bug#71500: 28.2; Can't create/open .gpg file name contains non-ascii encoding in windows

[Eli Zaretskii <eliz@gnu.org>]

Ping!  Did you have a chance to try Emacs 30 (now on the emacs-30
branch of the Emacs Git repository)?

> Cc: 71500@debbugs.gnu.org
> Date: Wed, 12 Jun 2024 10:52:23 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > From: Tatsuya Kumazawa <billy.hotwind@gmail.com>
> > Date: Tue, 11 Jun 2024 22:35:23 +0900
> > 
> > When I save .gpg file contains non-ASCII(eg: e:/あ.gpg).
> > 
> > I got message below
> > (It happens anytime when user name contains non-ASCII
> > (it must to change epg-gpg-home-directory to ASCII only path))
> > 
> > ----
> > Error while encrypting with "e:/msys2/usr/bin/gpg.exe":
> > 
> > gpg: can't create 'c:/Users/(my name with CP932 encoded by
> > UTF-8)/AppData/Local/Temp/epg-output9UGAFQ': No such file or directory
> > gpg: symmetric encryption of '[stdin]' failed: No such file or directory
> > ----
> > 
> > 
> > When I open e:/あ.gpg, I got
> > 
> > ----
> > Error while decrypting with "e:/msys2/usr/bin/gpg.exe":
> > 
> > gpg: can't open 'e:/邵ｺ繝ｻgpg': No such file or directory
> > gpg: decrypt_message failed: No such file or directory
> > ----
> > 
> > It seems UTF-8 encode by CP932 binary sequence.
> > 
> > share\emacs\28.2\lisp\epg.el
> > 
> > 673:                                                     :coding 'raw-text
> > 
> > to
> > 
> > 673:                                                     :coding
> > '(raw-text . cp932)
> > 
> > (CP932 is japanese charactor code of windows)
> > seemsly worked in my environment.
> > 
> > 
> > 
> > It might be good from cp932 to system process encoding for multilanguage?
> 
> There were some encoding problems in epg that were fixed recently in
> the development sources.  Can try Emacs 30 from the master branch of
> the Emacs Git repository and see if the problem still exists there?
> 
> In any case, on MS-Windows Emacs can only support GPG-encoding of file
> names that can be encoded in your system codepage, due to limitations
> of how Emacs on Windows invokes sub-processes.  So this will only work
> of cp932 is your system codepage.
> 
> 
> 
>