$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3.git /var/lib/mock/dist-oc8-build-81731-55848/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc8-build-81731-55848/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 2657a6783555aec1f429da881dfe6a2fa7b5621b:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new ref]         2657a6783555aec1f429da881dfe6a2fa7b5621b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2657a67 import iperf3-3.5-10.tl3