatFilenameDate } = require('./_filenameDate.js')
+const { formatFilenameDate } = require('../_filenameDate.js')
-const { Task } = require('./Task.js')
+const { Task } = require('../Task.js')
 
 exports.XoMetadataBackup = class XoMetadataBackup {
   constructor({ config, job, remoteAdapters, schedule, settings }) {

@xen-orchestra/backups/_backupJob/getAdapterByRemote.js

@@ -0,0 +1,9 @@
+'use strict'
+
+exports.getAdaptersByRemote = adapters => {
+  const adaptersByRemote = {}
+  adapters.forEach(({ adapter, remoteId }) => {
+    adaptersByRemote[remoteId] = adapter
+  })
+  return adaptersByRemote
+}

@xen-orchestra/backups/_backupJob/runTask.js

@@ -0,0 +1,7 @@
+'use strict'
+
+const { Task } = require('../Task')
+
+const noop = Function.prototype
+
+exports.runTask = (...args) => Task.run(...args).catch(noop) // errors are handled by logs

@xen-orchestra/backups/_backupWorker.js

@@ -16,7 +16,7 @@ const { getHandler } = require('@xen-orchestra/fs')
 const { parseDuration } = require('@vates/parse-duration')
 const { Xapi } = require('@xen-orchestra/xapi')
 
-const { Backup } = require('./Backup.js')
+const { instantiateBackupJob } = require('./backupJob.js')
 const { RemoteAdapter } = require('./RemoteAdapter.js')
 const { Task } = require('./Task.js')
 
@@ -48,7 +48,7 @@ class BackupWorker {
   }
 
   run() {
-    return new Backup({
+    return instantiateBackupJob({
       config: this.#config,
       getAdapter: remoteId => this.getAdapter(this.#remotes[remoteId]),
       getConnectedRecord: Disposable.factory(async function* getConnectedRecord(type, uuid) {

@xen-orchestra/backups/_incrementalVm.js

@@ -33,9 +33,9 @@ const resolveUuid = async (xapi, cache, uuid, type) => {
   return ref
 }
 
-exports.exportDeltaVm = async function exportDeltaVm(
+exports.exportIncrementalVm = async function exportIncrementalVm(
   vm,
-  baseVm,
+  vmComparisonBasis,
   {
     cancelToken = CancelToken.none,
 
@@ -46,12 +46,12 @@ exports.exportDeltaVm = async function exportDeltaVm(
   } = {}
 ) {
   // refs of VM's VDIs → base's VDIs.
-  const baseVdis = {}
+  const vdisCompaisonBasis = {}
-  baseVm &&
+  vmComparisonBasis &&
-    baseVm.$VBDs.forEach(vbd => {
+    vmComparisonBasis.$VBDs.forEach(vbd => {
       let vdi, snapshotOf
       if ((vdi = vbd.$VDI) && (snapshotOf = vdi.$snapshot_of) && !fullVdisRequired.has(snapshotOf.uuid)) {
-        baseVdis[vdi.snapshot_of] = vdi
+        vdisCompaisonBasis[vdi.snapshot_of] = vdi
       }
     })
 
@@ -74,20 +74,20 @@ exports.exportDeltaVm = async function exportDeltaVm(
     }
 
     // Look for a snapshot of this vdi in the base VM.
-    const baseVdi = baseVdis[vdi.snapshot_of]
+    const vdiComparisonBasis = vdisCompaisonBasis[vdi.snapshot_of]
 
     vdis[vdiRef] = {
       ...vdi,
       other_config: {
         ...vdi.other_config,
-        [TAG_BASE_DELTA]: baseVdi && !disableBaseTags ? baseVdi.uuid : undefined,
+        [TAG_BASE_DELTA]: vdiComparisonBasis && !disableBaseTags ? vdiComparisonBasis.uuid : undefined,
       },
       $snapshot_of$uuid: vdi.$snapshot_of?.uuid,
       $SR$uuid: vdi.$SR.uuid,
     }
 
     streams[`${vdiRef}.vhd`] = await vdi.$exportContent({
-      baseRef: baseVdi?.$ref,
+      baseRef: vdiComparisonBasis?.$ref,
       cancelToken,
       format: 'vhd',
     })
@@ -126,10 +126,10 @@ exports.exportDeltaVm = async function exportDeltaVm(
       vm: {
         ...vm,
         other_config:
-          baseVm && !disableBaseTags
+          vmComparisonBasis && !disableBaseTags
             ? {
                 ...vm.other_config,
-                [TAG_BASE_DELTA]: baseVm.uuid,
+                [TAG_BASE_DELTA]: vmComparisonBasis.uuid,
               }
             : omit(vm.other_config, TAG_BASE_DELTA),
       },
@@ -143,18 +143,18 @@ exports.exportDeltaVm = async function exportDeltaVm(
   )
 }
 
-exports.importDeltaVm = defer(async function importDeltaVm(
+exports.importIncrementalVm = defer(async function importIncrementalVm(
   $defer,
-  deltaVm,
+  incrementalVm,
   sr,
   { cancelToken = CancelToken.none, detectBase = true, mapVdisSrs = {}, newMacAddresses = false } = {}
 ) {
-  const { version } = deltaVm
+  const { version } = incrementalVm
   if (compareVersions(version, '1.0.0') < 0) {
     throw new Error(`Unsupported delta backup version: ${version}`)
   }
 
-  const vmRecord = deltaVm.vm
+  const vmRecord = incrementalVm.vm
   const xapi = sr.$xapi
 
   let baseVm
@@ -183,7 +183,7 @@ exports.importDeltaVm = defer(async function importDeltaVm(
         baseVdis[vbd.VDI] = vbd.$VDI
       }
     })
-  const vdiRecords = deltaVm.vdis
+  const vdiRecords = incrementalVm.vdis
 
   // 0. Create suspend_VDI
   let suspendVdi
@@ -240,7 +240,7 @@ exports.importDeltaVm = defer(async function importDeltaVm(
   await asyncMap(await xapi.getField('VM', vmRef, 'VBDs'), ref => ignoreErrors.call(xapi.call('VBD.destroy', ref)))
 
   // 3. Create VDIs & VBDs.
-  const vbdRecords = deltaVm.vbds
+  const vbdRecords = incrementalVm.vbds
   const vbds = groupBy(vbdRecords, 'VDI')
   const newVdis = {}
   await asyncMap(Object.keys(vdiRecords), async vdiRef => {
@@ -309,7 +309,7 @@ exports.importDeltaVm = defer(async function importDeltaVm(
     }
   })
 
-  const { streams } = deltaVm
+  const { streams } = incrementalVm
 
   await Promise.all([
     // Import VDI contents.
@@ -326,7 +326,7 @@ exports.importDeltaVm = defer(async function importDeltaVm(
     }),
 
     // Create VIFs.
-    asyncMap(Object.values(deltaVm.vifs), vif => {
+    asyncMap(Object.values(incrementalVm.vifs), vif => {
       let network = vif.$network$uuid && xapi.getObjectByUuid(vif.$network$uuid, undefined)
 
       if (network === undefined) {
@@ -358,8 +358,8 @@ exports.importDeltaVm = defer(async function importDeltaVm(
   ])
 
   await Promise.all([
-    deltaVm.vm.ha_always_run && xapi.setField('VM', vmRef, 'ha_always_run', true),
+    incrementalVm.vm.ha_always_run && xapi.setField('VM', vmRef, 'ha_always_run', true),
-    xapi.setField('VM', vmRef, 'name_label', deltaVm.vm.name_label),
+    xapi.setField('VM', vmRef, 'name_label', incrementalVm.vm.name_label),
   ])
 
   return vmRef

@xen-orchestra/backups/backupJob.js

@@ -0,0 +1,24 @@
+'use strict'
+
+const { MetadatasBackupJob } = require('./_backupJob/MetadatasBackupJob.js')
+const { RemoteVmBackupJob } = require('./_backupJob/RemoteVmBackupJob.js')
+const { XapiVmBackupJob } = require('./_backupJob/XapiVmBackupJob.js')
+
+exports.instantiateBackupJob = function instantiateBackupJob({
+  config,
+  getAdapter,
+  getConnectedRecord,
+  job,
+  schedule,
+}) {
+  switch (job.type) {
+    case 'backup':
+      return new XapiVmBackupJob({ config, getAdapter, getConnectedRecord, job, schedule })
+    case 'remote-to-remote':
+      return new RemoteVmBackupJob({ config, getAdapter, getConnectedRecord, job, schedule })
+    case 'metadataBackup':
+      return new MetadatasBackupJob({ config, getAdapter, getConnectedRecord, job, schedule })
+    default:
+      throw new Error(`No runners for the backup type ${job.type}`)
+  }
+}

@xen-orchestra/backups/docs/VM backups/README.md

@@ -136,7 +136,7 @@ task.start(message: 'restore', data: { jobId: string, srId: string, time: number
 
 ## API
 
-### Run description object
+### Run description object Metadata / Pool backup
 
 This is a JavaScript object containing all the information necessary to run a backup job.
 
@@ -150,11 +150,65 @@ job:
   # Human readable identifier
   name: string
 
-  # Whether this job is doing Full Backup / Disaster Recovery or
+  # which pools to saved, can be undefined
-  # Delta Backup / Continuous Replication
+  pools : IdPattern
+
+  # which remotes to use
+  remotes: IdPattern
+
+  settings:
+
+    # Used for the whole job
+    '': Settings
+
+    # Used for a specific schedule
+    [ScheduleId]: Settings
+
+    # Used for a specific VM
+    [VmId]: Settings
+  # if defined : backup the xo metadata
+  xoMetadata : string
+
+  type: 'metadataBackup'
+
+# Information necessary to connect to each remote
+remotes:
+  [RemoteId]:
+    url: string
+
+# Indicates which schedule is used for this run
+schedule:
+  id: ScheduleId
+
+# Information necessary to connect to each XAPI
+xapis:
+  [XapiId]:
+    allowUnauthorized: boolean
+    credentials:
+      password: string
+      username: string
+    url: string
+```
+
+### Run description object Vms Xapi to remote and/or Xapi to Xapi
+
+This is a JavaScript object containing all the information necessary to run a backup job.
+
+```coffee
+# Information about the job itself
+job:
+
+  # Unique identifier
+  id: string
+
+  # Human readable identifier
+  name: string
+
+  # Whether this job is doing Full Backup / Full Replication or
+  # Incremental Backup / Incremental Replication
   mode: 'full' | 'delta'
 
-  # For backup jobs, indicates which remotes to use
+  # indicates which remotes used to writes. Can be empty.
   remotes: IdPattern
 
   settings:
@@ -168,10 +222,10 @@ job:
     # Used for a specific VM
     [VmId]: Settings
 
-  # For replication jobs, indicates which SRs to use
+  # indicates which SRs to use for replication jobs. Can be empty.
   srs: IdPattern
 
-  # Here for historical reasons
+  # Here for historical reasons, xapi to remote or xapi to xapi
   type: 'backup'
 
