$ git clone -n https://gitee.com/xht8015/grub2.git /var/lib/mock/dist-an23-build-480077-74220/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-480077-74220/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 4e364294cdc57a9985871e65ad6d34ea0bb8edc2:KOJI_FETCH_HEAD
From https://gitee.com/xht8015/grub2
 * [new ref]         4e364294cdc57a9985871e65ad6d34ea0bb8edc2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e36429 Add support for riscv64