verify monkey-patch

gistfile1.rb

class Chef::Resource::File
  def verify(&block)
    if block_given?
      @verify_block=block
    else
      @verify_block
    end
  end
end

class Chef::Provider::File
  alias_method :old_dcc, :do_contents_changes
  def do_contents_changes
    do_verify if !@new_resource.verify.nil?
    old_dcc
  end

  def do_verify
    Chef::Log.debug "Validating rendered file"
    unless @new_resource.verify.call(tempfile.path)
      raise Chef::Exceptions::ValidationFailed, "Could not validate rendered file"
    end
  end
end