$ git clone -n https://src.fedoraproject.org/rpms/fluxbox.git /var/lib/mock/f40-build-796520-140694/root/chroot_tmpdir/scmroot/fluxbox
Cloning into '/var/lib/mock/f40-build-796520-140694/root/chroot_tmpdir/scmroot/fluxbox'...
$ git fetch origin 50456aaf0108f9ff278a61a6461a0bd31306f2b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fluxbox
 * [new ref]         50456aaf0108f9ff278a61a6461a0bd31306f2b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50456aa Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild