Overriding class parameters using a collector

[Vladimir Brik]

Hello,

Is it possible to override parameters of a class using a collector?
(similarly to
https://docs.puppetlabs.com/puppet/latest/reference/lang_resources.html#amending-attributes-with-a-collector)

The following gives "Resource type cls doesn't exist" error:

class cls($arg="default"){notify{$arg:}}

node foo
{
Cls <| |> {arg => "override"}
class{'cls':}
}

It works if I change "class" to "define" though.


Thanks,


Vlad

[José Luis Ledesma]

Have you tried this?

class cls($arg="default"){notify{$arg:}}

node foo
{
        Class <| name=='cls'|> {arg => "override"}
        class{'cls':}
}

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[Henrik Lindberg]

On 2014-17-10 19:29, Vladimir Brik wrote:
> Hello,
>
> Is it possible to override parameters of a class using a collector?
> (similarly to
> https://docs.puppetlabs.com/puppet/latest/reference/lang_resources.html#amending-attributes-with-a-collector)
>

No, that does not work. In 4.0 you will get a specific error like this:
"Error while evaluating a Virtual Query, Classes cannot be collected"

It is not allowed by design, but in earlier versions than 3.7 with
--parser future the error message is really bad.

>
> The following gives "Resource type cls doesn't exist" error:
>
> class cls($arg="default"){notify{$arg:}}
>
> node foo
> {
> Cls <| |> {arg => "override"}
> class{'cls':}
> }
>
> It works if I change "class" to "define" though.
>

Yes, that is allowed.
- henrik


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[jcbollinger]

Yes.  Classes are not resources, though the DSL downplays the distinction.  There is simply no way to implement class parameter overriding that can work reliably.  On the other hand, defined type instances are resources, just like instances of native types such as File. 


John