$ git clone -n https://gitee.com/wenyuzifang/tmux.git /var/lib/mock/dist-an23-build-466763-73992/root/chroot_tmpdir/scmroot/tmux
Cloning into '/var/lib/mock/dist-an23-build-466763-73992/root/chroot_tmpdir/scmroot/tmux'...
$ git fetch origin f1639cd4923e4bab9b438e18bb6accf11fc305db:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/tmux
 * [new ref]         f1639cd4923e4bab9b438e18bb6accf11fc305db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1639cd Update code from upstream