$ git clone -n https://src.fedoraproject.org/rpms/fennel.git /var/lib/mock/f45-build-8918-397/root/chroot_tmpdir/scmroot/fennel
Cloning into '/var/lib/mock/f45-build-8918-397/root/chroot_tmpdir/scmroot/fennel'...
$ git fetch origin 39287d38cb170f0d694dcfce1f65f7ea73ef6899:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fennel
 * [new ref]         39287d38cb170f0d694dcfce1f65f7ea73ef6899 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39287d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild