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

From: Michael Albinus
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
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

Chris Zheng <address@hidden> writes:

> 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 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?

> With many thanks,
> Chris

Best regards, Michael.

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