# Based on 2a64387259cf14412e24c3267c8a1eb3b99a54e3

# 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 __future__ import absolute_import
from __future__ import print_function
import ast
from datetime import datetime
import json
from io import open
from optparse import OptionParser
import os
import re
import shlex
import shutil
import subprocess
import sys
import tempfile
import zipfile

is_python2 = sys.version_info.major == 2

if is_python2:
  from urllib import FancyURLopener
  from urllib2 import urlopen
else:
  from urllib.request import FancyURLopener, urlopen

##
# Default URLs.
##

depot_tools_url = 'https://chromium.googlesource.com/chromium/tools/depot_tools.git'
depot_tools_archive_url = 'https://storage.googleapis.com/chrome-infra/depot_tools.zip'

cef_git_url = 'https://bitbucket.org/chromiumembedded/cef.git'

chromium_channel_json_url = 'https://omahaproxy.appspot.com/all.json'

##
# Global system variables.
##

# Script directory.
script_dir = os.path.dirname(__file__)

##
# Helper functions.
##


def msg(message):
  """ Output a message. """
  sys.stdout.write('--> ' + message + "\n")


def run(command_line, working_dir, depot_tools_dir=None, output_file=None):
  """ Runs the specified command. """
  # add depot_tools to the path
  env = os.environ
  if not depot_tools_dir is None:
    env['PATH'] = depot_tools_dir + os.pathsep + env['PATH']

  sys.stdout.write('-------- Running "'+command_line+'" in "'+\
                   working_dir+'"...'+"\n")
  if not options.dryrun:
    args = shlex.split(command_line.replace('\\', '\\\\'))

    if not output_file:
      return subprocess.check_call(
          args, cwd=working_dir, env=env, shell=(sys.platform == 'win32'))
    try:
      msg('Writing %s' % output_file)
      with open(output_file, 'w', encoding='utf-8') as fp:
        return subprocess.check_call(
            args,
            cwd=working_dir,
            env=env,
            shell=(sys.platform == 'win32'),
            stderr=subprocess.STDOUT,
            stdout=fp)
    except subprocess.CalledProcessError:
      msg('ERROR Run failed. See %s for output.' % output_file)
      raise


def create_directory(path):
  """ Creates a directory if it doesn't already exist. """
  if not os.path.exists(path):
    msg("Creating directory %s" % (path))
    if not options.dryrun:
      os.makedirs(path)


def delete_directory(path):
  """ Removes an existing directory. """
  if os.path.exists(path):
    msg("Removing directory %s" % (path))
    if not options.dryrun:
      shutil.rmtree(path, onerror=onerror)


def copy_directory(source, target, allow_overwrite=False):
  """ Copies a directory from source to target. """
  if not options.dryrun and os.path.exists(target):
    if not allow_overwrite:
      raise Exception("Directory %s already exists" % (target))
    remove_directory(target)
  if os.path.exists(source):
    msg("Copying directory %s to %s" % (source, target))
    if not options.dryrun:
      shutil.copytree(source, target)


def move_directory(source, target, allow_overwrite=False):
  """ Copies a directory from source to target. """
  if not options.dryrun and os.path.exists(target):
    if not allow_overwrite:
      raise Exception("Directory %s already exists" % (target))
    remove_directory(target)
  if os.path.exists(source):
    msg("Moving directory %s to %s" % (source, target))
    if not options.dryrun:
      shutil.move(source, target)


def is_git_checkout(path):
  """ Returns true if the path represents a git checkout. """
  return os.path.exists(os.path.join(path, '.git'))


def exec_cmd(cmd, path):
  """ Execute the specified command and return the result. """
  out = ''
  err = ''
  sys.stdout.write("-------- Running \"%s\" in \"%s\"...\n" % (cmd, path))
  parts = cmd.split()
  try:
    process = subprocess.Popen(
        parts,
        cwd=path,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=(sys.platform == 'win32'))
    out, err = process.communicate()
  except IOError as e:
    (errno, strerror) = e.args
    raise
  except:
    raise
  return {'out': out.decode('utf-8'), 'err': err.decode('utf-8')}


def get_git_hash(path, branch):
  """ Returns the git hash for the specified branch/tag/hash. """
  cmd = "%s rev-parse %s" % (git_exe, branch)
  result = exec_cmd(cmd, path)
  if result['out'] != '':
    return result['out'].strip()
  return 'Unknown'


def get_git_date(path, branch):
  """ Returns the date for the specified branch/tag/hash. """
  cmd = "%s show -s --format=%%ct %s" % (git_exe, branch)
  result = exec_cmd(cmd, path)
  if result['out'] != '':
    return datetime.utcfromtimestamp(
        int(result['out'].strip())).strftime('%Y-%m-%d %H:%M:%S UTC')
  return 'Unknown'


def get_git_url(path):
  """ Returns the origin url for the specified path. """
  cmd = "%s config --get remote.origin.url" % (git_exe)
  result = exec_cmd(cmd, path)
  if result['out'] != '':
    return result['out'].strip()
  return 'Unknown'


def download_and_extract(src, target):
  """ Extracts the contents of src, which may be a URL or local file, to the
      target directory. """
  temporary = False

  if src[:4] == 'http':
    # Attempt to download a URL.
    opener = FancyURLopener({})
    response = opener.open(src)

    temporary = True
    handle, archive_path = tempfile.mkstemp(suffix='.zip')
    os.write(handle, response.read())
    os.close(handle)
  elif os.path.exists(src):
    # Use a local file.
    archive_path = src
  else:
    raise Exception('Path type is unsupported or does not exist: ' + src)

  if not zipfile.is_zipfile(archive_path):
    raise Exception('Not a valid zip archive: ' + src)

  # Attempt to extract the archive file.
  try:
    os.makedirs(target)
    zf = zipfile.ZipFile(archive_path, 'r')
    zf.extractall(target)
  except:
    shutil.rmtree(target, onerror=onerror)
    raise
  zf.close()

