$ git clone -n https://gitee.com/fundawang/iperf3.git /var/lib/mock/dist-an23-build-288713-64871/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-an23-build-288713-64871/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 89439de2b964b39d6f43bd99b22fb712e8fe4c26:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/iperf3
 * [new ref]         89439de2b964b39d6f43bd99b22fb712e8fe4c26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89439de 3.14