fix(backups): mirror must not replicate themselves (#7043)

Fixes zammad#16871

@xen-orchestra/backups/_runners/_vmRunners/_AbstractRemote.mjs

@@ -4,6 +4,7 @@ import { Disposable } from 'promise-toolbox'
 import { getVmBackupDir } from '../../_getVmBackupDir.mjs'
 
 import { Abstract } from './_Abstract.mjs'
+import { extractIdsFromSimplePattern } from '../../extractIdsFromSimplePattern.mjs'
 
 export const AbstractRemote = class AbstractRemoteVmBackupRunner extends Abstract {
   constructor({
@@ -34,7 +35,8 @@ export const AbstractRemote = class AbstractRemoteVmBackupRunner extends Abstrac
     this._writers = writers
 
     const RemoteWriter = this._getRemoteWriter()
-    Object.entries(remoteAdapters).forEach(([remoteId, adapter]) => {
+    extractIdsFromSimplePattern(job.remotes).forEach(remoteId => {
+      const adapter = remoteAdapters[remoteId]
       const targetSettings = {
         ...settings,
         ...allSettings[remoteId],

CHANGELOG.unreleased.md

@@ -18,6 +18,7 @@
 - [Jobs] Fix schedules not being displayed on first load [#6968](https://github.com/vatesfr/xen-orchestra/issues/6968) (PR [#7034](https://github.com/vatesfr/xen-orchestra/pull/7034))
 - [OVA Export] Fix support of disks with more than 8.2GiB of content (PR [#7047](https://github.com/vatesfr/xen-orchestra/pull/7047))
 - [Backup] Fix `VHDFile implementation is not compatible with encrypted remote` when using VHD directory with encryption (PR [#7045](https://github.com/vatesfr/xen-orchestra/pull/7045))
+- [Backup/Mirror] Fix `xo:fs:local WARN lock compromised` when mirroring a Backup Repository to a local/NFS/SMB repository ([#7043](https://github.com/vatesfr/xen-orchestra/pull/7043))
 
 ### Packages to release
 
@@ -35,6 +36,7 @@
 
 <!--packages-start-->
 
+- @xen-orchestra/backups patch
 - vhd-lib minor
 - xo-server patch
 - xo-server-auth-github patch

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

@@ -148,10 +148,7 @@ export default class BackupNg {
 
         const proxyId = job.proxy
         const useXoProxy = proxyId !== undefined
-        const remoteIds = unboxIdsFromPattern(job.remotes)
-        if (job.sourceRemote !== undefined) {
-          remoteIds.push(job.sourceRemote)
-        }
+        const targetRemoteIds = unboxIdsFromPattern(job.remotes)
         try {
           if (!useXoProxy && backupsConfig.disableWorkers) {
             const localTaskIds = { __proto__: null }
@@ -207,7 +204,11 @@ export default class BackupNg {
           const xapis = {}
           const remoteErrors = {}
           await waitAll([
-            asyncMapSettled(remoteIds, async id => {
+            asyncMapSettled([...targetRemoteIds, job.sourceRemote], async id => {
+              if (id === undefined) {
+                // job.sourceRemote is only defined in mirror backups
+                return
+              }
               let remote
               try {
                 remote = await app.getRemoteWithCredentials(id)
@@ -249,20 +250,29 @@ export default class BackupNg {
             }),
           ])
 
-          // Fails the job if all remotes are disabled
+          // update remotes list with only the enabled remotes
+          // only keep the destination remote in case of a mirror backup
+          const enabledTargetRemotes = Object.keys(remotes).filter(remoteId => remoteId !== job.sourceRemote)
+
+          // Fails the job if all the target remotes are disabled
           //
           // TODO: integrate each failure in its own tasks and still proceed
           // with other tasks like rolling snapshot and replication.
-          if (remoteIds.length > 0 && Object.keys(remotes).length === 0) {
+          if (targetRemoteIds.length > 0 && enabledTargetRemotes.length === 0) {
             const error = new Error(`couldn't instantiate any remote`)
             error.errors = remoteErrors
             throw error
           }
 
-          // update remotes list with only the enabled remotes
+          if (job.sourceRemote !== undefined && remotes[job.sourceRemote] === undefined) {
+            const error = new Error(`couldn't instantiate source remote`)
+            error.errors = remoteErrors
+            throw error
+          }
+
           job.remotes = {
             id: {
-              __or: Object.keys(remotes),
+              __or: enabledTargetRemotes,
             },
           }
 
@@ -332,7 +342,7 @@ export default class BackupNg {
             )
           }
         } finally {
-          remoteIds.forEach(id => this._listVmBackupsOnRemote(REMOVE_CACHE_ENTRY, id))
+          targetRemoteIds.forEach(id => this._listVmBackupsOnRemote(REMOVE_CACHE_ENTRY, id))
         }
       }
       app.registerJobExecutor('backup', executor)