$ git clone -n https://src.fedoraproject.org/rpms/lightsoff.git /var/lib/mock/f42-build-side-1-3499490-45965/root/chroot_tmpdir/scmroot/lightsoff
Cloning into '/var/lib/mock/f42-build-side-1-3499490-45965/root/chroot_tmpdir/scmroot/lightsoff'...
$ git fetch origin 9693704b3112ff2354b490c60fd8ec975e31fe9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lightsoff
 * [new ref]         9693704b3112ff2354b490c60fd8ec975e31fe9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9693704 Update to 48.1