bug#46555: LVM swap continuously fails guix system: error: service 'swap-/dev/mapper/guix-swap' requires 'device-mapping-guix-swap', which is not provided by any service

[Shyam Saran]

Hi

after reconfigure

building /gnu/store/qnskr1r67lp92bgy136hqvm7r96s3qrd-upgrade-shepherd-services.scm.drv...
guix system: warning: exception caught while executing 'start' on service 'swap-/dev/mapper/guix-swap':
In procedure swapon: "/dev/mapper/guix-swap": Invalid argument
guix system: warning: some services could not be upgraded
hint: To allow changes to all the system services to take effect, you will need to reboot.

after 2 reboots also

$ cat /proc/swaps                                                                                                                                          27s
Filename Type Size Used Priority
$ swapon -s

$ sudo swapon -s

$ swapon --all --verbose

$ sudo swapon --all --verbose
$

I do not see swap is getting enabled.

Thanks

On Tue, 2 Mar 2021 at 16:12, Shyam Saran <syamsaran12345@gmail.com> wrote:

Sorry

I had forgot to remove

dependency from /boot/efi

So it was causing this error

attached the file, reconfiguring the whole system

hoping it must work

Thanks very much for all the help :)

On Tue, 2 Mar 2021 at 16:04, Shyam Saran <syamsaran12345@gmail.com> wrote:

As mentioned I had removed all dependency for root "/" fs

but result is same

$ guix  system   build ~/tmp/config.scm
guix system: warning: the following groups appear more than once: users
guix system: error: service 'swap-/dev/mapper/guix-swap' requires 'device-mapping-guix-swap', which is not provided by any service

Then again removed all dependencies from all fs /var /gnu /tmp etc

But the result is the same.

$ guix  system   build ~/tmp/config.scm
guix system: warning: the following groups appear more than once: users
guix system: error: service 'swap-/dev/mapper/guix-swap' requires 'device-mapping-guix-swap', which is not provided by any service

Thanks

On Mon, 1 Mar 2021 at 14:56, Ludovic Courtès <ludo@gnu.org> wrote:

Hi Shyam,

Shyam Saran <syamsaran12345@gmail.com> skribis:

> Result of application of system build command
>
> $ guix  system   build ~/tmp/config.scm
>
>                2s
> guix system: warning: the following groups appear more than once: users
> guix system: error: service 'swap-/dev/mapper/guix-swap' requires
> 'device-mapping-guix-swap', which is not provided by any service

The problem here is that you had:

  (file-system
    (mount-point "/")
    ;; …
    (needed-for-boot? #t)
    (dependencies %localmachine-mapped-devices))

All the needed-for-boot file systems had all the mapped devices in
‘dependencies’.  Thus, no ‘device-mapping-guix-swap’ Shepherd service
was created, because that device mapping was needed at boot.

The solution is to remove the ‘dependencies’ field for all your file
systems.  Since they have /dev/mapper/… as their ’device’, you don’t
need ‘dependencies’: it’s automatically inferred.  If, after this
change, you run:

  guix system shepherd-graph /tmp/config.scm| xdot -

you can see that the ‘swap-/dev/mapper/guix-swap’ service depends on
‘device-mapping-guix-swap’.

HTH!

Ludo’.