GNU bug report logs - #79173
30.1; TRAMP simplified syntax produces empty completing-read candidates

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

From: Reuben Thomas <rrt <at> sc3d.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.1; TRAMP simplified syntax produces empty completing-read
 candidates
Date: Mon, 04 Aug 2025 23:55:02 +0100

I’m a bit unsure how to demonstrate this bug in vanilla Emacs. See
https://github.com/minad/vertico/discussions/623 for the original
context in which I found this problem, using the vertico package. The
author assures me this is an Emacs bug, and gives his reasoning there.

Also, according to him it is possible that it has already been fixed on
master.

The problem is that when `tramp-syntax` is set to `simplified`, then
`find-file` can produce an empty completion for `completing-read`. (The
vertico author’s suggestion is that empty completions are invalid.)

Emacs then tries to add a text property to a one-character span of this
empty completion candidate, which of course does not work.

I give steps to reproduce in the bug report above, but they require the
use of vertico, which is obviously not ideal, apologies. It seems that
in vanilla Emacs the bug does not have obvious consequences.

I can confirm at least that the bug also manifests when the user has no
`.ssh/config` file.

In GNU Emacs 30.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41,
 cairo version 1.18.0) of 2025-02-25, modified by Debian built on
 lcy02-amd64-066
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Ubuntu 24.04.2 LTS

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/30.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/30.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/libexec --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/30.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/30.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-cairo
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 -fdebug-prefix-map=/build/emacs-XzQpMq/emacs-30.1=/usr/src/emacs-1:30.1-0build1~ubuntu2404
 -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=3'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
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Important settings:
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Major mode: Markdown

Minor modes in effect:
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  ctrlf-mode: t
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  auto-composition-mode: t
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Load-path shadows:
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig-core hides /usr/share/emacs/30.1/lisp/editorconfig-core
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig-conf-mode hides /usr/share/emacs/30.1/lisp/editorconfig-conf-mode
/home/rrt/.emacs.d/elpa/transient-0.9.4/transient hides /usr/share/emacs/30.1/lisp/transient
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig-fnmatch hides /usr/share/emacs/30.1/lisp/editorconfig-fnmatch
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig hides /usr/share/emacs/30.1/lisp/editorconfig
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig-tools hides /usr/share/emacs/30.1/lisp/editorconfig-tools
/home/rrt/.emacs.d/elpa/editorconfig-20250219.1528/editorconfig-core-handle hides /usr/share/emacs/30.1/lisp/editorconfig-core-handle
/home/rrt/.emacs.d/elpa/python-0.30/python hides /usr/share/emacs/30.1/lisp/progmodes/python
/home/rrt/.emacs.d/elpa/dictionary-20201001.1727/dictionary hides /usr/share/emacs/30.1/lisp/net/dictionary

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Memory information:
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-- 
https://rrt.sc3d.org

Message #8 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: 79173 <at> debbugs.gnu.org
Cc: Reuben Thomas <rrt <at> sc3d.org>
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Tue, 05 Aug 2025 10:14:00 +0200

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

Hi Reuben,

> I’m a bit unsure how to demonstrate this bug in vanilla Emacs. See
> https://github.com/minad/vertico/discussions/623 for the original
> context in which I found this problem, using the vertico package. The
> author assures me this is an Emacs bug, and gives his reasoning there.

Thanks for the bug report. Yes, I could reproduce the problem according
to your recipe with Emacs 30. I'm using a recent build from the emacs-30
branch:

--8<---------------cut here---------------start------------->8---
GNU Emacs 31.0.50 (build 13, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.2) of 2025-07-22
--8<---------------cut here---------------end--------------->8---

> Also, according to him it is possible that it has already been fixed on
> master.

I've modified your recipe slightly in my next test. In package-isolate,
I've said vertico-2.4,tramp-2.8.0.1 :

--8<---------------cut here---------------start------------->8---
;; - compat-30.1.0.0 (dependency)
;; - seq-2.24 (dependency)
;; - tramp-2.8.0.1
;; - vertico-2.4
--8<---------------cut here---------------end--------------->8---

Tramp 2.8 is the version in Emacs' master branch. The same problem
appeared.

Now a third test, like the first one but using Emacs 31 from the master
branch. No error happens.

