code: def install_hwpack(url, replace_existing=False):
      
      d = tmpdir(tmpdir())
      f = download(url)
      Archive(f).extractall(d)
  
      clean_dir(d)
      src_dhwpack = find_hwpack_dir(d)
  
      targ_dhwpack = hwpack_dir() / src_dhwpack.name
      doaction = 0
      if targ_dhwpack.exists():
          log.debug('hwpack already exists: %s', targ_dhwpack)
          if replace_existing:
              log.debug('remove %s', targ_dhwpack)
              targ_dhwpack.rmtree()
              doaction = 1
      else:
          doaction = 1
  
      if doaction:
          log.debug('move %s -> %s', src_dhwpack, targ_dhwpack)
          src_dhwpack.move(targ_dhwpack)
  
          hwpack_dir().copymode(targ_dhwpack)
          for x in targ_dhwpack.walk():
              hwpack_dir().copymode(x)
docs: install hwpackrary from web or local files system.
  
      :param url: web address or file path
      :param replace_existing: bool
      :rtype: None