  # Delete the archive file if temporary.
  if temporary and os.path.exists(archive_path):
    os.remove(archive_path)


def read_file(path):
  """ Read a file. """
  if os.path.exists(path):
    with open(path, 'r', encoding='utf-8') as fp:
      return fp.read()
  else:
    raise Exception("Path does not exist: %s" % (path))


def write_fp(fp, data):
  if is_python2:
    fp.write(data.decode('utf-8'))
  else:
    fp.write(data)


def write_file(path, data):
  """ Write a file. """
  msg('Writing %s' % path)
  if not options.dryrun:
    with open(path, 'w', encoding='utf-8') as fp:
      write_fp(fp, data)


def read_config_file(path):
  """ Read a configuration file. """
  # Parse the contents.
  return ast.literal_eval(read_file(path))


def write_config_file(path, contents):
  """ Write a configuration file. """
  data = "{\n"
  for key in sorted(contents.keys()):
    data += "  '%s': '%s',\n" % (key, contents[key])
  data += "}\n"
  write_file(path, data)


def read_branch_config_file(path):
  """ Read the CEF branch from the specified path. """
  config_file = os.path.join(path, 'cef.branch')
  if os.path.isfile(config_file):
    contents = read_config_file(config_file)
    if 'branch' in contents:
      return contents['branch']
  return ''


def write_branch_config_file(path, branch):
  """ Write the CEF branch to the specified path. """
  config_file = os.path.join(path, 'cef.branch')
  if not os.path.isfile(config_file):
    write_config_file(config_file, {'branch': branch})


def apply_patch(name):
  patch_file = os.path.join(cef_dir, 'patch', 'patches', name)
  if os.path.exists(patch_file + ".patch"):
    # Attempt to apply the patch file.
    patch_tool = os.path.join(cef_dir, 'tools', 'patcher.py')
    run('%s %s --patch-file "%s" --patch-dir "%s"' %
        (python_exe, patch_tool, patch_file,
         chromium_src_dir), chromium_src_dir, depot_tools_dir)


def apply_deps_patch():
  """ Patch the Chromium DEPS file before `gclient sync` if necessary. """
  deps_path = os.path.join(chromium_src_dir, deps_file)
  if os.path.isfile(deps_path):
    msg("Chromium DEPS file: %s" % (deps_path))
    apply_patch(deps_file)
  else:
    raise Exception("Path does not exist: %s" % (deps_path))


def apply_runhooks_patch():
  """ Patch the Chromium runhooks files before `gclient runhooks` if necessary. """
  apply_patch('runhooks')


def run_patch_updater(args='', output_file=None):
  """ Run the patch updater script. """
  tool = os.path.join(cef_src_dir, 'tools', 'patch_updater.py')
  if len(args) > 0:
    args = ' ' + args
  run('%s %s%s' % (python_exe, tool, args), cef_src_dir, depot_tools_dir,
      output_file)


def replace_in_file(pattern, repl, path, count=0, flags=0):
  """ Replaces a RE pattern in a file. """
  with open(path, 'r') as fp:
    content = fp.read()
  content = re.sub(pattern, repl, content, count=count, flags=flags)
  with open(path, 'w') as fp:
    fp.write(content)


def apply_google_patch(name):
  # Root location of Google-specific patches.
  google_patch_path = os.path.abspath(
      os.path.join(os.path.dirname(__file__), '..', 'patch'))
  patch_file = os.path.join(google_patch_path, 'patches', name)
  if os.path.exists(patch_file + ".patch"):
    # Attempt to apply the patch file.
    patch_tool = os.path.join(cef_dir, 'tools', 'patcher.py')
    run('%s %s --patch-file "%s" --patch-dir "%s"' %
        (python_exe, patch_tool, patch_file,
         chromium_src_dir), chromium_src_dir, depot_tools_dir)


def add_google_patches():
  """ Hooks the build to also apply Google private patches to CEF. """
  # Root location of Google-specific patches.
  google_patch_path = os.path.abspath(
      os.path.join(os.path.dirname(__file__), '..', 'patch'))

  # Append a script to patch.cfg that will register Google-specific patches.
  # This file is a Python script, even though it has a .cfg extension. It sets
  # up a global list (`patches`) that contains information about each patch that
  # CEF applies during the build process. We append a script fragment to the end
  # of this file to extend the global list of patches with Google-specific ones.
  cef_patch_config_path = os.path.join(cef_dir, 'patch', 'patch.cfg')
  with open(cef_patch_config_path, 'a') as fp:
    fp.write(u"""
# Google-specific code starts here.
import os

# Location of Google-specific patches.
google_patch_path = %s
google_patch_config_file = os.path.join(google_patch_path, 'patch.cfg')

def register_google_patches(*args):
  for arg in args:
    # The CEF scripts that manipulate patches append .patch to 'name' and then
    # look for a file with that name in the CEF patches directory. However, if
    # 'name' is an absolute path, those scripts will look for a file at that
    # absolute path instead (after appending .patch to it). Since the Google-
    # specific patches are not in the CEF patches directory, prefix the
    # name here with google_patch_path (which is already an absolute path).
    arg['name'] = os.path.join(google_patch_path, 'patches', arg['name'])
    patches.append(arg)

# Execute the Google-specific patch config file in the current scope. The config
# file will call register_google_patches one or more times to register patches.
if os.path.isfile(google_patch_config_file):
  exec(compile(open(google_patch_config_file, 'rb').read(),
               google_patch_config_file, 'exec'))
# Google-specific code ends here.
""" % repr(google_patch_path))

  # Add new gclient hooks to run the make_version_header.py and translator.py
  # tools to generate a new CEF version header and a new CEF C API after
  # applying all patches. This is needed because the Google-specific patches may
  # change the version header or CEF API, but we do not want the patches to
  # themselves contain the updated version header or C API code. Including the
  # generated C API in particular in the patches would cause conflicts on every
  # CEF update because an API hash is generated and written into the generated
  # files.
  gclient_hook_path = os.path.join(cef_dir, 'tools', 'gclient_hook.py')
  new_gclient_hook = u"""# Google-specific code starts here.
print("\\\\nGenerating CEF version header file (again)...")
cmd = [
    'python', 'tools/make_version_header.py', 'include/cef_version.h'
]
RunAction(cef_dir, cmd)

print("\\\\nGenerating CAPI...")
cmd = ['python', 'tools/translator.py', '--root-dir', cef_dir]
RunAction(cef_dir, cmd)
# Google-specific code ends here.

"""
  replace_in_file(
      r'(?=^print\("\\nGenerating CEF project files\.\.\."\)$)',
      new_gclient_hook,
      gclient_hook_path,
      flags=re.MULTILINE)


def remove_google_patches():
  """ Unhooks the build to stop applying Google private patches to CEF. """
  pattern = re.compile(r'(\r?\n){,2}\# Google-specific code starts here\..*?'
                       r'^\# Google-specific code ends here\.',
                       flags=re.DOTALL | re.MULTILINE)

  cef_patch_config_path = os.path.join(cef_dir, 'patch', 'patch.cfg')
  replace_in_file(pattern, '', cef_patch_config_path)

  gclient_hook_path = os.path.join(cef_dir, 'tools', 'gclient_hook.py')
  replace_in_file(pattern, '', gclient_hook_path)


def onerror(func, path, exc_info):
  """
  Error handler for ``shutil.rmtree``.

