NB : There’s even more information in the following excellent guide : http://scie.nti.st/2007/11/14/hosting-git-repositories-the-easy-and-secure-way
But there are some differences for Fedora that are worth spelling out.
Central Repository setup
First install gitosis :

central# yum install gitosis

Then create a dumb git user – noone will be logging in as this user: it’s just so that everything can be centralized :

central# [...]