Update the content interface to return info from update

Namespace keys used by client for uncompressed

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

api/services/content/v1/content.proto

@@ -22,7 +22,7 @@ service Content {
 	// This call can be used to manage the mutable content labels. The
 	// immutable metadata such as digest, size, and committed at cannot
 	// be updated.
-	rpc Update(UpdateRequest) returns (google.protobuf.Empty);
+	rpc Update(UpdateRequest) returns (UpdateResponse);
 
 	// List streams the entire set of content as Info objects and closes the
 	// stream.
@@ -111,6 +111,10 @@ message UpdateRequest {
 	google.protobuf.FieldMask update_mask = 2;
 }
 
+message UpdateResponse {
+	Info info = 1 [(gogoproto.nullable) = false];
+}
+
 message ListContentRequest {
 	// Filters contains one or more filters using the syntax defined in the
 	// containerd filter package.