This package should use just the content of the git tree. If you need
to make changes, you have the following options:
* Make them in git and update the package from git (you can send merge
  request if you don't have write access or if you want your patch to be
  reviewed)
* Create a patch, add the patch to the package and let one of the
  ceph packagers commit it for you

The online repository is at:
http://github.com/SUSE/ceph

For building the package from git run the service directly:
osc service disabledrun

This generates a new tarball from the git branch specified in _service and
extracts ceph.spec (which is itself generated from ceph.spec.in, which is
maintained in git) from it.