$ git clone -n https://gitee.com/opencloudos-stream/libb2.git /var/lib/mock/dist-ocs23-build-34604-1659/root/chroot_tmpdir/scmroot/libb2
Cloning into '/var/lib/mock/dist-ocs23-build-34604-1659/root/chroot_tmpdir/scmroot/libb2'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/libb2
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ef046b !1 initial Merge pull request !1 from jeremiazhao/master