#!/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())