Parenting files

shell.sh

[root@puppet2017 ~]# echo -e "/tmp/foo\n/tmp/bar" > /tmp/whitelist
[root@puppet2017 ~]# ruby /root/test.rb
App_file[/tmp/foo]
App_file[/tmp/bar]

test.rb

#!/opt/puppetlabs/puppet/bin/ruby

require 'puppet'
Puppet.initialize_settings

Puppet::Type.newtype(:app_file) do
  ensurable
  newparam(:path, :namevar => true) do
    validate do |value|
      unless Puppet::Util.absolute_path?(value)
        fail Puppet::Error, _("File paths must be fully qualified, not '%{path}'") % { path: value }
      end
    end
  end
end

Puppet::Type.type(:app_file).provide(
  :file,
  :parent => Puppet::Type.type(:file).provider(:posix)
) do
  def self.instances
    f = File.read '/tmp/whitelist'
    f.split("\n").collect do |whitef|
      res_hash          = Hash.new
      res_hash[:ensure] = :present
      res_hash[:path]   = whitef
      res_hash[:name]   = whitef
      new(res_hash)
    end
  end

  def self.prefetch(resources)
    fs = instances
    resources.keys.each do |file|
      if provider = fs.find{ |f| f.path == file }
        resources[file].provider = provider
      end
    end
  end

  def exists?
    @property_hash[:ensure] == :present
  end
end

puts Puppet::Type.type(:app_file).instances.to_a