#!/usr/bin/python3
 
 import os
 import pathlib
 import sys
 import urllib.request
 import io
 import tarfile
 
 
 DBURL = "https://freewvsdb.schokokeks.org/"
 dbpaths = ['/var/lib/freewvs/', str(pathlib.Path.home()) + "/.cache/freewvs/"]
 
 target = False
 for dbpath in dbpaths:
     if not os.path.isdir(dbpath):
         try:
             os.makedirs(dbpath)
         except PermissionError:
             continue
     if os.access(dbpath, os.W_OK):
         target = dbpath
         break
 
 if not target:
     sys.exit("Can't write to " + " or ".join(dbpaths))
 
 old = 0
 if os.path.isfile(target + "timestamp"):

     with open(target + "timestamp", encoding="ascii") as f:

         old = int(f.read())
 
 new = int(urllib.request.urlopen(DBURL + "freewvsdb.timestamp").read())
 
 if new == old:
     # nothing to do
     sys.exit()
 
 tarball = urllib.request.urlopen(DBURL + str(new) + ".tar.xz").read()
 
 tf = tarfile.open(fileobj=io.BytesIO(tarball))
 tf.extractall(path=target)

 with open(target + "timestamp", "w", encoding="ascii") as f:

     f.write(str(new))