Puppet users - Jun 2009 - Variables in definitions

Hi,

A quick "Hello" to every as this is my first post on the Puppet Users
group.

I had some training with Teyo in London recently and am busy
evaluating Puppet to replace a config engine developed for internal
use at my company.

Question: Is it possible to refer to variables declared inside
realised definitions?

Here''s a basic example of how to refer to variables defined inside the
scope of a class that is not your own :-

test.pp
----------
class foo {
    $bar = ''baz''
}
include foo
notice("$foo::bar")

output :-
----------
notice: Scope(Class[main]): baz

Is there any equivalent syntax for definitions along the lines of :-

$foo[''somename'']::bar

Is it possible to do something similar with definitions or is this
just abuse of Puppet principles ;-)

Basically what I''m trying to achieve is the set up of a bunch of
scopes with variables in them. These are then combined in various ways
to configure multiple instances of an application on a individual
system (of which there may be many).

It''s proving to be tougher than I thought ;-)

Any thoughts or suggestions on the direction I could take from here?

Regards,

David Moss

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DrKJam schrieb:
> Hi,
> 
> A quick "Hello" to every as this is my first post on the Puppet
Users group.
> 
> I had some training with Teyo in London recently and am busy
> evaluating Puppet to replace a config engine developed for internal
> use at my company.
> 
> Question: Is it possible to refer to variables declared inside
> realised definitions?
> 
> Here''s a basic example of how to refer to variables defined inside
the
> scope of a class that is not your own :-
> 
> test.pp
> ----------
> class foo {
>     $bar = ''baz''
> }
> include foo
> notice("$foo::bar")
> 
> output :-
> ----------
> notice: Scope(Class[main]): baz
> 
> Is there any equivalent syntax for definitions along the lines of :-
> 
> $foo[''somename'']::bar
> 
> Is it possible to do something similar with definitions or is this
> just abuse of Puppet principles ;-)
Currently this is not possible.
> Basically what I''m trying to achieve is the set up of a bunch of
> scopes with variables in them. These are then combined in various ways
> to configure multiple instances of an application on a individual
> system (of which there may be many).
> 
> It''s proving to be tougher than I thought ;-)
> 
> Any thoughts or suggestions on the direction I could take from here?
That''s a tough question to answer without actually seeing your specific
requirements.

The common way would be to create a define representing application 
instances and using this define to setup instances:

| define application($path1, $path2, $param1, $param2) { ... }


Regards, DavidS
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