Run 'git gc' every 10 pushes

app/services/git_push_service.rb

@@ -49,6 +49,8 @@ class GitPushService < BaseService
     # Update merge requests that may be affected by this push. A new branch
     # could cause the last commit of a merge request to change.
     update_merge_requests
+
+    perform_housekeeping
   end
 
   def update_main_language
@@ -73,6 +75,12 @@ class GitPushService < BaseService
     ProjectCacheWorker.perform_async(@project.id)
   end
 
+  def perform_housekeeping
+    housekeeping = Projects::HousekeepingService.new(@project)
+    housekeeping.increment!
+    housekeeping.execute if housekeeping.needed?
+  end
+
   def process_default_branch
     @push_commits = project.repository.commits(params[:newrev])
 

app/services/projects/housekeeping_service.rb

@@ -21,7 +21,19 @@ module Projects
       end
 
       GitlabShellWorker.perform_async(:gc, @project.path_with_namespace)
-      return "Housekeeping successfully started"
+      @project.pushes_since_gc = 0
+      @project.save!
+
+      "Housekeeping successfully started"
+    end
+
+    def needed?
+      @project.pushes_since_gc >= 10
+    end
+
+    def increment!
+      @project.pushes_since_gc += 1
+      @project.save!
     end
 
     private

db/migrate/20160314143402_projects_add_pushes_since_gc.rb

+class ProjectsAddPushesSinceGc < ActiveRecord::Migration
+  def change
+    add_column :projects, :pushes_since_gc, :integer, default: 0
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160309140734) do
+ActiveRecord::Schema.define(version: 20160314143402) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -711,6 +711,7 @@ ActiveRecord::Schema.define(version: 20160309140734) do
     t.boolean  "pending_delete",         default: false
     t.boolean  "public_builds",          default: true,     null: false
     t.string   "main_language"
+    t.integer  "pushes_since_gc",        default: 0
   end
 
   add_index "projects", ["builds_enabled", "shared_runners_enabled"], name: "index_projects_on_builds_enabled_and_shared_runners_enabled", using: :btree

spec/services/git_push_service_spec.rb

@@ -401,6 +401,33 @@ describe GitPushService, services: true do
     end
   end
 
+  describe "housekeeping" do
+    let(:housekeeping) { instance_double('Projects::HousekeepingService', increment!: nil, needed?: false) }
+
+    before do
+      allow(Projects::HousekeepingService).to receive(:new).and_return(housekeeping)
+    end
+
+    it 'does not perform housekeeping when not needed' do
+      expect(housekeeping).not_to receive(:execute)
+
+      execute_service(project, user, @oldrev, @newrev, @ref)
+    end
+
+    it 'performs housekeeping when needed' do
+      expect(housekeeping).to receive(:needed?).and_return(true)
+      expect(housekeeping).to receive(:execute)
+
+      execute_service(project, user, @oldrev, @newrev, @ref)
+    end
+
+    it 'increments the push counter' do
+      expect(housekeeping).to receive(:increment!)
+ 
+      execute_service(project, user, @oldrev, @newrev, @ref)
+    end
+  end
+
   def execute_service(project, user, oldrev, newrev, ref)
     service = described_class.new(project, user, oldrev: oldrev, newrev: newrev, ref: ref )
     service.execute

spec/services/projects/housekeeping_service_spec.rb

@@ -37,4 +37,12 @@ describe Projects::HousekeepingService do
       expect(subject.needed?).to eq(true)
     end
   end
+
+  describe :increment! do
+    it 'increments the pushes_since_gc counter' do
+      expect(project.pushes_since_gc).to eq(0)
+      subject.increment!
+      expect(project.pushes_since_gc).to eq(1)
+    end
+  end
 end