$ git clone -n https://gitee.com/wenyuzifang/tcpdump.git /var/lib/mock/dist-an23-build-466177-73955/root/chroot_tmpdir/scmroot/tcpdump
Cloning into '/var/lib/mock/dist-an23-build-466177-73955/root/chroot_tmpdir/scmroot/tcpdump'...
$ git fetch origin d5bb2544b8cf3de203cb9acddd04446602f24319:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/tcpdump
 * [new ref]         d5bb2544b8cf3de203cb9acddd04446602f24319 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5bb254 Update code from upstream