add compatibility mediatype

specs-go/compatibility/mediatype.go

@@ -0,0 +1,29 @@
+// Copyright 2016 The Linux Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package compatibility
+
+const (
+	// MediaTypeDockerImageManifestList specifies the docker image's mediaType for manifest lists.
+	MediaTypeDockerImageManifestList = "application/vnd.docker.distribution.manifest.list.v2+json"
+
+	// MediaTypeDockerImageManifest specifies the docker image's mediaType for the current version.
+	MediaTypeDockerImageManifest = "application/vnd.docker.distribution.manifest.v2+json"
+
+	// MediaTypeDockerImageLayer specifies the docker image's mediaType used for layers referenced by the manifest.
+	MediaTypeDockerImageLayer = "application/vnd.docker.image.rootfs.diff.tar.gzip"
+
+	// MediaTypeDockerImageConfig specifies the docker image's mediaType for the image configuration.
+	MediaTypeDockerImageConfig = "application/vnd.docker.container.image.v1+json"
+)