$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc9-build-231621-81619/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc9-build-231621-81619/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin da210434f554d7f53bfbdb4dd649a8b3a70e915c:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         da210434f554d7f53bfbdb4dd649a8b3a70e915c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da21043 import grub2-2.12-16.tl4.ap.3