Extend MergeToRefService for creating merge ref from the other ref

Currently, MergeToRefService is specifically designed for
createing merge commits from source branch and target branch of
merge reqeusts. We extend this behavior to source branch and any
target ref paths.

2 files changed, 5 insertions, 4 deletions

diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 19b6aab1c4f..060a29be782 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -536,9 +536,9 @@ module Gitlab
         tags.find { |tag| tag.name == name }
       end
 
-      def merge_to_ref(user, source_sha, branch, target_ref, message)
+      def merge_to_ref(user, source_sha, branch, target_ref, message, first_parent_ref)
         wrapped_gitaly_errors do
-          gitaly_operation_client.user_merge_to_ref(user, source_sha, branch, target_ref, message)
+          gitaly_operation_client.user_merge_to_ref(user, source_sha, branch, target_ref, message, first_parent_ref)
         end
       end
 
diff --git a/lib/gitlab/gitaly_client/operation_service.rb b/lib/gitlab/gitaly_client/operation_service.rb
index b42e6cbad8d..783c2ff0915 100644
--- a/lib/gitlab/gitaly_client/operation_service.rb
+++ b/lib/gitlab/gitaly_client/operation_service.rb
@@ -100,14 +100,15 @@ module Gitlab
         end
       end
 
-      def user_merge_to_ref(user, source_sha, branch, target_ref, message)
+      def user_merge_to_ref(user, source_sha, branch, target_ref, message, first_parent_ref)
         request = Gitaly::UserMergeToRefRequest.new(
           repository: @gitaly_repo,
           source_sha: source_sha,
           branch: encode_binary(branch),
           target_ref: encode_binary(target_ref),
           user: Gitlab::Git::User.from_gitlab(user).to_gitaly,
-          message: encode_binary(message)
+          message: encode_binary(message),
+          first_parent_ref: encode_binary(first_parent_ref)
         )
 
         response = GitalyClient.call(@repository.storage, :operation_service, :user_merge_to_ref, request)