Defer updating .git/config for imported projects

Normally when a project is created, `Projects::CreateService` attempts
to initialize a Git directory and update the `.git/config` to include
the human-readable project full path.  However, for forks and project
imports, the repository is imported in a separate background job
(e.g. RepositoryForkWorker, RepositoryImportWorker). As a result,
attempts to write to the `.git/config` directory will fail unless the
job has completed first.

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/35305 will ensure
that the `.git/config` is updated after the import is successful. This
commit will prevent attempts to `.git/config` for project imports and
forks from occuring right after project creation.

app/services/projects/create_service.rb

@@ -84,8 +84,12 @@ module Projects
     def after_create_actions
       log_info("#{@project.owner.name} created a new project \"#{@project.full_name}\"")
 
+      # Skip writing the config for project imports/forks because it
+      # will always fail since the Git directory doesn't exist until
+      # a background job creates it (see Project#add_import_job).
+      @project.write_repository_config unless @project.import?
+
       unless @project.gitlab_project_import?
-        @project.write_repository_config
         @project.create_wiki unless skip_wiki?
       end
 

changelogs/unreleased/sh-disable-gitconfig-write-on-imports-and-forks.yml

+---
+title: Defer updating .git/config for imported projects
+merge_request: 35308
+author:
+type: fixed

spec/services/projects/create_service_spec.rb

@@ -240,13 +240,21 @@ RSpec.describe Projects::CreateService, '#execute' do
   end
 
   context 'import data' do
-    it 'stores import data and URL' do
-      import_data = { data: { 'test' => 'some data' } }
-      project = create_project(user, { name: 'test', import_url: 'http://import-url', import_data: import_data })
+    let(:import_data) { { data: { 'test' => 'some data' } } }
+    let(:imported_project) { create_project(user, { name: 'test', import_url: 'http://import-url', import_data: import_data }) }
+
+    it 'does not write repository config' do
+      expect_next_instance_of(Project) do |project|
+        expect(project).not_to receive(:write_repository_config)
+      end
 
-      expect(project.import_data).to be_persisted
-      expect(project.import_data.data).to eq(import_data[:data])
-      expect(project.import_url).to eq('http://import-url')
+      imported_project
+    end
+
+    it 'stores import data and URL' do
+      expect(imported_project.import_data).to be_persisted
+      expect(imported_project.import_data.data).to eq(import_data[:data])
+      expect(imported_project.import_url).to eq('http://import-url')
     end
   end