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Adding function to resolve tag to digest in daemon

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Signed-off-by: Nishant Totla <nishanttotla@gmail.com>
This commit is contained in:
Nishant Totla 2016-11-07 23:59:55 -08:00
parent 16ea0806f8
commit 87075353dc
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GPG key ID: 7EA5781C9B3D0C19
2 changed files with 40 additions and 0 deletions
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2
daemon/cluster/executor/backend.go
View file

@ -10,6 +10,7 @@ import (
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/network"
clustertypes "github.com/docker/docker/daemon/cluster/provider"
"github.com/docker/docker/reference"
"github.com/docker/libnetwork"
"github.com/docker/libnetwork/cluster"
networktypes "github.com/docker/libnetwork/types"
@ -44,4 +45,5 @@ type Backend interface {
UnsubscribeFromEvents(listener chan interface{})
UpdateAttachment(string, string, string, *network.NetworkingConfig) error
WaitForDetachment(context.Context, string, string, string, string) error
ResolveTagToDigest(context.Context, reference.NamedTagged, *types.AuthConfig) (string, error)
}

38
daemon/image_pull.go
View file

@ -104,3 +104,41 @@ func (daemon *Daemon) pullImageWithReference(ctx context.Context, ref reference.
<-writesDone
return err
}
func (daemon *Daemon) ResolveTagToDigest(ctx context.Context, ref reference.NamedTagged, authConfig *types.AuthConfig) (string, error) {
// get repository info
repoInfo, err := daemon.RegistryService.ResolveRepository(ref)
if err != nil {
return "", err
}
// makes sure name is not empty or `scratch`
if err := distribution.ValidateRepoName(repoInfo.Name()); err != nil {
return "", err
}
// get endpoints
endpoints, err := daemon.RegistryService.LookupPullEndpoints(repoInfo.Hostname())
if err != nil {
return "", err
}
// retrieve repository
// TODO(nishanttotla): More sophisticated selection of endpoint
repo, confirmedV2, err := distribution.NewV2Repository(ctx, repoInfo, endpoints[0], nil, authConfig, "pull")
if err != nil {
return "", err
}
digest := ""
// only retrieve digest if the repo is v2
if confirmedV2 {
dscrptr, err := repo.Tags(ctx).Get(ctx, ref.Tag())
if err != nil {
return "", err
} else {
digest = dscrptr.Digest.String()
}
}
return digest, nil
}