2 Commits

Author	SHA1	Message	Date
dillard	6cbc5d79d4	Phase 2: per-user backup and restore via user_migration ... Wires the existing RepositoryExportDestination/RepositoryImportSource (see lib/UserMigration/) into user_migration's own UserMigrationService, resolved on demand through a new UserMigrationServiceLocator since the app is an optional dependency (PLAN.md 3.8) -- without it, only this feature is unavailable, the full backup still works. New: UserBackupService::backupUser() (occ backup:backup:user) streams a user_migration export straight into the repository, under the same shared location lock as a regular backup. UserRestoreService::restoreUser() (occ backup:restore:user) never imports over a live account: --mode=replace safety-exports the current state first, then deletes and recreates the account from the backup under the same uid; --mode=as-backup restores into a new "<uid>-bak" account instead, since Nextcloud cannot rename a uid. The catalog now also tracks user export manifests (Repository::recordUserExport/ listUserExports/forgetUserExport/isRecordedUserExport), rollback-protected like a snapshot: listUserExports() verifies each one is still present on the location, and restore only ever reads a manifest the verified catalog actually recorded, never an arbitrary caller-supplied path. prune()'s existing raw users/ scan for blob retention is unchanged. A new short exclusive "catalog" lock (PruneService::catalogLockKey()) serializes the catalog write itself, so two concurrent per-user backups (or one alongside a full backup) can no longer race to write the same next generation and silently drop one of them -- the broader per-target shared lock only ever protected against a concurrent cleanup, not against other shared holders. Two real bugs found by testing this against a live Nextcloud instance, not by unit tests (RepositoryExportDestination/RepositoryImportSource implement OCP interfaces that plain PHPUnit can't load, see tests/Unit/Repository/UserExportTest.php's docblock; the new tests/integration/user-roundtrip.sh covers the real round trip instead): - RepositoryImportSource::copyToFolder() double-closed the stream it handed to putContent()/newFile() (both already close it themselves), which throws a TypeError on PHP 8 and broke every restored file with content. - A replace-mode restore failed on NotPermittedException: IRootFolder::getUserFolder() caches a Folder per uid for the process lifetime, so after delete+recreate of the same uid the import still got the deleted account's (now storage-less) folder. Fixed by dispatching FilesystemTornDownEvent, which Root already listens for to clear exactly that cache -- no internal OC\ classes needed. Local review (CodeRabbit + Codex) against this diff found three more real issues, all fixed: the catalog write race above, a failed as-backup import leaving a broken stub account behind (now deleted on failure), and an export stream leak on a read/backend failure in RepositoryExportDestination::copyFolder() (now closed in a finally). Deliberately left out: wiring per-user export into the automatic backup schedule (on-demand via occ only, for now) and retention/pruning of old user exports -- both open design questions, not yet decided. The lease covering a single export/import still has a fixed TTL (3600s) with no mid-call refresh, since UserMigrationService exposes no progress; a resumable, step-based per-user backup (like the main BackupService run) would remove that cap but is a bigger change than this pass.	2026-10-05 17:36:46 +02:00
dillard	f75ed3aed6	M5: chained catalog against rollback and hidden snapshots ... Every change to the set of snapshots or trash entries writes an encrypted catalog generation bound to the repository and its position, with the hash of the previous generation. The server anchors the newest generation it has seen in its app config; on open, the location must show at least that generation and chain back to it, and every snapshot listed must exist. A rolled-back or tampered location is refused (the run fails and administrators are notified). Opening with the passphrase on a new server accepts the newest valid chain. occ backup:target:trust-current accepts a legitimately older state (e.g. restored from the provider's snapshot) after typing the location name; audited and announced to all administrators. Tests: chain advances, rollback, hidden snapshot, swapped generation, disaster recovery without anchor. Tested on NC34 by deleting the newest catalog generation on the SFTP location.	2026-10-02 11:30:42 +02:00