Merge branch 'zj-ensure-link-pool-repo-gc' into 'master'

Ensure pool participants are linked before GC

Closes gitaly#1354

See merge request gitlab-org/gitlab-ce!24230

app/models/project.rb

@@ -2039,6 +2039,10 @@ class Project < ActiveRecord::Base
     pool_repository&.unlink_repository(repository) && update_column(:pool_repository_id, nil)
   end
 
+  def link_pool_repository
+    pool_repository&.link_repository(repository)
+  end
+
   private
 
   def merge_requests_allowing_collaboration(source_branch = nil)

app/workers/git_garbage_collect_worker.rb

@@ -23,6 +23,7 @@ class GitGarbageCollectWorker
     end
 
     task = task.to_sym
+    project.link_pool_repository
     gitaly_call(task, project.repository.raw_repository)
 
     # Refresh the branch cache in case garbage collection caused a ref lookup to fail

app/workers/object_pool/join_worker.rb

@@ -5,14 +5,13 @@ module ObjectPool
     include ApplicationWorker
     include ObjectPoolQueue
 
-    def perform(pool_id, project_id)
-      pool = PoolRepository.find_by_id(pool_id)
-      return unless pool&.joinable?
-
+    # The use of pool id is deprecated. Keeping the argument allows old jobs to
+    # still be performed.
+    def perform(_pool_id, project_id)
       project = Project.find_by_id(project_id)
-      return unless project
+      return unless project&.pool_repository&.joinable?
 
-      pool.link_repository(project.repository)
+      project.link_pool_repository
 
       Projects::HousekeepingService.new(project).execute
     end

spec/workers/git_garbage_collect_worker_spec.rb

@@ -71,6 +71,17 @@ describe GitGarbageCollectWorker do
 
           subject.perform(project.id)
         end
+
+        context 'when the repository has joined a pool' do
+          let!(:pool) { create(:pool_repository, :ready) }
+          let(:project) { pool.source_project }
+
+          it 'ensures the repositories are linked' do
+            expect_any_instance_of(PoolRepository).to receive(:link_repository).once
+
+            subject.perform(project.id)
+          end
+        end
       end
 
       context 'when no lease can be obtained' do