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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: |
Sat, 25 May 2019 15:16:28 +0200 |
Hi Tobias,
thanks for sharing your experience, I'm cross posting to guix-devel
since it's worth discussing a patch to the installer
Tobias Geerinckx-Rice <address@hidden> writes:
> Giovanni Biscuolo wrote:
>> This is **very** important when installing grub, in fact grub
>> installation failed when instantiating my config.scm on the HP
>> ProLiant
>> simply because it was on /dev/sda pointing to the USB media;
>
> /dev/xdyN names have never been safe to use in this way
I'm not talking about partitions ;-)
According my faulty memory (I cannot reproduce it now)
/dev/sd<something> is what the Installer writes in the bootloader
section of config.scm:
--8<---------------cut here---------------start------------->8---
(bootloader
(bootloader-configuration
(bootloader grub-bootloader)
(target "/dev/sda")
(keyboard-layout keyboard-layout)))
--8<---------------cut here---------------end--------------->8---
and that caused the Installer to fail on grub-install since /dev/sda was
my USB media, (fortunately it failed because there was no space for grub
:-) )
On the other hand, by setting "/dev/sdb" whould made grub-install
succeed when running from USB but fail when running from the system
itself
[...]
>> 3. how is the USB media "relocated" to the last /dev/sd? device
>> by the installer?
>
> It's… not?
So it's pure coincidence that grub-install on /dev/sda succeedes on the
whole set of machines users are installing via USB media? :-O
> Dev nodes & names are doled out by the kernel. As
> you've discovered, they aren't to be relied on, and you should use
> labels or UUIDs instead.
Labels and UUIDs are for volumes, not for the whole disk ;-)
I'm not talking about filesystem config, where using labels or UUIDS is
strongly recommended (and used by the Installer), I'm talking about
grub-install config
But wait! There's the /dev/disk/by-id/ tree, I did not notice it until
now! :-)
That's the solution:
--8<---------------cut here---------------start------------->8---
(bootloader
(bootloader-configuration
(bootloader grub-bootloader)
(target "/dev/disk/by-id/scsi-3600508b1001c75a3bebb04b23d19e249")
(keyboard-layout keyboard-layout)))
--8<---------------cut here---------------end--------------->8---
I did not test this but it smells like running, if Guix devels agree I
think Installer should adopt /dev/disk/by-id by default, sorry I'm not
able to propose a patch for this
[...]
> Hoping to have scared you into using UUIDs,
Yes! You did it (albeit it is disk/by-id and not UUIDs) :-D
Thanks for your suggestions! Gio'.
--
Giovanni Biscuolo
Xelera IT Infrastructures
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