Re: UEFI multiboot

From	Max Nikulin <manikulin@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: UEFI multiboot
Date	2024-08-30 18:10 +0200
Message-ID	<Jhcmd-8Klv-11@gated-at.bofh.it> (permalink)
References	(7 earlier) <Je201-6Eon-3@gated-at.bofh.it> <Je6wF-6HsV-1@gated-at.bofh.it> <JecC5-6Lc2-1@gated-at.bofh.it> <JesQx-6Wav-7@gated-at.bofh.it> <Jeupj-6X1t-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 23/08/2024 11:39, Felix Miata wrote:
> I don't know what vexing secure boot might introduce, but without it,
> GRUB_DISTRIBUTOR= was used by grub-install in Trixie here to produce
> results I expected:
[...]
> # grep TOR /etc/default/grub
> GRUB_DISTRIBUTOR="debian13"
[...]
> ├── debian13
> │   └── grubx64.efi
> ├── opensuse

How does grubx64.efi find where grub.cfg is located? Is it compatible 
with Secure Boot? It is the reason why your experiment is not convincing.

I have tried some variants of full shim+grub signed configurations on 
the laptop with buggy firmware where I experienced troubles several 
years ago. The results have surprised me and they are the same as for 
qemu with OVMF instance.

grubx64.efi (v2.06) from Debian bookworm has no problem with reading 
grub.cfg placed in the same directory and directory name does not matter.

grubx64.efi (v2.06) from Ubuntu 20.04 focal reads config file strictly 
from EFI/ubuntu/grub.cfg.

I have not figured out what specific patch causes the difference. A lot 
of lines are changed. I do not think it is a security measure. Perhaps 
something is broken in attempts to improve booting from network.

There was a similar issue with Debian
https://bugs.debian.org/932966
and devuan still used EFI/debian when bootloader id "devuan" is used,
patches have not dropped (but perhaps just to avoid issues with existing 
installations).

A couple of problems that I have noticed in bookworm:

1. When /usr/lib/shim/BOOTX64.CSV is installed, bootloader id in it is 
not adjusted. As a result if additional removable path EFI/BOOT is used 
then there is a chance that fbx64.efi will create "debian" boot entry, 
not the name specified in GRUB_DISTRIBUTOR

2. It is not apparent that after modifying GRUB_DISTRIBUTOR it is 
necessary to create the directory with matched name in /boot/efi/EFI. 
Otherwise "dpkg-reconfigure grub-efi-amd64" does not run grub-install. I 
would prefer to have an explicit setting instead of relying on presence 
of a directory.

The main point is that I did not expect that Debian and Ubuntu may 
diverge in so subtle way. I believed fixed .cfg path is a UEFI 
limitation or at best an inherent grub limitation.

