$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3.git /var/lib/mock/dist-oc8-build-123460-72815/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc8-build-123460-72815/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 57b82d80dd43e1aef0a39b2bceaf212f9d347dab:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new ref]         57b82d80dd43e1aef0a39b2bceaf212f9d347dab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57b82d8 import iperf3-3.5-11.tl3