doc: Clarify how sudo and guix interact when updating

* 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.
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Jakub Kądziołka 2020-02-07 22:47:10 +01:00
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@ -73,6 +73,7 @@ Copyright @copyright{} 2020 Leo Prikler@*
Copyright @copyright{} 2019, 2020 Simon Tournier@*
Copyright @copyright{} 2020 Wiktor Żelazny@*
Copyright @copyright{} 2020 Damien Cassou@*
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
@ -2440,6 +2441,11 @@ 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
root's login shell, you'll need to @command{guix pull} separately.
@end quotation
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