$ git clone -n https://src.fedoraproject.org/rpms/livesys-scripts.git /var/lib/mock/f39-build-1466071-33643/root/chroot_tmpdir/scmroot/livesys-scripts
Cloning into '/var/lib/mock/f39-build-1466071-33643/root/chroot_tmpdir/scmroot/livesys-scripts'...
$ git fetch origin 3d3958ec44238fd19c657dc0183cd21781efdf20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/livesys-scripts
 * [new ref]         3d3958ec44238fd19c657dc0183cd21781efdf20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d3958e Update to 0.5.0