A custom Puppet function to create a copy of files in a path without desired extension. Path=./<module>/lib/puppet/parser/functions/copy_config_files.rb.

copy_config_files.rb

require 'find'
require 'fileutils'

module Puppet::Parser::Functions
  newfunction(:copy_config_files) do |args|
    function_notice(["Using copy_config_files script..."]) 
    ## Get all files with extension as follows
    config_files = []
    Find.find(args[1]) do |path|
      config_files << path if path =~ /.*\.template$/
    end ## End Find

    ## Validate or Copy files
    # Validate will check if file without extension exists
    # Copy will create a new file in the same path without extension
    case args[0]
    when 'copy' then
      config_files.each do |src_file|
        dest_file = src_file.sub(/\.template$/, '')
        FileUtils.copy(src_file, dest_file) unless File.exists?(dest_file)
        function_notice(["Creating: '#{dest_file}'"]) unless File.exists?(dest_file)
      end ## End Each

    when 'validate' then
      valid = true
      config_files.each do |org_file|
        new_file = org_file.sub(/\.template$/, '')
        valid = false unless File.exists?(new_file)
        function_notice(["Fail!: '#{new_file}'"]) unless File.exists?(new_file)
      end ## End Each
      raise Puppet::ParseError, "Error Validating copied files"

    else
      raise Puppet::ParseError, "You must to choose copy or validate as first argument"
    end ## End Case

  end ## End Function
end ## End Module