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Re: Installer: GUIX_IMAGE as /dev/sda on some hardware?
From: |
Giovanni Biscuolo |
Subject: |
Re: Installer: GUIX_IMAGE as /dev/sda on some hardware? |
Date: |
Wed, 29 May 2019 21:49:41 +0200 |
Hello Tobias and Ludo'
I've opened a bug report for this, WDYT if we go on there?
Tobias Geerinckx-Rice <address@hidden> writes:
> Ludovic Courtès wrote:
>> Ideally, we’d use an actual UUID object (or a string?) here
>> rather than
>> this Linux/udev-specific idiom. […]
>> I believe using Guile-Parted we could map it back to a /dev
>> name.
>
> Yah, 's one of the reasons that I haven't sent anything yet (the
> main one being shame, of course; car/cdr for the win & all that).
>
>> Would that work?
>
> I'd looked in Guile-parted before but came up dry. To be fair I
> did little more than grep around for ‘uid’ and friends. So you
> tell me ;-)
>
> …
>
> Hum, wait a minute. Isn't that irrelevant? Doesn't Guix itself
> do exactly this when mounting file systems? Sigh, silly me, I
> should be able to re-use that… >_<
Grub supports quite a number of ways to specify devices [1] but I cannot
find something suitable for this purpose: am I missimg something
obvious?
AFAIU on ther distros (e.g. Debian) (the installer?) populates a device
map [2] using the grub-mkdevicemap utility (grub-common package in
Debian) but I cannot find that in our grub package
This is an example on one of my Debian hosts:
--8<---------------cut here---------------start------------->8---
$ cat /boot/grub/device.map
(hd0) /dev/disk/by-id/ata-WDC_WD10EADS-00L5B1_WD-WCAU4D992691
(hd1) /dev/disk/by-id/ata-ST3250620NS_9QE2L68Z
(hd2) /dev/disk/by-id/ata-ST3250620NS_9QE2FSQD
(hd3) /dev/disk/by-id/ata-ST3250620NS_9QE27YPJ
(hd4) /dev/disk/by-id/ata-WDC_WD7500BPKT-00PK4T0_WD-WX11A4181554
(hd5) /dev/disk/by-id/ata-WDC_WD7500BPKT-00PK4T0_WD-WXM1A61D0766
--8<---------------cut here---------------end--------------->8---
(the map is not updated)
We could use (hd?) in grub config - that's grub specific, not Linux/udev
specific - **but** we should find a way to automate the selection of the
device corresponding to our target (the one mounted as /mnt)
Thanks for working on this!!!
Happy hacking. Gio'.
[1] https://www.gnu.org/software/grub/manual/grub/html_node/Device-syntax.html
[2] https://www.gnu.org/software/grub/manual/grub/html_node/Device-map.html
--
Giovanni Biscuolo
Xelera IT Infrastructures
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