#30311 - efi-less grub install fails

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>
To: Marius Bakke <mbakke@fastmail.com>
Subject: Re: bug#30311: efi-less grub install fails
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Marius Bakke <mbakke@fastmail.com> writes:

> Danny Milosavljevic <dannym@scratchpost.org> writes:
>
>> Hi Ricardo,
>>
>> On Wed, 31 Jan 2018 19:55:58 +0100
>> Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de> wrote:
>>
>>> “guix system init” fails with a configuration file that specifies
>>> grub-bootloader (not grub-efi-bootloader).
>>> 
>>> “grub-install” reports an error about “lib/grub/x86_64-efi/modinfo.sh”
>>> not being available.  It suggests passing “--target” or “--device”.
>>> 
>>> Our invocation of grub-install does not include a “--target” argument.
>>> Only after I edited it to pass “--target=i386-pc” did “guix system init”
>>> pass.
>>
>> Hmm, I wonder what happened here.
>>
>> We've been very careful to keep grub and grub-efi separate.
>>
>> The entire directory lib/grub/x86_64-efi shouldn't be available in the
>> "grub" package output - and I checked on master, it isn't.  Good.
>>
>> So that leaves automatic target selection as the culprit.
>>
>> And indeed, there's a call to grub_install_get_default_x86_platform
>> in util/grub-install.c .  And that checks for availability of
>> /sys/firmware/efi and if it exists, defaults to EFI.
>>
>> I think it's a bug in grub to do that for a grub which doesn't have EFI
>> platform support. :P
>>
>> We could just always pass i386-pc in install-grub for i386, but then
>> we lose i386-ieee1275 (which I have never heard anyone using so maybe
>> not so bad).
>
> I agree, passing --target seems like the best workaround for this GRUB
> bug.

Okay, I’ve added “--target=i386-pc” to the list of arguments.

Thanks for the comments.

-- 
Ricardo

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#30311 efi-less grub install fails