$ git clone -n https://src.fedoraproject.org/rpms/tortoisehg.git /var/lib/mock/f42-bootstrap-3462966-45593/root/chroot_tmpdir/scmroot/tortoisehg
Cloning into '/var/lib/mock/f42-bootstrap-3462966-45593/root/chroot_tmpdir/scmroot/tortoisehg'...
$ git fetch origin d7756280bff0925a98ac482e2d52f2b1d4909780:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tortoisehg
 * [new ref]         d7756280bff0925a98ac482e2d52f2b1d4909780 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d775628 tortoisehg 6.9