bug#59466: Kernel panic when installing with Ventoy

[Tobias Geerinckx-Rice]

Hi Josselin,

Josselin Poiret via Bug reports for GNU Guix 写道：
> Ventoy is not supported currently. It is up to them to add 
> support for
> Guix, not the other way around: we have some peculiarities with 
> the boot
> process that Ventoy completely ignores.

Ah.  This is true of most dime-a-dozen ‘universal’ ISO booters, 
which merely source a GRUB .cfg and expect distributions to do all 
the work.  I'd shame them by name if they were memorable.  Guix 
indeed doesn't ‘support’ that!

Ventoy actually put some thought & effort into the process.  Like 
all clever hacks, there's some dependence on moon phase and luck, 
but it's not snake oil.

It injects some code into the boot process to expose the ISO file 
as a block device through Linux's device mapper.  Any distribution 
with dm-mod support, including Guix[0] (through dm-crypt), will 
see a ‘real’ block device straight from the kernel.  No distro 
cooperation is required beyond ‘please don't be too clever and 
peek behind the curtain’.  IME, Guix does not do so, and just 
works.

(So why does it fail here…?)

Kind regards,

T G-R

[0]: https://www.ventoy.net/en/distro_iso/gnu_guix.html but do 
note who submitted it ;-)

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