$ git clone -n https://src.fedoraproject.org/rpms/luarocks.git /var/lib/mock/f45-build-17714-503/root/chroot_tmpdir/scmroot/luarocks
Cloning into '/var/lib/mock/f45-build-17714-503/root/chroot_tmpdir/scmroot/luarocks'...
$ git fetch origin f69e94b2cd171e210e05e6f48c55398186fe13d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luarocks
 * [new ref]         f69e94b2cd171e210e05e6f48c55398186fe13d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f69e94b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild