code: def clean_tarinfo(cls, tar_info):
          
          ti = copy(tar_info)
          ti.uid = 0
          ti.gid = 0
          ti.uname = ""
          ti.gname = ""
          ti.mode = normalize_file_permissions(ti.mode)
  
          return ti
docs: Clean metadata from a TarInfo object to make it more reproducible.
  
              - Set uid & gid to 0
              - Set uname and gname to ""
              - Normalise permissions to 644 or 755
              - Set mtime if not None