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do not require gs bucket permissions to init repository

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a gs service account may only have object permissions on an existing
bucket but no bucket create/get permissions.

these service accounts currently are blocked from initialization a
restic repository because restic can not determine if the bucket exists.

this PR updates the logic to assume the bucket exists when the bucket
attribute request results in a permissions denied error.

this way, restic can still initialize a repository if the service
account does have object permissions

fixes: https://github.com/restic/restic/issues/3100
This commit is contained in:
eleith 2020-11-17 16:44:26 -08:00
parent 5f3b802ee7
commit a24e986b2b
2 changed files with 15 additions and 0 deletions
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10
changelog/unreleased/issue-3100 Normal file
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@ -0,0 +1,10 @@
Bugfix: Do not require gs bucket permissions when running init
Restic used to require bucket level permissions for the gs backend
in order to initialize a restic repository.
It now allows a gs service account to initialize a repository if the
bucket does exist and the service account has permissions to write/read
to that bucket.
https://github.com/restic/restic/issues/3100

5
internal/backend/gs/gs.go
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@ -136,6 +136,11 @@ func Create(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
ctx := context.Background()
exists, err := be.bucketExists(ctx, be.bucket)
if err != nil {
if e, ok := err.(*googleapi.Error); ok && e.Code == http.StatusForbidden {
// the bucket might exist!
// however, the client doesn't have storage.bucket.get permission
return be, nil
}
return nil, errors.Wrap(err, "service.Buckets.Get")
}