GNU bug report logs - #24553
25.1; epa ignores epg-gpg-program in very confusing way

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 16emacsbug <at> nospam.scs.stanford.edu
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1; epa ignores epg-gpg-program in very confusing way
Date: Tue, 27 Sep 2016 01:15:40 -0700

I need to edit some files that decrypt properly with gpg 1.4 but not gpg
2.1.  I have both installed on my system, with 1.4 as /usr/bin/gpg1 and
2.1 as /usr/bin/gpg2.  The bug is that emacs ignores the epg-gpg-program
variable *except* in error messages, which is very confusing.  To
reproduce this problem, do the following:

  * Run strace -o /tmp/log emacs -Q
  * Eval expression (setq epg-gpg-program "/usr/bin/gpg1")
  * Open a gpg-encrypted file

By examining /tmp/log, or running ps, you can see that emacs is
executing a command like the following:

        /usr/bin/gpg2 --no-tty --status-fd 1 --yes --enable-progress-filter --command-fd 0 --output /tmp/epg-output6602ygi --decrypt -- /tmp/x.gpg

However, when it fails to decrypt, it prints the message:  Error while
decrypting with "/usr/bin/gpg1."  This is obviously very frustrating
since gpg1 can in fact decrypt the file.  Ideally emacs should obey
epg-gpg-program, but if it doesn't, it should properly report what
failed.




In GNU Emacs 25.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.20.9)
 of 2016-09-18 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Arch Linux

Configured using:
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Message #8 received at 24553 <at> debbugs.gnu.org (full text, mbox):

From: Nick Helm <nick <at> tenpoint.co.nz>
To: <24553 <at> debbugs.gnu.org>
Subject: Re: bug#24553: 25.1; epa ignores epg-gpg-program in very confusing way
Date: Thu, 29 Sep 2016 16:07:43 +1300

> I need to edit some files that decrypt properly with gpg 1.4 but not gpg
> 2.1.  I have both installed on my system, with 1.4 as /usr/bin/gpg1 and
> 2.1 as /usr/bin/gpg2.  The bug is that emacs ignores the epg-gpg-program
> variable *except* in error messages, which is very confusing.  

> Ideally emacs should obey epg-gpg-program ...

I have a similar problem with epg-gpg-program. See bug#24229
(https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24229) for some
discussion that might be relevant.

Message #11 received at 24553 <at> debbugs.gnu.org (full text, mbox):

From: Daiki Ueno <ueno <at> gnu.org>
To: Nick Helm <nick <at> tenpoint.co.nz>
Cc: 24553 <at> debbugs.gnu.org
Subject: Re: bug#24553: 25.1; epa ignores epg-gpg-program in very confusing way
Date: Thu, 29 Sep 2016 17:53:09 +0200

Nick Helm <nick <at> tenpoint.co.nz> writes:

>> I need to edit some files that decrypt properly with gpg 1.4 but not gpg
>> 2.1.  I have both installed on my system, with 1.4 as /usr/bin/gpg1 and
>> 2.1 as /usr/bin/gpg2.  The bug is that emacs ignores the epg-gpg-program
>> variable *except* in error messages, which is very confusing.  
>
>> Ideally emacs should obey epg-gpg-program ...
>
> I have a similar problem with epg-gpg-program. See bug#24229
> (https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24229) for some
> discussion that might be relevant.

And I want to close this as a duplicate of that bug.  Is there still
anything we can technically do for this?  Isn't it enough to suggest:

  M-: (custom-set-variables '(epg-gpg-program "gpg1" t))

instead of setq?

Message #14 received at 24553 <at> debbugs.gnu.org (full text, mbox):

From: Ted Zlatanov <tzz <at> lifelogs.com>
To: Daiki Ueno <ueno <at> gnu.org>
Cc: 24553 <at> debbugs.gnu.org, Nick Helm <nick <at> tenpoint.co.nz>
Subject: Re: bug#24553: 25.1; epa ignores epg-gpg-program in very confusing way
Date: Mon, 03 Oct 2016 13:41:19 -0400

On Thu, 29 Sep 2016 17:53:09 +0200 Daiki Ueno <ueno <at> gnu.org> wrote: 

DU> Nick Helm <nick <at> tenpoint.co.nz> writes:
>>> I need to edit some files that decrypt properly with gpg 1.4 but not gpg
>>> 2.1.  I have both installed on my system, with 1.4 as /usr/bin/gpg1 and
>>> 2.1 as /usr/bin/gpg2.  The bug is that emacs ignores the epg-gpg-program
>>> variable *except* in error messages, which is very confusing.  
>> 
>>> Ideally emacs should obey epg-gpg-program ...
>> 
>> I have a similar problem with epg-gpg-program. See bug#24229
>> (https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24229) for some
>> discussion that might be relevant.

DU> And I want to close this as a duplicate of that bug.  Is there still
DU> anything we can technically do for this?  Isn't it enough to suggest:

DU>   M-: (custom-set-variables '(epg-gpg-program "gpg1" t))

DU> instead of setq?

Respectfully, the usability bug here is different: EPA/EPG only uses the
customized value, while the log message only uses the actual value in
the variable. So the log messages should be adjusted, if you want to
keep using the customized value only in EPA/EPG. And perhaps they should
catch and mention the case where the customized value is not the same as
the variable value, again for usability's sake.

HTH
Ted

Message #19 received at 24553-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 24553-done <at> debbugs.gnu.org
Subject: Re: bug#24553: 25.1; epa ignores epg-gpg-program in very confusing way
Date: Fri, 10 Mar 2017 15:16:57 -0500

Version: 26.1

16emacsbug <at> nospam.scs.stanford.edu wrote:

> However, when it fails to decrypt, it prints the message:  Error while
> decrypting with "/usr/bin/gpg1."  This is obviously very frustrating
> since gpg1 can in fact decrypt the file.  Ideally emacs should obey
> epg-gpg-program, but if it doesn't, it should properly report what
> failed.

Thanks for the report. The following improves the error message.

commit b2f20aa (HEAD, master)
Date:   Fri Mar 10 15:14:33 2017 -0500

    Small improvement for epa-display-error (bug#24553)
    
    * lisp/epa.el (epa-display-error): Report the actual program in use.

diff --git a/lisp/epa.el b/lisp/epa.el
index 4378c09..52963b6 100644
--- a/lisp/epa.el
+++ b/lisp/epa.el
@@ -628,7 +628,7 @@ If SECRET is non-nil, list secret keys instead of public keys."
 		       (`import-keys "Error while importing keys with \"%s\":")
 		       (`export-keys "Error while exporting keys with \"%s\":")
 		       (_ "Error while executing \"%s\":\n\n"))
-		     epg-gpg-program)
+		     (epg-context-program context))
 		    "\n\n"
 		    (epg-context-error-output context)))
 	  (epa-info-mode)

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