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prune/rebuild-index: Fail if an old index cannot be removed 

The old behavior was problematic in the context of rebuild-index as it
could leave old, possibly invalid index files behind without returning a
fatal error.

Prune calls rebuildIndex before removing any data from the repository.
For this use case failing to delete an old index MUST be treated as a
fatal error. Otherwise the index could still contain an old index file
that refers to blobs/packs that were later on deleted by prune. Later
backup runs will assume that the affected blobs already exist in the
repository which results in a backup which misses data.
This commit is contained in:
Michael Eischer 2020-03-31 14:42:45 +02:00
parent 3ba19869be
commit 744a15247d
1 changed files with 4 additions and 1 deletions
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5
cmd/restic/cmd_rebuild_index.go
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@ -92,7 +92,10 @@ func rebuildIndex(ctx context.Context, repo restic.Repository, ignorePacks resti
Verbosef("saved new indexes as %v\n", ids)
Verbosef("remove %d old index files\n", len(supersedes))
DeleteFiles(globalOptions, repo, restic.NewIDSet(supersedes...), restic.IndexFile)
err = DeleteFilesChecked(globalOptions, repo, restic.NewIDSet(supersedes...), restic.IndexFile)
if err != nil {
return errors.Fatalf("unable to remove an old index: %v\n", err)
}
return nil
}