renamed ContentType to MediaType

Author: triarius

Diff for: distribution/manifest.go

@@ -368,8 +368,8 @@ func pbkdf2Aes256GcmEncrypt(
 	err error,
 ) {
 	// make the config
-	var dec *crypto.DeCrypto
-	dec, err = crypto.NewDecrypto(opts)
+	//var dec *crypto.DeCrypto
+	dec, err := crypto.NewDecrypto(opts)
 	if err != nil {
 		return
 	}

Diff for: distribution/manifest_test.go

@@ -100,7 +100,7 @@ func TestImageMock(t *testing.T) {
 			mockLayer,
 			*opts,
 			passphrase,
-			"",
+			fmt.Sprintf("layer is of wrong type: %T", new(mockBlob)),
 			fmt.Sprintf("config is of wrong type: %T", manifest.Config),
 			fmt.Sprintf("layer is of wrong type: %T", new(mockBlob)),
 		},