Merge branch 'sh-handle-deleted-project-mirror' into 'master'

Ignore unknown project ID in RepositoryUpdateMirrorWorker

Projects that are in pending_delete could still trigger the mirror,
leading to undefined method `mark_import_as_failed` errors and
repeated Sidekiq retries.

See merge request !754

app/workers/repository_update_mirror_worker.rb

@@ -10,10 +10,13 @@ class RepositoryUpdateMirrorWorker
 
   def perform(project_id)
     begin
-      @project = Project.find(project_id)
-      @current_user = @project.mirror_user || @project.creator
+      project = Project.find(project_id)
 
-      result = Projects::UpdateMirrorService.new(@project, @current_user).execute
+      return unless project
+
+      @current_user = project.mirror_user || project.creator
+
+      result = Projects::UpdateMirrorService.new(project, @current_user).execute
       if result[:status] == :error
         project.mark_import_as_failed(result[:message])
         return
@@ -21,9 +24,10 @@ class RepositoryUpdateMirrorWorker
 
       project.import_finish
     rescue => ex
+      if project
         project.mark_import_as_failed("We're sorry, a temporary error occurred, please try again.")
-
         raise UpdateMirrorError, "#{ex.class}: #{Gitlab::UrlSanitizer.sanitize(ex.message)}"
       end
     end
+  end
 end

spec/workers/repository_update_mirror_worker_spec.rb

@@ -19,5 +19,9 @@ describe RepositoryUpdateMirrorWorker do
       expect { described_class.new.perform(project.id) }
         .to change { project.reload.import_status }.to('failed')
     end
+
+    it 'does nothing if project does not exist' do
+      expect(described_class.new.perform(1000000)).to be_nil
+    end
   end
 end