$ git clone -n https://src.fedoraproject.org/rpms/lua-penlight.git /var/lib/mock/f45-build-17684-502/root/chroot_tmpdir/scmroot/lua-penlight
Cloning into '/var/lib/mock/f45-build-17684-502/root/chroot_tmpdir/scmroot/lua-penlight'...
$ git fetch origin c53b8b38001b3b6c10801a977cf0c9b1ff6beb75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-penlight
 * [new ref]         c53b8b38001b3b6c10801a977cf0c9b1ff6beb75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c53b8b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild