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[bug#27695] [PATCH 1/2] bootloader: Add grub-hybrid-bootloader.
From: |
Danny Milosavljevic |
Subject: |
[bug#27695] [PATCH 1/2] bootloader: Add grub-hybrid-bootloader. |
Date: |
Thu, 20 Jul 2017 20:42:07 +0200 |
> I hope someone else knows. I don't have EFI hardware so I'm really the wrong
> person to find out that stuff. Well I could try reading the documentation /
> asking and hoping that it's all correct, but ... you know... paper is patient
> :)
I read up on EFI some more. Apparently EFI can load files from FAT partitions
and execute them.
There's the tool "grub-mkstandalone" which will put the GRUB bootloader into an
executable file that you can then put on the FAT partition - which the EFI
system will later boot from.
So I guess we already do all that's required for installed-hybrid support
because Marius already added the grub-mkstandalone invocation to
gnu/build/vm.scm - and we install the traditional grub-pc otherwise. So isn't
it already hybrid? Can't be far off.
Maybe I contributed to the confusion, but my meddling with grub-efi and
grub-hybrid is really just to have grub-mkrescue build a hybrid ISO, nothing
else. I don't use grub-install at all there (and I don't use grub-mkstandalone
either).
I think the best way forward for the ISO image to do it like that:
* Add grub-hybrid to (gnu packages bootloaders) - but don't add a (gnu
bootloaders) entry. Don't use grub-hybrid for anything except when creating
the ISO image.
* Either make gnu/system/install.scm directly depend on grub-hybrid as
"bootloader" package - or just have make-iso9660-image always override it by
grub-hybrid.
That's it. I don't think we have to fiddle with the regular Guix bootloaders
or even with the existing bootloader packages at all.