change default mappers behavior to failsafe (to filestore or nil)

internal/getter/directory.go

@@ -33,7 +33,7 @@ func (d directory) Open(ctx context.Context, u *url.URL) (io.ReadCloser, error)
 	defer zw.Close()
 
 	tarDigester := digest.Canonical.Digester()
-	if err := tarDir(d.path(u), d.Name(u), io.MultiWriter(zw, tarDigester.Hash()), true); err != nil {
+	if err := tarDir(d.path(u), d.Name(u), io.MultiWriter(zw, tarDigester.Hash()), false); err != nil {
 		return nil, err
 	}
 

internal/mapper/mappers.go

@@ -13,23 +13,23 @@ type Fn func(desc ocispec.Descriptor) (string, error)
 
 // FromManifest will return the appropriate content store given a reference and source type adequate for storing the results on disk
 func FromManifest(manifest ocispec.Manifest, root string) (target.Target, error) {
+	// TODO: Don't rely solely on config mediatype
 	switch manifest.Config.MediaType {
 	case consts.DockerConfigJSON, consts.OCIManifestSchema1:
 		s := NewMapperFileStore(root, Images())
 		defer s.Close()
 		return s, nil
 
-	case consts.FileLocalConfigMediaType:
-		s := NewMapperFileStore(root, nil)
-		defer s.Close()
-		return s, nil
-
 	case consts.ChartLayerMediaType, consts.ChartConfigMediaType:
 		s := NewMapperFileStore(root, Chart())
 		defer s.Close()
 		return s, nil
+
+	default:
+		s := NewMapperFileStore(root, nil)
+		defer s.Close()
+		return s, nil
 	}
-	return nil, fmt.Errorf("could not identify mapper from manifest with media type [%s]", manifest.MediaType)
 }
 
 func Images() map[string]Fn {