[dev] IMP vinfo hook and imp/conf/hooks.php

[Edwin Culp]

Now that I am bringing up a clean horde system free from many months of
hacks, work-arounds and general legacy garbage, I find that I am confused
about how to get with vinfo hook to work without just copying it to the 
bottom of the new dynamically generated conf.php file, which works fine:-)
It would be nice to know how it really should be done.

With egrep -r I can find no reference to a config/hooks.php file being
included to define the hook as per the instructions in conf.xml nor
does it work for me.  

  Warning! Using this to generate your IMP config file will overwrite 
  any existing hooks that you have defined in imp/config/conf.php. Move 
  them to imp/config /hooks.php first.

I also can't find where the resultant generated
$conf['hooks']['vinfo'] = true;

is being referenced nor where the following instructions are being used.

Should we use a custom virtual users hook? If so, make sure you define
_imp_hook_vinfo() in imp/config/hooks.php. The hook will be used to set
$imp['user'] at login time. There are examples in imp/config/hooks.php.dist.

Maybe I'm missing something very simple but I also can't find where 
_imp_hook_vinfo is referenced in the source.

Thanks,

ed
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