#! /usr/bin/env python
# vim: set fileencoding=utf-8 :
# Copyright (C) 2010 by Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

import re
import subprocess
import os
import sys

# This prevents including a timestamp in the .config which makes comparing a
# bit easier.
os.environ['KCONFIG_NOTIMESTAMP'] = 'Yes, please'

# XXX: get these using getopt
kernel_tree = '' # os.path.join(os.environ['HOME'], 'gsrc', 'linux-2.6')
arch = 'arm'
target = sys.argv[1]
defconfig_src = os.path.join(kernel_tree, 'arch/%s/configs/%s' % (arch, target))

subprocess.check_call(['make', '-s', 'ARCH=%s' % arch, target])
origconfig = list(open('.config'))
config = list(origconfig)
config_size = os.stat('.config').st_size

i = 0

while i < len(config):
    print 'test for %r' % config[i]
    defconfig = open(defconfig_src, 'w')
    defconfig.writelines(config[:i])
    defconfig.writelines(config[i + 1:])
    defconfig.close()
    subprocess.check_call(['make', '-s', 'ARCH=%s' % arch, target])
    if os.stat('.config').st_size == config_size and list(open('.config')) == origconfig:
        del config[i]
    else:
        i += 1

defconfig = open(defconfig_src, 'w')
defconfig.writelines(config)
defconfig.close()