code: def concatenate_keyrings(args):
      
      keyring_path = os.path.abspath(args.keyrings)
      LOG.info('concatenating keyrings from %s' % keyring_path)
      LOG.info('to seed remote monitors')
  
      keyrings = [
          os.path.join(keyring_path, f) for f in os.listdir(keyring_path)
          if os.path.isfile(os.path.join(keyring_path, f)) and f.endswith('.keyring')
      ]
  
      contents = []
      seen_sections = {}
  
      if not keyrings:
          path_from_arg = os.path.abspath(args.keyrings)
          raise RuntimeError('could not find any keyrings in %s' % path_from_arg)
  
      for keyring in keyrings:
          path = os.path.abspath(keyring)
  
          for section in keyring_parser(path):
              if not seen_sections.get(section):
                  seen_sections[section] = path
                  LOG.info('adding entity "%s" from keyring %s' % (section, path))
                  with open(path) as k:
                      contents.append(k.read())
              else:
                  LOG.warning('will not add keyring: %s' % path)
                  LOG.warning('entity "%s" from keyring %s is a duplicate' % (section, path))
                  LOG.warning('already present in keyring: %s' % seen_sections[section])
  
      return ''.join(contents)
docs: A helper to collect all keyrings into a single blob that will be
      used to inject it to mons with ``--mkfs`` on remote nodes
  
      We require all keyring files to be concatenated to be in a directory
      to end with ``.keyring``.