$ git clone -n https://gitee.com/src-anolis-os/iperf3.git /var/lib/mock/dist-an23-build-341181-69876/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-an23-build-341181-69876/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/src-anolis-os/iperf3
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71437e2 update to version 3.16