$ git clone -n https://gitee.com/mgb01105731/iperf3_1.git /var/lib/mock/dist-an23-build-340737-69846/root/chroot_tmpdir/scmroot/iperf3_1
Cloning into '/var/lib/mock/dist-an23-build-340737-69846/root/chroot_tmpdir/scmroot/iperf3_1'...
$ git fetch origin 71437e2d0045a7703a507768b50b5935455ac1d8:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/iperf3_1
 * [new ref]         71437e2d0045a7703a507768b50b5935455ac1d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71437e2 update to version 3.16