Vendor after merging mtrmac/image:ParseNormalizedNamed

… and use the master branch of docker/distribution which provides
docker/distribution/reference.ParseNormalizedNamed.

vendor/github.com/docker/distribution/manifests.go

@@ -5,20 +5,25 @@ import (
 	"mime"
 
 	"github.com/docker/distribution/context"
-	"github.com/docker/distribution/digest"
+	"github.com/opencontainers/go-digest"
 )
 
 // Manifest represents a registry object specifying a set of
 // references and an optional target
 type Manifest interface {
 	// References returns a list of objects which make up this manifest.
-	// The references are strictly ordered from base to head. A reference
-	// is anything which can be represented by a distribution.Descriptor
+	// A reference is anything which can be represented by a
+	// distribution.Descriptor. These can consist of layers, resources or other
+	// manifests.
+	//
+	// While no particular order is required, implementations should return
+	// them from highest to lowest priority. For example, one might want to
+	// return the base layer before the top layer.
 	References() []Descriptor
 
 	// Payload provides the serialized format of the manifest, in addition to
-	// the mediatype.
-	Payload() (mediatype string, payload []byte, err error)
+	// the media type.
+	Payload() (mediaType string, payload []byte, err error)
 }
 
 // ManifestBuilder creates a manifest allowing one to include dependencies.
@@ -36,6 +41,9 @@ type ManifestBuilder interface {
 	// AppendReference includes the given object in the manifest after any
 	// existing dependencies. If the add fails, such as when adding an
 	// unsupported dependency, an error may be returned.
+	//
+	// The destination of the reference is dependent on the manifest type and
+	// the dependency type.
 	AppendReference(dependency Describable) error
 }
 
@@ -86,20 +94,20 @@ var mappings = make(map[string]UnmarshalFunc, 0)
 func UnmarshalManifest(ctHeader string, p []byte) (Manifest, Descriptor, error) {
 	// Need to look up by the actual media type, not the raw contents of
 	// the header. Strip semicolons and anything following them.
-	var mediatype string
+	var mediaType string
 	if ctHeader != "" {
 		var err error
-		mediatype, _, err = mime.ParseMediaType(ctHeader)
+		mediaType, _, err = mime.ParseMediaType(ctHeader)
 		if err != nil {
 			return nil, Descriptor{}, err
 		}
 	}
 
-	unmarshalFunc, ok := mappings[mediatype]
+	unmarshalFunc, ok := mappings[mediaType]
 	if !ok {
 		unmarshalFunc, ok = mappings[""]
 		if !ok {
-			return nil, Descriptor{}, fmt.Errorf("unsupported manifest mediatype and no default available: %s", mediatype)
+			return nil, Descriptor{}, fmt.Errorf("unsupported manifest media type and no default available: %s", mediaType)
 		}
 	}
 
@@ -108,10 +116,10 @@ func UnmarshalManifest(ctHeader string, p []byte) (Manifest, Descriptor, error)
 
 // RegisterManifestSchema registers an UnmarshalFunc for a given schema type.  This
 // should be called from specific
-func RegisterManifestSchema(mediatype string, u UnmarshalFunc) error {
-	if _, ok := mappings[mediatype]; ok {
-		return fmt.Errorf("manifest mediatype registration would overwrite existing: %s", mediatype)
+func RegisterManifestSchema(mediaType string, u UnmarshalFunc) error {
+	if _, ok := mappings[mediaType]; ok {
+		return fmt.Errorf("manifest media type registration would overwrite existing: %s", mediaType)
 	}
-	mappings[mediatype] = u
+	mappings[mediaType] = u
 	return nil
 }