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pull: use tag service for pulling tagged reference 

The tag service does a `HEAD` request to get the manifest digest, where
we can then do a `GET` against the digest.

The `GET` by tag is not cacheable, but the `GET` against the digest is.
This allows proxies to work way better.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2020-10-30 01:52:23 +00:00
parent bb23f1bf61
commit e4cf1c7336
1 changed files with 7 additions and 1 deletions
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8
distribution/pull_v2.go
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@ -346,10 +346,16 @@ func (p *v2Puller) pullV2Tag(ctx context.Context, ref reference.Named, platform
}
tagOrDigest = digested.Digest().String()
} else if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
manifest, err = manSvc.Get(ctx, "", distribution.WithTag(tagged.Tag()))
tagService := p.repo.Tags(ctx)
desc, err := tagService.Get(ctx, tagged.Tag())
if err != nil {
return false, allowV1Fallback(err)
}
manifest, err = manSvc.Get(ctx, desc.Digest)
if err != nil {
return false, err
}
tagOrDigest = tagged.Tag()
} else {
return false, fmt.Errorf("internal error: reference has neither a tag nor a digest: %s", reference.FamiliarString(ref))