Puppet users - Feb 2013 - Possible to evaluate embedded variables?

Given a variable that holds a class name is it possible to resolve the 
value of a variable within  that class?  For example 

class classes::myclass{
  $install_dir = ''/xyz''
}

class example($class_name=''classes::myclass''){
 file {"/mylink" :
    ensure => link,
    target => "${${class_name}::install_dir}",
  }
}

Right now it appears that the parser doesn''t recognize the inner
variable.
Currently running puppet v3.0.1.
I would like the target of the link to resolve to /xyz.  Is this possible?  

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On Saturday, February 2, 2013 12:55:56 PM UTC-6, Schofield
wrote:
>
> Given a variable that holds a class name is it possible to resolve the 
> value of a variable within  that class?

Yes, via an inline_template, but it''s a bad idea.
 
>   For example 
>
> class classes::myclass{
>   $install_dir = ''/xyz''
> }
>
> class example($class_name=''classes::myclass''){
>  file {"/mylink" :
>     ensure => link,
>     target => "${${class_name}::install_dir}",
>   }
> }
>
> Right now it appears that the parser doesn''t recognize the inner
variable.
> Currently running puppet v3.0.1.
> I would like the target of the link to resolve to /xyz.  Is this 
> possible?  
>
>
Just to show that it can be done, you should be able to use

  target => inline_template("<%= 
scope.lookupvar(''${class_name}::install_dir'') %>") 

But again, don''t do that.  It is fragile, and it is virtually
guaranteed to
become a mess.

If you would like to discuss alternative approaches to the actual problem 
you are trying to solve, then we would be pleased to do so.


John

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