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Re: tramp (2.3.1-pre); Can't open file due to wrong local path under MS-

From: Chris Zheng
Subject: Re: tramp (2.3.1-pre); Can't open file due to wrong local path under MS-Windows
Date: Tue, 20 Sep 2016 11:56:02 +0800

From: Michael Albinus <address@hidden>
Subject: Re: tramp (2.3.1-pre); Can't open file due to wrong local path under 
Date: Mon, 19 Sep 2016 14:32:53 +0200

Hello Michael,

> Hi Chris,
>> With Tramp in master branch of Emacs, I can't open file through
>> "/sshx:" under MS-Windows. The recipe starting from "emacs -Q" looks
>> like:
>> C-x C-f /sshx:address@hidden:/root/ RET
> It took me a while to reproduce. The usual test cases don't show up this 
> error.
>> The related messages look like:
>> Tramp: Inserting ‘/sshx:address@hidden:/root/’...
>> Tramp: Encoding remote file ‘/sshx:address@hidden:/root/’ with 
>> ‘base64 <%s’...done
>> Tramp: Decoding local file ‘z:/TEMP/’ with 
>> ‘base64-decode-region’...done
>> Tramp: Inserting ‘/sshx:address@hidden:/root/’...failed
>> Removing old name: No such file or directory, /TEMP/
> Well, you have your temporary directory at z:/TEMP. Per default (at
> least in the environment I could use for test), it is C:/Temp or
> C:/Users/USER/AppData/Local/Temp or so.
> Since "/Temp" is the same directory as "C:/Temp" in Emacs, the problem
> didn't appear to the tests.

I didn't notice this. Maybe this is the cause of the bug. And indeed
in another bug report
in Japanese) the temporary directory is also nonstandard.

>> I think the problem is due to the commit
>> c5f466db6f6b8196b8429db8bb7b74f8090d5d3e
>> Fix Bug#20821
>> * lisp/net/tramp.el (tramp-file-name-handler):
>> * lisp/net/tramp-sh.el (tramp-sh-handle-expand-file-name):
>> Use `tramp-drop-volume-letter'.  (Bug#20821)
>> Since the volume letter ("z:") is dropped, the path becomes wrong. I
>> have read the original report of Bug#20821, but have no idea why the
>> `tramp-drop-volume-letter' was used here. Comment out the first call
>> to `tramp-drop-volume-letter' in `tramp-sh-handle-expand-file-name'
>> did fix the problem for me. Could you please have a look on it?
> I've checked the whole story of that bug. The first change in
> `tramp-file-name-handler' is still needed for fixing the bug. But as
> you've said, calling `tramp-drop-volume-letter' in
> `tramp-sh-handle-expand-file-name' is not needed anymore. I don't recall
> why I have applied it that time; maybe it was also needed, and it is now
> superfluous due to other changes in Tramp.
> Anyway, I have removed that call as proposed by you, committed to the
> repositories. Could you, pls, check?

It is fixed for me. Thank you very much. And I will call others to test.

>> With many thanks,
>> Chris
> Best regards, Michael.



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