code: def add_string_as_file(self, content, filename, pred=None):
          
  
          # Generate summary string for logging
          summary = content.splitlines()[0] if content else ''
          if not isinstance(summary, six.string_types):
              summary = content.decode('utf8', 'ignore')
  
          if not self.test_predicate(cmd=False, pred=pred):
              self._log_info("skipped string ...'%s' due to predicate (%s)" %
                             (summary, self.get_predicate(pred=pred)))
              return
  
          self.copy_strings.append((content, filename))
          self._log_debug("added string ...'%s' as '%s'" % (summary, filename))
docs: Add a string to the archive as a file named `filename`