Subject: [bug#50982] [PATCH] scripts: home/system: Don’t throw an error if no generations exist.

From: Ludovic Courtès <[email-masked]>
Date: Tue, 19 Oct 2021 15:59:08 +0200

Hi Xinglu,

Did you have a chance to look into this?

TIA!

Ludo’.

Maxime Devos <[email-masked]> skribis:

> Xinglu Chen schreef op za 02-10-2021 om 23:05 [+0200]:
>> Previously, When running ‘guix home describe’ or ‘guix system describe’ prior
>> to having any generations, a backtrace would produced.  Since not having any
>> existing generations is not an error, a warning would be enough.
>> 
>>   $ guix system describe
>>   guix system: warning: no system generation, nothing to describe
>
> Printing a warning instead of an error to avoid a backrace isn't necessary.
> E.g., "guix show i-do-not-exists" prints an error
> ‘guix show: error: i-do-not-exist: package not found’.
>
> I suggest using (leave (G_ "bla bla")) instead of (error (G_ "bla bla"))
> for these kind of errors, it appears to work '%find-package' in (gnu packages).
>
> I don't know if the output of "guix system describe" and "guix home describe"
> should be an error or warning here ...
>
> Greetings,
> Maxime.