Fact exchange

factsd.rb

#!/usr/bin/ruby
    
if File.exists?("/etc/facts.d")   

entries = Dir.entries("/etc/facts.d/")
name_map = {}
entries.each do |entry|
  if File.file?("/etc/facts.d/#{entry}")    
    ext = entry.split('.')[1]
    name_map[ext] ||= []
    name_map[ext] << entry
    value = File.readlines("/etc/facts.d/#{entry}").join('')
    Facter.add(entry){ setcode { value }}
  end
end

name_map.keys.each do |key|
  Facter.add("#{key}_keys"){ setcode {name_map[key].sort.join(',')} }
end

end

lesson18.pp

class p4h::lesson18() { 

        file { '/root/README':
                content => "##lesson18
Happy hacking!\n",
        }

        file { '/etc/facts.d/':
               ensure => 'directory',
               recurse => true,
               purge  => true,
               force  => true
        }

        @@file { "/etc/facts.d/${$hostname}.cluster":
                 content => "${hostname}",
                 require => File['/etc/facts.d/'],
                 tag     => 'cluster' 
        }

        File <<| tag == 'cluster' |>> {}
}

result on node a

[root@lesson18a ~]# facter -p | grep cluster
cluster_keys => lesson18a.cluster,lesson18b.cluster,lesson18c.cluster
lesson18a.cluster => lesson18a
lesson18b.cluster => lesson18b
lesson18c.cluster => lesson18c