$ git clone -n https://gitee.com/src-opencloudos-rpms/grub2.git /var/lib/mock/dist-oc9-build-119205-69680/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-oc9-build-119205-69680/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin b20c349282f08f2ff32c4d3a0402b79d51db64cf:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/grub2
 * [new ref]         b20c349282f08f2ff32c4d3a0402b79d51db64cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b20c349 import grub2-2.12-7.tl4