/
service_v2.go
110 lines (101 loc) · 2.94 KB
/
service_v2.go
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package graph
import (
"fmt"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/docker/api/types"
"github.com/docker/docker/graph/tags"
"github.com/docker/docker/image"
"github.com/docker/docker/registry"
"github.com/docker/docker/utils"
"golang.org/x/net/context"
)
type v2ManifestFetcher struct {
*TagStore
endpoint registry.APIEndpoint
config *LookupRemoteConfig
repoInfo *registry.RepositoryInfo
repo distribution.Repository
}
func (p *v2ManifestFetcher) Fetch(ref string) (imgInspect *types.RemoteImageInspect, fallback bool, err error) {
p.repo, err = NewV2Repository(p.repoInfo, p.endpoint, p.config.MetaHeaders, p.config.AuthConfig)
if err != nil {
logrus.Debugf("Error getting v2 registry: %v", err)
return nil, true, err
}
imgInspect, err = p.fetchWithRepository(ref)
if err != nil && registry.ContinueOnError(err) {
logrus.Debugf("Error trying v2 registry: %v", err)
fallback = true
}
return
}
func (p *v2ManifestFetcher) fetchWithRepository(ref string) (*types.RemoteImageInspect, error) {
var (
exists bool
dgst digest.Digest
err error
img *image.Image
signedManifest *manifest.SignedManifest
tag string
)
manSvc, err := p.repo.Manifests(context.Background())
if err != nil {
return nil, err
}
if utils.DigestReference(ref) {
dgst, err = digest.ParseDigest(ref)
if err != nil {
return nil, fmt.Errorf("Invalid digest string %q: %v ", ref, err)
}
exists, err = manSvc.Exists(dgst)
if err == nil && !exists {
return nil, fmt.Errorf("Digest %q does not exist in remote repository %s", p.repoInfo.CanonicalName, p.repoInfo.CanonicalName)
}
if exists {
signedManifest, err = manSvc.Get(dgst)
}
} else {
if ref == "" {
tagList, err := manSvc.Tags()
if err != nil {
return nil, err
}
for _, t := range tagList {
if t == tags.DEFAULTTAG {
ref = tags.DEFAULTTAG
}
}
if ref == "" && len(tagList) > 0 {
ref = tagList[0]
}
if ref == "" {
return nil, fmt.Errorf("No tags available for remote repository %s", p.repoInfo.CanonicalName)
}
} else {
exists, err = manSvc.ExistsByTag(ref)
if err != nil {
return nil, err
}
if err == nil && !exists {
return nil, fmt.Errorf("Tag %q does not exist in remote repository %s", ref, p.repoInfo.CanonicalName)
}
}
tag = ref
signedManifest, err = manSvc.GetByTag(ref)
if err == nil {
dgst, _, err = digestFromManifest(signedManifest, p.repoInfo.LocalName)
}
}
if err != nil {
return nil, err
}
if len(signedManifest.Manifest.FSLayers) < 1 || len(signedManifest.Manifest.History) < 1 {
return nil, fmt.Errorf("No layer in obtained manifest!")
}
imgJSON := []byte(signedManifest.Manifest.History[0].V1Compatibility)
img, err = image.NewImgJSON(imgJSON)
return makeRemoteImageInspect(p.repoInfo, img, tag, dgst), nil
}