$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3 /var/lib/mock/dist-oc9-build-123313-72831/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc9-build-123313-72831/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21bdc43 import iperf3-3.18-1.tl4