$ git clone -n https://src.fedoraproject.org/rpms/bfs.git /var/lib/mock/f40-build-2335715-59397/root/chroot_tmpdir/scmroot/bfs
Cloning into '/var/lib/mock/f40-build-2335715-59397/root/chroot_tmpdir/scmroot/bfs'...
$ git fetch origin 3b8954ce9d76c7d6533039371edbbb548d941938:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bfs
 * [new ref]         3b8954ce9d76c7d6533039371edbbb548d941938 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b8954c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild