gecko-dev/build/subconfigure.py

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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# This script is used to capture the content of config.status-generated
# files and subsequently restore their timestamp if they haven't changed.
import os
import re
import subprocess
import sys
import pickle
class File(object):
def __init__(self, path):
self._path = path
self._content = open(path, 'rb').read()
stat = os.stat(path)
self._times = (stat.st_atime, stat.st_mtime)
def update_time(self):
'''If the file hasn't changed since the instance was created,
restore its old modification time.'''
if not os.path.exists(self._path):
return
if open(self._path, 'rb').read() == self._content:
os.utime(self._path, self._times)
# As defined in the various sub-configures in the tree
PRECIOUS_VARS = set([
'build_alias',
'host_alias',
'target_alias',
'CC',
'CFLAGS',
'LDFLAGS',
'LIBS',
'CPPFLAGS',
'CPP',
'CCC',
'CXXFLAGS',
'CXX',
'CCASFLAGS',
'CCAS',
])
# Autoconf, in some of the sub-configures used in the tree, likes to error
# out when "precious" variables change in value. The solution it gives to
# straighten things is to either run make distclean or remove config.cache.
# There's no reason not to do the latter automatically instead of failing,
# doing the cleanup (which, on buildbots means a full clobber), and
# restarting from scratch.
def maybe_clear_cache():
comment = re.compile(r'^\s+#')
cache = {}
with open('config.cache') as f:
for line in f.readlines():
if not comment.match(line) and '=' in line:
key, value = line.split('=', 1)
cache[key] = value
for precious in PRECIOUS_VARS:
entry = 'ac_cv_env_%s_value' % precious
if entry in cache and (not precious in os.environ or os.environ[precious] != cache[entry]):
os.remove('config.cache')
return
def dump(dump_file, shell):
if os.path.exists('config.cache'):
maybe_clear_cache()
if not os.path.exists('config.status'):
if os.path.exists(dump_file):
os.remove(dump_file)
return
config_files = [File('config.status')]
# Scan the config.status output for information about configuration files
# it generates.
config_status_output = subprocess.check_output(
[shell, '-c', './config.status --help'],
stderr=subprocess.STDOUT).splitlines()
state = None
for line in config_status_output:
if line.startswith('Configuration') and line.endswith(':'):
state = 'config'
elif not line.startswith(' '):
state = None
elif state == 'config':
for f in (couple.split(':')[0] for couple in line.split()):
if os.path.isfile(f):
config_files.append(File(f))
with open(dump_file, 'wb') as f:
pickle.dump(config_files, f)
def adjust(dump_file):
if not os.path.exists(dump_file):
return
config_files = []
try:
with open(dump_file, 'rb') as f:
config_files = pickle.load(f)
except Exception:
pass
for f in config_files:
f.update_time()
os.remove(dump_file)
CONFIG_DUMP = 'config_files.pkl'
if __name__ == '__main__':
if sys.argv[1] == 'dump':
dump(CONFIG_DUMP, sys.argv[2])
elif sys.argv[1] == 'adjust':
adjust(CONFIG_DUMP)