GNU bug report logs - #70901
30.0.50; Tramp doesn't use ControlMaster even with (setq tramp-use-connection-share nil)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry Gutov <dmitry <at> gutov.dev>
Subject: bug#70901: closed (Re: bug#70901: 30.0.50; Tramp doesn't use
 ControlMaster even with (setq tramp-use-connection-share nil))
Date: Sat, 25 May 2024 09:44:02 +0000

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Your bug report

#70901: 30.0.50; Tramp doesn't use ControlMaster even with (setq tramp-use-connection-share nil)

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 70901 <at> debbugs.gnu.org.

-- 
70901: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70901
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Dmitry Gutov <dmitry <at> gutov.dev>
Cc: 70901-done <at> debbugs.gnu.org
Subject: Re: bug#70901: 30.0.50; Tramp doesn't use ControlMaster even with
 (setq tramp-use-connection-share nil)
Date: Sat, 25 May 2024 11:42:49 +0200

Version: 30.1

Dmitry Gutov <dmitry <at> gutov.dev> writes:

> Hi Michael,

Hi Dmitry,

>> I've changed it such a way that the message "Opening connection ..."
>> appears only until the prompt from remote is seen. For the rest, there
>> will be another message "Setup connection ...".
>> As bonus, the "Opening connection ..." message appears now for every
>> hop
>> in the multi-hop case. This is new.
>> Could you pls check the appended patch?
>
> It's working well, thank you.

Thanks for the feedback. Pushed to master, closing the bug.

> A minor downside is more messages, but at level 3 Tramp is fairly
> chatty anyway - so people who would be bothered by it should reduce
> the value of 'tramp-verbose'. But now the connection process looks
> more clear.

You cannot have both: dividing the message into two different ones, and
not making Tramp more chatty. And if you change the message level of
"Setup connection ..." to something different, there will be a quiet
Tramp saying "Opening connection ... done" w/o returning control to the
user for a while. Another source of complaints I like to avoid.

The change, that Tramp says now "Opening connection ..." for every hop
in a multi-hop environment is an advantage I believe. You have a better
view on where Tramp is working (and maybe being blocked).

> Best regards,
> Dmitry

Best regards, Michael.

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; Tramp doesn't use ControlMaster even with (setq
 tramp-use-connection-share nil)
Date: Mon, 13 May 2024 05:00:28 +0300

I have ~/.ssh/config set up correctly enough that

ssh <user>@<host> in the terminal connects quickly (and when I Ctrl-D
out of it, it finishes with "Shared connection to <...> closed.")

But I haven't been able to make Tramp reuse the connection.

I (setq tramp-use-connection-share nil) - so it would pick up the user
settings from my ssh config - and the first 'C-x C-f /ssh:user <at> host:'
takes a lot of time anyway with its "Opening connection ...".

For context: I'm on a high-latency network node geographically, and
using an even slower server for this example. I.e. my ping to it is
~170ms, but the full new ssh connection takes around 4 seconds.

On a related note, are asynchronous processes supposed to use
ControlMaster when it's available? I get "Opening connection ..." for
every M-& call, for example.

In GNU Emacs 30.0.50 (build 7, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.0, Xaw scroll bars) of 2024-05-12 built on potemkin
Repository revision: b20d4ab374fb9b3c80b968df6acd6444f763bd40
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12302000
System Description: Ubuntu 23.10

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