code: def _active_mounts(ret):
      '''
      List active mounts on Linux systems
      '''
      _list = _list_mounts()
      filename = '/proc/self/mounts'
      if not os.access(filename, os.R_OK):
          msg = 'File not readable {0}'
          raise CommandExecutionError(msg.format(filename))
  
      with salt.utils.files.fopen(filename) as ifile:
          for line in ifile:
              comps = salt.utils.stringutils.to_unicode(line).split()
              ret[comps[1]] = {'device': comps[0],
                               'alt_device': _list.get(comps[1], None),
                               'fstype': comps[2],
                               'opts': _resolve_user_group_names(comps[3].split(','))}
      return ref _active_mounts(ret):
      '''
      List active mounts on Linux systems
      '''
      _list = _list_mounts()
      filename = '/proc/self/mounts'
      if not os.access(filename, os.R_OK):
          msg = 'File not readable {0}'
          raise CommandExecutionError(msg.format(filename))
  
      with salt.utils.files.fopen(filename) as ifile:
          for line in ifile:
              comps = salt.utils.stringutils.to_unicode(line).split()
              ret[comps[1]] = {'device': comps[0],
                               'alt_device': _list.get(comps[1], None),
                               'fstype': comps[2],
                               'opts': _resolve_user_group_names(comps[3].split(','))}
      return ret
docs: List active mounts on Linux systems