Declare swap partition in config

Declare swap partition in config

[w96k]

Is there any way to declare swap in config.scm without using swapon 
directly?

Re: Declare swap partition in config

[Julien Lepiller]

Le 13 septembre 2019 17:47:27 GMT+02:00, w96k@posteo.net a écrit :
>Is there any way to declare swap in config.scm without using swapon 
>directly?

In the mamual, I see operating-system has a swap-devices field. I think that's what you need :)

http://guix.gnu.org/manual/en/html_node/operating_002dsystem-Reference.html#operating_002dsystem-Reference

Re: Declare swap partition in config

[Antwane Mason]

For some reason, my guix system is not detecting my swap partition despite
it being configured in my config. However, performing swapon directly does
activity the partition. Is there an issue in my configuration? I am using
the newer "swap-space" data structure for swap due to generating it from
the installer a week ago.

Here is my swap device name and uuid from blkid:

/dev/nvme0n1p4: UUID="b7c057f7-c090-4a09-a94b-f92e66bdaebc"
TYPE="swsuspend" PARTUUID="65db7a7a-62bf-42de-b1c4-094e9fac6090"

Here is my swap-devices value for my config:

(swap-devices
    (list (swap-space
            (target
              (uuid "b7c057f7-c090-4a09-a94b-f92e66bdaebc")))))

Regards,
Antwane

Re: Declare swap partition in config

[Tobias Geerinckx-Rice]

On 2022-02-27 0:38, Antwane Mason wrote:
> TYPE="swsuspend"

You can only swapon(2) swap partitions.  Run

   $ sudo mkswap /dev/nvme0n1p4

and reboot, and it should work just fine.

swapon(8) does a lot more than merely call swapon(2), including 
overwriting any SWSUSPEND signature[0].

Guix does not do this.

It could, either at the expense of code manually kept in sync with 
util-linux, or by embedding a copy swapon(8) in the initrd, enlarging 
it.

Kind regards,

T G-R

Sent from a Web browser.  Excuse or enjoy my brevity.

[0]: 
https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/sys-utils/swapon.c#n371

Re: Declare swap partition in config

[Antwane Mason]

Tobias,

Thank you for your help! You were right that the partition type was the
problem.

Calling mkswap did not change the partition's type,  but deleting and
recreating the partition with the swap type worked. I had to change my
config with the new partition's UUID and then do system reconfigure.

Now, my swap partition is activated on start as expected!

Regards,
Antwane


On Sat, Feb 26, 2022 at 6:52 PM Tobias Geerinckx-Rice <me@tobias.gr> wrote:

> On 2022-02-27 0:38, Antwane Mason wrote:
> > TYPE="swsuspend"
>
> You can only swapon(2) swap partitions.  Run
>
>    $ sudo mkswap /dev/nvme0n1p4
>
> and reboot, and it should work just fine.
>
> swapon(8) does a lot more than merely call swapon(2), including
> overwriting any SWSUSPEND signature[0].
>
> Guix does not do this.
>
> It could, either at the expense of code manually kept in sync with
> util-linux, or by embedding a copy swapon(8) in the initrd, enlarging
> it.
>
> Kind regards,
>
> T G-R
>
> Sent from a Web browser.  Excuse or enjoy my brevity.
>
> [0]:
>
> https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/sys-utils/swapon.c#n371
>