GNU bug report logs - #78800
30.1; dired-re-perms is valid only with modes in ls-lisp-verbosity

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Johan Claesson <johanwclaesson <at> bahnhof.se>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.1; dired-re-perms is valid only with modes in ls-lisp-verbosity
Date: Sun, 15 Jun 2025 15:34:28 +0200

Hi,

I am writing about a very small corner case problem in dired in Emacs.
Since 83e0442 when modes is not a member of ls-lisp-verbosity then
ls-lisp will print the permissions in short form like "drwx".  This will
not match the dired-re-perms regexp which expect like "drwxrwxrwx". This
will cause a problem in dired for filenames that ends with a colon (:).
To reproduce from emacs -Q:

(require 'ls-lisp)
(setq ls-lisp-use-insert-directory-program nil
      ls-lisp-verbosity '(links uid))

And then visit a directory containing a file ending with a colon.  
Maybe the dired-re-perms could just be shortened/simplified to cover
this case as well?

Regards,

/Johan



In GNU Emacs 30.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33,
 cairo version 1.16.0) of 2025-05-31 built on goblin
Repository revision: 8ac894e2246f25d2a2a97d866b10e6e0b0fede5a
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.5 LTS

Configured using:
 'configure --with-x-toolkit=gtk3 --without-compress-install
 --with-modules PKG_CONFIG_PATH=/home/jcl/usr/lib/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Term

Minor modes in effect:
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Load-path shadows:
/home/jcl/elpa/magit-4.3.5/magit-autorevert hides /home/jcl/elpa/magit-section-4.3.5/magit-autorevert
/home/jcl/elpa/magit-4.3.5/magit-dired hides /home/jcl/elpa/magit-section-4.3.5/magit-dired
/home/jcl/elpa/transient-0.8.8/transient hides /home/jcl/build/emacs-stable/lisp/transient

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Memory information:
((conses 16 1444353 241767) (symbols 48 94949 1)
 (strings 32 398474 19995) (string-bytes 1 12139873)
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Message #8 received at 78800 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: johanwclaesson <at> gmail.com, Sam Steingold <sds <at> gnu.org>
Cc: 78800 <at> debbugs.gnu.org
Subject: Re: bug#78800: 30.1;
 dired-re-perms is valid only with modes in ls-lisp-verbosity
Date: Mon, 16 Jun 2025 12:36:39 +0300

> From: Johan Claesson <johanwclaesson <at> bahnhof.se>
> Date: Sun, 15 Jun 2025 15:34:28 +0200
> 
> I am writing about a very small corner case problem in dired in Emacs.
> Since 83e0442 when modes is not a member of ls-lisp-verbosity then
> ls-lisp will print the permissions in short form like "drwx".  This will
> not match the dired-re-perms regexp which expect like "drwxrwxrwx". This
> will cause a problem in dired for filenames that ends with a colon (:).
> To reproduce from emacs -Q:
> 
> (require 'ls-lisp)
> (setq ls-lisp-use-insert-directory-program nil
>       ls-lisp-verbosity '(links uid))
> 
> And then visit a directory containing a file ending with a colon.  
> Maybe the dired-re-perms could just be shortened/simplified to cover
> this case as well?

It is not easy to modify the value of dired-re-perms, because it is
also used in dired-font-lock-keywords, whose value is set when
dired.el is first loaded.

I must say that the feature introduced by 83e0442 is problematic, when
used on Posix systems that could have files with names ending in a
colon.  For that reason, I don't recommend using it on Posix systems.
Why are you using it?

Adding Sam to the discussion, who added that feature, in case he could
have comments or suggestions.

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