Re: unbound variable in attempt to install "lightdm"

[Mario Forzanini <mf@marioforzanini.com>]

On 5/12/23 5:05 PM, Gottfried wrote:
> Hi,
> 
> I managed to update my packages in my default profile without updating 
> "caja-extensions"
> 
> So now I would like to install "lightdm"
> ----------------------------------------------------------------
> I added one line in my config.scm:
> 
>   (services
>      (append
>        (list (service mate-desktop-service-type)
>              (service enlightenment-desktop-service-type)
>              (service xfce-desktop-service-type)
>              (service lightdm-service-type)
>                          (service cups-service-type
>                                  (cups-configuration
>                                          (web-interface? #t)
>                                          (extensions (list cups-filters 
> hplip))))
>                          (service openssh-service-type)
>              (service tor-service-type)
>              (set-xorg-configuration
>                (xorg-configuration
>                 (keyboard-layout keyboard-layout)))
> 
> ------------------------------------------------------------------
> 
> running sudo guix system configure.. it gives me those messages:
> 
> 
> gfp@Tuxedo ~$  sudo guix system reconfigure /etc/config.scm
> Passwort:
> Backtrace:
>            18 (primitive-load "/home/gfp/.config/guix/current/bin/guix")
> In guix/ui.scm:
>     2300:7 17 (run-guix . _)
>    2263:10 16 (run-guix-command _ . _)
> In ice-9/boot-9.scm:
>    1752:10 15 (with-exception-handler _ _ #:unwind? _ # _)
> In guix/status.scm:
>      859:3 14 (_)
>      839:4 13 (call-with-status-report _ _)
> In guix/scripts/system.scm:
>     1277:4 12 (_)
> In ice-9/boot-9.scm:
>    1752:10 11 (with-exception-handler _ _ #:unwind? _ # _)
> In guix/store.scm:
>     659:37 10 (thunk)
>     1298:8  9 (call-with-build-handler #<procedure 7f853cc40a50 at g…> …)
>    2168:25  8 (run-with-store #<store-connection 256.99 7f8559435230> …)
> In guix/scripts/system.scm:
>      843:2  7 (_ _)
>      717:8  6 (_ #<store-connection 256.99 7f8559435230>)
> In gnu/system.scm:
>    1298:19  5 (operating-system-derivation _)
>     835:11  4 (operating-system-services #<<operating-system> kernel:…>)
>     869:20  3 (services _)
> In /etc/config.scm:
>      30:21  2 (services #<<operating-system> kernel: #<package linux-…>)
> In ice-9/boot-9.scm:
>    1685:16  1 (raise-exception _ #:continuable? _)
>    1685:16  0 (raise-exception _ #:continuable? _)
> 
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> Fehler: lightdm-service-type: Nicht gebundene Variable
> gfp@Tuxedo ~$ JavaScript error: 
> resource://gre/modules/LoginManagerChild.jsm, line 250: 
> NS_ERROR_FAILURE: Component returned failure code: 0x80004005 
> (NS_ERROR_FAILURE) [nsIAutoCompleteInput.popup]
> ----------------------------------------------------------------------------
> 
> it seems that I need to add something in my config.scm concerning lightdm.
> 
> Unfortunately I don’t know what to add.

At the beginning of the file there should be a list of imported modules, 
you should add something like

<snip>
(use-modules (gnu services lightdm))
<snap>

Which is the Guile module in which the symbol `lightdm-service-type' is 
defined, without that Guile won't know how to relate that symbol to any 
meaningful value.

If you want to find where a service is defined you could use the emacs 
interface for Guix: typing 'M-x guix RET s a' gives you a list of 
clickable service names, when you click on one of them useful info pops 
up. There's probably a way to do it with the command-line interface, but 
I'm not familiar with that.

I hope this helps :)
-- 
Mario