[bug#36311] doc: Add subsection and note about environment variables.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hello,

swedebugia <swedebugia@riseup.net> writes:

> -- 
> Cheers Swedebugia
>
>>From f7507682af3b4072596e36321b5ec240e7ab3a10 Mon Sep 17 00:00:00 2001
> From: swedebugia <swedebugia@riseup.net>
> Date: Thu, 20 Jun 2019 18:02:16 +0200
> Subject: [PATCH] doc: Add subsection and note about environment variables.
>
> * doc/guix.texi (Binary Installation and Application Setup): Clarify the
>   importance of correct environment variables.

[...]

> +@subsection Importance of environment variables
> +@cindex environment variables
> +Environment variables in the correct place are essential to the correct
> +operation of guix in a foreign system.
> +
> +Following the installation we recommend putting all environment variables into
> + @file{~.bash_profile} to make sure they are only executed when your login to
> + a shell (ie. open up a virtual terminal).
> +
> +If you use bash and put them into @file{.bashrc} you will end up with errors
> +because this file is executed by bash EVERY time a new environment is entered
> +(e.g. when entering a pure environment with @command{guix environment guix
> +--pure} and contaminate the environment).

I think this is maybe no longer as necessary, since we now have 'guix
shell --check' that will produce this kind of recommendation?

-- 
Thanks,
Maxim