$ git clone -n https://src.fedoraproject.org/rpms/lightsoff.git /var/lib/mock/f42-build-3427010-45200/root/chroot_tmpdir/scmroot/lightsoff
Cloning into '/var/lib/mock/f42-build-3427010-45200/root/chroot_tmpdir/scmroot/lightsoff'...
$ git fetch origin 5caae2f5ff75b42bc4a5fffcf4b5de2d61af5e03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lightsoff
 * [new ref]         5caae2f5ff75b42bc4a5fffcf4b5de2d61af5e03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5caae2f Update to 48.0