  If the error is due to an access error (read only file)
  it attempts to add write permission and then retries.

  If the error is for another reason it re-raises the error.

  Usage : ``shutil.rmtree(path, onerror=onerror)``
  """
  import stat
  if not os.access(path, os.W_OK):
    # Is the error an access error ?
    os.chmod(path, stat.S_IWUSR)
    func(path)
  else:
    raise


def read_json_url(url):
  """ Read a JSON URL. """
  msg('Downloading %s' % url)
  return json.loads(urlopen(url).read())


g_channel_data = None


def get_chromium_channel_data(os, channel, param=None):
  """ Returns all data for the specified Chromium channel. """
  global g_channel_data

  if g_channel_data is None:
    g_channel_data = read_json_url(chromium_channel_json_url)
    assert len(g_channel_data) > 0, 'Failed to load Chromium channel data'

  for oses in g_channel_data:
    if oses['os'] == os:
      for version in oses['versions']:
        if version['channel'] == channel:
          assert version['os'] == os
          assert version['channel'] == channel
          if param is None:
            return version
          else:
            assert param in version, 'Missing parameter %s for Chromium channel %s %s' % (
                param, os, channel)
            return version[param]
      raise Exception("Invalid Chromium channel value: %s" % channel)
  raise Exception("Invalid Chromium os value: %s" % os)


def get_chromium_channel_commit(os, channel):
  """ Returns the current branch commit for the specified Chromium channel. """
  return get_chromium_channel_data(os, channel, 'branch_commit')


def get_chromium_channel_version(os, channel):
  """ Returns the current version for the specified Chromium channel. """
  return get_chromium_channel_data(os, channel, 'current_version')


def get_chromium_master_position(commit):
  """ Returns the closest master position for the specified Chromium commit. """
  # Using -2 because a "Publish DEPS" commit which does not have a master
  # position may be first.
  cmd = "%s log -2 %s" % (git_exe, commit)
  result = exec_cmd(cmd, chromium_src_dir)
  if result['out'] != '':
    match = re.search(r'refs/heads/master@{#([\d]+)}', result['out'])
    assert match != None, 'Failed to find position'
    return int(match.groups()[0])
  return None


def get_chromium_master_commit(position):
  """ Returns the master commit for the specified Chromium commit position. """
  cmd = '%s log -1 --grep=refs/heads/master@{#%s} origin/master' % (
      git_exe, str(position))
  result = exec_cmd(cmd, chromium_src_dir)
  if result['out'] != '':
    match = re.search(r'^commit ([a-f0-9]+)', result['out'])
    assert match != None, 'Failed to find commit'
    return match.groups()[0]
  return None


def get_chromium_versions(commit):
  """ Returns the list of Chromium versions that contain the specified commit.
      Versions are listed oldest to newest. """
  cmd = '%s tag --contains %s' % (git_exe, commit)
  result = exec_cmd(cmd, chromium_src_dir)
  if result['out'] != '':
    return [line.strip() for line in result['out'].strip().split('\n')]
  return None


def get_build_compat_versions():
  """ Returns the compatible Chromium and (optionally) depot_tools versions
      specified by the CEF checkout. """
  compat_path = os.path.join(cef_dir, 'CHROMIUM_BUILD_COMPATIBILITY.txt')
  msg("Reading %s" % compat_path)
  config = read_config_file(compat_path)

  if not 'chromium_checkout' in config:
    raise Exception("Missing chromium_checkout value in %s" % (compat_path))
  return config


def get_chromium_target_version(os='win', channel='canary', target_distance=0):
  """ Returns the target Chromium version based on a heuristic. """
  # The current compatible version from CEF.
  compat_version = chromium_compat_version
  compat_commit = get_git_hash(chromium_src_dir, compat_version)
  if compat_version == compat_commit:
    versions = get_chromium_versions(compat_commit)
    if len(versions) > 0:
      compat_version = 'refs/tags/' + versions[0]
      # Closest version may not align with the compat position, so adjust the
      # commit to match.
      compat_commit = get_git_hash(chromium_src_dir, compat_version)
  compat_position = get_chromium_master_position(compat_commit)
  compat_date = get_git_date(chromium_src_dir, compat_commit)

  # The most recent channel version from the Chromium website.
  channel_version = 'refs/tags/' + get_chromium_channel_version(os, channel)
  channel_commit = get_chromium_channel_commit(os, channel)
  channel_position = get_chromium_master_position(channel_commit)
  channel_date = get_git_date(chromium_src_dir, channel_commit)

  if compat_position >= channel_position:
    # Already compatible with the channel version or newer.
    target_version = compat_version
    target_commit = compat_commit
    target_position = compat_position
    target_date = compat_date
  elif target_distance <= 0 or compat_position + target_distance >= channel_position:
    # Channel version is within the target distance.
    target_version = channel_version
    target_commit = channel_commit
    target_position = channel_position
    target_date = channel_date
  else:
    # Find an intermediary version that's within the target distance.
    target_position = compat_position + target_distance
    target_commit = get_chromium_master_commit(target_position)
    versions = get_chromium_versions(target_commit)
    if len(versions) > 0:
      target_version = 'refs/tags/' + versions[0]
      # Closest version may not align with the target position, so adjust the
      # commit and position to match.
      target_commit = get_git_hash(chromium_src_dir, target_version)
      target_position = get_chromium_master_position(target_commit)
    else:
      target_version = target_commit
    target_date = get_git_date(chromium_src_dir, target_commit)

  msg("")
  msg("Computed Chromium update for %s %s at distance %d" % (os, channel,
                                                             target_distance))
  msg("Compat:  %s %s %s (#%d)" % (compat_date, compat_version, compat_commit,
                                   compat_position))
  msg("Target:  %s %s %s (#%d)" % (target_date, target_version, target_commit,
                                   target_position))
  msg("Channel: %s %s %s (#%d)" % (channel_date, channel_version,
                                   channel_commit, channel_position))
  msg("")

  return target_version


def get_build_directory_name(is_debug):
  build_dir = ('Debug' if is_debug else 'Release') + '_'

