$ git clone -n https://src.fedoraproject.org/rpms/buildbox.git /var/lib/mock/f41-build-3154715-40629/root/chroot_tmpdir/scmroot/buildbox
Cloning into '/var/lib/mock/f41-build-3154715-40629/root/chroot_tmpdir/scmroot/buildbox'...
$ git fetch origin 191aa28b20df6efe144004c623fbb5dbbf53845b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildbox
 * [new ref]         191aa28b20df6efe144004c623fbb5dbbf53845b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 191aa28 Update to 1.2.33