$ git clone -n https://src.fedoraproject.org/rpms/bemenu.git /var/lib/mock/f40-build-801393-143777/root/chroot_tmpdir/scmroot/bemenu
Cloning into '/var/lib/mock/f40-build-801393-143777/root/chroot_tmpdir/scmroot/bemenu'...
$ git fetch origin fdfc6b7666c4b66121b8133b3b08d66a14dd0fb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bemenu
 * [new ref]         fdfc6b7666c4b66121b8133b3b08d66a14dd0fb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdfc6b7 Update to version 0.6.21 (rhbz#2268426)