From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: guix system init co-existing with other distros
Date: Tue, 23 Feb 2016 14:40:34 +0100
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In-Reply-To: <87oab93c9t.fsf@drakenvlieg.flower> (Jan Nieuwenhuizen's message
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To: Jan Nieuwenhuizen <janneke@gnu.org>
Cc: guix-devel@gnu.org

Jan Nieuwenhuizen <janneke@gnu.org> skribis:

> So what I need is for Guix's Grub to create an extra menu entry
> for Debian, with this text
>
>     menuentry 'Debian GNU/Linux' {
> 	linux	/boot/vmlinuz-3.16.0-4-amd64 root=3D/dev/sda3 ro
> 	initrd	/boot/initrd.img-3.16.0-4-amd64
>     }
>
> When you specify extra an extra menu-entry
>
>        (list (menu-entry
>              (label "debian")
>              (linux "<file-name>")
>              (initrd "<file-name>))
>
> then grub.scm:(grub-configuration-file) appends "/" "bzImage" to the
> kernel's file-name
>
>     (define linux-image-name
>         (if (string-prefix? "mips" system)
>             "vmlinuz"
>             "bzImage"))
>
> So, I setup some symlinks on the Debian side so that I can provide Guix's
> Grub wih a kernel file name that can have "/bzImage" appended.
>
>     23:42:13 janneke@drakenvlieg:~/src/guix
>     $ ls -l /debian/boot/latest/
>     totaal 0
>     lrwxrwxrwx 1 root root 28  6 feb 21:17 bzImage -> /boot/vmlinuz-3.16.=
0-4-amd64
>     lrwxrwxrwx 1 root root 31  6 feb 21:17 initrd -> /boot/initrd.img-3.1=
6.0-4-amd64
>
> Possibly we'd want to add another keyword
>
>          (linux-image "(hd0,msdos3)/boot/vmlinuz-3.16.0-4-amd64")
>
> that gets used literally?

Oh, I see.  This is what <http://bugs.gnu.org/20067> is about.
I think the solution would be to not guess file names, indeed.

Until this is fixed, I don=E2=80=99t have any good solution other than hacks
like the one you propose.  :-/

Ludo=E2=80=99.