Conclusion: the problem is fixed im Emacs' master branch. Unfortunately,
this fix is not in Tramp itself, so it doesn't suffices to use a recent
Tramp version from ELPA.

So I propose to close your bug. This is unfortune for people using Emacs
30, but I don't know what and how to backport.

Best regards, Michael.

Message #11 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: 79173 <at> debbugs.gnu.org
Cc: Reuben Thomas <rrt <at> sc3d.org>
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Tue, 05 Aug 2025 10:25:11 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Conclusion: the problem is fixed im Emacs' master branch. Unfortunately,
> this fix is not in Tramp itself, so it doesn't suffices to use a recent
> Tramp version from ELPA.

NB: This problem is not related to vertico. A simple recipe:

--8<---------------cut here---------------start------------->8---
emacs -Q -l tramp --eval "(tramp-change-syntax 'simplified)" --eval '(setq debug-on-error t)'
C-x C-f / TAB TAB
--8<---------------cut here---------------end--------------->8---

This shows the problem with Emacs 30. With Emacs 31, no problem.

> So I propose to close your bug. This is unfortune for people using Emacs
> 30, but I don't know what and how to backport.

Best regards, Michael.

Message #14 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Tue, 5 Aug 2025 11:57:09 +0100

[Message part 1 (text/plain, inline)]

On Tue, 5 Aug 2025 at 09:25, Michael Albinus <michael.albinus <at> gmx.de> wrote:

> Michael Albinus <michael.albinus <at> gmx.de> writes:
>
> > Conclusion: the problem is fixed im Emacs' master branch. Unfortunately,
> > this fix is not in Tramp itself, so it doesn't suffices to use a recent
> > Tramp version from ELPA.
>

Many thanks for the rapid confirmation diagnosis.

I have a question: presumably the latest version of TRAMP still generates
empty completion-read candidates. I think the question still needs
answering: is this valid? If not, then whatever has changed in Emacs 31 is
just masking a bug that still exists in TRAMP.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #17 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Tue, 05 Aug 2025 14:21:14 +0200

[Message part 1 (text/plain, inline)]

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> I have a question: presumably the latest version of TRAMP still
> generates empty completion-read candidates. I think the question still
> needs answering: is this valid? If not, then whatever has changed in
> Emacs 31 is just masking a bug that still exists in TRAMP.

Good point. Could you pls check the appended patch? Since this touches a
macro, you must recompile first tramp.el, and afterwards tramp-sh.el.

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #22 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Tue, 5 Aug 2025 22:39:51 +0100

[Message part 1 (text/plain, inline)]

On Tue, 5 Aug 2025 at 13:21, Michael Albinus <michael.albinus <at> gmx.de> wrote:

>
> Good point. Could you pls check the appended patch? Since this touches a
> macro, you must recompile first tramp.el, and afterwards tramp-sh.el.
>

Thanks very much for the patch!

I installed this patch by first installing tramp 2.8.0.1 in Emacs 30.1 from
ELPA, then applying the patch, then starting Emacs and recompiling tramp.sh
and tramp-sh.el, then restarting Emacs.

This did not quite have the expected effect.

The error from vertico was gone, but when I type a single slash at the
find-file prompt, I now get prompted to log in to an SSH host. This sounds
as though two lists have gotten out of sync: one with the empty entry, and
one without. Do let me know if I can do further investigation.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #25 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Wed, 06 Aug 2025 09:30:46 +0200

[Message part 1 (text/plain, inline)]

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> I installed this patch by first installing tramp 2.8.0.1 in Emacs 30.1
> from ELPA, then applying the patch, then starting Emacs and
> recompiling tramp.sh and tramp-sh.el, then restarting Emacs.
>
> This did not quite have the expected effect.
>
> The error from vertico was gone, but when I type a single slash at the
> find-file prompt, I now get prompted to log in to an SSH host. This
> sounds as though two lists have gotten out of sync: one with the empty
> entry, and one without. Do let me know if I can do further
> investigation.

