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Dir : //opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/resource_template.rb

require_relative '../../puppet/util'
require_relative '../../puppet/util/logging'
require 'erb'

# A template wrapper that evaluates a template in the
# context of a resource, allowing the resource attributes
# to be looked up from within the template.
#  This provides functionality essentially equivalent to
# the language's template() function.  You pass your file
# path and the resource you want to use into the initialization
# method, then call result on the instance, and you get back
# a chunk of text.
#  The resource's parameters are available as instance variables
# (as opposed to the language, where we use a method_missing trick).
#  For example, say you have a resource that generates a file.  You would
# need to implement the following style of `generate` method:
#
#   def generate
#       template = Puppet::Util::ResourceTemplate.new("/path/to/template", self)
#
#       return Puppet::Type.type(:file).new :path => "/my/file",
#           :content => template.evaluate
#   end
#
# This generated file gets added to the catalog (which is what `generate` does),
# and its content is the result of the template.  You need to use instance
# variables in your template, so if your template just needs to have the name
# of the generating resource, it would just have:
#
#   <%= @name %>
#
# Since the ResourceTemplate class sets as instance variables all of the resource's
# parameters.
#
# Note that this example uses the generating resource as its source of
# parameters, which is generally most useful, since it allows you to configure
# the generated resource via the generating resource.
class Puppet::Util::ResourceTemplate
  include Puppet::Util::Logging

  def evaluate
    set_resource_variables
    Puppet::Util.create_erb(Puppet::FileSystem.read(@file, :encoding => 'utf-8')).result(binding)
  end

  def initialize(file, resource)
    raise ArgumentError, _("Template %{file} does not exist") % { file: file } unless Puppet::FileSystem.exist?(file)
    @file = file
    @resource = resource
  end

  private

  def set_resource_variables
    @resource.to_hash.each do |param, value|
      var = "@#{param}"
      instance_variable_set(var, value)
    end
  end
end