Re: btrfs and subvolumes for root

[Marius Bakke <mbakke@fastmail.com>]

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maze@strahlungsfrei.de writes:

> Am 2017-08-06 05:46, schrieb Fredrik Salomonsson:
>> Hello Guix,
>> 
>> I'm testing out setting up a dual boot between GuixSD and Arch. I've
>> no idea how much each one will take on disk. I decided to try out
>> btrfs and subvolumes for the layout.
>> 
>> But I'm having some issues booting the thing.
>> 
>> My disk layout right now is:
>> sda
>>   sda1      1MB BIOS boot
>>   sda2      4G  swap
>>   sda3 228.9GB  btrfs
>> 
>> then subvolumes:
>> sda3/
>>   __current/guixsd-root
>>   __current/arch-root
>>   __current/boot
>>   __current/home
>> 
>> section from my config.scm, which is based on my old config (old one
>> is attached).
>> 
>> (file-systems (cons* (file-system
>>    (device "root")
>>    (title 'label)
>>    (mount-point "/boot")
>>    (options
>> "defaults,discard,compress=lzo,space_cache,autodefrag,subvol=__current/boot")
>>    (dependecies mapped-devices))
>> ;; repeat for guixsd-root and home but with correct value for subvol
>> )
>> 
>> guix system init worked fine but when booting it fails to locate the
>> bzImage. Which I assume is because it doesn't know that the root is in
>> a subvolume.
>> 
>> Long story short. How do I add rootflags to GuixSD's grub menu entry?
>> Need to add "rootflags=subvol=__current/guixsd-root" to the
>> linux-arguments. Might be an issue of having boot as a subvolume as
>> well.
>> 
>> Thanks
>> 
>> --
>> 
>> s/Fred[re]+i[ck]+/Fredrik/g
>
> Hello Fredrik,
>
> I am having the same problem. Adjusting the kernel parameters for the 
> GuixSD kernel seems currently not supported.  Looking at the source code 
> though it looks like this could be achieved via manipulating the 
> "bootloader-configuration-menu-entries" list. (Still a scheme noob!)

Hello!

Adjusting kernel parameters can be done with 'kernel-arguments'.

Example:

(operating-system
  [...]
  (kernel-arguments '("modprobe.blacklist=pcspkr,snd_pcsp")))

HTH!

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