Move project default git depth behind feature flags

app/models/project_ci_cd_setting.rb

@@ -31,6 +31,8 @@ class ProjectCiCdSetting < ApplicationRecord
   private
   def set_default_git_depth
+    return unless Feature.enabled?(:ci_set_project_default_git_depth, default_enabled: true)
+
     self.default_git_depth ||= DEFAULT_GIT_DEPTH
   end
 end

app/presenters/ci/build_runner_presenter.rb

@@ -27,7 +27,7 @@ module Ci
     def git_depth
       if git_depth_variable
         git_depth_variable[:value]
-      else
+      elsif Feature.enabled?(:ci_project_git_depth, default_enabled: true)
         project.default_git_depth
       end.to_i
     end

spec/models/project_ci_cd_setting_spec.rb

@@ -48,5 +48,17 @@ describe ProjectCiCdSetting do
       expect(project.reload.ci_cd_settings.default_git_depth).to eq(0)
     end
+
+    context 'when feature flag :ci_set_project_default_git_depth is disabled' do
+      let(:project) { create(:project) }
+
+      before do
+        stub_feature_flags(ci_set_project_default_git_depth: { enabled: false } )
+      end
+
+      it 'does not set default value for new records' do
+        expect(project.ci_cd_settings.default_git_depth).to eq(nil)
+      end
+    end
   end
 end

spec/presenters/ci/build_runner_presenter_spec.rb

@@ -136,6 +136,16 @@ describe Ci::BuildRunnerPresenter do
     it 'defaults to git depth setting for the project' do
       expect(git_depth).to eq(build.project.default_git_depth)
     end
+
+    context 'when feature flag :ci_project_git_depth is disabled' do
+      before do
+        stub_feature_flags(ci_project_git_depth: { enabled: false })
+      end
+
+      it 'defaults to 0' do
+        expect(git_depth).to eq(0)
+      end
+    end
   end
   describe '#refspecs' do