$ git clone -n https://src.fedoraproject.org/rpms/lua-md5.git /var/lib/mock/f45-build-17679-502/root/chroot_tmpdir/scmroot/lua-md5
Cloning into '/var/lib/mock/f45-build-17679-502/root/chroot_tmpdir/scmroot/lua-md5'...
$ git fetch origin c1d1515deb3b990ca8544ae030dd9a1422f25190:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-md5
 * [new ref]         c1d1515deb3b990ca8544ae030dd9a1422f25190 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1d1515 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild