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From: "Ludovic Courtès" <ludo@gnu.org>
To: "Jan \(janneke\) Nieuwenhuizen" <janneke@gnu.org>
Cc: Mathieu Othacehe <othacehe@gnu.org>, 41350@debbugs.gnu.org
Subject: [bug#41350] [PATCH v2 3/3] system: vm: Build vm-image using native qemu, for the Hurd.
Date: Wed, 20 May 2020 23:58:52 +0200	[thread overview]
Message-ID: <87367ue09v.fsf@gnu.org> (raw)
In-Reply-To: <20200519072302.9202-3-janneke@gnu.org> (Jan Nieuwenhuizen's message of "Tue, 19 May 2020 09:23:02 +0200")

Howdy!

"Jan (janneke) Nieuwenhuizen" <janneke@gnu.org> skribis:

> Cross-building a vm-image is usually done using a cross-qemu, e.g, qemu-ARM,
> because, e.g., a native, x86_64 Grub cannot install an armhf-Grub.  That
> solution does not work for the Hurd, as there is no qemu-HURD.
>
> This patch enables cross building vm-images for the Hurd using a native qemu
> vm.
>
> * gnu/system/vm.scm (expression->derivation-in-linux-vm): Run native
> qemu-command; use native linux, initrd, bootloader-package and
> bootloader-installer, for the Hurd.
> [preserve-target]: New helper to install cross-packages into the native vm.
> * gnu/bootloader/grub.scm (eye-candy): Use native font, for the Hurd.
>
> Co-authored-by: Ludovic Courtès <ludo@gnu.org>

I think the big question here, not Hurd-specific, is about the
abstractions:

  1. When cross-compiling, can the ‘qemu-image’ procedure to its job by
     running exclusively native software (in particular using a native
     QEMU, native kernel, etc.)?

  2. What should ‘expression->derivation-in-linux-vm’ do when
     cross-compiling?

I think the answer to (1) is yes, right?  That is, we can build a QEMU
image for AArch64/EFI from an x86_64 box.  That means we’d run the
x86_64/EFI ‘grub-install’ in the final step, an x86_64 ‘mke2fs’ and
‘parted’ to create the partitions, and so on.  Likewise, we can create a
QEMU GNU/Hurd image without entirely on GNU/Linux.

As for (2), I’d say that when cross-compiling, it should just run native
software but simply preserve references to cross-compiled software,
which is what janneke’s patch does.

How does that sound?  Mathieu?

(I guess I’m rewording what janneke wrote, but my mind became fuzzy last
time I looked at it, so I thought it’s best to double-check.  :-))

Thanks!

Ludo’.




  parent reply	other threads:[~2020-05-20 22:00 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-17 10:01 [bug#41350] [PATCH 0/3] Use native qemu to build vm-image Jan Nieuwenhuizen
2020-05-17 10:03 ` [bug#41350] [PATCH 1/3] utils: Move 'reset-timestamps' out of database Jan (janneke) Nieuwenhuizen
2020-05-17 10:03   ` [bug#41350] [PATCH 2/3] system: vm: Do not register-closures when cross-building Jan (janneke) Nieuwenhuizen
2020-05-17 10:03   ` [bug#41350] [PATCH 3/3] system: vm: Build vm-image using native qemu Jan (janneke) Nieuwenhuizen
2020-05-18  9:10 ` [bug#41350] [PATCH 0/3] Use native qemu to build vm-image Mathieu Othacehe
2020-05-19  7:22   ` Jan Nieuwenhuizen
2020-05-19 10:02     ` Mathieu Othacehe
2020-05-20 14:03       ` Mathieu Othacehe
2020-05-20 15:09         ` Jan Nieuwenhuizen
2020-05-19  7:23 ` [bug#41350] [PATCH v2 1/3] utils: Move 'reset-timestamps' out of database Jan (janneke) Nieuwenhuizen
2020-05-19  7:23   ` [bug#41350] [PATCH v2 2/3] system: vm: Do not register-closures when cross-building to the Hurd Jan (janneke) Nieuwenhuizen
2020-05-19  7:23   ` [bug#41350] [PATCH v2 3/3] system: vm: Build vm-image using native qemu, for " Jan (janneke) Nieuwenhuizen
2020-05-19  9:14     ` Mathieu Othacehe
2020-05-20 21:49       ` Ludovic Courtès
2020-05-23  9:28       ` Jan Nieuwenhuizen
2020-05-23 17:45         ` Mathieu Othacehe
2020-05-23 19:07           ` Jan Nieuwenhuizen
2020-05-24  9:18             ` Mathieu Othacehe
2020-05-27  9:30               ` Ludovic Courtès
2020-05-28  7:00                 ` Mathieu Othacehe
2020-05-24 11:19             ` Jan Nieuwenhuizen
2020-05-24 12:07               ` Mathieu Othacehe
2020-05-24 14:20                 ` Jan Nieuwenhuizen
2020-05-24 16:36             ` Ludovic Courtès
2020-05-20 21:58     ` Ludovic Courtès [this message]
2020-05-22 19:24 ` Mathieu Othacehe
2020-05-27 22:54   ` Ludovic Courtès
2020-05-28  6:36     ` Mathieu Othacehe
2020-05-28 12:29       ` Jan Nieuwenhuizen
2020-05-28 15:39         ` Ludovic Courtès
2020-05-28 17:07           ` Jan Nieuwenhuizen
2020-05-28 17:10           ` Mathieu Othacehe
2020-05-28 18:19             ` Jan Nieuwenhuizen
2020-05-29  8:18             ` Ludovic Courtès
2020-05-29  9:06               ` Jan Nieuwenhuizen
2020-05-30 10:08                 ` Jan Nieuwenhuizen
2020-05-30 13:54                   ` Ludovic Courtès
2022-09-28 20:18                     ` [bug#41350] [PATCH 0/3] Use native qemu to build vm-image Maxim Cournoyer
2022-09-29 14:17                       ` bug#41350: " Mathieu Othacehe
2020-05-23  9:30 ` [bug#41350] [PATCH v3 1/3] utils: Move 'reset-timestamps' out of database Jan (janneke) Nieuwenhuizen
2020-05-23  9:30   ` [bug#41350] [PATCH v3 2/3] system: vm: Do not register-closures when cross-building to the Hurd Jan (janneke) Nieuwenhuizen
2020-05-27  8:45     ` Ludovic Courtès
2020-05-27  9:13       ` Jan Nieuwenhuizen
2020-05-23  9:30   ` [bug#41350] [PATCH v3 3/3] system: vm: Build vm-image using native qemu, for " Jan (janneke) Nieuwenhuizen
2020-05-27  8:43   ` [bug#41350] [PATCH v3 1/3] utils: Move 'reset-timestamps' out of database Ludovic Courtès
2020-05-27  8:59     ` Ludovic Courtès
2020-05-27  9:10     ` Jan Nieuwenhuizen
2020-05-24 18:11 ` [bug#41350] [PATCH v2 3/3] system: vm: Build vm-image using native qemu, for the Hurd Mathieu Othacehe
2020-05-24 18:40   ` Jan Nieuwenhuizen
2020-05-25 15:46     ` Jan Nieuwenhuizen

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