GNU bug report logs - #38079
On Windows tramp hangs after server-start is called

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Wanrong Lin <wrglin <at> gmail.com>
Subject: bug#38079: closed (Re: bug#38079: On Windows tramp hangs after
 server-start is called)
Date: Thu, 07 Nov 2019 17:46:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#38079: On Windows tramp hangs after server-start is called

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 38079 <at> debbugs.gnu.org.

-- 
38079: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38079
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: Wanrong Lin <wrglin <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 38079-done <at> debbugs.gnu.org
Subject: Re: bug#38079: On Windows tramp hangs after server-start is called
Date: Thu, 07 Nov 2019 18:45:08 +0100

Version: 27.1

Wanrong Lin <wrglin <at> gmail.com> writes:

> Yes it does. Thanks.

Thanks for the feedback. I've committed the patch to the repositories,
closing the bug.

> Wanrong

Best regards, Michael.

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From: Wanrong Lin <wrglin <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: On Windows tramp hangs after server-start is called
Date: Tue, 5 Nov 2019 19:52:59 -0500

On Windows, after M-x server-start, tramp no longer works. When I tried 
to connect to a "pscp" remote Linux host, it just hangs at the message 
"Remote prompt found" (something like that).

Today I finally figured out what the problem is, and put in a work 
around as following:

;; On Windows, after "server-start" is called, somehow (system-name) 
will return lower case host name. If the original
;; (system-name) returns upper case host name now 
tramp-restricted-shell-hosts-alist will be out-of-date and cause
;; tramp not to function properly.
(defadvice server-start (after update-restricted-host-list last activate)
  (setf tramp-restricted-shell-hosts-alist
        (when (memq system-type '(windows-nt))
          (list (concat "\\`" (regexp-quote (system-name)) "\\'")))))

But the proper fix should be to make sure (system-name) always returns 
the same string consistently. I found it is this sexp in "server-start" 
function that changes the return value of (system-name):

      (setq server-process
        (apply #'make-network-process ....))

This bug has bothered me for a long time. Even Emacs 26.3 still has it 
(although I am still using 26.2 for daily work). I hope this can lead to 
a fix that saves some frustration for other fellow Emacs users.

Here is my set up:

In GNU Emacs 26.2 (build 1, x86_64-w64-mingw32)
 of 2019-04-13 built on CIRROCUMULUS
Repository revision: fd1b34bfba8f3f6298df47c8e10b61530426f749

Warren

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