Fix for gitosis in ubuntu 12.04 (which didn't work before the fix)

[jmcabo]

Hello!
In Ubuntu 12.04 the hooks didn't work. Pushing to the gitosis-admin repo didn't
refresh the config file or the ssh keys.

There were two problems with the post-update hook for the gitosis-admin repo.

1. It wasn't executable, and needed chmod +x

         chmod +x  <gitosis_home>/repositories/gitosis-admin.git/hooks/post-update

2. It used old git commands, which are found now in '/usr/lib/git-core' as symlinks.
   The fix for that is to add:

         PATH=$PATH:/usr/lib/git-core
         export PATH

to the first lines of the 'post-update' hook.

After this, it works like a charm.
Please include the fix if you can, so that other people can use gitosis in ubuntu.
Thanks so much for gitosis!!!!

[tv42]

Should be covered by these:

commit e7d8875
Author: Tommi Virtanen tv@eagain.net
Date: 2015-01-22 10:43:30 -0800

Use dashless form for git update-server-info

commit 28dfea5
Author: Tommi Virtanen tv@eagain.net
Date: 2015-01-22 10:39:26 -0800

Make sure admin repo post-update hook is executable