--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -219,6 +219,33 @@ class Repository < ActiveRecord::Base
     cloners.create(:ip => ip, :date => Time.now.utc, :country_code => country_code, :country => country_name)
   end
   
+  def status_file(action, count = nil)
+    count = git.commit_count("HEAD") if !count
+    File.join(RAILS_ROOT, "tmp", "repos",
+             "#{project.slug}_#{self.name}_#{count}_#{action}.status")
+  end
+  
+  def has_changed?(action, head = "master")
+    count = git.commit_count(head)
+    !File.exist?(status_file(action, count))
+  end
+  
+  def keep_status!(action, head = "master")
+    count = git.commit_count(head)
+    filepath = status_file(action, count)
+    if !File.directory?(File.dirname(filepath))
+      FileUtils.mkpath(File.dirname(filepath))
+    end
+    
+    Dir[status_file(action, "*")].each do |st|
+      File.unlink(st)
+    end
+    
+    File.open(filepath, "w") do |file|
+      file << Time.now.to_i
+    end
+  end
+  
   protected
     def set_as_mainline_if_first
       unless project.repositories.size >= 1

--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -307,6 +307,31 @@ describe Repository do
     users.values.map(&:login).sort.should == users(:johan, :moe).map(&:login).sort
   end
   
+  it "should keep the status file" do
+    mock_path = Dir.tmpdir+"/repo_status"
+    
+    my_git = Grit::Repo.new(@repository.full_repository_path)
+    @repository.should_receive(:git).and_return(my_git)
+    
+    my_git.should_receive(:commit_count).with("master").and_return(10)
+    @repository.should_receive(:status_file).with("spec", 10).and_return(mock_path)
+    @repository.should_receive(:status_file).with("spec", "*").and_return("")
+    Dir.should_receive("[]").and_return([])
+    @repository.keep_status!("spec")
+  end
+  
+  it "should return the status file path" do
+    @repository.status_file("spec", 10).should =~ /_10_spec\.status$/
+  end
+  
+  it "should know if the repository was changed" do
+    my_git = Grit::Repo.new(@repository.full_repository_path)
+    @repository.should_receive(:git).and_return(my_git)
+    my_git.should_receive(:commit_count).with("master").and_return(10)
+    
+    @repository.has_changed?("spec", "master").should == true
+  end
+  
   describe "observers" do
     it "sends an email to the admin if there's a parent" do
       Mailer.should_receive(:deliver_new_repository_clone).with(@repository).and_return(true)