$ git clone -n https://gitee.com/wenyuzifang/tcpdump.git /var/lib/mock/dist-an23-build-464345-73881/root/chroot_tmpdir/scmroot/tcpdump
Cloning into '/var/lib/mock/dist-an23-build-464345-73881/root/chroot_tmpdir/scmroot/tcpdump'...
$ git fetch origin c2a50c9d2f38764f09fe3277eb357d3283e1e54d:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/tcpdump
 * [new ref]         c2a50c9d2f38764f09fe3277eb357d3283e1e54d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2a50c9 Update code from upstream