   # Indicates which VMs to backup/replicate
@@ -200,6 +254,62 @@ xapis:
     url: string
 ```
 
+### Run description object Vms remote to remote
+
+This is a JavaScript object containing all the information necessary to run a backup job.
+
+```coffee
+# Information about the job itself
+job:
+
+  # Unique identifier
+  id: string
+
+  # Human readable identifier
+  name: string
+
+  # Whether this job is doing Full Backup / Full Replication or
+  # Incremental Backup / Incremental Replication
+  mode: 'full' | 'delta'
+
+  # Indicates which remotes to write VMs
+  remotes: IdPattern
+
+  settings:
+
+    # Used for the whole job
+    '': Settings
+
+    # Used for a specific schedule
+    [ScheduleId]: Settings
+
+    # Used for a specific VM
+    [VmId]: Settings
+
+  # only transfer data saved by one of theses Job
+  # transfer all if empty
+  sourceJobIds: IdPattern
+
+  # Here for historical reasons, xapi to remote or xapi to xapi
+  type: 'remote-to-remote'
+
+  # Indicates which VMs to backup/replicate
+  vms: IdPattern
+
+# Indicate the remote used to read Vms
+sourceRemote:
+  [ObjectId]: XapiId
+
+# Information necessary to connect to each remote (read or write)
+remotes:
+  [RemoteId]:
+    url: string
+
+# Indicates which schedule is used for this run
+schedule:
+  id: ScheduleId
+```
+
 ### `IdPattern`
 
 For a single object:

@xen-orchestra/proxy/app/mixins/backups.mjs

@@ -1,7 +1,6 @@
 import Disposable from 'promise-toolbox/Disposable'
 import fromCallback from 'promise-toolbox/fromCallback'
 import { asyncMap } from '@xen-orchestra/async-map'
-import { Backup } from '@xen-orchestra/backups/Backup.js'
 import { compose } from '@vates/compose'
 import { createLogger } from '@xen-orchestra/log'
 import { decorateMethodsWith } from '@vates/decorate-with'
@@ -18,6 +17,7 @@ import { RestoreMetadataBackup } from '@xen-orchestra/backups/RestoreMetadataBac
 import { runBackupWorker } from '@xen-orchestra/backups/runBackupWorker.js'
 import { Task } from '@xen-orchestra/backups/Task.js'
 import { Xapi } from '@xen-orchestra/xapi'
+import { instantiateBackupJob } from '@xen-orchestra/backups/backupJob.js'
 
 const noop = Function.prototype
 
@@ -52,7 +52,7 @@ export default class Backups {
       const config = app.config.get('backups')
       if (config.disableWorkers) {
         const { recordToXapi, remotes, xapis, ...rest } = params
-        return new Backup({
+        return instantiateBackupJob({
           ...rest,
 
           config,

packages/xo-server-test/src/backupNg/__snapshots__/backupNg.spec.js.snap

@@ -134,7 +134,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": true,
+    "isBase": true,
     "type": "remote",
   },
   "end": Any<Number>,
@@ -175,7 +175,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": true,
+    "isBase": true,
     "type": "remote",
   },
   "end": Any<Number>,
@@ -241,7 +241,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": false,
+    "isBase": false,
     "type": "remote",
   },
   "end": Any<Number>,
@@ -282,7 +282,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": false,
+    "isBase": false,
     "type": "remote",
   },
   "end": Any<Number>,
@@ -348,7 +348,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": true,
+    "isBase": true,
     "type": "remote",
   },
   "end": Any<Number>,
@@ -389,7 +389,7 @@ exports[`backupNg execute three times a delta backup with 2 remotes, 2 as retent
 Object {
   "data": Object {
     "id": Any<String>,
-    "isFull": true,
+    "isBase": true,
     "type": "remote",
   },
   "end": Any<Number>,

packages/xo-server/src/xo-mixins/backups-ng/index.mjs

@@ -3,7 +3,6 @@ import Disposable from 'promise-toolbox/Disposable'
 import forOwn from 'lodash/forOwn.js'
 import groupBy from 'lodash/groupBy.js'
 import merge from 'lodash/merge.js'
-import { Backup } from '@xen-orchestra/backups/Backup.js'
 import { createLogger } from '@xen-orchestra/log'
 import { createPredicate } from 'value-matcher'
 import { decorateWith } from '@vates/decorate-with'
@@ -18,6 +17,7 @@ import { debounceWithKey, REMOVE_CACHE_ENTRY } from '../../_pDebounceWithKey.mjs
 import { handleBackupLog } from '../../_handleBackupLog.mjs'
 import { serializeError, unboxIdsFromPattern } from '../../utils.mjs'
 import { waitAll } from '../../_waitAll.mjs'
+import { instantiateBackupJob } from '@xen-orchestra/backups/backupJob.js'
 
 const log = createLogger('xo:xo-mixins:backups-ng')
 
@@ -146,6 +146,9 @@ export default class BackupNg {
         const proxyId = job.proxy
         const useXoProxy = proxyId !== undefined
         const remoteIds = unboxIdsFromPattern(job.remotes)
+        if (job.sourceRemote) {
+          remoteIds.push(job.sourceRemote)
+        }
         try {
