$ git clone -n https://gitee.com/opencloudos-stream/6tunnel.git /var/lib/mock/dist-oc9-epol-build-90212-58996/root/chroot_tmpdir/scmroot/6tunnel
Cloning into '/var/lib/mock/dist-oc9-epol-build-90212-58996/root/chroot_tmpdir/scmroot/6tunnel'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/6tunnel
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7230f8a package init