$ git clone -n https://gitee.com/xinlong-chen/grub2 /var/lib/mock/dist-ocs23-riscv-base-build-322786-34356/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-ocs23-riscv-base-build-322786-34356/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/xinlong-chen/grub2
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6018c4 add support for riscv64