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bug#42984: 27.1; package-list results in error while updating archive du

From: Mirko Vukovic
Subject: bug#42984: 27.1; package-list results in error while updating archive due to malformed path
Date: Thu, 26 Nov 2020 10:58:13 -0500

On Thu, Nov 26, 2020 at 10:38 AM Eli Zaretskii <eliz@gnu.org> wrote:
> From: Mirko Vukovic <mirko.vukovic@gmail.com>
> Date: Thu, 26 Nov 2020 10:28:17 -0500
> Cc: Stefan Kangas <stefan@marxist.se>, 42984@debbugs.gnu.org
> Tracing package--check-signature-content
> * I trace it in plain emacs, started with emacs -Q
> * I edebug the function and step through it
> * I have a single signature and its status is no-pub-key which triggers the No public key error
> * This results in the message in the error buffer with the malformed directory
> Below is the code annotated with values of key variables. I did not see anything obvious.
> I evaluated context at several points. I following deeper into the epg-... functions, stopped when I saw
> compiler macros. I would need guidance to trace those.

Thanks.  I think the situation is clear:

>   ;; #s(epg-context :protocol OpenPGP :program "c:/msys64-a/usr/bin/gpg.exe"

The "C:/msys64-a" part indicates that gpg.exe is an MSYS2 port, not a
native MinGW port.  So it's expected that it will manipulate
Posix-like file names like /c/foo/bar and /home/977315/...  It is also
expected that it may not realize that "c:/foo/bar" is an absolute file
name, since in the Posix world any file name which doesn't begin with
a slash is not an absolute file name.  So it concatenates the file
name passed to it by Emacs with /home/977315/... on the assumption
that the file name passed by Emacs is a relative file name.

Bottom line: you need to install a native MinGW port of gpg, or make
some wrapper script for gpg which would convert Windows d:/foo/bar
file names into the Posix-like format expected by MSYS2 executables.

I think this solved it:
  1. Installed MinGW version: pacman -S mingw64/mingw-w64-x86_64-gnupg
  2. Started emacs -Q in the MingGW64 terminal (not the MSYS2 terminal)
  3. package-list-packages completes without errors:
From the *Messages* buffer:

Importing package-keyring.gpg...done
Setting ‘package-selected-packages’ temporarily since "emacs -q" would overwrite customizations
Package refresh done
Packages that can be upgraded: 2; type ‘U’ to mark for upgrading.

To me this implies that gnupg should be installed along with Emacs 27.1 in MinGW64. I will try to contact the maintainer to suggest that.

Thank you very much for your help.


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