bug#35801: 27.0.50; [w32] Corrupt ~/.emacs.d/elpa/gnupg/ causes Emacs startup failure with gnu-elpa-keyring-update installed (was Re: Investigating Emacs startup failure)

[Eli Zaretskii]

> From: Richard Copley <rcopley@gmail.com>
> Date: Sun, 19 May 2019 20:28:14 +0100
> 
> I got my Emacs into a state where it failed to start. I asked about it on 
> help-gnu-emacs[1]. I fixed my Emacs,
> but didn't get to the bottom of the problem. Stefan asked me to make it a bug 
> report: "such a corrupt directory
> shouldn't prevent use of Emacs".
> 
> After installing "gnu-elpa-keyring-update-2019.3" from GNU ELPA, my Emacs 
> stopped working: when invoked
> as "emacs" from the command line, it printed a message, then exited with 
> status -1 without displaying a
> frame. The message was:
> 
> GPG error: "no usable configuration", OpenPGP
> 
> Emacs started normally when invoked as "emacs -Q". Having done that, I could 
> load my init file with M-x
> load-file, and then everything looked normal and there were no messages or 
> errors.
> 
> I uninstalled all packages (the problem went away) and reinstalled them 
> one-by-one. The problem came back
> after installing "gnu-elpa-keyring-update-2019.3".
> 
> I tried renaming .emacs.d/ to reproduce the problem, but could not. On a 
> hunch I deleted the gnupg/ directory
> in ~/.emacs.d/elpa before reinstalling the "gnu-elpa-keyring-update-2019.3" 
> package. This fixed the problem,
> but also destroyed my means of reproducing it.

What would you suggest we do to make some progress with this bug
report?

Thanks.