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

[Chris Zheng]

From: Michael Albinus <address@hidden>
Subject: Re: tramp (2.3.1-pre); Can't open file due to wrong local path under 
MS-Windows
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/htpasswd.py 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/htpasswd.py’...
>> Tramp: Encoding remote file ‘/sshx:address@hidden:/root/htpasswd.py’ with 
>> ‘base64 <%s’...done
>> Tramp: Decoding local file ‘z:/TEMP/tramp.16808GLL.py’ with 
>> ‘base64-decode-region’...done
>> Tramp: Inserting ‘/sshx:address@hidden:/root/htpasswd.py’...failed
>> Removing old name: No such file or directory, /TEMP/tramp.16808GLL.py
> 
> 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
(http://misohena.jp/blog/2016-04-23-tramp-error-because-expand-file-name-and-cygwin-drive.html,
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.

Regards,

Chris