ui: 'display-hint' quotes extra arguments for Texinfo.

Fixes <https://issues.guix.gnu.org/61201>.

Previously, common practice was to splice arbitrary strings (user names,
file names, etc.) into Texinfo snippets passed to 'display-hint'.  This
is unsafe in the general case because at signs and braces need to be
escaped to produced valid Texinfo.  This commit addresses that.

* guix/ui.scm (texinfo-quote): New procedure.
(display-hint): When ARGUMENTS is non-empty, pass it to 'texinfo-quote'
and call 'format'.
(report-unbound-variable-error, check-module-matches-file)
(display-collision-resolution-hint, run-guix-command): Remove explicit
'format' call; pass 'format' arguments as extra arguments to 'display-hint'.
* gnu/services/monitoring.scm (zabbix-front-end-config): Likewise.
* guix/scripts.scm (warn-about-disk-space): Likewise.
* guix/scripts/build.scm (%standard-cross-build-options)
(%standard-native-build-options): Likewise.
* guix/scripts/describe.scm (display-checkout-info): Likewise.
* guix/scripts/environment.scm (suggest-command-name): Likewise.
* guix/scripts/home.scm (process-command): Likewise.
* guix/scripts/home/edit.scm (service-type-not-found): Likewise.
* guix/scripts/import.scm (guix-import): Likewise.
* guix/scripts/package.scm (display-search-path-hint): Likewise.
* guix/scripts/pull.scm (build-and-install): Likewise.
* guix/scripts/shell.scm (auto-detect-manifest): Likewise.
* guix/scripts/system.scm (check-file-system-availability): Likewise.
(guix-system): Likewise.
* guix/scripts/system/edit.scm (service-type-not-found): Likewise.
* guix/status.scm (print-build-event): Likewise.

1 files changed, 5 insertions, 5 deletions

diff --git a/guix/scripts/shell.scm b/guix/scripts/shell.scm
index 64b5c2e8e9..92bbfb04d0 100644
--- a/guix/scripts/shell.scm
+++ b/guix/scripts/shell.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2021-2022 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2021-2023 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -305,16 +305,16 @@ Return the modified OPTS."
                (report-error
                 (G_ "not loading '~a' because not authorized to do so~%")
                 file)
-               (display-hint (format #f (G_ "To allow automatic loading of
+               (display-hint (G_ "To allow automatic loading of
 @file{~a} when running @command{guix shell}, you must explicitly authorize its
 directory, like so:
 
 @example
 echo ~a >> ~a
 @end example\n")
-                                     file
-                                     (dirname file)
-                                     (authorized-directory-file)))
+                             file
+                             (dirname file)
+                             (authorized-directory-file))
                (exit 1)))))))