Thread

Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-19 13:20 +0200
  Re: Default partition mounts [ "Installation Guide" lacks index ] David <bouncingcats@gmail.com> - 2024-08-19 14:10 +0200
    Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-19 15:50 +0200
      Re: Default partition mounts [ "Installation Guide" lacks index ] Joe <joe@jretrading.com> - 2024-08-19 18:00 +0200
        Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-19 20:20 +0200
  Re: Default partition mounts [ "Installation Guide" lacks index ] Andy Smith <andy@strugglers.net> - 2024-08-19 22:00 +0200
    Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-20 10:50 +0200
      Re: Default partition mounts [ "Installation Guide" lacks index ] "Andrew M.A. Cater" <amacater@einval.com> - 2024-08-20 11:40 +0200
        Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-20 12:50 +0200
          Trixie and i386 - was [Re: Default partition mounts [ "Installation  Guide" lacks index ]] Richard Owlett <rowlett@access.net> - 2024-08-20 14:40 +0200
            Re: Trixie and i386 - was [Re: Default partition mounts [  "Installation Guide" lacks index ]] Charles Curley <charlescurley@charlescurley.com> - 2024-08-20 15:50 +0200
            Future of i386 as installer "Andrew M.A. Cater" <amacater@einval.com> - 2024-08-20 15:50 +0200
      The lack of a future for 32-bit x86 installs (Was Re: Default  partition mounts [ "Installation Guide" lacks index ]) Andy Smith <andy@strugglers.net> - 2024-08-20 17:20 +0200
        Re: The lack of a future for 32-bit x86 installs (Was Re: Default  partition mounts [ "Installation Guide" lacks index ]) Roberto C. Sánchez <roberto@debian.org> - 2024-08-20 18:10 +0200
  Re: Default partition mounts [ "Installation Guide" lacks index ] Tom Dial <tddial@comcast.net> - 2024-08-20 00:50 +0200
    Re: Default partition mounts [ "Installation Guide" lacks index ] David Wright <deblis@lionunicorn.co.uk> - 2024-08-20 05:20 +0200
      Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-20 10:10 +0200
  Re: Default partition mounts [ "Installation Guide" lacks index ] David Christensen <dpchrist@holgerdanske.com> - 2024-08-20 06:30 +0200
    Re: Default partition mounts [ "Installation Guide" lacks index ] Richard Owlett <rowlett@access.net> - 2024-08-20 10:20 +0200
    UEFI multiboot (was: Re: Default partition mounts [ "Installation  Guide" lacks index ]) Max Nikulin <manikulin@gmail.com> - 2024-08-20 17:20 +0200
      Re: UEFI multiboot (was: Re: Default partition mounts [  "Installation Guide" lacks index ]) Erwan David <erwan@rail.eu.org> - 2024-08-20 17:30 +0200
      Re: UEFI multiboot (was: Re: Default partition mounts [  "Installation Guide" lacks index ]) Nicolas George <george@nsup.org> - 2024-08-20 18:00 +0200
        Re: UEFI multiboot (was: Re: Default partition mounts [ "Installation  Guide" lacks index ]) Jeffrey Walton <noloader@gmail.com> - 2024-08-20 18:30 +0200
          Re: UEFI multiboot gene heskett <gheskett@shentel.net> - 2024-08-20 22:20 +0200
        Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-21 06:00 +0200
          Re: UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-08-21 06:30 +0200
            Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-21 18:20 +0200
              Re: UEFI multiboot Nicolas George <george@nsup.org> - 2024-08-21 19:40 +0200
              Re: UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-08-22 00:30 +0200
                Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-22 05:20 +0200
                Re: UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-08-22 11:50 +0200
                Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-22 18:00 +0200
                Re: UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-08-22 22:50 +0200
                [SUMMARY] Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-23 05:10 +0200
                Re: [SUMMARY] UEFI multiboot Felix Miata <mrmazda@earthlink.net> - 2024-08-23 06:50 +0200
                Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-30 18:10 +0200
                Re: UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-08-30 18:50 +0200
                Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-08-31 04:20 +0200
                [SUMMARY] Re: UEFI multiboot Max Nikulin <manikulin@gmail.com> - 2024-09-14 06:10 +0200
                Re: [SUMMARY] UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-09-14 06:40 +0200
                Re: [SUMMARY] UEFI multiboot songbird <songbird@anthive.com> - 2024-09-14 19:40 +0200
                Re: [SUMMARY] UEFI multiboot Felix Miata <mrmazda@stanis.net> - 2024-09-14 21:20 +0200
                Re: [SUMMARY] UEFI multiboot "Thomas Schmitt" <scdbackup@gmx.net> - 2024-09-14 21:40 +0200
                Re: [SUMMARY] UEFI multiboot Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 12:20 +0200
                Re: [SUMMARY] UEFI multiboot songbird <songbird@anthive.com> - 2024-09-17 01:50 +0200
                Re: UEFI multiboot Joe <joe@jretrading.com> - 2024-08-22 12:00 +0200
          Re: UEFI multiboot Nicolas George <george@nsup.org> - 2024-08-21 08:50 +0200
            Re: UEFI multiboot Joe <joe@jretrading.com> - 2024-08-21 09:20 +0200

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