doc: Explain how to exit and clean up a Guix environment.

* doc/guix.texi (Invoking guix environment): Explain how to exit and clean up
a Guix environment.

The current documentation doesn't explain how to exit an environment or how to
remove the packages after exiting.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>
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Lee 2021-02-12 16:44:56 -05:00 committed by Nicolas Goaziou
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@ -5558,6 +5558,12 @@ they should be defined in @file{.bash_profile}, which is sourced only by
log-in shells. @xref{Bash Startup Files,,, bash, The GNU Bash Reference
Manual}, for details on Bash start-up files.}.
Exiting from a Guix environment is the same as exiting from the shell,
and will place the user back in the old environment before @command{guix
environment} was invoked. The next garbage collection (@pxref{Invoking
guix gc}) will clean up packages that were installed from within the
environment and are no longer used outside of it.
@vindex GUIX_ENVIRONMENT
@command{guix environment} defines the @env{GUIX_ENVIRONMENT}
variable in the shell it spawns; its value is the file name of the