  # CEF uses a consistent directory naming scheme for GN via
  # GetAllPlatformConfigs in tools/gn_args.py.
  if options.x64build:
    build_dir += 'GN_x64'
  elif options.armbuild:
    build_dir += 'GN_arm'
  elif options.arm64build:
    build_dir += 'GN_arm64'
  else:
    build_dir += 'GN_x86'
  return build_dir


def read_update_file():
  update_path = os.path.join(cef_src_dir, 'CHROMIUM_UPDATE.txt')
  if not os.path.exists(update_path):
    msg("Missing file: %s" % update_path)
    return None

  msg("Reading %s" % update_path)
  return read_config_file(update_path)


def log_chromium_changes():
  """ Evaluate the Chromium checkout for changes. """
  config = read_update_file()
  if config is None:
    msg("Skipping Chromium changes log.")
    return

  if 'files' in config:
    out_file = os.path.join(download_dir, 'chromium_update_changes.diff')
    if os.path.exists(out_file):
      os.remove(out_file)

    old_commit = get_chromium_master_commit(
        get_chromium_master_position(chromium_compat_version))
    new_commit = get_chromium_master_commit(
        get_chromium_master_position(chromium_checkout))

    cmd = '%s diff --relative --no-prefix %s..%s -- %s' % (
        git_exe, old_commit, new_commit, ' '.join(config['files']))
    result = exec_cmd(cmd, chromium_src_dir)
    if result['out'] != '':
      write_file(out_file, result['out'])


def check_pattern_matches(output_file=None):
  """ Evaluate the Chromium checkout for pattern matches. """
  config = read_update_file()
  if config is None:
    msg("Skipping Chromium pattern matching.")
    return

  if 'patterns' in config:
    if output_file is None:
      fp = sys.stdout
    else:
      msg('Writing %s' % output_file)
      fp = open(output_file, 'w', encoding='utf-8')

    has_output = False
    for entry in config['patterns']:
      msg("Evaluating pattern: %s" % entry['pattern'])

      # Read patterns from a file to avoid formatting problems.
      pattern_handle, pattern_file = tempfile.mkstemp()
      os.write(pattern_handle, entry['pattern'])
      os.close(pattern_handle)

      cmd = '%s grep -n -f %s' % (git_exe, pattern_file)
      result = exec_cmd(cmd, chromium_src_dir)
      os.remove(pattern_file)

      if result['out'] != '':
        write_msg = True
        re_exclude = re.compile(
            entry['exclude_matches']) if 'exclude_matches' in entry else None

        for line in result['out'].split('\n'):
          line = line.strip()
          if len(line) == 0:
            continue
          skip = not re_exclude is None and re_exclude.match(line) != None
          if not skip:
            if write_msg:
              if has_output:
                write_fp(fp, '\n')
              write_fp(fp,
                       '!!!! WARNING: FOUND PATTERN: %s\n' % entry['pattern'])
              if 'message' in entry:
                write_fp(fp, entry['message'] + '\n')
              write_fp(fp, '\n')
              write_msg = False
            write_fp(fp, line + '\n')
            has_output = True

    if not output_file is None:
      if has_output:
        msg('ERROR Matches found. See %s for output.' % out_file)
      else:
        write_fp(fp, 'Good news! No matches.\n')
      fp.close()

    if has_output:
      # Don't continue when we know the build will be wrong.
      sys.exit(1)


##
# Program entry point.
##

# 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 implements automation for the download, update, build and
distribution of CEF.
"""

parser = OptionParser(description=disc)

# Setup options.
parser.add_option(
    '--download-dir',
    dest='downloaddir',
    metavar='DIR',
    help='Download directory with no spaces [required].')
parser.add_option(
    '--depot-tools-dir',
    dest='depottoolsdir',
    metavar='DIR',
    help='Download directory for depot_tools.',
    default='')
parser.add_option('--depot-tools-archive', dest='depottoolsarchive',
                  help='Zip archive file that contains a single top-level '+\
                       'depot_tools directory.', default='')
parser.add_option('--branch', dest='branch',
                  help='Branch of CEF to build (master, 3987, ...). This '+\
                       'will be used to name the CEF download directory and '+\
                       'to identify the correct URL if --url is not '+\
                       'specified. The default value is master.',
                  default='master')
parser.add_option('--url', dest='url',
                  help='CEF download URL. If not specified the default URL '+\
                       'will be used.',
                  default='')
parser.add_option('--chromium-url', dest='chromiumurl',
                  help='Chromium download URL. If not specified the default '+\
                       'URL will be used.',
                  default='')
parser.add_option('--checkout', dest='checkout',
                  help='Version of CEF to checkout. If not specified the '+\
                       'most recent remote version of the branch will be used.',
                  default='')
parser.add_option('--chromium-checkout', dest='chromiumcheckout',
                  help='Version of Chromium to checkout (Git '+\
                       'branch/hash/tag). This overrides the value specified '+\
                       'by CEF in CHROMIUM_BUILD_COMPATIBILITY.txt.',
                  default='')
parser.add_option('--chromium-channel', dest='chromiumchannel',
                  help='Chromium channel to check out (canary, dev, beta or '+\
                       'stable). This overrides the value specified by CEF '+\
                       'in CHROMIUM_BUILD_COMPATIBILITY.txt.',
                  default='')
parser.add_option('--chromium-channel-distance', dest='chromiumchanneldistance',
                  help='The target number of commits to step in the '+\
                       'channel, or 0 to use the newest channel version. '+\
                       'Used in combination with --chromium-channel.',
                  default='')

# Miscellaneous options.
parser.add_option(
    '--force-config',
    action='store_true',
    dest='forceconfig',
    default=False,
    help='Force creation of a new gclient config file.')
parser.add_option('--force-clean',
                  action='store_true', dest='forceclean', default=False,
                  help='Force a clean checkout of Chromium and CEF. This will'+\
                       ' trigger a new update, build and distribution.')
parser.add_option('--force-clean-deps',
                  action='store_true', dest='forcecleandeps', default=False,
                  help='Force a clean checkout of Chromium dependencies. Used'+\
                       ' in combination with --force-clean.')
parser.add_option(
    '--dry-run',
    action='store_true',
    dest='dryrun',
    default=False,
    help="Output commands without executing them.")
parser.add_option('--dry-run-platform', dest='dryrunplatform', default=None,
                  help='Simulate a dry run on the specified platform '+\
                       '(windows, mac, linux). Must be used in combination'+\
                       ' with the --dry-run flag.')

