fixes to make layersPathSpec work

Signed-off-by: Guillaume Rose <guillaume.rose@docker.com>

registry/storage/paths.go

@@ -208,7 +208,7 @@ func pathFor(spec pathSpec) (string, error) {
 
 		return path.Join(path.Join(append(blobLinkPathComponents, components...)...), "link"), nil
 	case layersPathSpec:
-		return append(repoPrefix, v.repo, "_layers")
+		return path.Join(append(repoPrefix, v.name, "_layers")...), nil
 	case blobsPathSpec:
 		blobsPathPrefix := append(rootPrefix, "blobs")
 		return path.Join(blobsPathPrefix...), nil
@@ -340,7 +340,7 @@ func (manifestTagIndexEntryLinkPathSpec) pathSpec() {}
 
 // layersPathSpec contains the path for the layers inside a repo
 type layersPathSpec struct {
-	repo string
+	name string
 }
 
 func (layersPathSpec) pathSpec() {}

registry/storage/registry.go

@@ -330,7 +330,7 @@ func (repo *repository) Blobs(ctx context.Context) distribution.BlobStore {
 		// TODO(stevvooe): linkPath limits this blob store to only layers.
 		// This instance cannot be used for manifest checks.
 		linkPathFns:            []linkPathFunc{blobLinkPath},
-		linkDirectoryPathSpec:  layersPathSpec,
+		linkDirectoryPathSpec:  layersPathSpec{name: repo.name.Name()},
 		deleteEnabled:          repo.registry.deleteEnabled,
 		resumableDigestEnabled: repo.resumableDigestEnabled,
 	}