Puppet users - Jul 2013 - Accessing methods of parent provider

I''m taking some time to refactor a custom provider.  I''m
trying to move
common code into a parent provider so that it can be shared among all 
custom resource providers in the puppet module.  While verifying I can call 
methods in the parent provider I get the following error:

Error: Could not prefetch jboss7_deployment provider ''jboss7'':
    undefined method `echo'' for 
Puppet::Type::Jboss7_deployment::ProviderJboss7:Class

Here are the relevant snippets of code

class Puppet::Provider::Jboss7 < Puppet::Provider
  def echo(arg)
    info arg
  end
end

require ''puppet/provider/jboss7''
Puppet::Type.type(:jboss7_deployment).provide(:jboss7, :parent => 
Puppet::Provider::Jboss7) do
  echo "hello world"
  ...
end

I modeled this code after the puppetlabs F5 code on the forge.  
https://github.com/puppetlabs/puppetlabs-f5  I am running puppet version 
3.0.0.  Any thoughts on why the jboss7_deployment resource provider code 
cannot access the echo method of the parent provider?

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On 14.07.2013 02:27, Schofield wrote:
> I''m taking some time to refactor a custom provider.  I''m
trying to move
> common code into a parent provider so that it can be shared among all
> custom resource providers in the puppet module.  While verifying I can
> call methods in the parent provider I get the following error:
> 
> Error: Could not prefetch jboss7_deployment provider
''jboss7'':
>     undefined method `echo'' for
> Puppet::Type::Jboss7_deployment::ProviderJboss7:Class
> 
> Here are the relevant snippets of code
> 
> class Puppet::Provider::Jboss7 < Puppet::Provider
>   def echo(arg)
>     info arg
>   end
> end
so your provider has an instance method "echo" ...
> 
> require ''puppet/provider/jboss7''
> Puppet::Type.type(:jboss7_deployment).provide(:jboss7, :parent =>
> Puppet::Provider::Jboss7) do
>   echo "hello world"
>   ...
> end
.. and here you are calling echo in  a class context that will execute
as soon as the corresponding file is loaded. So depending on your actual
goal you should either only call echo in an instance method

    Puppet::Type.type(:jboss7_deployment).provide(:jboss7, :parent =>
Puppet::Provider::Jboss7) do
      def create
        echo "I was created"
      end
    end

or, if you want to call the `echo` method at class level (e.g.
self.prefetch), define your method as a class method in your parent provider

    class Puppet::Provider::Jboss7 < Puppet::Provider
      def self.echo(arg)
        info arg
      end
    end

Does this make sense?

-Stefan

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