GNU bug report logs - #78572
30.1; Tramp Project error message loop - File is missing

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

From: Alexis Bakatine <abakatine <at> proton.me>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 30.1; Tramp Project error message loop - File is missing
Date: Fri, 23 May 2025 16:06:23 +0000

When using either one of these settings, or both at the same time:

(setopt project-vc-extra-root-markers '(".project"))
(setopt project-mode-line t)

Tramp produces error messages in the minibuffer after connecting
to the remote server:

File is missing: /sudo:root <at> x:/root/
File is missing: /sudo:root <at> x:/

It only happens when using Tramp with:
/ssh:x|sudo::

If I'm using the command below, the problem doesn't occur (note that "x" is simply a
host server config name in my ~/.ssh/config file):
/ssh:x:

What's worse is that it loops over and over trying to search for some
file that it cannot find remotely, and after a few minutes connected
Emacs becomes unresponsive.

Here is an excerpt of the debug backtrace:
*debug tramp/sudo root <at> x*
05:37:50.799367 tramp-file-name-handler (10) #
  backtrace()
  tramp-file-name-handler(file-directory-p "/sudo:root <at> x:/")
  file-directory-p("/sudo:root <at> x:/")
  tramp-handle-directory-files("/sudo:root <at> x:/" nil "\\`\\(\\`\\.git\\'\\)\\|\\(\\`\\.project\\'\\)\\'" t nil)
  tramp-sh-file-name-handler(directory-files "/sudo:root <at> x:/" nil "\\`\\(\\`\\.git\\'\\)\\|\\(\\`\\.project\\'\\)\\'" t nil)
  apply(tramp-sh-file-name-handler directory-files ("/sudo:root <at> x:/" nil "\\`\\(\\`\\.git\\'\\)\\|\\(\\`\\.project\\'\\)\\'" t nil))
  tramp-file-name-handler(directory-files "/sudo:root <at> x:/" nil "\\`\\(\\`\\.git\\'\\)\\|\\(\\`\\.project\\'\\)\\'" t nil)
  directory-files("/sudo:root <at> x:/" nil "\\`\\(\\`\\.git\\'\\)\\|\\(\\`\\.project\\'\\)\\'" t)
  #f(compiled-function (d) #<bytecode 0x1acb9e5dc5281a7c>)("/sudo:root <at> x:/")
  locate-dominating-file("/sudo:root <at> x:/root/" #f(compiled-function (d) #<bytecode 0x1acb9e5dc5281a7c>))
  project-try-vc--search("/sudo:root <at> x:/root/")
  project-try-vc("/sudo:root <at> x:/root/")
  run-hook-with-args-until-success(project-try-vc "/sudo:root <at> x:/root/")
  project--find-in-directory("/sudo:root <at> x:/root/")
  project-current(nil)

I tested this on Emacs 30.1 on Linux, macOS and Windows, with the same
results.

ps: sorry for the poor formatting.

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Alexis Bakatine via "Bug reports for GNU Emacs, the Swiss army knife of
 text editors" <bug-gnu-emacs <at> gnu.org>
Cc: Alexis Bakatine <abakatine <at> proton.me>, 78572 <at> debbugs.gnu.org
Subject: Re: bug#78572: 30.1; Tramp Project error message loop - File is
 missing
Date: Sat, 24 May 2025 13:31:05 +0200

Alexis Bakatine via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs <at> gnu.org> writes:

Hi Alexis,

> When using either one of these settings, or both at the same time:
>
> (setopt project-vc-extra-root-markers '(".project"))
> (setopt project-mode-line t)
>
> Tramp produces error messages in the minibuffer after connecting
> to the remote server:
>
> File is missing: /sudo:root <at> x:/root/
> File is missing: /sudo:root <at> x:/
>
> It only happens when using Tramp with:
> /ssh:x|sudo::
>
> If I'm using the command below, the problem doesn't occur (note that "x" is simply a
> host server config name in my ~/.ssh/config file):
> /ssh:x:
>
> What's worse is that it loops over and over trying to search for some
> file that it cannot find remotely, and after a few minutes connected
> Emacs becomes unresponsive.

Well, I've tried to reproduce it. Using Emacs 30, I've called

--8<---------------cut here---------------start------------->8---
# emacs -Q-l project --eval '(setopt project-vc-extra-root-markers (quote (".project")))' --eval '(setopt project-mode-line t)' --eval '(setq tramp-verbose 10)' '/ssh:ubuntu-2404|sudo::'
--8<---------------cut here---------------end--------------->8---

Note that I'm not using project.el. Could you please provide a
step-by-step recipe for reproducing the problem?

> I tested this on Emacs 30.1 on Linux, macOS and Windows, with the same
> results.

Best regards, Michael.

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