$ git clone -n https://gitee.com/fundawang/iperf3.git /var/lib/mock/dist-an23-build-288712-64871/root/chroot_tmpdir/scmroot/iperf3
Cloning into '/var/lib/mock/dist-an23-build-288712-64871/root/chroot_tmpdir/scmroot/iperf3'...
$ git fetch origin e8f43d7c57677584428a3b6915ae3c28724c372e:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/iperf3
 * [new ref]         e8f43d7c57677584428a3b6915ae3c28724c372e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8f43d7 3.14