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bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display
From: |
Lars Ingebrigtsen |
Subject: |
bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display |
Date: |
Tue, 24 Aug 2021 17:40:28 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
"Michalis V." <mvar.40k@gmail.com> writes:
> I can reproduce this in 27.1 but in 28.0.50 i get the following message:
>
> Doing chmod: Operation not supported, /tmp/foobar
>
> chmod on the symlinked file itself works ("Redisplaying..." too)
>
> perhaps this functionality was disabled/removed for symlinks on purpose?
> or is it a new bug?
In Linux you can't change the permissions on a symlink (they're always
777):
chmod never changes the permissions of symbolic links; the chmod system
call cannot change their permissions. This is not a problem since the
permissions of symbolic links are never used.
So I'm surprised that the `M' command even tries to do the chmod on the
symlink. This was apparently done as part of a security audit:
commit 9d626dffc6ba62c0d7a1a5c712f576ed8684fd66
Author: Paul Eggert <eggert@cs.ucla.edu>
AuthorDate: Sun Feb 23 16:19:42 2020 -0800
Add 'nofollow' flag to set-file-modes etc.
This avoids some race conditions (Bug#39683). E.g., if some other
program changes a file to a symlink between the time Emacs creates
the file and the time it changes the file’s permissions, using the
new flag prevents Emacs from inadvertently changing the
permissions of a victim in some completely unrelated directory.
Hm. I'm not sure why this should affect the `M' command in dired, though...
I've added Paul to the CCs; perhaps he has some comments.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Michalis V., 2021/08/24
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display,
Lars Ingebrigtsen <=
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Paul Eggert, 2021/08/24
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Richard Stallman, 2021/08/25
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Lars Ingebrigtsen, 2021/08/26
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Andreas Schwab, 2021/08/26
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Paul Eggert, 2021/08/26
- bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Richard Stallman, 2021/08/26
bug#11912: 24.1; 'M' in Dired on a symlink does not refresh the display, Michalis V., 2021/08/25