$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3.git /var/lib/mock/dist-oc9-build-248214-83678/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc9-build-248214-83678/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 6eec6b856f5ff8d8c554369ab49256679e432cc4:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new ref]         6eec6b856f5ff8d8c554369ab49256679e432cc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6eec6b8 import iperf3-3.21-1.tl4