$ git clone -n https://src.fedoraproject.org/rpms/gamerzillagobj.git /var/lib/mock/f40-build-757771-119487/root/chroot_tmpdir/scmroot/gamerzillagobj
Cloning into '/var/lib/mock/f40-build-757771-119487/root/chroot_tmpdir/scmroot/gamerzillagobj'...
$ git fetch origin a1e311ef883aa5fd46f52d181ba5d2c01a4cf2a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gamerzillagobj
 * [new ref]         a1e311ef883aa5fd46f52d181ba5d2c01a4cf2a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1e311e Update to new release.