$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2 /var/lib/mock/dist-oc8-build-57926-15795/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc8-build-57926-15795/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin oc8:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new branch]      oc8        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5001f2c import grub2-2.02-150.tl3.1