class ChefCLI::Policyfile::UndoStack

def pop
  file_to_pop = undo_record_files.last
  if file_to_pop.nil?
    raise CantUndo, "No undo records exist in #{undo_dir}"
  end
  record = load_undo_record(file_to_pop)
  # if this hits an exception, we skip unlink
  yield record if block_given?
  File.unlink(file_to_pop)
  record
end