$ git clone -n https://src.fedoraproject.org/rpms/lua-mmdb.git /var/lib/mock/f45-build-17680-502/root/chroot_tmpdir/scmroot/lua-mmdb
Cloning into '/var/lib/mock/f45-build-17680-502/root/chroot_tmpdir/scmroot/lua-mmdb'...
$ git fetch origin b04b27e848753062297ec4bb1266bc5ae1fc2198:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-mmdb
 * [new ref]         b04b27e848753062297ec4bb1266bc5ae1fc2198 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b04b27e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild