#!/usr/bin/python

import os
import sys
from portage import xpak

def usage():
        sys.stderr.write("usage: %s <tbz2_file>\n" % os.path.basename(sys.argv[0]))

def main():
        if len(sys.argv) != 2:
                usage()
                return 1

        input_file = sys.argv[1]

        if not os.path.isfile(input_file):
                usage()
                return 1

        output_file = input_file
        if output_file.endswith('.tbz2'):
                output_file = output_file[:-5]
        output_file += '.xpak'

        t = xpak.tbz2(input_file)
        t.scan()
        f = open(input_file, 'rb')
        f.seek(-t.xpaksize, 2)
        data = f.read()
        f.close()

        f = open(output_file, 'wb')
        f.write(data)
        f.close()
        return 0

if __name__ == '__main__':
        sys.exit(main())