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Prefer digest over tag on pull 

If a reference passed to the pull code contains both a tag and a digest,
currently the tag is used instead of the digest in the request to the
registry. This is the wrong behavior. Change it to favor the digest.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2017-05-15 17:17:27 -07:00
parent 7535462b77
commit 0bff591bb0
1 changed files with 7 additions and 7 deletions
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14
distribution/pull_v2.go
View File

@ -334,18 +334,18 @@ func (p *v2Puller) pullV2Tag(ctx context.Context, ref reference.Named) (tagUpdat
manifest distribution.Manifest
tagOrDigest string // Used for logging/progress only
)
if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
manifest, err = manSvc.Get(ctx, "", distribution.WithTag(tagged.Tag()))
if err != nil {
return false, allowV1Fallback(err)
}
tagOrDigest = tagged.Tag()
} else if digested, isDigested := ref.(reference.Canonical); isDigested {
if digested, isDigested := ref.(reference.Canonical); isDigested {
manifest, err = manSvc.Get(ctx, digested.Digest())
if err != nil {
return false, err
}
tagOrDigest = digested.Digest().String()
} else if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
manifest, err = manSvc.Get(ctx, "", distribution.WithTag(tagged.Tag()))
if err != nil {
return false, allowV1Fallback(err)
}
tagOrDigest = tagged.Tag()
} else {
return false, fmt.Errorf("internal error: reference has neither a tag nor a digest: %s", reference.FamiliarString(ref))
}