Same here with vertico. This now seems a vertico error. The backtrace is
as follows:

--8<---------------cut here---------------start------------->8---
  backtrace()
  tramp-error((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) file-error #("Tramp failed to connect.  If this happens repeatedly, try\n    ‘M-x tramp-cleanup-this-connection’" 63 96 (font-lock-face help-key-binding face help-key-binding)))
  apply(tramp-error (tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) file-error #("Tramp failed to connect.  If this happens repeatedly, try\n    ‘M-x tramp-cleanup-this-connection’" 63 96 (font-lock-face help-key-binding face help-key-binding)) nil)
  tramp-process-actions(#<process *tramp/scp infempbln01.int.infinit-services.com*> (tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) 1 ((tramp-login-prompt-regexp tramp-action-login) (tramp-password-prompt-regexp tramp-action-password) (tramp-otp-password-prompt-regexp tramp-action-otp-password) (tramp-fingerprint-prompt-regexp tramp-action-fingerprint) (tramp-wrong-passwd-regexp tramp-action-permission-denied) (shell-prompt-pattern tramp-action-succeed) (tramp-shell-prompt-pattern tramp-action-succeed) (tramp-yesno-prompt-regexp tramp-action-yesno) (tramp-yn-prompt-regexp tramp-action-yn) (tramp-terminal-prompt-regexp tramp-action-terminal) (tramp-antispoof-regexp tramp-action-confirm-message) (tramp-security-key-confirm-regexp tramp-action-show-and-confirm-message) (tramp-security-key-pin-regexp tramp-action-otp-password) (tramp-process-alive-regexp tramp-action-process-alive)) 60)
  tramp-maybe-open-connection((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil))
  tramp-send-command((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "echo ~ 2>/dev/null; echo tramp_exit_status $?")
  tramp-send-command-and-check((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "echo ~")
  tramp-sh-handle-get-home-directory((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "")
  tramp-sh-file-name-handler(tramp-get-home-directory (tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "")
  apply(tramp-sh-file-name-handler tramp-get-home-directory ((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) ""))
  tramp-file-name-handler(tramp-get-home-directory (tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "")
  tramp-get-home-directory((tramp-file-name #("scp" 0 3 (tramp-default t)) nil nil "infempbln01.int.infinit-services.com" nil "" nil) "")
  tramp-sh-handle-expand-file-name("/infempbln01.int.infinit-services.com:" nil)
  tramp-sh-file-name-handler(expand-file-name "/infempbln01.int.infinit-services.com:" nil)
  apply(tramp-sh-file-name-handler expand-file-name ("/infempbln01.int.infinit-services.com:" nil))
  tramp-file-name-handler(expand-file-name "/infempbln01.int.infinit-services.com:" nil)
  file-name-all-completions("" "/infempbln01.int.infinit-services.com:")
  completion-file-name-table("/infempbln01.int.infinit-services.com:" file-exists-p t)
  completion-pcm--all-completions("/infempbln01.int.infinit-services.com:" nil completion-file-name-table file-exists-p)
  completion-pcm--find-all-completions("/i-:" completion-file-name-table file-exists-p 4)
  completion-pcm-all-completions("/i-:" completion-file-name-table file-exists-p 4)
  #f(compiled-function (style) #<bytecode -0x851335bf00f499a>)(partial-completion)
  #f(compiled-function (elt) #<bytecode 0x114e79b73560d32b>)(partial-completion)
  mapc(#f(compiled-function (elt) #<bytecode 0x114e79b73560d32b>) (basic partial-completion emacs22))
  seq-do(#f(compiled-function (elt) #<bytecode 0x114e79b73560d32b>) (basic partial-completion emacs22))
  seq-some(#f(compiled-function (style) #<bytecode -0x851335bf00f499a>) (basic partial-completion emacs22))
  completion--nth-completion(2 "~/src/emacs-30//i-:" read-file-name-internal file-exists-p 19 (metadata (category . file) (completion--unquote-requote . t)))
  completion-all-completions("~/src/emacs-30//i-:" read-file-name-internal file-exists-p 19 (metadata (category . file) (completion--unquote-requote . t)))
  vertico--filter-completions("~/src/emacs-30//i-:" read-file-name-internal file-exists-p 19 (metadata (category . file) (completion--unquote-requote . t)))
  vertico--recompute(19 "~/src/emacs-30//i-:")
  vertico--update(interruptible)
  #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_13>()
  #f(compiled-function () #<bytecode 0x18c0b2df11f5>)()
  handler-bind-1(#f(compiled-function () #<bytecode 0x18c0b2df11f5>) (error) vertico--debug)
  vertico--protect(#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_13>)
  vertico--exhibit()
  #<subr completing-read-default>("Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/src/emacs-30/" file-name-history "~/src/emacs-30/" nil)
  apply((#<subr completing-read-default> "Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/src/emacs-30/" file-name-history "~/src/emacs-30/" nil))
  vertico--advice(#<subr completing-read-default> "Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/src/emacs-30/" file-name-history "~/src/emacs-30/" nil)
  apply(vertico--advice #<subr completing-read-default> ("Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/src/emacs-30/" file-name-history "~/src/emacs-30/" nil))
  completing-read-default("Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/src/emacs-30/" file-name-history "~/src/emacs-30/" nil)
  read-file-name-default("Find file: " nil "~/src/emacs-30/" confirm-after-completion nil nil)
  read-file-name("Find file: " nil "~/src/emacs-30/" confirm-after-completion)
  find-file-read-args("Find file: " confirm-after-completion)
  byte-code("\300\301\302 \"\207" [find-file-read-args "Find file: " confirm-nonexistent-file-or-buffer] 3)
  command-execute(find-file)
--8<---------------cut here---------------end--------------->8---

As we see, there is

--8<---------------cut here---------------start------------->8---
  completion-pcm--all-completions("/infempbln01.int.infinit-services.com:" nil completion-file-name-table file-exists-p)
  completion-pcm--find-all-completions("/i-:" completion-file-name-table file-exists-p 4)
  completion-pcm-all-completions("/i-:" completion-file-name-table file-exists-p 4)
...
  vertico--filter-completions("~/src/emacs-30//i-:" read-file-name-internal file-exists-p 19 (metadata (category . file) (completion--unquote-requote . t)))
--8<---------------cut here---------------end--------------->8---

This is OK, "infempbln01.int.infinit-services.com" is a valid completion
for "/i-:". However, vertico must not trigger to open that host. This
can be achieved by let-binding minibuffer-completing-file-name, for
example by the following patch in vertico.el:

[Message part 2 (text/x-patch, inline)]

*** /home/albinus/.emacs.d/elpa/vertico-2.4/vertico.el.~1~	2025-08-05 09:44:34.923858379 +0200
--- /home/albinus/.emacs.d/elpa/vertico-2.4/vertico.el	2025-08-06 09:21:14.376181020 +0200
***************
*** 211,217 ****
  
  (defun vertico--filter-completions (&rest args)
    "Compute all completions for ARGS with lazy highlighting."
!   (dlet ((completion-lazy-hilit t) (completion-lazy-hilit-fn nil))
      (static-if (>= emacs-major-version 30)
          (cons (apply #'completion-all-completions args) completion-lazy-hilit-fn)
        (cl-letf* ((orig-pcm (symbol-function #'completion-pcm--hilit-commonality))
--- 211,217 ----
  
  (defun vertico--filter-completions (&rest args)
    "Compute all completions for ARGS with lazy highlighting."
!   (dlet ((completion-lazy-hilit t) (completion-lazy-hilit-fn nil) (minibuffer-completing-file-name t))
      (static-if (>= emacs-major-version 30)
          (cons (apply #'completion-all-completions args) completion-lazy-hilit-fn)
        (cl-letf* ((orig-pcm (symbol-function #'completion-pcm--hilit-commonality))

[Message part 3 (text/plain, inline)]

Best regards, Michael.

Message #28 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Wed, 6 Aug 2025 18:21:14 +0100

[Message part 1 (text/plain, inline)]

On Wed, 6 Aug 2025 at 08:30, Michael Albinus <michael.albinus <at> gmx.de> wrote:

> Reuben Thomas <rrt <at> sc3d.org> writes:
>
> Same here with vertico. This now seems a vertico error[…]vertico must not
> trigger to open that host. This
> can be achieved by let-binding minibuffer-completing-file-name, for example
> by the following patch in vertico.el.


Many thanks for the analysis and patch. I have notified the vertico
maintainer.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #31 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Wed, 6 Aug 2025 19:02:32 +0100

[Message part 1 (text/plain, inline)]

On Wed, 6 Aug 2025 at 18:21, Reuben Thomas <rrt <at> sc3d.org> wrote:

>
> Many thanks for the analysis and patch. I have notified the vertico
> maintainer.
>

The vertico maintainer does not believe the patch for vertico is correct:
https://github.com/minad/vertico/discussions/623#discussioncomment-14023927

I just wanted to ensure that this doesn't affect the diagnosis of and the
patch to TRAMP.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #34 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 07 Aug 2025 09:36:33 +0200

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> The vertico maintainer does not believe the patch for vertico is
> correct:
> https://github.com/minad/vertico/discussions/623#discussioncomment-14023927
>
> I just wanted to ensure that this doesn't affect the diagnosis of and
> the patch to TRAMP.

