$ git clone -n https://src.fedoraproject.org/rpms/rpmbuild-order.git /var/lib/mock/f45-build-34656-690/root/chroot_tmpdir/scmroot/rpmbuild-order
Cloning into '/var/lib/mock/f45-build-34656-690/root/chroot_tmpdir/scmroot/rpmbuild-order'...
$ git fetch origin 27f340a03b9881c40167ff91a1da26b8408d8cd9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmbuild-order
 * [new ref]         27f340a03b9881c40167ff91a1da26b8408d8cd9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27f340a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild