GNU bug report logs - #20015
25.0.50; Slow Emacs startup after recent TRAMP changes

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Daniel Colascione <dancol <at> dancol.org>, Andreas Schwab <schwab <at> linux-m68k.org>, 20015 <at> debbugs.gnu.org, Tassilo Horn <tsdh <at> gnu.org>
Subject: bug#20015: 25.0.50; Slow Emacs startup after recent TRAMP changes
Date: Mon, 09 Mar 2015 00:41:57 -0400

> only 3 times, and it is called only when you open a remote file
> (tramp.el is loaded).

Loading tramp.el does not guarantee we want to open a remote file (it
could be a local file via /su: for example).

> I would like to avoid these calls completely, if somebody could tell me
> a robust test for knowing which kind of ControlMaster, ControlPath and
> ControlPersist options are supported by the local ssh stanza. And no, I
> don't want to check the ssh version; this isn't robust.

I like using "" for tramp-ssh-controlmaster-options, FWIW ;-)

FWIW, I find that for OpenSSH on Debian, "ssh -o
<optionname>=<optiovalue>" never waits and gives different outputs
("command-line: line 0: Bad configuration option: <optionname>",
"command-line line 0: unsupported option <optionvalue>", or the help
text).  Not sure if it's robust for other systems and other versions of ssh.


        Stefan

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