$ git clone -n https://src.fedoraproject.org/rpms/lua-psl.git /var/lib/mock/f45-build-17691-502/root/chroot_tmpdir/scmroot/lua-psl
Cloning into '/var/lib/mock/f45-build-17691-502/root/chroot_tmpdir/scmroot/lua-psl'...
$ git fetch origin 75c47bbf2c187057f5b933f33b476a8a4ef4f8f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-psl
 * [new ref]         75c47bbf2c187057f5b933f33b476a8a4ef4f8f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75c47bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild