GNU bug report logs - #77402
31.0.50; Tramp: file-writable-p broken

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Subject: bug#77402: closed (Re: bug#77402: 31.0.50; Tramp: file-writable-p
 broken)
Date: Tue, 01 Apr 2025 13:58:15 +0000

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Your bug report

#77402: 31.0.50; Tramp: file-writable-p broken

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 77402 <at> debbugs.gnu.org.

-- 
77402: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=77402
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 77402-done <at> debbugs.gnu.org
Subject: Re: bug#77402: 31.0.50; Tramp: file-writable-p broken
Date: Tue, 01 Apr 2025 15:57:12 +0200

Version: 30.2

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

Hi Gerd,

>> Thanks for the feedback. Since it is a very low-level change, I'll run
>> my regression tests first. If everything goes fine, I'll push.
>
> Fine with me, I'm not in a hurry. I'll just wait until the fix appears.

Done. I've extended the patch for the other Tramp backends. Pushed to
the emacs-30 branch, will appear in master after the next sync.

Closing the bug.

Best regards, Michael.

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Tramp: file-writable-p broken
Date: Mon, 31 Mar 2025 10:21:25 +0200

In current master, Magit over Tramp/ssh stopped working. The first thing
I noticed in the log with tramp-verbose == 6 is

  08:33:37.401799 tramp-get-remote-tmpdir (1) # File error: Directory /ssh:mini:/tmp not accessible

This is caused by file-writable-p returning nil for the remote /tmp dir;
/tmp is a symlink to private/tmp on macOS.

I could bisect this to

  b8104dadbf285d12c356d4cddd28ac3eaf05f263 is the first bad commit
  commit b8104dadbf285d12c356d4cddd28ac3eaf05f263 (HEAD)
  Author: Michael Albinus <michael.albinus <at> gmx.de>
  Date:   Sun Mar 16 14:17:38 2025 +0100
      Tramp: Handle symlinks to non-existing targets better

Before this change

  (tramp-autoload-file-name-handler 'file-writable-p "/ssh:mini:/tmp")
  => t

After the change, it returns nil.

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