Gitolite and Gitlab - How the `www-data` user can checkout?

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http://serverfault.com – I have just installed Gitolite and Gitlab and I am very happy with it. Everything works fine so far. I can create repos, push to them, clone them on other clients on the network. Great! But now I wanted to do some post-receive hooks. I.e. when I push to some repo, this repo should be checked out on the server in the /var/www/repos directory. I did this with Gitlabs Deploy Hooks and this Endpoint-Script. The problem is that the scripts are run under the user "www-data" which has no access to gitlab/gitolite. How do I change this? I need to be able to checkout repos with www-data user and (HowTos)