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Re: How to use custom grub?


From: Danny Milosavljevic
Subject: Re: How to use custom grub?
Date: Thu, 3 Nov 2016 17:50:51 +0100

Hi Marius,

yeah, I've noticed that problem, too.

David and I got some steps in the direction of fixing it (for U-Boot support):

The U-Boot support patch generalized this, see my E-Mail to this list, subject 
"[WIP PATCH] gnu: add U-Boot support to operating-system" on 09 Sep 2016 at 
20:09.

The relevant part is:
- guix/scripts/system.scm: The "install" routine is changed to also accept the 
bootloader package as argument (variable is called "grub" to keep the number of 
trivial patch chunks low).
- guix/scripts/system.scm: The new "install-bootloader*" routine is introduced 
instead of "install-grub*" to also accept the bootloader package as argument.

If you want you can cherry-pick these changes. I've reconfigured and booted 
with that patch. It works.

I'm not sure how the build side picks up which package's grub-install is 
invoked (gnu/build/install.scm just invokes "grub-install" without any further 
path specification).

I've asked about it before (multiple times now) and apparently nobody knows. If 
someone finds out, gnu/build/install.scm install-grub after the patch accepts 
the grub-name and could just invoke grub-install correctly. I *think* it's fine 
to just (string-append grub-name "/bin/grub-install") or something - but that's 
something I don't want to guess.

David knows more about the VM side - the patch also addresses this by carring 
around the bootloader als variable "grub" (which is not necessarily actually 
grub).

I hope that helps.



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