$ git clone -n https://gitee.com/opencloudos-stream/grub2.git /var/lib/mock/dist-ocs23-build-133020-9422/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-ocs23-build-133020-9422/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/grub2
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12f53d2 !6 update to version 2.12 Merge pull request !6 from nilusyi/master