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profiles: Preserve Bash ‘HIST’ variables.

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This reduces the risk that, when using Bash, ‘guix shell --pure’ would
spawn an instance of Bash that would ignore the user’s history-related
settings.

It is not bulletproof though: these variables as shell variables that
need not be exported as environment variable.  When they are not
exported, the user’s history-related settings would still be ignored.

* guix/profiles.scm (%precious-variables): Add HIST variables from Bash.

Change-Id: Id2898d67d2e70c083abbeacad3f0663940fb6789
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Ludovic Courtès 2025-07-17 17:33:21 +02:00
parent a65c691b39
commit e778155f51
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guix/profiles.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013-2024 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013-2025 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2014, 2016 Alex Kost <alezost@gmail.com>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
@ -2136,7 +2136,14 @@ already effective."
(define %precious-variables
;; Environment variables in the default 'load-profile' white list.
'("HOME" "USER" "LOGNAME" "DISPLAY" "XAUTHORITY" "TERM" "TZ" "PAGER"))
'("HOME" "USER" "LOGNAME" "DISPLAY" "XAUTHORITY" "TERM" "TZ" "PAGER"
;; These Bash variables (which can also be environment variables) must be
;; preserved. Failure to preserve 'HISTSIZE', for instance, would lead
;; Bash to use its default history size of 500 entries, possibly
;; truncating the user's ~/.bash_history.
"HISTCONTROL" "HISTFILE" "HISTFILESIZE" "HISTIGNORE"
"HISTSIZE" "HISTTIMEFORMAT"))
(define (purify-environment white-list white-list-regexps)
"Unset all environment variables except those that match the regexps in