$ git clone -n https://src.fedoraproject.org/rpms/vrpn.git /var/lib/mock/f40-build-2250117-54033/root/chroot_tmpdir/scmroot/vrpn
Cloning into '/var/lib/mock/f40-build-2250117-54033/root/chroot_tmpdir/scmroot/vrpn'...
$ git fetch origin b9fa6f787bf4f1529d601f8a8493d55377c136e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vrpn
 * [new ref]         b9fa6f787bf4f1529d601f8a8493d55377c136e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9fa6f7 Unretire and update to 07.35