image-layout: a MUST and some schema

Signed-off-by: Vincent Batts <[email protected]>

Author: vbatts

schema/fs.go

@@ -286,6 +286,19 @@ MrVJbn8cB+ZnN/gbAAD//0JyEpx5DAAA
 `,
 	},
 
+	"/image-layout-schema.json": {
+		local:   "image-layout-schema.json",
+		size:    414,
+		modtime: 1478197703,
+		compressed: `
+H4sIAAAJbogA/2yPwUrEMBCG732KIXq0TQVPue5pQdiD4EU8xHa2zWKTOJkKi/TdJZlWD91TmD/z8c3/
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+ngEAAA==
+`,
+	},
+
 	"/image-manifest-schema.json": {
 		local:   "image-manifest-schema.json",
 		size:    1118,

schema/image-layout-schema.json

@@ -0,0 +1,18 @@
+{
+  "description": "OpenContainer Image Layout Schema",
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "id": "https://opencontainers.org/schema/image-layout",
+  "type": "object",
+  "properties": {
+    "imageLayoutVersion": {
+      "description": "version of the OCI image-layout",
+      "type": "string",
+      "enum": [
+        "1.0.0"
+      ]
+    }
+  },
+  "required": [
+    "imageLayoutVersion"
+  ]
+}