#! /usr/bin/env python

import os, re, subprocess, sys

silent = False

git_dir = os.path.join(os.getenv('HOME'), 'gsrc', 'linux-2.6', '.git')
os.putenv('GIT_DIR', git_dir)

devnull = open('/dev/null', 'w', 0)
if silent:
  subprocess_stdout = devnull
else:
  subprocess_stdout = None

if not silent:
  print 'fetch origin'
subprocess.call(['git-fetch', 'origin'], stdout=subprocess_stdout)

sp_describe = subprocess.Popen(['git-describe', 'origin'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
sp_describe_stdin, sp_describe_stderr = sp_describe.communicate()

re_linuxver = re.compile('v2\.6\.(?P<minor>\d+)(?P<stable>\.\d+)?(?P<rc>-rc\d+)?(?P<git>-g[0-9a-fA-F]+)?')
mo = re_linuxver.match(sp_describe_stdin)

if not mo:
  print 'cannot parse version of origin\'s HEAD'
  sys.exit(1)

modict = mo.groupdict()

if modict['rc'] and not modict['stable']:
  last_stable = int(modict['minor']) - 1
else:
  last_stable = int(modict['minor'])

for stable in (16, last_stable - 1, last_stable):
  if subprocess.call(['git', 'repo-config', 'remote.v2.6.%d.y.url' % stable], stdout=devnull) != 0:
    subprocess.call(['git', 'repo-config', 'remote.v2.6.%d.y.url' % stable, 'git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.%d.y.git' % stable])
    subprocess.call(['git', 'repo-config', 'remote.v2.6.%d.y.fetch' % stable, 'refs/heads/master:refs/remotes/stable/v2.6.%d.y' % stable])
    subprocess.call(['git', 'repo-config', 'branch.v2.6.%d.y.remote' % stable, 'v2.6.%d.y' % stable])
    subprocess.call(['git', 'repo-config', 'branch.v2.6.%d.y.remote' % stable, 'v2.6.%d.y' % stable])
    subprocess.call(['git', 'repo-config', 'branch.v2.6.%d.y.merge' % stable, 'refs/heads/master'])

  if not silent:
    print 'fetch v2.6.%d.y' % stable
  subprocess.call(['git-fetch', 'v2.6.%d.y' % stable], stdout=subprocess_stdout)