Recreate feature flags for merge trains

This commit recreates a feature flag for merge trains

ee/app/models/ee/project_ci_cd_setting.rb

@@ -8,9 +8,15 @@ module EE
       project.feature_available?(:merge_pipelines) && super
     end
 
+    ##
+    # The `disable_merge_trains` feature flag is meant to be used for dogfooding
+    # pipelines for merged results in gitlab-org/gitlab project.
+    # This feature flag is never meant to be enabled for the entire instance.
+    # See more context in https://gitlab.com/gitlab-org/gitlab/issues/200037
     def merge_trains_enabled?
-      merge_pipelines_enabled? && project.feature_available?(:merge_trains) &&
-        ::Feature.enabled?(:merge_trains_enabled, project, default_enabled: true)
+      return false if ::Feature.enabled?(:disable_merge_trains, project)
+
+      merge_pipelines_enabled? && project.feature_available?(:merge_trains)
     end
 
     def merge_pipelines_were_disabled?

ee/spec/features/merge_request/user_merges_immediately_spec.rb

@@ -24,6 +24,7 @@ describe 'Merge requests > User merges immediately', :js do
   end
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     stub_ci_pipeline_yaml_file(YAML.dump(ci_yaml))
 

ee/spec/features/merge_trains/two_merge_requests_on_train_spec.rb

@@ -28,6 +28,7 @@ describe 'Two merge requests on a merge train' do
   end
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     project.add_maintainer(maintainer_1)
     project.add_maintainer(maintainer_2)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)

ee/spec/features/merge_trains/user_adds_merge_request_to_merge_train_spec.rb

@@ -17,6 +17,7 @@ describe 'User adds a merge request to a merge train', :js do
   end
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     project.add_maintainer(user)
     project.update!(merge_pipelines_enabled: true)

ee/spec/features/merge_trains/user_adds_to_merge_train_when_pipeline_succeeds_spec.rb

@@ -15,6 +15,7 @@ describe 'User adds to merge train when pipeline succeeds', :js do
   let(:pipeline) { merge_request.all_pipelines.first }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     project.add_maintainer(user)
     project.update!(merge_pipelines_enabled: true)

ee/spec/models/project_ci_cd_setting_spec.rb

@@ -3,6 +3,10 @@
 require 'spec_helper'
 
 describe ProjectCiCdSetting do
+  before do
+    stub_feature_flags(disable_merge_trains: false)
+  end
+
   describe '#merge_pipelines_enabled?' do
     subject { project.merge_pipelines_enabled? }
 

ee/spec/serializers/merge_request_poll_widget_entity_spec.rb

@@ -11,6 +11,7 @@ describe MergeRequestPollWidgetEntity do
   let(:request) { double('request', current_user: user) }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     project.add_developer(user)
   end
 
@@ -33,7 +34,7 @@ describe MergeRequestPollWidgetEntity do
 
     context 'when the merge train feature is disabled' do
       before do
-        stub_feature_flags(merge_trains_enabled: false)
+        stub_feature_flags(disable_merge_trains: true)
       end
 
       it 'does not have merge trains count' do

ee/spec/services/auto_merge/add_to_merge_train_when_pipeline_succeeds_service_spec.rb

@@ -16,6 +16,7 @@ describe AutoMerge::AddToMergeTrainWhenPipelineSucceedsService do
   let(:pipeline) { merge_request.reload.all_pipelines.first }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_trains: true, merge_pipelines: true)
     project.add_maintainer(user)
     project.update!(merge_pipelines_enabled: true)

ee/spec/services/auto_merge/merge_train_service_spec.rb

@@ -20,6 +20,7 @@ describe AutoMerge::MergeTrainService do
 
     allow(AutoMergeProcessWorker).to receive(:perform_async) { }
 
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_trains: true, merge_pipelines: true)
     project.update!(merge_pipelines_enabled: true)
   end
@@ -263,7 +264,7 @@ describe AutoMerge::MergeTrainService do
 
     context 'when merge trains project option is disabled' do
       before do
-        stub_feature_flags(merge_trains_enabled: false)
+        stub_feature_flags(disable_merge_trains: true)
       end
 
       it { is_expected.to be_falsy }

ee/spec/services/merge_trains/check_status_service_spec.rb

@@ -9,6 +9,7 @@ describe MergeTrains::CheckStatusService do
   let(:previous_ref) { 'refs/heads/master' }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     project.update!(merge_pipelines_enabled: true)
   end

ee/spec/services/merge_trains/create_pipeline_service_spec.rb

@@ -9,6 +9,7 @@ describe MergeTrains::CreatePipelineService do
   let(:previous_ref) { 'refs/heads/master' }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     project.add_maintainer(maintainer)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     project.update!(merge_pipelines_enabled: true)
@@ -35,7 +36,7 @@ describe MergeTrains::CreatePipelineService do
 
     context 'when merge trains option is disabled' do
       before do
-        stub_feature_flags(merge_trains_enabled: false)
+        stub_feature_flags(disable_merge_trains: true)
       end
 
       it_behaves_like 'returns an error' do

ee/spec/services/merge_trains/refresh_merge_request_service_spec.rb

@@ -9,6 +9,7 @@ describe MergeTrains::RefreshMergeRequestService do
   let(:require_recreate) { false }
 
   before do
+    stub_feature_flags(disable_merge_trains: false)
     project.add_maintainer(maintainer)
     stub_licensed_features(merge_pipelines: true, merge_trains: true)
     project.update!(merge_pipelines_enabled: true)