cef/tools/patch_updater.py

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# Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
# reserved. Use of this source code is governed by a BSD-style license that
# can be found in the LICENSE file.
from optparse import OptionParser
import os
import re
import sys
from exec_util import exec_cmd
import git_util as git
def msg(message):
""" Output a message. """
sys.stdout.write('--> ' + message + "\n")
def warn(message):
""" Output a warning. """
sys.stdout.write('-' * 80 + "\n")
sys.stdout.write('!!!! WARNING: ' + message + "\n")
sys.stdout.write('-' * 80 + "\n")
def extract_paths(file):
""" Extract the list of modified paths from the patch file. """
paths = []
fp = open(file)
for line in fp:
if line[:4] != '+++ ':
continue
match = re.match('^([^\t]+)', line[4:])
if not match:
continue
paths.append(match.group(1).strip())
return paths
# Cannot be loaded as a module.
if __name__ != "__main__":
sys.stderr.write('This file cannot be loaded as a module!')
sys.exit()
# Parse command-line options.
disc = """
This utility updates existing patch files.
"""
parser = OptionParser(description=disc)
parser.add_option('--resave',
action='store_true', dest='resave', default=False,
help='re-save existing patch files to pick up manual changes')
parser.add_option('--revert',
action='store_true', dest='revert', default=False,
help='revert all changes from existing patch files')
(options, args) = parser.parse_args()
if options.resave and options.revert:
print 'Invalid combination of options.'
parser.print_help(sys.stderr)
sys.exit()
# The CEF root directory is the parent directory of _this_ script.
cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
src_dir = os.path.join(cef_dir, os.pardir)
# Determine the type of Chromium checkout.
if not git.is_checkout(src_dir):
raise Exception('Not a valid checkout: %s' % src_dir)
patch_dir = os.path.join(cef_dir, 'patch')
patch_cfg = os.path.join(patch_dir, 'patch.cfg')
if not os.path.isfile(patch_cfg):
raise Exception('File does not exist: %s' % patch_cfg)
# Read the patch configuration file.
msg('Reading patch config %s' % patch_cfg)
scope = {}
execfile(patch_cfg, scope)
patches = scope["patches"]
# Read each individual patch file.
patches_dir = os.path.join(patch_dir, 'patches')
for patch in patches:
sys.stdout.write('\n')
patch_file = os.path.join(patches_dir, patch['name']+'.patch')
if os.path.isfile(patch_file):
msg('Reading patch file %s' % patch_file)
patch_root = patch['path']
patch_root_abs = os.path.abspath(os.path.join(cef_dir, patch_root))
# Retrieve the list of paths modified by the patch file.
patch_paths = extract_paths(patch_file)
# List of paths added by the patch file.
added_paths = []
if not options.resave:
# Revert any changes to existing files in the patch.
for patch_path in patch_paths:
patch_path_abs = os.path.abspath(os.path.join(patch_root_abs, \
patch_path))
if os.path.exists(patch_path_abs):
msg('Reverting changes to %s' % patch_path_abs)
cmd = 'git checkout -- %s' % (patch_path_abs)
result = exec_cmd(cmd, patch_root_abs)
if result['err'] != '':
msg('Failed to revert file: %s' % result['err'])
msg('Deleting file %s' % patch_path_abs)
os.remove(patch_path_abs)
added_paths.append(patch_path_abs)
if result['out'] != '':
sys.stdout.write(result['out'])
else:
msg('Skipping non-existing file %s' % patch_path_abs)
added_paths.append(patch_path_abs)
if not options.revert:
# Apply the patch file.
msg('Applying patch to %s' % patch_root_abs)
result = exec_cmd('patch -p0', patch_root_abs, patch_file)
if result['err'] != '':
raise Exception('Failed to apply patch file: %s' % result['err'])
sys.stdout.write(result['out'])
if result['out'].find('FAILED') != -1:
warn('Failed to apply %s, fix manually and run with --resave' % \
patch['name'])
continue
if not options.revert:
msg('Saving changes to %s' % patch_file)
if added_paths:
# Inform git of the added paths so they appear in the patch file.
cmd = 'git add -N %s' % ' '.join(added_paths)
result = exec_cmd(cmd, patch_root_abs)
if result['err'] != '' and result['err'].find('warning:') != 0:
raise Exception('Failed to add paths: %s' % result['err'])
# Re-create the patch file.
patch_paths_str = ' '.join(patch_paths)
cmd = 'git diff --no-prefix --relative %s' % patch_paths_str
result = exec_cmd(cmd, patch_root_abs)
if result['err'] != '' and result['err'].find('warning:') != 0:
raise Exception('Failed to create patch file: %s' % result['err'])
f = open(patch_file, 'wb')
f.write(result['out'])
f.close()
else:
raise Exception('Patch file does not exist: %s' % patch_file)