UpdateMirror service return an error status when no mirror

CHANGELOG-EE

@@ -10,6 +10,7 @@ v 8.9.0 (unreleased)
   - Distribute RepositoryUpdateMirror jobs in time and add exclusive lease on them by project_id
   - [Elastic] Move ES settings to application settings
   - Disable mirror flag for projects without import_url
+  - UpdateMirror service return an error status when no mirror
   - Show flash notice when Git Hooks are updated successfully
   - [Elastic] Project members with guest role can't access confidential issues
   - Ability to lock file or folder in the repository

app/services/projects/update_mirror_service.rb

@@ -4,7 +4,9 @@ module Projects
     class UpdateError < Error; end
 
     def execute
-      return false unless project.mirror?
+      unless project.mirror?
+        return error("The project has no mirror to update")
+      end
 
       unless can?(current_user, :push_code_to_protected_branches, project)
         return error("The mirror user is not allowed to push code to all branches on this project.")

spec/services/projects/update_mirror_service_spec.rb

@@ -73,6 +73,18 @@ describe Projects::UpdateMirrorService do
         expect(result[:status]).to eq(:error)
       end
     end
+
+    describe "when is no mirror" do
+      let(:project) { build_stubbed(:project) }
+
+      it "fails" do
+        expect(project.mirror?).to eq(false)
+
+        result = described_class.new(project, build_stubbed(:user)).execute
+
+        expect(result[:status]).to eq(:error)
+      end
+    end
   end
 
   def stub_fetch_mirror(project, repository: project.repository)