[bug#39501] [PATCH] doc: Clarify how sudo and guix interact when updating

[Marius Bakke <mbakke@fastmail.com>]

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Jakub Kądziołka <kuba@kadziolka.net> writes:

> * doc/guix.texi (After System Installation): Explicitly explain the
>   mechanics of how sudo differs from a login shell.
>
> Some recent discussions on IRC suggest that the existing wording wasn't
> entirely clear.
> ---
>  doc/guix.texi | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/doc/guix.texi b/doc/guix.texi
> index 710cf97673..9f758706f6 100644
> --- a/doc/guix.texi
> +++ b/doc/guix.texi
> @@ -72,6 +72,7 @@ Copyright @copyright{} 2019 Guillaume Le Vaillant@*
>  Copyright @copyright{} 2020 Leo Prikler@*
>  Copyright @copyright{} 2019, 2020 Simon Tournier@*
>  Copyright @copyright{} 2020 Wiktor Żelazny@*
> +Copyright @copyright{} 2020 Jakub Kądziołka@*
>  
>  Permission is granted to copy, distribute and/or modify this document
>  under the terms of the GNU Free Documentation License, Version 1.3 or
> @@ -2439,6 +2440,11 @@ your system includes the latest security updates (@pxref{Security Updates}).
>  Note that @command{sudo guix} runs your user's @command{guix} command and
>  @emph{not} root's, because @command{sudo} leaves @code{PATH} unchanged.  To
>  explicitly run root's @command{guix}, type @command{sudo -i guix @dots{}}.
> +
> +The difference matters here, because @command{guix pull} updates
> +the @command{guix} command and package definitions only for the user it is ran
> +as. This means that if you choose to use @command{guix system reconfigure} in
     ^^^
Please use two spaces after punctuations.  Otherwise LGTM.

> +root's login shell, you'll need to @command{guix pull} separately.
>  @end quotation

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