$ git clone -n https://gitee.com/src-opencloudos-rpms/iperf3.git /var/lib/mock/dist-oc9-build-122992-72621/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-oc9-build-122992-72621/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 21bdc43fcc4f9b700b7cbe4966af5e598e7901db:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/iperf3
 * [new ref]         21bdc43fcc4f9b700b7cbe4966af5e598e7901db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21bdc43 import iperf3-3.18-1.tl4