docs: def get_label_map(opts):
      ''' Find volume labels from filesystem and return in dict format. '''
      result = {}
      try:  # get labels from filesystem
          for entry in os.scandir(diskdir):
              if entry.name.startswith('.'):
                  continue
              if islink(entry.path):
                  target = os.readlink(entry.path)
              else:
                  target = entry.path
              result[target] = entry.name
          if opts.debug:
              print('\n\nlabel_map:', result)
      except FileNotFoundError:
          pass
  
      return result