$ git clone -n https://gitee.com/wenyuzifang/tmux.git /var/lib/mock/dist-an23-build-466768-73992/root/chroot_tmpdir/scmroot/tmux
Cloning into '/var/lib/mock/dist-an23-build-466768-73992/root/chroot_tmpdir/scmroot/tmux'...
$ git fetch origin 83ba2f79d891fd6c323492826f073ed9627233b1:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/tmux
 * [new ref]         83ba2f79d891fd6c323492826f073ed9627233b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83ba2f7 Update code from upstream