$ git clone -n https://gitee.com/fundawang/iperf3.git /var/lib/mock/dist-an23-build-288716-64871/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-an23-build-288716-64871/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin 37f339d224d5f8915603cb1f1c3610eab78e71ca:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/iperf3
 * [new ref]         37f339d224d5f8915603cb1f1c3610eab78e71ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37f339d update