$ git clone -n https://src.fedoraproject.org/rpms/callgit.git /var/lib/mock/f29-build-6060-1488/root/thebuilddir/tmp/scmroot/callgit
Cloning into '/var/lib/mock/f29-build-6060-1488/root/thebuilddir/tmp/scmroot/callgit'...
$ git reset --hard 40c7eaa3fabefe2d92defe469237942df404b22e
HEAD is now at 40c7eaa - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild