Implement /internal/pre-receive for shell operations

lib/api/internal.rb

@@ -143,6 +143,14 @@ module API
         { success: true, recovery_codes: codes }
       end
 
+      post '/pre_receive' do
+        status 200
+
+        reference_counter_increased = Gitlab::ReferenceCounter.new(params[:gl_repository]).increase
+
+        { reference_counter_increased: reference_counter_increased }
+      end
+
       post "/notify_post_receive" do
         status 200
 

spec/requests/api/internal_spec.rb

@@ -5,6 +5,8 @@ describe API::Internal do
   let(:key) { create(:key, user: user) }
   let(:project) { create(:project, :repository) }
   let(:secret_token) { Gitlab::Shell.secret_token }
+  let(:gl_repository) { "project-#{project.id}" }
+  let(:reference_counter) { double('ReferenceCounter') }
 
   describe "GET /internal/check" do
     it do
@@ -672,9 +674,7 @@ describe API::Internal do
   # end
 
   describe 'POST /internal/post_receive' do
-    let(:gl_repository) { "project-#{project.id}" }
     let(:identifier) { 'key-123' }
-    let(:reference_counter) { double('ReferenceCounter') }
 
     let(:valid_params) do
       {
@@ -760,6 +760,22 @@ describe API::Internal do
     end
   end
 
+  describe 'POST /internal/pre_receive' do
+    let(:valid_params) do
+      { gl_repository: gl_repository, secret_token: secret_token }
+    end
+
+    it 'decreases the reference counter and returns the result' do
+      expect(Gitlab::ReferenceCounter).to receive(:new).with(gl_repository)
+        .and_return(reference_counter)
+      expect(reference_counter).to receive(:increase).and_return(true)
+
+      post api("/internal/pre_receive"), valid_params
+
+      expect(json_response['reference_counter_increased']).to be(true)
+    end
+  end
+
   def project_with_repo_path(path)
     double().tap do |fake_project|
       allow(fake_project).to receive_message_chain('repository.path_to_repo' => path)