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bug#35241: 27.0.50; Tramp can't decrypt .authinfo.gpg in Win 10

From: Shuguang Sun
Subject: bug#35241: 27.0.50; Tramp can't decrypt .authinfo.gpg in Win 10
Date: Wed, 17 Apr 2019 10:02:29 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (windows-nt)

Michael Albinus <address@hidden> writes:

> Shuguang Sun <address@hidden> writes:
> Hi,
>>>>   tramp-file-name-handler(expand-file-name "." "/plink:address@hidden:")
>>>>   locate-file-internal("gpg2" (list of path) (".exe" ".com" ".bat"
>>>> ".cmd" ".btm" "") 1)
>>>>   executable-find("gpg2")
>>> This is the crucial part. `executable-find' shall operate on the local
>>> file system only. But it calls `locate-file-internal' with a PATH
>>> pointing to remote.
>>> I suppose you have edited the backtrace, and written (list of path).
>>> What is there? My crystal ball tells me it contains "." ...
>> Sorry. I do modified it here. It is the local path, not remote. And it
>> contains "." which looks like:
>>   locate-file("gpg2" ("." "C:/Users/username/emacs/bin/"
>> "C:/Users/username/scoop/apps/gnupg/current/bin/"
>> "C:/Users/username/scoop/shims/" 
>> "C:/Users/username/Progs/msys64/mingw64/bin/"
>> "C:/Users/username/Progs/msys64/usr/bin/"
>> "C:/Users/username/Progs/miktex-portable/texmfs/insta..."
>> "C:/Users/username/AppData/Local/Microsoft/WindowsApp...") (".exe" ".com"
>> ".bat" ".cmd" ".btm" "") 1)
> Thanks, as I've expected. A relative file name like "." is the
> problem. If the current directory is a remote one, it expands to a
> remote directory inside exec-path, with all the hassle.
> How does come "." into exec-path? Have you set this in your .emacs? Or
> is it part of the PATH environment variable on your system? You know,
> that it is discouraged to add "." to your PATH for security reasons.

I added it in my configure file years ago and can't remember the reasons.
I remove this part (add "." to exec-path) from my configure, and then it works 
Tramp can open gpg.

> Relative file names are not forbidden as part of exec-path. Shall we ban
> them (with an error message)? Or shall we ignore them, silently? Don't know.
> I'd vote for the latter (including proper documentation).
> Best regards, Michael.

Best Regards
Shuguang Sun

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