           if (!useXoProxy && backupsConfig.disableWorkers) {
             const localTaskIds = { __proto__: null }
@@ -164,7 +167,7 @@ export default class BackupNg {
                   }),
               },
               () =>
-                new Backup({
+                instantiateBackupJob({
                   config: backupsConfig,
                   getAdapter: async remoteId =>
                     app.getBackupsRemoteAdapter(await app.getRemoteWithCredentials(remoteId)),

packages/xo-server/src/xo-mixins/metadata-backups.mjs

@@ -1,8 +1,8 @@
 import asyncMapSettled from '@xen-orchestra/async-map/legacy.js'
 import cloneDeep from 'lodash/cloneDeep.js'
 import Disposable from 'promise-toolbox/Disposable'
-import { Backup } from '@xen-orchestra/backups/Backup.js'
 import { createLogger } from '@xen-orchestra/log'
+import { instantiateBackupJob } from '@xen-orchestra/backups/backupJob.js'
 import { parseMetadataBackupId } from '@xen-orchestra/backups/parseMetadataBackupId.js'
 import { RestoreMetadataBackup } from '@xen-orchestra/backups/RestoreMetadataBackup.js'
 import { Task } from '@xen-orchestra/backups/Task.js'
@@ -129,7 +129,7 @@ export default class metadataBackup {
               }),
           },
           () =>
-            new Backup({
+            instantiateBackupJob({
               config: this._app.config.get('backups'),
               getAdapter: async remoteId => app.getBackupsRemoteAdapter(await app.getRemoteWithCredentials(remoteId)),
 

packages/xo-server/src/xo-mixins/migrate-vm.mjs

@@ -1,4 +1,3 @@
-import { Backup } from '@xen-orchestra/backups/Backup.js'
 import { decorateWith } from '@vates/decorate-with'
 import { defer as deferrable } from 'golike-defer'
 import { fromEvent } from 'promise-toolbox'
@@ -10,6 +9,7 @@ import Esxi from '@xen-orchestra/vmware-explorer/esxi.mjs'
 import openDeltaVmdkasVhd from '@xen-orchestra/vmware-explorer/openDeltaVmdkAsVhd.mjs'
 import OTHER_CONFIG_TEMPLATE from '../xapi/other-config-template.mjs'
 import VhdEsxiRaw from '@xen-orchestra/vmware-explorer/VhdEsxiRaw.mjs'
+import { instantiateBackupJob } from '@xen-orchestra/backups/backupJob.js'
 
 export default class MigrateVm {
   constructor(app) {
@@ -41,7 +41,7 @@ export default class MigrateVm {
     const schedule = { id: 'one-time' }
 
     // for now we only support this from the main OA, no proxy
-    return new Backup({
+    return instantiateBackupJob({
       config,
       job,
       schedule,

packages/xo-web/src/xo-app/backup/new/index.js

@@ -268,7 +268,7 @@ const New = decorate([
 
         await createBackupNgJob({
           name: state.name,
-          mode: state.isDelta ? 'delta' : 'full',
+          mode: state.isIncremental ? 'delta' : 'full',
           compression: state.compression,
           proxy: state.proxyId === null ? undefined : state.proxyId,
           schedules,
@@ -335,7 +335,7 @@ const New = decorate([
         await editBackupNgJob({
           id: props.job.id,
           name: state.name,
-          mode: state.isDelta ? 'delta' : 'full',
+          mode: state.isIncremental ? 'delta' : 'full',
           compression: state.compression,
           proxy: state.proxyId,
           settings: normalizeSettings({
@@ -435,10 +435,10 @@ const New = decorate([
       showScheduleModal:
         ({ saveSchedule }, storedSchedule = DEFAULT_SCHEDULE) =>
         async (
-          { copyMode, exportMode, deltaMode, isDelta, propSettings, settings = propSettings, snapshotMode },
+          { copyMode, exportMode, deltaMode, isIncremental, propSettings, settings = propSettings, snapshotMode },
           { intl: { formatMessage } }
         ) => {
-          const modes = { copyMode, isDelta, exportMode, snapshotMode }
+          const modes = { copyMode, isIncremental, exportMode, snapshotMode }
           const schedule = await form({
             defaultValue: storedSchedule,
             render: props => (
@@ -650,7 +650,7 @@ const New = decorate([
         state.missingSnapshotRetention,
       missingName: state => state.name.trim() === '',
       missingVms: state => isEmpty(state.vms) && !state.smartMode,
-      missingBackupMode: state => !state.isDelta && !state.isFull && !state.snapshotMode,
+      missingBackupMode: state => !state.isIncremental && !state.isFull && !state.snapshotMode,
       missingRemotes: state => (state.backupMode || state.deltaMode) && isEmpty(state.remotes),
       missingSrs: state => (state.drMode || state.crMode) && isEmpty(state.srs),
       missingSchedules: (state, { job }) => job !== undefined && isEmpty(state.schedules),
@@ -663,16 +663,16 @@ const New = decorate([
       exportRetentionExists: createDoesRetentionExist('exportRetention'),
       copyRetentionExists: createDoesRetentionExist('copyRetention'),
