Thanks. Here's a simplified version of what I ended up doing (for anyone
searching for a similar thing):
In custom_functions/lib/puppet/parser/functions/determine_role.rb:
module Puppet::Parser::Functions
newfunction(:determine_role, :type => :rvalue) do |args|
# args[0] should be a fact name like clientcert or fqdn.
hostname = lookupvar(args[0])
matches = hostname.match(/^([^0-9.]+)[0-9.]/).captures
role = matches[0]
return role
end
end
In manifests/site.pp
$role = determine_role('clientcert')
node default {
hiera_include('classes')
}
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