# Update-related options.
parser.add_option('--force-update',
                  action='store_true', dest='forceupdate', default=False,
                  help='Force a Chromium and CEF update. This will trigger a '+\
                       'new build and distribution.')
parser.add_option('--no-update',
                  action='store_true', dest='noupdate', default=False,
                  help='Do not update Chromium or CEF. Pass --force-build or '+\
                       '--force-distrib if you desire a new build or '+\
                       'distribution.')
parser.add_option('--no-cef-update',
                  action='store_true', dest='nocefupdate', default=False,
                  help='Do not update CEF. Pass --force-build or '+\
                       '--force-distrib if you desire a new build or '+\
                       'distribution.')
parser.add_option('--force-cef-update',
                  action='store_true', dest='forcecefupdate', default=False,
                  help='Force a CEF update. This will cause local changes in '+\
                       'the CEF checkout to be discarded and patch files to '+\
                       'be reapplied.')
parser.add_option(
    '--no-chromium-update',
    action='store_true',
    dest='nochromiumupdate',
    default=False,
    help='Do not update Chromium.')
parser.add_option(
    '--no-depot-tools-update',
    action='store_true',
    dest='nodepottoolsupdate',
    default=False,
    help='Do not update depot_tools.')
parser.add_option(
    '--install-build-deps',
    action='store_true',
    dest='installbuilddeps',
    default=False,
    help='Install build dependencies on platforms that support this.')
parser.add_option('--fast-update',
                  action='store_true', dest='fastupdate', default=False,
                  help='Update existing Chromium/CEF checkouts for fast incremental '+\
                       'builds by attempting to minimize the number of modified files. '+\
                       'The update will fail if there are unstaged CEF changes or if '+\
                       'Chromium changes are not included in a patch file.')
parser.add_option(
    '--force-patch-update',
    action='store_true',
    dest='forcepatchupdate',
    default=False,
    help='Force update of patch files.')
parser.add_option(
    '--resave',
    action='store_true',
    dest='resave',
    default=False,
    help='Resave patch files.')
parser.add_option(
    '--log-chromium-changes',
    action='store_true',
    dest='logchromiumchanges',
    default=False,
    help='Create a log of the Chromium changes.')

# Build-related options.
parser.add_option('--force-build',
                  action='store_true', dest='forcebuild', default=False,
                  help='Force CEF debug and release builds. This builds '+\
                       '[build-target] on all platforms and chrome_sandbox '+\
                       'on Linux.')
parser.add_option(
    '--no-build',
    action='store_true',
    dest='nobuild',
    default=False,
    help='Do not build CEF.')
parser.add_option(
    '--build-target',
    dest='buildtarget',
    default='cefclient',
    help='Target name(s) to build (defaults to "cefclient").')
parser.add_option(
    '--build-tests',
    action='store_true',
    dest='buildtests',
    default=False,
    help='Also build the test target specified via --test-target.')
parser.add_option(
    '--no-debug-build',
    action='store_true',
    dest='nodebugbuild',
    default=False,
    help="Don't perform the CEF debug build.")
parser.add_option(
    '--no-release-build',
    action='store_true',
    dest='noreleasebuild',
    default=False,
    help="Don't perform the CEF release build.")
parser.add_option(
    '--verbose-build',
    action='store_true',
    dest='verbosebuild',
    default=False,
    help='Show all command lines while building.')
parser.add_option(
    '--build-failure-limit',
    dest='buildfailurelimit',
    default=1,
    type="int",
    help='Keep going until N jobs fail.')
parser.add_option('--build-log-file',
                  action='store_true', dest='buildlogfile', default=False,
                  help='Write build logs to file. The file will be named '+\
                       '"build-[branch]-[debug|release].log" in the download '+\
                       'directory.')
parser.add_option(
    '--x64-build',
    action='store_true',
    dest='x64build',
    default=False,
    help='Create a 64-bit build.')
parser.add_option(
    '--arm-build',
    action='store_true',
    dest='armbuild',
    default=False,
    help='Create an ARM build.')
parser.add_option(
    '--arm64-build',
    action='store_true',
    dest='arm64build',
    default=False,
    help='Create an ARM64 build.')

# Test-related options.
parser.add_option(
    '--run-tests',
    action='store_true',
    dest='runtests',
    default=False,
    help='Run the ceftests target.')
parser.add_option(
    '--no-debug-tests',
    action='store_true',
    dest='nodebugtests',
    default=False,
    help="Don't run debug build tests.")
parser.add_option(
    '--no-release-tests',
    action='store_true',
    dest='noreleasetests',
    default=False,
    help="Don't run release build tests.")
parser.add_option(
    '--test-target',
    dest='testtarget',
    default='ceftests',
    help='Test target name to build (defaults to "ceftests").')
parser.add_option(
    '--test-prefix',
    dest='testprefix',
    default='',
    help='Prefix for running the test executable (e.g. `xvfb-run` on Linux).')
parser.add_option(
    '--test-args',
    dest='testargs',
    default='',
    help='Arguments that will be passed to the test executable.')

# Distribution-related options.
parser.add_option(
    '--force-distrib',
    action='store_true',
    dest='forcedistrib',
    default=False,
    help='Force creation of a CEF binary distribution.')
parser.add_option(
    '--no-distrib',
    action='store_true',
    dest='nodistrib',
    default=False,
    help="Don't create a CEF binary distribution.")
parser.add_option(
    '--minimal-distrib',
    action='store_true',
    dest='minimaldistrib',
    default=False,
    help='Create a minimal CEF binary distribution.')
parser.add_option(
    '--minimal-distrib-only',
    action='store_true',
    dest='minimaldistribonly',
    default=False,
    help='Create a minimal CEF binary distribution only.')
parser.add_option(
    '--client-distrib',
    action='store_true',
    dest='clientdistrib',
    default=False,
    help='Create a client CEF binary distribution.')
parser.add_option(
    '--client-distrib-only',
    action='store_true',
    dest='clientdistribonly',
    default=False,
    help='Create a client CEF binary distribution only.')
parser.add_option(
    '--sandbox-distrib',
    action='store_true',
    dest='sandboxdistrib',
    default=False,
    help='Create a cef_sandbox static library distribution.')
parser.add_option(
    '--sandbox-distrib-only',
    action='store_true',
    dest='sandboxdistribonly',
    default=False,
    help='Create a cef_sandbox static library distribution only.')
parser.add_option(
    '--no-distrib-docs',
    action='store_true',
    dest='nodistribdocs',
    default=False,
    help="Don't create CEF documentation.")
parser.add_option(
    '--no-distrib-archive',
    action='store_true',
    dest='nodistribarchive',
    default=False,
    help="Don't create archives for output directories.")
parser.add_option(
    '--clean-artifacts',
    action='store_true',
    dest='cleanartifacts',
    default=False,
    help='Clean the artifacts output directory.')
parser.add_option(
    '--distrib-subdir',
    dest='distribsubdir',
    default='',
    help='CEF distrib dir name, child of chromium/src/cef/binary_distrib')
parser.add_option(
    '--distrib-subdir-suffix',
    dest='distribsubdirsuffix',
    default='',
    help='CEF distrib dir name suffix, child of chromium/src/cef/binary_distrib'
)

(options, args) = parser.parse_args()

if options.downloaddir is None:
  print("The --download-dir option is required.")
  parser.print_help(sys.stderr)
  sys.exit()

# Opt into component-specific flags for later use.
if options.noupdate:
  options.nocefupdate = True
  options.nochromiumupdate = True
  options.nodepottoolsupdate = True

if options.runtests:
  options.buildtests = True

if (options.nochromiumupdate and options.forceupdate) or \
   (options.nocefupdate and options.forceupdate) or \
   (options.nobuild and options.forcebuild) or \
   (options.nodistrib and options.forcedistrib) or \
   ((options.forceclean or options.forcecleandeps) and options.fastupdate) or \
   (options.chromiumcheckout and options.chromiumchannel):
  print("Invalid combination of options.")
  parser.print_help(sys.stderr)
  sys.exit()

if (options.noreleasebuild and \
     (options.minimaldistrib or options.minimaldistribonly or \
      options.clientdistrib or options.clientdistribonly)) or \
   (options.minimaldistribonly + options.clientdistribonly + options.sandboxdistribonly > 1):
  print('Invalid combination of options.')
  parser.print_help(sys.stderr)
  sys.exit()

if options.x64build + options.armbuild + options.arm64build > 1:
  print('Invalid combination of options.')
  parser.print_help(sys.stderr)
  sys.exit()

if (options.buildtests or options.runtests) and len(options.testtarget) == 0:
  print("A test target must be specified via --test-target.")
  parser.print_help(sys.stderr)
  sys.exit()

# Operating system.
if options.dryrun and options.dryrunplatform is not None:
  platform = options.dryrunplatform
  if not platform in ['windows', 'mac', 'linux']:
    print('Invalid dry-run-platform value: %s' % (platform))
    sys.exit()
elif sys.platform == 'win32':
  platform = 'windows'
elif sys.platform == 'darwin':
  platform = 'mac'
elif sys.platform.startswith('linux'):
  platform = 'linux'
else:
  print('Unknown operating system platform')
  sys.exit()

if options.clientdistrib or options.clientdistribonly:
  if platform == 'linux':
    client_app = 'cefsimple'
  else:
    client_app = 'cefclient'
  if options.buildtarget.find(client_app) == -1:
    print('A client distribution cannot be generated if --build-target ' +
          'excludes %s.' % client_app)
    parser.print_help(sys.stderr)
    sys.exit()

# CEF branch.
cef_branch = options.branch

branch_is_master = (cef_branch == 'master' or cef_branch == 'trunk')
if not branch_is_master:
  # Verify that the branch value is numeric.
  if not cef_branch.isdigit():
    print('Invalid branch value: %s' % cef_branch)
    sys.exit()

  # Verify the minimum supported branch number.
  if int(cef_branch) < 3071:
    print('The requested branch (%s) is too old to build using this tool. ' +
          'The minimum supported branch is 3071.' % cef_branch)
    sys.exit()

# True if the requested branch is 3538 or newer.
branch_is_3538_or_newer = (branch_is_master or int(cef_branch) >= 3538)

# True if the requested branch is 3945 or newer.
branch_is_3945_or_newer = (branch_is_master or int(cef_branch) >= 3945)

# Enable Python 3 usage in Chromium for branches 3945 and newer.
if branch_is_3945_or_newer and not is_python2 and \
    not 'GCLIENT_PY3' in os.environ.keys():
  os.environ['GCLIENT_PY3'] = '1'

if not branch_is_3945_or_newer and \
  (not is_python2 or bool(int(os.environ.get('GCLIENT_PY3', '0')))):
  print('Python 3 is not supported with branch 3904 and older ' +
        '(set GCLIENT_PY3=0 and run with Python 2 executable).')
  sys.exit()

if options.armbuild:
  if platform != 'linux':
    print('The ARM build option is only supported on Linux.')
    sys.exit()

deps_file = 'DEPS'

if platform == 'mac' and not (options.x64build or options.arm64build):
  print('32-bit MacOS builds are not supported. ' +
        'Add --x64-build or --arm64-build flag to generate a 64-bit build.')
  sys.exit()

# Platforms that build a cef_sandbox library.
sandbox_lib_platforms = ['windows']
if branch_is_3538_or_newer:
  sandbox_lib_platforms.append('mac')

if not platform in sandbox_lib_platforms and (options.sandboxdistrib or
                                              options.sandboxdistribonly):
  print('The sandbox distribution is not supported on this platform.')
  sys.exit()

# Options that force the sources to change.
force_change = options.forceclean or options.forceupdate

# Options that cause local changes to be discarded.
discard_local_changes = force_change or options.forcecefupdate

if options.resave and (options.forcepatchupdate or discard_local_changes):
  print('--resave cannot be combined with options that modify or discard ' +
        'patches.')
  parser.print_help(sys.stderr)
  sys.exit()

download_dir = os.path.abspath(options.downloaddir)
chromium_dir = os.path.join(download_dir, 'chromium')
chromium_src_dir = os.path.join(chromium_dir, 'src')
out_src_dir = os.path.join(chromium_src_dir, 'out')
cef_src_dir = os.path.join(chromium_src_dir, 'cef')

if options.fastupdate and os.path.exists(cef_src_dir):
  cef_dir = cef_src_dir
else:
  cef_dir = os.path.join(download_dir, 'cef')

##
# Manage the download directory.
##

# Create the download directory if necessary.
create_directory(download_dir)

msg("Download Directory: %s" % (download_dir))

