GNU bug report logs - #78500
Tramp hard to debug

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Package: emacs;

Reported by: Daniel Colascione <dancol <at> dancol.org>

Date: Mon, 19 May 2025 22:59:02 UTC

Severity: normal

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#78500; Package emacs. (Mon, 19 May 2025 22:59:03 GMT) Full text and rfc822 format available.
Acknowledgement sent to Daniel Colascione <dancol <at> dancol.org>:
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From: Daniel Colascione <dancol <at> dancol.org>
To: bug-gnu-emacs <at> gnu.org
Subject: Tramp hard to debug 
Date: Mon, 19 May 2025 18:58:04 -0400

[Message part 1 (text/plain, inline)]
Tramp uses condition-case extensively for cleanup on error. This pattern has the side effect of blocking debugging without adding the debug keyword to the condition list. 
[Message part 2 (text/html, inline)]
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#78500; Package emacs. (Tue, 20 May 2025 21:57:03 GMT) Full text and rfc822 format available.

Message #8 received at 78500 <at> debbugs.gnu.org (full text, mbox):

From: Jeremy Bryant <jb <at> jeremybryant.net>
To: Daniel Colascione <dancol <at> dancol.org>
Cc: 78500 <at> debbugs.gnu.org
Subject: Re: bug#78500: Tramp hard to debug
Date: Tue, 20 May 2025 22:55:53 +0100

Daniel Colascione <dancol <at> dancol.org> writes:

> Tramp uses condition-case extensively for cleanup on error. This
> pattern has the side effect of blocking debugging without adding the
> debug keyword to the condition list.

Do you have a design idea for a patch to fix this?
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#78500; Package emacs. (Wed, 21 May 2025 07:21:02 GMT) Full text and rfc822 format available.

Message #11 received at 78500 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Daniel Colascione <dancol <at> dancol.org>
Cc: 78500 <at> debbugs.gnu.org
Subject: Re: bug#78500: Tramp hard to debug
Date: Wed, 21 May 2025 09:20:25 +0200

Daniel Colascione <dancol <at> dancol.org> writes:

Hi Daniel,

> Tramp uses condition-case extensively for cleanup on error. This
> pattern has the side effect of blocking debugging without adding the
> debug keyword to the condition list. 

Feel free to add the debug keyword where it is helpful.

Note also the comment in tramp-compat.el, section TODO:

;; * Starting with Emacs 30.1, there is `handler-bind'.  Use it
;;   instead of `condition-case' when the origin of an error shall be
;;   kept, for example when the HANDLER propagates the error with
;;   `(signal (car err) (cdr err)'.

I guess handler-bind behaves differently in case of debugging (I didn't
test yet). This should be taken into account.

Best regards, Michael.
This bug report was last modified 3 days ago.

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