title: Make a GIT repository read only for some users using gitosis
body: <p>We are running a GIT repository using gitosis and we need to forbid the push to some people of the team.</p>
  
  <p>So i want everybody have read access to all repositories (got +10 repo and +20 machines where the users can do commit pull and push) </p>
  
  <p>I need to restrict only the push, i want user can continue doing pull and clone but not push, only 2 users can push to master.</p>
  
  <p>So any ideas? maybe to ask a password before make push?</p>