I've pushed the Tramp patch to the repositories. Will be available with
Emacs 31. And it will be also be part of the next GNU ELPA release,
Tramp 2.8.0.2.

I've tried your scenario, again, with the recompiled Emacs 31. I cannot
reproduce the error any longer. Could you, pls, check?

Best regards, Michael.

Message #37 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 12:50:14 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 08:36, Michael Albinus <michael.albinus <at> gmx.de> wrote:

>
> I've pushed the Tramp patch to the repositories. Will be available with
> Emacs 31. And it will be also be part of the next GNU ELPA release,
> Tramp 2.8.0.2.
>
> I've tried your scenario, again, with the recompiled Emacs 31. I cannot
> reproduce the error any longer. Could you, pls, check?
>

I think there may be some confusion here. I am using Emacs 30, and have
never tested Emacs 31. I applied your patch to Tramp 2.8.0.1, and found the
different error, which you diagnosed as a vertico bug, in Emacs 30.

Since you say that with your TRAMP patch the problem ought not to arise in
Emacs 30, I was trying to understand whether the remaining problem is
indeed in vertico, or not (there may be some disagreement between you and
the vertico maintainer on this).

As to Emacs 31, it appears that other changes there may have concealed one
or more bugs, but since the fixes are in TRAMP and/or vertico, it doesn't
seem that there are any further implications for Emacs 31.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #40 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 07 Aug 2025 14:48:09 +0200

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> I think there may be some confusion here. I am using Emacs 30, and
> have never tested Emacs 31. I applied your patch to Tramp 2.8.0.1, and
> found the different error, which you diagnosed as a vertico bug, in
> Emacs 30.

After I've sent my message, I've realized that I should test with Emacs
30. So I did. I've transformed you recipe into the shell command

--8<---------------cut here---------------start------------->8---
# ~/src/emacs-30/src/emacs -Q -l ~/.emacs.d/elpa/compat-30.1.0.0/compat-autoloads.el -l ~/.emacs.d/elpa/seq-2.24/seq-autoloads.el -l ~/.emacs.d/elpa/vertico-2.4/vertico-autoloads.el -L /home/albinus/src/tramp/lisp -l tramp --eval "(tramp-change-syntax 'simplified)" -f vertico-mode
--8<---------------cut here---------------end--------------->8---

/home/albinus/src/tramp is the master branch of Tramp, including the
patch. This is what will be Tramp 2.8.0.2.

Typing 'C-x C-f /' works as expected.

Best regards, Michael.

Message #43 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 15:32:02 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 13:48, Michael Albinus <michael.albinus <at> gmx.de> wrote:

>
> After I've sent my message, I've realized that I should test with Emacs
> 30. So I did. I've transformed you recipe into the shell command
>
> --8<---------------cut here---------------start------------->8---
> # ~/src/emacs-30/src/emacs -Q -l
> ~/.emacs.d/elpa/compat-30.1.0.0/compat-autoloads.el -l
> ~/.emacs.d/elpa/seq-2.24/seq-autoloads.el -l
> ~/.emacs.d/elpa/vertico-2.4/vertico-autoloads.el -L
> /home/albinus/src/tramp/lisp -l tramp --eval "(tramp-change-syntax
> 'simplified)" -f vertico-mode
> --8<---------------cut here---------------end--------------->8---
>
> /home/albinus/src/tramp is the master branch of Tramp, including the
> patch. This is what will be Tramp 2.8.0.2.
>
> Typing 'C-x C-f /' works as expected.
>

Great, I can confirm this works for me too, also with my standard setup.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #48 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 07 Aug 2025 16:47:51 +0200

Version: 30.3

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> Great, I can confirm this works for me too, also with my standard
> setup.

Thanks for the feedback. So I'm closing this bug for "Emacs 30.3". I
don't know whether this release will happen, but the current release
under test, Emacs 30.2, won't get this patch.

Best regards, Michael.

