gitosis: software for hosting git repositories
Fundgrube:
gitosis [1] aims to make hosting git repos easier and safer. It manages multiple repositories under one user account, using SSH keys to identify users. End users do not need shell accounts on the server, they will talk to one shared account that will not let them run arbitrary commands.
Alles was man wissen muss steht hier [2].
[1] http://eagain.net/gitweb/?p=gitosis.git
[2] http://archive.daniel-baumann.ch/debian/documents/cheatpages/gitosis.html