Puppet users - Oct 2014 - Best way to do custom facts based on 3rd party data

Hello,

I'm using puppet enterprise 3 with hiera and roles/profiles. I'm trying
to
find a good way to handle some facts (namely role) being generated on the 
master and sourced based on the underlying hypervisor. I.e., if the node is 
running on EC2 then the role would be from a tag, for vSphere the role 
would come from either a tag or custom attribute, etc, and a fallback would 
be to just take the first part of the hostname minus any number (e.g., 
web1.colo.domain.com would be web).

I know I can use custom facts on the client itself but I'd like to keep it 
on the master so I don't have to worry about credentials on all nodes, 
nodes not having access to the source (not having a route to the API, etc), 
nodes being able to "change" their role, etc.

The main use for this fact is in hiera:

hiera.yaml:
:hierarchy:
  - nodes/%{::clientcert}
  ...
  - roles/%{::role}
  ...
  common

Any suggestions?

Thanks
Kimo

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