Install Gitosis on CentOS how-to

Source1: http://scie.nti.st/2007/11/14/hosting-git-repositories-the-easy-and-secure-way
Source2: http://wiki.centos.org/HowTos/Network/SecuringSSH

[On server side, login as root]
1. Install gitosis
   cd ~/src
   git clone git://eagain.net/gitosis.git
   cd gitosis
   yum install python-setuptools
   python setup.py install
2. Create a user who will own the repositories you want to manage. Usually called "git".
   useradd git
3. Copy your public key to the server (howard's $HOME/.ssh/ on server)
   [On local machine]
   scp ~/.ssh/id_rsa.pub howard@10.0.0.10:~/.ssh/
      [Create one if you don't have it, on local machine]

      ssh-keygen -t rsa

      . Both public and private key will be stored in ~/.ssh/, name id_rsa.pub and id_rsa
      . Change the permission as following:
         . chmod 700 ~/.ssh
         . chmod 600 ~/.ssh/id_rsa
4. Install public key to the authorized_keys list in order to log on with public/private key instead of password prompt
   [On local machine]
   ssh howard@10.0.0.10 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
   ssh howard@10.0.0.10 chmod 700 ~/.ssh
   ssh howard@10.0.0.10 chmod 600 ~/.ssh/authorized_keys
   . Now you will be log on to 10.0.0.10 without entering password
5. Init gitosis-admin repository
   . Copy howard's public key to tmp folder in case user "git"cannot access it in howard's $HOME/.ssh
   cp /home/howard/.ssh/id_rsa.pub /tmp
   . Now to init gitosis-admin repository
   sudo -H -u git gitosis-init < /tmp/id_rsa.pub
   chmod 755 /home/git/repositories/gitosis-admin.git/hooks/post-update
6. Change user "git"'s home directory to /home/git/repositories
7. Clone the gitosis-admin repository into your local machine
   [On local machine]
   . Find a place where you would like to create gitosis-admin repository
   git clone ssh://git@10.0.0.10:~/gitosis-admin.git
8. Now you have gitosis.conf file and keydir directory under gitosis-admin repository
   . With these 2 files, you can define access right for every user and all is done locally and push the changes to the server.

Creating new repositories [On local machine]
1. To allow howard creates/writes "ViewerRepo" repository, edit gitosis.conf and add following
   [group team1]
   members = howard
   writable = ViewerRepo
2. Save it and push to remote server
   git commit -a -m "Allow howard write access to ViewerRepo"
   git push
3. Now howard has access to create/write the ViewerRepo. But it's not created yet. let's create it now.
   mkdir ViewerRepo
   cd ViewerRepo
   git init
   git remote add origin git@10.0.0.10:~/ViewerRepo
   // git add and commit files
   git push origin master:refs/heads/master
4. Adding user aaron
   . Simply copy aaron' public keys to gitosis-admin/keydir/, when done, add to git
   git add keydir/aaron.pub
   . Edit gitosis.conf accordingly
   Change "members = howard" to "members = howard aaron"
   . Update the settings to remote server
   git commit -a -m "Granted aaron commit rights to ViewerRepo"
   git push
5. Now aaron can clone the ViewerRepo and working on it
   git clone git@10.0.0.10:~/ViewerRepo