pkg/dockerregistry/server/manifesthandler: add manifest list handler

pkg/dockerregistry/server/manifesthandler/manifesthandler.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 
 	"github.com/docker/distribution"
-	_ "github.com/docker/distribution/manifest/manifestlist"
+	"github.com/docker/distribution/manifest/manifestlist"
 	"github.com/docker/distribution/manifest/ocischema"
 	"github.com/docker/distribution/manifest/schema1"
 	"github.com/docker/distribution/manifest/schema2"
@@ -46,6 +46,8 @@ func NewManifestHandler(serverAddr string, blobStore distribution.BlobStore, man
 		return &manifestSchema2Handler{blobStore: blobStore, manifest: t}, nil
 	case *ocischema.DeserializedManifest:
 		return &manifestOCIHandler{blobStore: blobStore, manifest: t}, nil
+	case *manifestlist.DeserializedManifestList:
+		return &manifestListHandler{manifest: t}, nil
 	default:
 		return nil, fmt.Errorf("unsupported manifest type %T", manifest)
 	}

pkg/dockerregistry/server/manifesthandler/manifestlisthandler.go

@@ -0,0 +1,47 @@
+package manifesthandler
+
+import (
+	"context"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/manifest/manifestlist"
+	"github.com/opencontainers/go-digest"
+	imageapiv1 "github.com/openshift/api/image/v1"
+)
+
+type manifestListHandler struct {
+	manifest *manifestlist.DeserializedManifestList
+}
+
+var _ ManifestHandler = &manifestListHandler{}
+
+func (h *manifestListHandler) Config(ctx context.Context) ([]byte, error) {
+	return nil, nil
+}
+
+func (h *manifestListHandler) Manifest() distribution.Manifest {
+	return h.manifest
+}
+
+func (h *manifestListHandler) Layers(ctx context.Context) (string, []imageapiv1.ImageLayer, error) {
+	return "", nil, nil
+}
+
+func (h *manifestListHandler) Digest() (digest.Digest, error) {
+	_, p, err := h.manifest.Payload()
+	if err != nil {
+		return "", err
+	}
+	return digest.FromBytes(p), nil
+}
+
+func (h *manifestListHandler) Payload() (mediaType string, payload []byte, canonical []byte, err error) {
+	mt, p, err := h.manifest.Payload()
+	return mt, p, p, err
+}
+
+func (h *manifestListHandler) Verify(ctx context.Context, skipDependencyVerification bool) error {
+	// we could verify that the sub-manifests exist, but that would get on the way
+	// of supporting sparse manifest lists in the future so we verify nothing.
+	return nil
+}