$ git clone -n https://src.fedoraproject.org/rpms/bes.git /var/lib/mock/f41-build-1468867-23743/root/chroot_tmpdir/scmroot/bes
Cloning into '/var/lib/mock/f41-build-1468867-23743/root/chroot_tmpdir/scmroot/bes'...
$ git fetch origin 463fae073b0843772b2b0f7a6a0fc90ac36ff8c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bes
 * [new ref]         463fae073b0843772b2b0f7a6a0fc90ac36ff8c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 463fae0 Rebuild (gdal)