[gollem] Dynamic SMB location in gollem backend

[Matthew]

Been setting up a new horde install, with imp, gollem and others. 
Authentication is imp-based, with the main horde username being 
my.name at mydomain.com - and then luckily the hordeauth parameter in the 
backend config allows me to then just take the my.name which my SMB back 
end requires for login.

All good, working well with the 3 general shares on my server - each one 
getting a separate backend entry along the lines of:

     $backends['smbdocuments'] = array(
     'disabled' => false,
     'name' => 'Documents',
     'driver' => 'smb',
     'shares' => true,
     'hordeauth' => true,
     'params' => array(
         'hostspec' => 'localhost',
         'share' => 'documents',
         'port' => 139,
         'smbclient' => '/usr/bin/smbclient',
     )

However, each user also has their own private share, which in my setup 
(Zentyal) must be accessed at localhost/my.name - so I need something 
like this:

     $backends['home'] = array(
     'disabled' => false,
     'name' => 'My home folder',
     'driver' => 'smb',
     'shares' => true,
     'hordeauth' => true,
     'params' => array(
         'hostspec' => 'localhost/my.name',
         'share' => '',
         'port' => 139,
         'smbclient' => '/usr/bin/smbclient',
     )

Hardcoding this with my own name works just fine. But of course I need 
the my.name to reflect the logged in user. I can't quite figure out 
how/where/when I can do this - there don't seem to be hooks for gollem, 
and I don't think the global variables which would allow me to do 
something like:

'hostspec' => 'localhost/'.$GLOBALS['registry']->getAuth(true),

  Because that info isn't there yet when this backend config gets 
called. Any ideas as to how to achieve this?

MTIA, Matthew