Local copy of the repository files

Hi,

I'm trying to make my git repository automatically make a local copy o f the repository files, but the appropriate command (or commands) is eluding me. Could somebody give me a hint (or point to the appropriate document) as of how to make it work?

In more details, what I need:

When one of our developers does commit/push his work to the server/repository, I need the files to be automatically copied/updated to a plain local folder (something like file://var/www/), so they are viewable through a web browser. Most of those files are php. I don't need an additional repository accessible with WebDAV, HTTP, or something alike. Just a copy of the working files, viewable if someone opens a browser and types the URL of our server.

I did configure a "remote" server pointing to that folder (using  git 
remote add test file:///var/www/), and 'git fetch test' does give me the 
following output:
 From file:///var/www
    203a9c7..b47fab5  master     -> test/master

So probably it´s working correctly. But a "git remote push" is not updating that folder. Also, I believe that probably I'm supposed to use a hook (probably post-update), but can't find out what exactly I should add in there. Would appreciate any ideas here.

Note: I'm using Debian 5.0-64bits, git 1.5.6.5 (from the apt repository).

Thanks,

Roberto