$ git clone -n https://src.fedoraproject.org/rpms/lua-filesystem.git /var/lib/mock/f45-build-17649-502/root/chroot_tmpdir/scmroot/lua-filesystem
Cloning into '/var/lib/mock/f45-build-17649-502/root/chroot_tmpdir/scmroot/lua-filesystem'...
$ git fetch origin 5ff8839e8c5f6f6590448c7acac9396489fa9a16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-filesystem
 * [new ref]         5ff8839e8c5f6f6590448c7acac9396489fa9a16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ff8839 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild