Org-mode mailing list
 help / color / mirror / Atom feed
From: Maxim Nikulin <manikulin@gmail.com>
To: emacs-orgmode@gnu.org
Subject: Re: [BUG] [C-u C-u C-c C-o] open link with external program invalid to open file
Date: Mon, 18 Jan 2021 23:32:35 +0700
Message-ID: <ru4d75$11sc$1@ciao.gmane.io> (raw)
In-Reply-To: <87lfho7ja2.fsf@gnu.org>

On 05/09/2020 14:52, Bastien wrote:
> 
> stardiviner <numbchild@gmail.com> writes:
> 
>> When I press =[C-u C-u C-c C-o]= to open an image file link with system external
>> program. It can't open the image file.
> 
> I cannot reproduce the problem here.
> 
> If you still have this issue, can you provide a minimal reproducible
> example?

Christopher Miles recently posted a link to askubuntu that shed some 
light on the problem.

I have compared the following commands:

(start-process-shell-command "xdg-open" nil "xdg-open 
/usr/share/icons/gnome/256x256/actions/stock_print.png")
(start-process-shell-command "eog" nil "eog 
/usr/share/icons/gnome/256x256/actions/stock_print.png")

The latter works in my (test) case (Ubuntu-20.04, ubuntu session - 
gnome), the former does not. If I do not mistake, 
start-process-shell-command is what org mode uses to open file.

Meaningful lines from strace of the emacs process

24108 21:39:51 execve("/bin/bash", ["/bin/bash", "-c", "xdg-open 
/usr/share/icons/gnome/"...], 0x7ffcb1c1fdb0 /* 55 vars */ <unfinished...>
24116 21:39:51 execve("/usr/bin/eog", ["eog", 
"/usr/share/icons/gnome/256x256/a"...], 0x55d009672ec8 /* 57 vars */ 
<unfinished ...>
24108 21:39:51 +++ exited with 0 +++
24116 21:39:51 +++ killed by SIGHUP +++

I think, the problem is that start-process-shell-command creates a "pty" 
process. As soon as main command exits, all children, that belong to the 
same terminal session created by emacs for the process, got killed.

Calling eog directly works because of it does not attempt to go to 
background or demonize.

The solution could be (make-process :connection-type 'pipe ...). 
Personally I would prefer to avoid shell as well when it is not really 
necessary.

I am surprised that in the discussion of problem related to desktop 
integration and perhaps even order in which applications able to handle 
particular file format were installed, nobody mentioned such details, 
neither for "positive" nor for "negative" results. Probably output of 
the following commands (for the proper mime type) could be relevant. The 
complication is that there are several mime handler "databases".

grep image/png /etc/mailcap ~/.mailcap
xdg-mime query default image/png

(mailcap-parse-mailcaps)
(mailcap-mime-info "image/png")

For some handlers there might be even a race, sometimes it might work 
but might fail as well, depending if child could send a message to its 
server quickly enough. In such case providing of ECM might be a challenge.



  reply	other threads:[~2021-01-18 17:04 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-13  7:49 stardiviner
2020-06-13 14:51 ` Nicolas Goaziou
2020-06-14  9:08   ` stardiviner
2020-06-14 21:06     ` Nicolas Goaziou
2021-01-10 11:26   ` [BUG] [C-u C-u C-c C-o] open link with external program auto exited before child process " Christopher Miles
     [not found]   ` <87sg799gnx.fsf@numbchild>
2021-01-10 12:13     ` Christopher Miles
2020-09-05  7:52 ` [BUG] [C-u C-u C-c C-o] open link with external program invalid to " Bastien
2021-01-18 16:32   ` Maxim Nikulin [this message]
2021-01-19  1:53     ` Christopher Miles
2021-01-19 17:00       ` Maxim Nikulin
2021-01-20  3:21         ` Christopher Miles
2021-01-20 16:27           ` Maxim Nikulin
2021-01-21  0:58             ` [PATCH] " Christopher Miles
2021-01-21 17:12               ` Maxim Nikulin
2021-01-22  6:00                 ` Christopher Miles
2021-03-10 14:55                   ` Maxim Nikulin
2021-03-11  9:33                     ` Christopher Miles

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://orgmode.org

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='ru4d75$11sc$1@ciao.gmane.io' \
    --to=manikulin@gmail.com \
    --cc=emacs-orgmode@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Org-mode mailing list

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://orgmode.org/list/0 list/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 list list/ https://orgmode.org/list \
		emacs-orgmode@gnu.org
	public-inbox-index list

Example config snippet for mirrors.
Newsgroups are available over NNTP:
	nntp://news.yhetil.org/yhetil.emacs.orgmode
	nntp://news.gmane.io/gmane.emacs.orgmode


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git