$ git clone -n https://gitee.com/yan1hcdc/grub2.git /var/lib/mock/dist-an23-build-499442-74755/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-499442-74755/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin 326eddaad25e24cc4b152200f1116add86f87657:KOJI_FETCH_HEAD
From https://gitee.com/yan1hcdc/grub2
 * [new ref]         326eddaad25e24cc4b152200f1116add86f87657 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 326edda Support BOOTRISCV64.EFI