       snapshotRetentionExists: createDoesRetentionExist('snapshotRetention'),
-      isDelta: state => state.deltaMode || state.crMode,
+      isIncremental: state => state.deltaMode || state.crMode,
       isFull: state => state.backupMode || state.drMode,
       vmsSmartPattern: ({ tags, vmsPattern }) => ({
         ...vmsPattern,
         tags: constructSmartPattern(tags, normalizeTagValues),
       }),
       vmPredicate:
-        ({ isDelta }, { hostsById, poolsById }) =>
+        ({ isIncremental }, { hostsById, poolsById }) =>
         ({ $container }) =>
-          !isDelta ||
+          !isIncremental ||
           canDeltaBackup(
             get(() => hostsById[$container].version) || get(() => hostsById[poolsById[$container].master].version)
           ),
@@ -781,7 +781,7 @@ const New = decorate([
                     <ActionButton
                       active={state.backupMode}
                       data-mode='backupMode'
-                      disabled={state.isDelta}
+                      disabled={state.isIncremental}
                       handler={effects.toggleMode}
                       icon='backup'
                     >
@@ -799,7 +799,7 @@ const New = decorate([
                     <ActionButton
                       active={state.drMode}
                       data-mode='drMode'
-                      disabled={state.isDelta || (!state.drMode && process.env.XOA_PLAN < 3)}
+                      disabled={state.isIncremental || (!state.drMode && process.env.XOA_PLAN < 3)}
                       handler={effects.toggleMode}
                       icon='disaster-recovery'
                     >
@@ -985,7 +985,7 @@ const New = decorate([
                           placeholder={formatMessage(messages.timeoutUnit)}
                         />
                       </FormGroup>
-                      {state.isDelta && (
+                      {state.isIncremental && (
                         <FormGroup>
                           <label htmlFor={state.inputFullIntervalId}>
                             <strong>{_('fullBackupInterval')}</strong>
@@ -1078,7 +1078,7 @@ const New = decorate([
                   </ActionButton>
                 </CardHeader>
                 <CardBlock>
-                  {state.isDelta && (
+                  {state.isIncremental && (
                     <span className='text-muted'>
                       <Icon icon='info' /> {_('deltaBackupOnOutdatedXenServerWarning')}
                     </span>
@@ -1087,7 +1087,7 @@ const New = decorate([
                   {state.smartMode ? (
                     <Upgrade place='newBackup' required={3}>
                       <SmartBackup
-                        deltaMode={state.isDelta}
+                        deltaMode={state.isIncremental}
                         onChange={effects.onVmsPatternChange}
                         pattern={state.vmsPattern}
                       />

packages/xo-web/src/xo-app/backup/new/new-schedule.js

@@ -177,7 +177,7 @@ const New = decorate([
             </div>
           )}
         </FormGroup>
-        {modes.isDelta && (
+        {modes.isIncremental && (
           <FormGroup>
             <label>
               <strong>{_('forceFullBackup')}</strong>{' '}

packages/xo-web/src/xo-app/backup/new/schedules.js

@@ -80,7 +80,7 @@ export default decorate([
           },
         ]
 
-        if (state.isDelta) {
+        if (state.isIncremental) {
           columns.push({
             itemRenderer: schedule => (schedule.fullInterval === 1 ? _('stateEnabled') : _('stateDisabled')),
             sortCriteria: 'fullInterval',

packages/xo-web/src/xo-app/logs/backup-ng/log-alert-body.js

@@ -252,7 +252,8 @@ const VmTask = ({ children, className, restartVmJob, task }) => (
         {_.keyValue(_('taskMergedDataSpeed'), formatSpeed(task.merge.size, task.merge.duration))}
       </div>
     )}
-    {task.isFull !== undefined && _.keyValue(_('exportType'), task.isFull ? 'full' : 'delta')}
+    {(task.isBase !== undefined || task.isFull !== undefined) &&
+      _.keyValue(_('exportType'), task.isBase || task.isFull /* legacy */ ? 'base' : 'delta')}
   </li>
 )
 
@@ -501,8 +502,10 @@ export default decorate([
               : 'xo'
 
           if (task.tasks !== undefined) {
-            const subTaskWithIsFull = task.tasks.find(({ data = {} }) => data.isFull !== undefined)
+            const subTaskWithIsBase = task.tasks.find(
-            task.isFull = get(() => subTaskWithIsFull.data.isFull)
+              ({ data = {} }) => data.isBase !== undefined || data.isFUll !== undefined
+            )
+            task.isBase = get(() => subTaskWithIsBase.data.isFull || subTaskWithIsBase.data.isBase)
           }
         })