##
# Manage the depot_tools directory.
##

# Check if the depot_tools directory exists.
if options.depottoolsdir != '':
  depot_tools_dir = os.path.abspath(options.depottoolsdir)
else:
  depot_tools_dir = os.path.join(download_dir, 'depot_tools')

msg("Depot Tools Directory: %s" % (depot_tools_dir))

if not os.path.exists(depot_tools_dir):
  if platform == 'windows' and options.depottoolsarchive == '':
    # On Windows download depot_tools as an archive file since we can't assume
    # that git is already installed.
    options.depottoolsarchive = depot_tools_archive_url

  if options.depottoolsarchive != '':
    # Extract depot_tools from an archive file.
    msg('Extracting %s to %s.' % \
        (options.depottoolsarchive, depot_tools_dir))
    if not options.dryrun:
      download_and_extract(options.depottoolsarchive, depot_tools_dir)
  else:
    # On Linux and OS X check out depot_tools using Git.
    run('git clone ' + depot_tools_url + ' ' + depot_tools_dir, download_dir)

if not options.nodepottoolsupdate:
  # Update depot_tools.
  # On Windows this will download required python and git binaries.
  msg('Updating depot_tools')
  if platform == 'windows':
    run('update_depot_tools.bat', depot_tools_dir, depot_tools_dir)
  else:
    run('update_depot_tools', depot_tools_dir, depot_tools_dir)

# Determine the executables to use.
if platform == 'windows':
  # Force use of the version bundled with depot_tools.
  git_exe = os.path.join(depot_tools_dir, 'git.bat')
  python_bat = 'python.bat' if is_python2 else 'python3.bat'
  python_exe = os.path.join(depot_tools_dir, python_bat)
  if options.dryrun and not os.path.exists(git_exe):
    sys.stdout.write("WARNING: --dry-run assumes that depot_tools" \
                     " is already in your PATH. If it isn't\nplease" \
                     " specify a --depot-tools-dir value.\n")
    git_exe = 'git.bat'
    python_exe = python_bat
else:
  git_exe = 'git'
  python_exe = sys.executable

##
# Manage the cef directory.
##

# Delete the existing CEF directory if requested.
if options.forceclean and os.path.exists(cef_dir):
  delete_directory(cef_dir)

# Determine the type of CEF checkout to use.
if os.path.exists(cef_dir) and not is_git_checkout(cef_dir):
  raise Exception("Not a valid CEF Git checkout: %s" % (cef_dir))

# Determine the CEF download URL to use.
cef_url = options.url.strip()
if cef_url == '':
  cef_url = cef_git_url

# Verify that the requested CEF URL matches the existing checkout.
if not options.nocefupdate and os.path.exists(cef_dir):
  cef_existing_url = get_git_url(cef_dir)
  if cef_url != cef_existing_url:
    raise Exception(
        'Requested CEF checkout URL %s does not match existing URL %s' %
        (cef_url, cef_existing_url))

msg("CEF Branch: %s" % (cef_branch))
msg("CEF URL: %s" % (cef_url))
msg("CEF Source Directory: %s" % (cef_dir))

# Determine the CEF Git branch to use.
if options.checkout == '':
  # Target the most recent branch commit from the remote repo.
  if branch_is_master:
    cef_checkout = 'origin/master'
  else:
    cef_checkout = 'origin/' + cef_branch
else:
  cef_checkout = options.checkout

# Create the CEF checkout if necessary.
if not options.nocefupdate and not os.path.exists(cef_dir):
  cef_checkout_new = True
  run(
      '%s clone --config core.autocrlf=false %s %s' %
      (git_exe, cef_url, cef_dir), download_dir, depot_tools_dir)
  add_google_patches()
else:
  cef_checkout_new = False

# Determine if the CEF checkout needs to change.
if not options.nocefupdate and os.path.exists(cef_dir):
  cef_current_hash = get_git_hash(cef_dir, 'HEAD')

  if not cef_checkout_new:
    # Fetch updated sources.
    run('%s fetch' % (git_exe), cef_dir, depot_tools_dir)

  cef_desired_hash = get_git_hash(cef_dir, cef_checkout)
  cef_checkout_changed = cef_checkout_new or force_change or \
                         options.forcecefupdate or \
                         cef_current_hash != cef_desired_hash

  msg("CEF Current Checkout: %s" % (cef_current_hash))
  msg("CEF Desired Checkout: %s (%s)" % (cef_desired_hash, cef_checkout))

  if cef_checkout_changed:
    if cef_dir == cef_src_dir:
      # Running in fast update mode. Backup and revert the patched files before
      # changing the CEF checkout.
      run_patch_updater("--backup --revert")

    # Unregister Google-specific patches so that checkout can succeed.
    remove_google_patches()

    # Update the CEF checkout.
    run('%s checkout %s%s' %
      (git_exe, '--force ' if discard_local_changes else '', cef_checkout), \
      cef_dir, depot_tools_dir)

    # Reregister Google-specific patches.
    add_google_patches()
else:
  cef_checkout_changed = False

build_compat_versions = get_build_compat_versions()

if not options.nodepottoolsupdate and \
    'depot_tools_checkout' in build_compat_versions:
  # Update the depot_tools checkout.
  depot_tools_compat_version = build_compat_versions['depot_tools_checkout']
  run('%s checkout %s%s' %
      (git_exe, '--force ' if discard_local_changes else '', depot_tools_compat_version), \
      depot_tools_dir, depot_tools_dir)

# Disable further depot_tools updates.
os.environ['DEPOT_TOOLS_UPDATE'] = '0'

##
# Manage the out directory.
##

out_dir = os.path.join(download_dir, 'out_' + cef_branch)

# Delete the existing out directory if requested.
if options.forceclean and os.path.exists(out_dir):
  delete_directory(out_dir)

msg("CEF Output Directory: %s" % (out_dir))

##
# Manage the chromium directory.
##

# Create the chromium directory if necessary.
create_directory(chromium_dir)

if options.chromiumurl != '':
  chromium_url = options.chromiumurl
else:
  chromium_url = 'https://chromium.googlesource.com/chromium/src.git'

