Allow getting the merge base of multiple revisions

As we now support getting the merge base for multiple revisions in
gitaly, we can provide this functionality in our API

2 files changed, 4 insertions, 9 deletions

diff --git a/lib/api/repositories.rb b/lib/api/repositories.rb
index 5125f302fbb..dc844c0bd27 100644
--- a/lib/api/repositories.rb
+++ b/lib/api/repositories.rb
@@ -130,18 +130,13 @@ module API
         success Entities::Commit
       end
       params do
-        # For now we just support 2 refs passed, but `merge-base` supports
-        # multiple defining this as an Array instead of 2 separate params will
-        # make sure we don't need to deprecate this API in favor of one
-        # supporting multiple commits when this functionality gets added to
-        # Gitaly
         requires :refs, type: Array[String]
       end
       get ':id/repository/merge_base' do
         refs = params[:refs]
 
-        unless refs.size == 2
-          render_api_error!('Provide exactly 2 refs', 400)
+        if refs.size < 2
+          render_api_error!('Provide at least 2 refs', 400)
         end
 
         merge_base = Gitlab::Git::MergeBase.new(user_project.repository, refs)
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 4218e812146..9df04372cc2 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -382,9 +382,9 @@ module Gitlab
       end
 
       # Returns the SHA of the most recent common ancestor of +from+ and +to+
-      def merge_base(from, to)
+      def merge_base(*commits)
         wrapped_gitaly_errors do
-          gitaly_repository_client.find_merge_base(from, to)
+          gitaly_repository_client.find_merge_base(*commits)
         end
       end