$ git clone -n https://src.fedoraproject.org/rpms/libmks.git /var/lib/mock/f45-build-16558-487/root/chroot_tmpdir/scmroot/libmks
Cloning into '/var/lib/mock/f45-build-16558-487/root/chroot_tmpdir/scmroot/libmks'...
$ git fetch origin f10d4e581edfaf055c200b1cea95e5403726f47d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmks
 * [new ref]         f10d4e581edfaf055c200b1cea95e5403726f47d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f10d4e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild