$ git clone -n https://gitee.com/jessica-liu/grub2.git /var/lib/mock/dist-an23-build-448856-73423/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-448856-73423/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin eee2021c2bd30f3b8275acf746cfd2866ad8528e:KOJI_FETCH_HEAD
From https://gitee.com/jessica-liu/grub2
 * [new ref]         eee2021c2bd30f3b8275acf746cfd2866ad8528e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eee2021 Support BOOTRISCV64.EFI