$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2 /var/lib/mock/dist-oc8-build-26614-7552/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc8-build-26614-7552/root/chroot_tmpdir/scmroot/grub2'...
$ git reset --hard origin/oc8
HEAD is now at ccbcea4 update release