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Re: [BUG] org-open-file immediately termininates when calling xdg-open t

From: Max Nikulin
Subject: Re: [BUG] org-open-file immediately termininates when calling xdg-open that calls emacsclient
Date: Sun, 22 May 2022 15:13:41 +0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1

On 22/05/2022 11:37, Ihor Radchenko wrote:

I have a problem with the following commits:

869b7a21b org-open-file: Avoid make-process for Emacs 24 compatibility
5db61eb0f org.el: Avoid xdg-open silent failure

They both set process-connection-type to nil/'pipe. Somehow, this change
breaks org-open-file for me when org-open-file calls xdg-open and xdg is
confugured to open the file with emacsclient. I only see a flicker and
the file does not open. Sometimes, Emacs even crashes.

I can not reproduce a problem, however I tried to factor-out xdg-open. Emacs-27.1, a minimal LXC container, so "&" to simulate kde-open5 starting process in background. On the other hand I consider behavior when emacsclient is called from emacs as confusing due to requirement of C-x # to notify emacs about completion.

---- >8 ----
#+begin_src elisp
  (push '("\\.txt\\'" . "emacsclient %s &") org-file-apps)

---- 8< ----

Nothing happens if emacs server is not started, but error handling was sacrificed for compatibility with old emacs versions.

Do you see the same problem for a function from mailcap.el in the development emacs version?

Eli Zaretskii suspected some compatibility issue, but he successfully resisted my attempts to pull some details from him. I know how to create a MIME handler that will cause 100% CPU consumption by Emacs for pipe processes, but he does not consider it as a real problem.

If I change the process type back to default tty value, things work
again as expected.

You might try `call-process' with 0 as DESTINATION (attention! not nil!).

See #+begin_comment snippet from the following patch (this part was not committed since Robert convinced me that it is confusing): Max Nikulin to emacs-orgmode. [PATCH v3] Fix FAQ entry about mailto links. Mon, 14 Feb 2022 20:22:14 +0700. https://list.orgmode.org/9437ade2-af18-f97e-8790-a2df27c9017c@gmail.com

I do not know a way to reliably launch external MIME handler from Emacs. All means I am aware of have some caveats.

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