Subject: Re: bug#60365: [PATCH 0/4] Rationalize 'PS1' handling in home, system, and shell

From: Andrew Tropin <[email-masked]>
Date: Wed, 04 Jan 2023 10:00:18 +0400

On 2023-01-03 23:46, Ludovic Courtès wrote:

> Hi Andrew!
>
> Andrew Tropin <[email-masked]> skribis:
>
>>> I found some things could be improved in how we deal with ‘PS1’ in
>>> Guix Home, Guix System, and ‘guix shell’ (my initial motivation was
>>> making it easy to change ‘PS1’ from a Home configuration).
>>>
>>> These patches fiddle with ‘PS1’.  The most visible effect is that
>>> Guix Home’s ~/.bashrc will no longer provide a default ‘PS1’.
>>>
>>> Thoughts?
>>
>> Factorization of bashrc is great!
>>
>> Not sure about moving PS1 to /etc/bashrc as it won't work on foreign
>> distros and guix environment won't be noticable in the prompt.  Warning
>> is useful, but I would expect prompt work OOB, when guix-defualts? is
>> #t.
>
> Yes, you’re right.
>
>> The possible alternative solution is to factorize bash_profile and put
>> PS1 here, so both skeleton and home provided bashrc have it, after that
>> setting PS1 with environment-variables field will start working.
>
> How about this:
>
> diff --git a/gnu/home/services/shells.scm b/gnu/home/services/shells.scm
> index d7dd579293..8d7db6b774 100644
> --- a/gnu/home/services/shells.scm
> +++ b/gnu/home/services/shells.scm
> @@ -407,6 +407,9 @@ (define* (file-if-not-empty field #:optional (extra-content #f))
>  # Honor per-interactive-shell startup file
>  if [ -f ~/.bashrc ]; then source ~/.bashrc; fi
>  "
> +        (if (home-bash-configuration-guix-defaults? config)
> +            "export PS1=...\n"

Yep, something like that should work.  Ideally, is to make
%default-bash-profile or even more generic %default-profile and reuse it
across system and home, but it may be not that trivial, so we can
postpone it for now.

> +            "")
>          (serialize-field 'bash-profile)
>          (serialize-field 'environment-variables)))
>  
>
> That way, if one adds ‘PS1’ to ‘environment-variables’, that will
> override the default.
>
> WDYT?
>
> Thanks for your feedback!
>
> Ludo’.

-- 
Best regards,
Andrew Tropin