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gs: Don't drop error when finishing upload

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The error returned when finishing the upload of an object was dropped.
This could cause silent upload failures and thus data loss in certain
cases. When a MD5 hash for the uploaded blob is specified, a wrong
hash/damaged upload would return its error via the Close() whose error
was dropped.
This commit is contained in:
Michael Eischer 2021-01-30 00:39:32 +01:00
parent 4d576c2f79
commit 8a486eafed
2 changed files with 11 additions and 1 deletions
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7
changelog/unreleased/pull-3249 Normal file
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@ -0,0 +1,7 @@
Bugfix: Better error handling for gs backend
The gs backend did not notice when the last steep of completing a file upload
failed. Under rare circumstance, this might be able to cause missing files in
the backup repository. This has been fixed.
https://github.com/restic/restic/pull/3249

5
internal/backend/gs/gs.go
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@ -235,7 +235,10 @@ func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindRe
w := be.bucket.Object(objName).NewWriter(ctx)
w.ChunkSize = 0
wbytes, err := io.Copy(w, rd)
w.Close()
cerr := w.Close()
if err == nil {
err = cerr
}
be.sem.ReleaseToken()