$ git clone -n https://gitee.com/wenyuzifang/tcpdump.git /var/lib/mock/dist-an23-build-486819-74383/root/chroot_tmpdir/scmroot/tcpdump
Cloning into '/var/lib/mock/dist-an23-build-486819-74383/root/chroot_tmpdir/scmroot/tcpdump'...
$ git fetch origin d9732d5045264444ad17ee9b09c662d8f8c66b51:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/tcpdump
 * [new ref]         d9732d5045264444ad17ee9b09c662d8f8c66b51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9732d5 Update code from upstream