Raw gitlab automerge feature

app/controllers/merge_requests_controller.rb

@@ -2,7 +2,7 @@ class MergeRequestsController < ApplicationController
   before_filter :authenticate_user!
   before_filter :project
   before_filter :module_enabled
-  before_filter :merge_request, :only => [:edit, :update, :destroy, :show, :commits, :diffs]
+  before_filter :merge_request, :only => [:edit, :update, :destroy, :show, :commits, :diffs, :automerge]
   layout "project"
 
   # Authorize
@@ -95,6 +95,22 @@ class MergeRequestsController < ApplicationController
     end
   end
 
+  def automerge
+    message = ""
+    if GitlabMerge.new(@merge_request).merge
+      @merge_request.update_attributes(
+        :author_id_of_changes => current_user.id,
+        :closed => true
+      )
+      @merge_request.reload_code
+      message = "Successfully merged"
+    else
+      message = "Can not be merged"
+    end
+
+    redirect_to [@merge_request.project, @merge_request], :alert => message
+  end
+
   def destroy
     @merge_request.destroy
 

config/routes.rb

@@ -102,6 +102,7 @@ Gitlab::Application.routes.draw do
     resources :merge_requests do 
       member do 
         get :diffs
+        get :automerge
       end
 
       collection do 

lib/gitlab_merge.rb

+class GitlabMerge
+  attr_accessor :project, :merge_path, :merge_request
+
+  def initialize(merge_request)
+    self.merge_request = merge_request
+    self.project = merge_request.project
+    self.merge_path = File.join(Rails.root, "tmp", "merge_repo", project.path)
+    FileUtils.rm_rf(merge_path)
+    FileUtils.mkdir_p merge_path
+  end
+
+  def merge
+    self.project.repo.git.clone({:branch => merge_request.target_branch}, project.url_to_repo, merge_path)
+    output = ""
+    Dir.chdir(merge_path) do
+      merge_repo = Grit::Repo.new('.')
+      output = merge_repo.git.pull({}, "origin", merge_request.source_branch)
+      if output =~ /Automatic merge failed/
+        return false  
+      else 
+        merge_repo.git.push({}, "origin", merge_request.target_branch)
+        return true
+      end
+    end
+  end
+end