Fix project transfer corrupting shared runners state

app/services/projects/transfer_service.rb

@@ -71,7 +71,10 @@ module Projects
       Project.transaction do
         project.expire_caches_before_rename(@old_path)
 
+        # Apply changes to the project
         update_namespace_and_visibility(@new_namespace)
+        update_shared_runners_settings
+        project.save!
 
         # Notifications
         project.send_move_instructions(@old_path)
@@ -84,10 +87,6 @@ module Projects
         # Move uploads
         move_project_uploads(project)
 
-        # If a project is being transferred to another group it means it can already
-        # have shared runners enabled but we need to check whether the new group allows that.
-        project.shared_runners_enabled = false if project.group && project.group.shared_runners_setting == 'disabled_and_unoverridable'
-
         project.old_path_with_namespace = @old_path
 
         update_repository_configuration(@new_path)
@@ -120,7 +119,6 @@ module Projects
       # Apply new namespace id and visibility level
       project.namespace = to_namespace
       project.visibility_level = to_namespace.visibility_level unless project.visibility_level_allowed_by_group?
-      project.save!
     end
 
     def update_repository_configuration(full_path)
@@ -208,6 +206,14 @@ module Projects
     def new_design_repo_path
       "#{new_path}#{::Gitlab::GlRepository::DESIGN.path_suffix}"
     end
+
+    def update_shared_runners_settings
+      # If a project is being transferred to another group it means it can already
+      # have shared runners enabled but we need to check whether the new group allows that.
+      if project.group && project.group.shared_runners_setting == 'disabled_and_unoverridable'
+        project.shared_runners_enabled = false
+      end
+    end
   end
 end
 

changelogs/unreleased/ak-fix-project-transfer.yml

+---
+title: Fix project transfer corrupting shared runners state
+merge_request: 48032
+author:
+type: fixed

spec/services/projects/transfer_service_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe Projects::TransferService do
   let_it_be(:group) { create(:group) }
   let(:project) { create(:project, :repository, :legacy_storage, namespace: user.namespace) }
 
-  subject(:execute_transfer) { described_class.new(project, user).execute(group) }
+  subject(:execute_transfer) { described_class.new(project, user).execute(group).tap { project.reload } }
 
   context 'with npm packages' do
     before do