Re: Changing trust in GPGME

2010-01-13 Thread Werner Koch 
On Tue, 12 Jan 2010 23:41:52 +0100, Piotr Bratkowski wrote:

 I have this code. And when I see output owner_trust = 4, but in gpg
 from system I get 0. Do I need to somehow save this changes??

This is not directly supported by GPGME.  You need to write an edit
interactor to control the gpg --edit-key command.  GPA has code which
shows how to do it.

 while(!(err = gpgme_op_keylist_next (ctx,key))) {
  if(key-owner_trust==0)
  {
  key-owner_trust=GPGME_VALIDITY_FULL;
  fprintf(stderr,%i : Key owner= %s fingerprint= %s trust=
 %i\n,i,key-uids-name,key-subkeys-fpr,key-owner_trust);

That is useless.  You are changing a returned value for display.  It
does not make any sense to change it.


Salam-Shalom,

   Werner

-- 
Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.


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Re: Changing trust in GPGME

2010-01-13 Thread Piotr Bratkowski 

Hello,

What is GPA??

Regards,
Piotr Bratkowski


Werner Koch pisze:

On Tue, 12 Jan 2010 23:41:52 +0100, Piotr Bratkowski wrote:

  

I have this code. And when I see output owner_trust = 4, but in gpg
from system I get 0. Do I need to somehow save this changes??



This is not directly supported by GPGME.  You need to write an edit
interactor to control the gpg --edit-key command.  GPA has code which
shows how to do it.

  

while(!(err = gpgme_op_keylist_next (ctx,key))) {
 if(key-owner_trust==0)
 {
 key-owner_trust=GPGME_VALIDITY_FULL;
 fprintf(stderr,%i : Key owner= %s fingerprint= %s trust=
%i\n,i,key-uids-name,key-subkeys-fpr,key-owner_trust);



That is useless.  You are changing a returned value for display.  It
does not make any sense to change it.


Salam-Shalom,

   Werner

  



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Re: Changing trust in GPGME

2010-01-13 Thread Werner Koch 
On Wed, 13 Jan 2010 10:49:03 +0100, Piotr Bratkowski wrote:

 What is GPA??

http://www.gnupg.org/related_software/gpa/

   The GNU Privacy Assistant (GPA) is a graphical user interface for
   the GnuPG (GNU Privacy Guard). GPA utilizes GTK (the GIMP Tool Kit)
   and compiles for various platforms.

Actually GPA was the first GUI frontend for GPG.  The development site
is at:

  http://wald.intevation.org/projects/gpa/



Shalom-Salam,

   Werner

-- 
Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.


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fragility of --edit-key interface [was: Re: Changing trust in GPGME]

2010-01-13 Thread Jameson Rollins 
On Wed, Jan 13, 2010 at 10:39:28AM +0100, Werner Koch wrote:
 On Tue, 12 Jan 2010 23:41:52 +0100, Piotr Bratkowski wrote:
 
  I have this code. And when I see output owner_trust = 4, but in gpg
  from system I get 0. Do I need to somehow save this changes??
 
 This is not directly supported by GPGME.  You need to write an edit
 interactor to control the gpg --edit-key command.  GPA has code which
 shows how to do it.

Hello Werner et. al.  My understanding is that one of the main
advantages of GPGME is that it provides a stable API to gnupg
functionality.  I understand that GPGME doesn't yet provide all the
functionality that a user might need, but I think that suggesting
developers use gpg --edit-key to achieve their desired functionality
should include a strong warning that the interface to gpg --edit-key
is fragile and may change unexpectedly and without warning.

For instance, as of v1.4.10 (and v2.0.13), the edit-key interface to
generate a subkey on an existing key ('addkey') in expert mode changed
such that the RSA (set your own capabilities) selection in the key
type chooser moved from entry 7 to entry 8.  As far as I can tell,
this change was not documented, at least not in the any of the
changelogs associated with recent gnupg releases.  The Monkeysphere
project [0] is using this capability and this undocumented change
recently caused problems.

Developers looking for the stable interface that GPGME is supposed to
provide should be duly warned that the gpg --edit-key interface is
not as stable, and that they should be on the look out for changes to
that interface in the future.

jamie.

[0] http://web.monkeysphere.info/


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