Bug#412041: libmail-gnupg-perl: encryption methods behave weirdly if bad recipients are passed

[Celejar]

Package: libmail-gnupg-perl
Version: 0.08-2
Severity: normal

All four of the encryption methods behave strangely and inconsistently
when passed recipients for which gpg can't find public keys. gpg itself
consistently returns: 'gpg: error reading key: public key not found'.
The Mail::GnuPG encryption methods sometimes behave correctly, returning a
non-zero status code, with $self->{last_message} containing:

gpg: recipient: skipped: public key not found
 gpg: [stdin]: encryption failed: public key not found

where 'recipient' is the unmatched recipient.

But sometimes, the program just dies without any explanation, dropping
unceremoniously to a command prompt. This occurs even when running under
rhe debugger; the debugger itself just terminates with no explanation.

The following simple program exhibits the aforementioned behavior:

---Begin Program---

#! /usr/bin/perl -w

use strict;

use MIME::Parser;
use Mail::GnuPG;

my $msg = MIME::Entity->build(Subject => 'Test', From => 'a at b.c', To => 'd at e.f', Data => "Some text.\nSome more text.\n");
my $mg = new Mail::GnuPG;
my $status = $mg->mime_encrypt($msg, 'd at e.f'); 
!$status or die "@{$mg->{last_message}}\n";
print "Message successfully encrypted.\n";

---End Program---

When I run this repeatedly in succession, sometimes I get the above
'gpg: ...' error lines, and sometimes the program just terminates with
no output. The 'print' line is never reached.

I'm just a perl newbie, but this behavior can't be right; surely the
methods should consistently return an error code and not just silently
terminate.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-lizzie
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages libmail-gnupg-perl depends on:
ii  libgnupg-interface-perl       0.33-6     Perl interface to GnuPG
ii  libmailtools-perl             1.74-1     Manipulate email in perl programs
ii  libmime-perl                  5.420-1    Perl5 modules for MIME-compliant m
ii  perl                          5.8.8-7    Larry Wall's Practical Extraction 

libmail-gnupg-perl recommends no packages.

-- no debconf information