$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3.git /var/lib/mock/dist-oc9-build-185759-80238/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc9-build-185759-80238/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 1cb5f8f629950750f41a6e8d7b4896881e218cf6:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new ref]         1cb5f8f629950750f41a6e8d7b4896881e218cf6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cb5f8f import iperf3-3.18-2.tl4