bug#59684: 29.0.50; [PATCH] package.el: Insert news for installed packages only

[Andrii Kolomoiets <andreyk.mad@gmail.com>]

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Hi,

In some folder, e.g. "/tmp":
1. Create folder named "news"
2. emacs -Q
3. M-x list-packages
4. RET on any available not installed package

This will produce "Read error: Is a directory, /tmp/news" message.

In GNU Emacs 29.0.50
Repository revision: 2772ebe3667f28cefd0d6134204ce6a3c7a8c323
Repository branch: master

Adding news to package description was introuced in
dd98fedd0c7f27bfba046d761042c19181cb461d

Adding Philip to Cc as the author of the original commit.

Attached patch solves issue by checking that:
1. pkg-dir is not nil
2. pkg-dir is not 'builtin
3. "news" is a regular file


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From 9bd185609643ec861b02b4327295bb6db3b82974 Mon Sep 17 00:00:00 2001
From: muffinmad <andreyk.mad@gmail.com>
Date: Mon, 28 Nov 2022 23:09:59 +0200
Subject: [PATCH] Insert news for installed packages only

* lisp/emacs-lisp/package.el (describe-package-1): Check package is
installed and "news" is a regular file.
---
 lisp/emacs-lisp/package.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index 8d44fae30a0..f722eb8fae9 100644
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -2696,8 +2696,10 @@ describe-package-1
          (signed (if desc (package-desc-signed desc)))
          (maintainer (cdr (assoc :maintainer extras)))
          (authors (cdr (assoc :authors extras)))
-         (news (and-let* ((file (expand-file-name "news" pkg-dir))
-                          ((file-readable-p file)))
+         (news (and-let* (pkg-dir
+                          ((not built-in))
+                          (file (expand-file-name "news" pkg-dir))
+                          ((file-regular-p file)))
                  file)))
     (when (string= status "avail-obso")
       (setq status "available obsolete"))
-- 
2.32.1 (Apple Git-133)