$ git clone -n https://src.fedoraproject.org/rpms/lua-luautf8.git /var/lib/mock/f45-build-17664-502/root/chroot_tmpdir/scmroot/lua-luautf8
Cloning into '/var/lib/mock/f45-build-17664-502/root/chroot_tmpdir/scmroot/lua-luautf8'...
$ git fetch origin d5b8d840a7dc8eb521f79afef3d3a87458dc5342:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-luautf8
 * [new ref]         d5b8d840a7dc8eb521f79afef3d3a87458dc5342 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5b8d84 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild