Expire the branch cache after `git gc` runs

Due to a stale NFS cache, it's possible that a branch lookup fails
while `git gc` is running and causes missing branches in merge requests.

Possible workaround for #15392

1 files changed, 24 insertions, 0 deletions

diff --git a/spec/workers/git_garbage_collect_worker_spec.rb b/spec/workers/git_garbage_collect_worker_spec.rb
new file mode 100644
index 00000000000..a9cce8b8b59
--- /dev/null
+++ b/spec/workers/git_garbage_collect_worker_spec.rb
@@ -0,0 +1,24 @@
+require 'spec_helper'
+
+describe GitGarbageCollectWorker do
+  let(:project) { create(:project) }
+  let(:shell) { Gitlab::Shell.new }
+
+  subject { GitGarbageCollectWorker.new }
+
+  before do
+    allow(subject).to receive(:gitlab_shell).and_return(shell)
+  end
+
+  describe "#perform" do
+    it "runs `git gc`" do
+      expect(shell).to receive(:gc).with(
+        project.repository_storage_path,
+        project.path_with_namespace).
+      and_return(true)
+      expect_any_instance_of(Repository).to receive(:after_create_branch)
+
+      subject.perform(project.id)
+    end
+  end
+end