[Nix-dev] nixos-rebuild fails on updating GRUB 2 menu

[Karn Kallio]

Hello,

The new grub2 expression caused nixos-rebuild to fail with the error
updating GRUB 2 menu...
cp: cannot stat `/nix/store/mhh92zbvhd6jrf09phqis1c4kp1ji89n-
grub-1.99rc1/share/grub/unicode.pf2': No such file or directory


SVN commit r26239 is a quick patch to the GRUB expression to make nixos-
rebuild work again; but perhaps a GRUB expert could look this over.