I don't get this exception when locking the pref.

re-reading my previous and horde/config/hook.php :

  * Any preference that is NOT LOCKED, that is set by a hook, WILL BE SAVED
  * WITH THAT VALUE. This means:
  * 1) Users will get the results of the hook set for them in their
  *    preferences.
  * 2) The next time they login and load their preferences, the hook will NOT
  *    be called. However, if the preference is locked, the result of the hook
  *    will never be saved.

From my previous post, If I lock the pref (and hook is enabled), 
Kronolith crashes. This can't be the expected behavior.
$_prefs['search_sources'] = array(
     'value' => "",
     'locked' => true,
     'hook' => true,
     'shared' => false,
     'type' => 'implicit',
);

That's the expected behavior.

I've added the following kronolith hook
     function prefs_hook_search_sources($username = null) {
         if (!$username) {
             return;
         }

         if ($GLOBALS['registry']->hasMethod('contacts/sources')) {
             $sources = $GLOBALS['registry']->call('contacts/sources');
             return implode("\t", array_keys($sources));
         }
     }

and configured the following pref to get 'search_sources' set 
automatically when a (new/old) user logs in :
$_prefs['search_sources'] = array(
     'value' => "",
     'locked' => false,
        'hook' => true,
     'shared' => false,
     'type' => 'implicit',
);

If I set locked to true, kronolith doesn't not work anymore : 
exception 'Kronolith_Exception' with message 'No calendar driver 
specified' in /var/www/html/horde/kronolith/lib/Kronolith.php:2209 
Stack trace: #0 /var/www/html/horde/kronolith/lib/Kronolith.php(432): 
Kronolith::getDriver() #1 
/var/www/html/horde/kronolith/lib/View/Week.php(73): 
Kronolith::listEvents(Object(Horde_Date), Object(Horde_Date)) #2 
/var/www/html/horde/kronolith/lib/Kronolith.php(2267): 
Kronolith_View_Week->Kronolith_View_Week(Object(Horde_Date)) #3 
/var/www/html/horde/kronolith/week.php(15): Kronolith::getView('Week') 
#4 {main}

If I set locked to false, a pref is added in table [horde_prefs] :
rsalmon  | kronolith  | search_sources        | 
e35b32a27eb8a6ecba9d64c5ede2c288        localldap        favourites

From there, kronolith is able to look up attendee's availability.

Though, the hook doesn't work as I would expect : the idea of 
prefs_hook_search_sources is to create, on the fly, a list of all 
possible available address books for the current session.
The first time a user logs in, the hook is kicked off and that's it. 
The next time the user logs in, kronolith seems to be checking first 
if user pref 'search_sources' exists, and if not, reads what's in 
prefs.php
Is this a bug or is this the expected behaviour ?

kronolith $_prefs['search_sources']['value'] is empty
turba $_prefs['addressbooks']['value'] is empty

when adding attendees, I clicked on 'Address book', selected LDAP 
source and selected a user.

This has nothing to do with the display_contacts preference.
The search_sources preference is responsible for determining the 
address books that are searched for free/busy urls.

Here is the list of address books by default :
1 - user's personal address book (MySQL) : empty
2 - global address book (LDAP) : about 50 users
3 - user's favourite recipients (MySQL) : empty

the LDAP address book has the freebusy info.

- With : $_prefs['display_contact']['value'] = 1
Create a new event, add an attendee (a user from LDAP address book) : 
I get the following error:
Error retrieving free/busy information for ronan@mbpgroup.com: No 
free/busy url found for ronan@mbpgroup.com.

-With : $_prefs['display_contact']['value'] = 0 and change the order 
of address book eg, LDAP first and the two other MySQL.
Create a new event, add an attendee (a user from LDAP address book) : 
no error and I'm able to see attendee's availability.


it looks like kronolith isn't looking up user's availability using the 
right source.