Message #51 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 17:33:09 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 15:48, Michael Albinus <michael.albinus <at> gmx.de> wrote:

>
> > Great, I can confirm this works for me too, also with my standard
> > setup.
>

After some more testing, I can still reproduce the problem where with the
patched TRAMP 2.8.0.1, and using vertico 2.4, Emacs 30.1 tries to log into
a remote host when I type C-x C-f /

I have been unable to find the cause. On one machine, the problem occurs,
on the other it doesn't. They are using the same build of Emacs on the same
version of Ubuntu. I made my .emacs.d and .ssh directories diff-identical,
just to be sure.

The only thing I could discover was that when I change the contents of my
~/.ssh/known_hosts file, the remote machine that Emacs tries to log into
changes.

Making ~/.ssh/known_hosts empty did not help, it merely caused Emacs to
select a different remote host than the one it chose with my original
known_hosts file.

In all cases, the remote host Emacs was trying to connect to was one
mentioned in my ~/.ssh/config file, but this identical file is present on
the machine where I cannot reproduce the problem.

In any case, the contents of my SSH configuration should not really causing
a problem!

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #54 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 17:47:45 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 17:33, Reuben Thomas <rrt <at> sc3d.org> wrote:

>
> After some more testing, I can still reproduce the problem where with the
> patched TRAMP 2.8.0.1, and using vertico 2.4, Emacs 30.1 tries to log into
> a remote host when I type C-x C-f /
>

Something of a breakthrough: I still have the problem when I disable
vertico-mode. Stand down, Daniel!

Still no idea why it happens on one machine and not another with an
identical configuration. And it definitely doesn't happen when I run Emacs
with a minimal configuration.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #57 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 18:02:09 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 17:47, Reuben Thomas <rrt <at> sc3d.org> wrote:

> On Thu, 7 Aug 2025 at 17:33, Reuben Thomas <rrt <at> sc3d.org> wrote:
>
>>
>> After some more testing, I can still reproduce the problem where with the
>> patched TRAMP 2.8.0.1, and using vertico 2.4, Emacs 30.1 tries to log into
>> a remote host when I type C-x C-f /
>>
>
Further, I can reproduce with Emacs 31 (git master at the time of writing).
I'll bisect my config.

-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #60 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: Daniel Mendler <mail <at> daniel-mendler.de>, 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 07 Aug 2025 19:41:13 +0200

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

>         After some more testing, I can still reproduce the problem
>         where with the patched TRAMP 2.8.0.1, and using vertico 2.4,
>         Emacs 30.1 tries to log into a remote host when I type C-x C-f
>         /
>
> Further, I can reproduce with Emacs 31 (git master at the time of
> writing). I'll bisect my config.

Pls try to provide a recipe starting with 'emacs -Q', like the one I
have shown in my last message. This makes it much more convenient to
hunt a bug.

Best regards, Michael.

Message #63 received at 79173-done <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 79173-done <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Thu, 7 Aug 2025 19:34:18 +0100

[Message part 1 (text/plain, inline)]

On Thu, 7 Aug 2025 at 18:41, Michael Albinus <michael.albinus <at> gmx.de> wrote:

>
> Pls try to provide a recipe starting with 'emacs -Q', like the one I
> have shown in my last message. This makes it much more convenient to
> hunt a bug.
>

In the end, the problem turned out to be some advice for
completion-file-table-name I picked up from Stack Exchange:
https://emacs.stackexchange.com/a/45246/13004

to ignore dot files unless they are explicitly asked for in file-find.

I don't propose to try to delve into it; most likely, the bug is in that
code, and the reason that everything worked on one machine and not another
has to do with different disk contents.

Many thanks again for your help.


-- 
https://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #66 received at 79173 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Reuben Thomas <rrt <at> sc3d.org>
Cc: 79173 <at> debbugs.gnu.org
Subject: Re: bug#79173: 30.1; TRAMP simplified syntax produces empty
 completing-read candidates
Date: Fri, 08 Aug 2025 09:12:38 +0200

Reuben Thomas <rrt <at> sc3d.org> writes:

Hi Reuben,

> In the end, the problem turned out to be some advice for
> completion-file-table-name I picked up from Stack Exchange:
> https://emacs.stackexchange.com/a/45246/13004
>
> to ignore dot files unless they are explicitly asked for in file-find.

Good to know there's no slumbering bug here in Emacs or Vertico.
  
> Many thanks again for your help.

Best regards, Michael.

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