removed the #ensure_ref_fetched from all controllers

also, I refactored the MergeRequest#fetch_ref method to express
the side-effect that this method has.

  MergeRequest#fetch_ref -> MergeRequest#fetch_ref!
  Repository#fetch_source_branch -> Repository#fetch_source_branch!

5 files changed, 5 insertions, 36 deletions

diff --git a/app/controllers/projects/merge_requests/application_controller.rb b/app/controllers/projects/merge_requests/application_controller.rb
index 0e71977a58a..1269759fc2b 100644
--- a/app/controllers/projects/merge_requests/application_controller.rb
+++ b/app/controllers/projects/merge_requests/application_controller.rb
@@ -2,7 +2,6 @@ class Projects::MergeRequests::ApplicationController < Projects::ApplicationCont
   before_action :check_merge_requests_available!
   before_action :merge_request
   before_action :authorize_read_merge_request!
-  before_action :ensure_ref_fetched
 
   private
 
@@ -10,12 +9,6 @@ class Projects::MergeRequests::ApplicationController < Projects::ApplicationCont
     @issuable = @merge_request ||= @project.merge_requests.find_by!(iid: params[:id])
   end
 
-  # Make sure merge requests created before 8.0
-  # have head file in refs/merge-requests/
-  def ensure_ref_fetched
-    @merge_request.ensure_ref_fetched if Gitlab::Database.read_write?
-  end
-
   def merge_request_params
     params.require(:merge_request).permit(merge_request_params_attributes)
   end
diff --git a/app/controllers/projects/merge_requests/creations_controller.rb b/app/controllers/projects/merge_requests/creations_controller.rb
index 99dc3dda9e7..129682f64aa 100644
--- a/app/controllers/projects/merge_requests/creations_controller.rb
+++ b/app/controllers/projects/merge_requests/creations_controller.rb
@@ -4,7 +4,6 @@ class Projects::MergeRequests::CreationsController < Projects::MergeRequests::Ap
   include RendersCommits
 
   skip_before_action :merge_request
-  skip_before_action :ensure_ref_fetched
   before_action :authorize_create_merge_request!
   before_action :apply_diff_view_cookie!, only: [:diffs, :diff_for_path]
   before_action :build_merge_request, except: [:create]
diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index 17cac69e588..c86acae8fe4 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -7,7 +7,6 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
   include IssuableCollections
 
   skip_before_action :merge_request, only: [:index, :bulk_update]
-  skip_before_action :ensure_ref_fetched, only: [:index, :bulk_update]
 
   before_action :authorize_update_issuable!, only: [:close, :edit, :update, :remove_wip, :sort]
 
@@ -52,7 +51,6 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
 
   def show
     validates_merge_request
-    ensure_ref_fetched
     close_merge_request_without_source_project
     check_if_can_be_merged
 
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 3133dc9e7eb..ccad8e102aa 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -426,7 +426,7 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def create_merge_request_diff
-    fetch_ref
+    fetch_ref!
 
     # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/37435
     Gitlab::GitalyClient.allow_n_plus_1_calls do
@@ -811,29 +811,14 @@ class MergeRequest < ActiveRecord::Base
     end
   end
 
-  def fetch_ref
-    write_ref
-    update_column(:ref_fetched, true)
+  def fetch_ref!
+    target_project.repository.fetch_source_branch!(source_project.repository, source_branch, ref_path)
   end
 
   def ref_path
     "refs/#{Repository::REF_MERGE_REQUEST}/#{iid}/head"
   end
 
-  def ref_fetched?
-    super ||
-      begin
-        computed_value = project.repository.ref_exists?(ref_path)
-        update_column(:ref_fetched, true) if computed_value
-
-        computed_value
-      end
-  end
-
-  def ensure_ref_fetched
-    fetch_ref unless ref_fetched?
-  end
-
   def in_locked_state
     begin
       lock_mr
@@ -975,10 +960,4 @@ class MergeRequest < ActiveRecord::Base
 
     project.merge_requests.merged.where(author_id: author_id).empty?
   end
-
-  private
-
-  def write_ref
-    target_project.repository.fetch_source_branch(source_project.repository, source_branch, ref_path)
-  end
 end
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 44a1e9ce529..3b6285f786d 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -982,8 +982,8 @@ class Repository
     gitlab_shell.fetch_remote(raw_repository, remote, forced: forced, no_tags: no_tags)
   end
 
-  def fetch_source_branch(source_repository, source_branch, local_ref)
-    raw_repository.fetch_source_branch(source_repository.raw_repository, source_branch, local_ref)
+  def fetch_source_branch!(source_repository, source_branch, local_ref)
+    raw_repository.fetch_source_branch!(source_repository.raw_repository, source_branch, local_ref)
   end
 
   def compare_source_branch(target_branch_name, source_repository, source_branch_name, straight:)