$ git clone -n https://gitee.com/gcdota930915/grub2.git /var/lib/mock/dist-an23-build-542691-85795/root/chroot_tmpdir/scmroot/grub2
Cloning into '/var/lib/mock/dist-an23-build-542691-85795/root/chroot_tmpdir/scmroot/grub2'...
$ git fetch origin d4a1f8f0e7953f9242a91ca91be5b2a531f2e0d4:KOJI_FETCH_HEAD
From https://gitee.com/gcdota930915/grub2
 * [new ref]         d4a1f8f0e7953f9242a91ca91be5b2a531f2e0d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4a1f8f x86-efi: use EFI_LOADER_CODE for kernel memory allocation