code: def contents_match(self, path):
          
          checksum = file_hash(path)
  
          kv = unitdata.kv()
          stored_checksum = kv.get('hardening:%s' % path)
          if not stored_checksum:
              # If the checksum hasn't been generated, return False to ensure
              # the file is written and the checksum stored.
              log('Checksum for %s has not been calculated.' % path, level=DEBUG)
              return False
          elif stored_checksum != checksum:
              log('Checksum mismatch for %s.' % path, level=DEBUG)
              return False
  
          return True
docs: Determines if the file content is the same.
  
          This is determined by comparing hashsum of the file contents and
          the saved hashsum. If there is no hashsum, then the content cannot
          be sure to be the same so treat them as if they are not the same.
          Otherwise, return True if the hashsums are the same, False if they
          are not the same.
  
          :param path: the file to check.