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

[Maxime Devos]

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.

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