Re: Errors in modules are suppressed?

[Daniel Schäfer]

The manual says in 14.4 Packaging Guidelines:

> If the package is unknown to the guix command, it may be that the 
source file
> contains a syntax error, or lacks a define-public clause to export 
the package
> variable. To figure it out, you may load the module from Guile to get 
more
> information about the actual error:
>
> ./pre-inst-env guile -c '(use-modules (gnu packages gnew))'

Is something like that possible for reconfiguring the system?

Thanks,
Daniel

On 10/14/19 12:50 AM, Daniel Schäfer wrote:
> Hi all,
>
> I'm using modules to split up my system configuration in multiple 
> files (not sure whether that's the right approach).
> However, when a used module contains an error, `guix system` does not 
> provide a helpful error message, it just says:
>
>   $ sudo guix system build config.scm
>   ice-9/eval.scm:223:20: In procedure proc:
>   error: bar: unbound variable
>   hint: Did you forget `(use-modules (foo))'?
>
> when I try to use `bar` in my original file.
>
> For a minimal working example, change your system's configuration file 
> like this:
>
> +(add-to-load-path ".")
> -(use-modules (gnu))
> +(use-modules (gnu)
> +             (foo))
>  (use-service-modules desktop networking ssh xorg)
>
>  (operating-system
> -  (locale "en_US.utf8")
> +  (locale bar)
>
>
> And add the new module foo.scm, which contains an error by design:
>
> (define-module (foo)
>  #:export (bar))
>
> (this is not defined)
> (define bar "en_US.utf8")
>
>
> I'd be glad to hear about any tips to get the proper error message.
>
> Thanks,
> Daniel