Comment 4 for bug 913336

This patch is not sufficient, as grub-install calls grub-editenv /boot/grub/grubenv create unconditionally. I've attached another patch which stops grub-install from creating grubenv when /boot/grub is on ZFS.

If we care about the possible use case of an admin who doesn't want grubenv, further work will be required; otherwise it'll come back on every GRUB package upgrade. However, this use case isn't covered now, so I'd hate to see the ZFS fix held up on that.