bug#35995: Installer: GUIX_IMAGE as /dev/sda on some hardware?

[Giovanni Biscuolo <g@xelera.eu>]

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Hello Tobias and Ludo'

I've opened a bug report for this, WDYT if we go on there?

Tobias Geerinckx-Rice <me@tobias.gr> 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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