# Create gclient configuration file.
gclient_file = os.path.join(chromium_dir, '.gclient')
if not os.path.exists(gclient_file) or options.forceconfig:
  # Exclude unnecessary directories. Intentionally written without newlines.
  gclient_spec = \
      "solutions = [{"+\
        "'managed': False,"+\
        "'name': 'src', "+\
        "'url': '" + chromium_url + "', "+\
        "'custom_deps': {"+\
          "'build': None, "+\
          "'build/scripts/command_wrapper/bin': None, "+\
          "'build/scripts/gsd_generate_index': None, "+\
          "'build/scripts/private/data/reliability': None, "+\
          "'build/scripts/tools/deps2git': None, "+\
          "'build/third_party/lighttpd': None, "+\
          "'commit-queue': None, "+\
          "'depot_tools': None, "+\
          "'src/chrome_frame/tools/test/reference_build/chrome': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_linux': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_mac': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_win': None, "+\
        "}, "+\
        "'deps_file': '" + deps_file + "', "+\
        "'safesync_url': ''"+\
      "}]"

  msg('Writing %s' % gclient_file)
  if not options.dryrun:
    with open(gclient_file, 'w', encoding='utf-8') as fp:
      write_fp(fp, gclient_spec)

# Initial Chromium checkout.
if not options.nochromiumupdate and not os.path.exists(chromium_src_dir):
  chromium_checkout_new = True
  run("gclient sync --nohooks --with_branch_heads --jobs 16", \
      chromium_dir, depot_tools_dir)
else:
  chromium_checkout_new = False

# Verify the Chromium checkout.
if not options.dryrun and not is_git_checkout(chromium_src_dir):
  raise Exception('Not a valid git checkout: %s' % (chromium_src_dir))

if os.path.exists(chromium_src_dir):
  msg("Chromium URL: %s" % (get_git_url(chromium_src_dir)))

# Fetch Chromium changes so that we can perform the necessary calculations using
# local history.
if not options.nochromiumupdate and os.path.exists(chromium_src_dir):
  # Fetch updated sources.
  run("%s fetch" % (git_exe), chromium_src_dir, depot_tools_dir)
  # Also fetch tags, which are required for release branch builds.
  run("%s fetch --tags" % (git_exe), chromium_src_dir, depot_tools_dir)

# Determine the Chromium checkout options required by CEF.
chromium_compat_version = build_compat_versions['chromium_checkout']
if len(options.chromiumcheckout) > 0:
  chromium_checkout = options.chromiumcheckout
elif len(options.chromiumchannel) > 0:
  target_distance = int(options.chromiumchanneldistance
                       ) if len(options.chromiumchanneldistance) > 0 else 0
  chromium_checkout = get_chromium_target_version(
      channel=options.chromiumchannel, target_distance=target_distance)
else:
  chromium_checkout = chromium_compat_version

# Determine if the Chromium checkout needs to change.
if not options.nochromiumupdate and os.path.exists(chromium_src_dir):
  chromium_current_hash = get_git_hash(chromium_src_dir, 'HEAD')
  chromium_desired_hash = get_git_hash(chromium_src_dir, chromium_checkout)
  chromium_checkout_changed = chromium_checkout_new or force_change or \
                              chromium_current_hash != chromium_desired_hash

  msg("Chromium Current Checkout: %s" % (chromium_current_hash))
  msg("Chromium Desired Checkout: %s (%s)" % \
      (chromium_desired_hash, chromium_checkout))
else:
  chromium_checkout_changed = options.dryrun

if cef_checkout_changed:
  if cef_dir != cef_src_dir and os.path.exists(cef_src_dir):
    # Delete the existing src/cef directory. It will be re-copied from the
    # download directory later.
    delete_directory(cef_src_dir)
elif chromium_checkout_changed and cef_dir == cef_src_dir:
  # Running in fast update mode. Backup and revert the patched files before
  # changing the Chromium checkout.
  run_patch_updater("--backup --revert")

# Delete the existing src/out directory if requested.
if options.forceclean and os.path.exists(out_src_dir):
  delete_directory(out_src_dir)

# Move the existing src/out directory to the correct location in the download
# directory. It will be moved back from the download directory later.
if os.path.exists(out_src_dir):
  old_branch = read_branch_config_file(out_src_dir)
  if old_branch != '' and (chromium_checkout_changed or
                           old_branch != cef_branch):
    old_out_dir = os.path.join(download_dir, 'out_' + old_branch)
    move_directory(out_src_dir, old_out_dir)

# Update the Chromium checkout.
if chromium_checkout_changed:
  if not chromium_checkout_new and not options.fastupdate:
    if options.forceclean and options.forcecleandeps:
      # Remove all local changes including third-party git checkouts managed by
      # gclient.
      run("%s clean -dffx" % (git_exe), chromium_src_dir, depot_tools_dir)
    else:
      # Revert all changes in the Chromium checkout.
      run("gclient revert --nohooks", chromium_dir, depot_tools_dir)

  # Checkout the requested branch.
  run("%s checkout %s%s" % \
    (git_exe, '--force ' if discard_local_changes else '', chromium_checkout), \
    chromium_src_dir, depot_tools_dir)

  # Patch the Chromium DEPS file if necessary.
  apply_deps_patch()

  # Update third-party dependencies including branch/tag information.
  run("gclient sync %s--nohooks --with_branch_heads --jobs 16" % \
      ('--reset ' if discard_local_changes else ''), chromium_dir, depot_tools_dir)

  # Patch the Chromium runhooks scripts if necessary.
  apply_runhooks_patch()
  apply_google_patch('mac_toolchain_creds')

  # Runs hooks for files that have been modified in the local working copy.
  run("gclient runhooks --jobs 16", chromium_dir, depot_tools_dir)

  # Delete the src/out directory created by `gclient sync`.
  delete_directory(out_src_dir)

if cef_dir == cef_src_dir:
  # Running in fast update mode.
  if cef_checkout_changed or chromium_checkout_changed:
    # Check and restore the patched files.
    run_patch_updater("--reapply --restore")
elif os.path.exists(cef_dir) and not os.path.exists(cef_src_dir):
  # Restore the src/cef directory.
  copy_directory(cef_dir, cef_src_dir)

# Restore the src/out directory.
out_src_dir_exists = os.path.exists(out_src_dir)
if os.path.exists(out_dir) and not out_src_dir_exists:
  move_directory(out_dir, out_src_dir)
  out_src_dir_exists = True
elif not out_src_dir_exists:
  create_directory(out_src_dir)

# Write the config file for identifying the branch.
write_branch_config_file(out_src_dir, cef_branch)

if options.logchromiumchanges and chromium_checkout != chromium_compat_version:
  log_chromium_changes()

if options.forcepatchupdate or ((chromium_checkout_new or not options.fastupdate) and \
                                chromium_checkout_changed and \
                                chromium_checkout != chromium_compat_version):
  # Not using the known-compatible Chromium version. Try to update patch files.
  if options.logchromiumchanges:
    out_file = os.path.join(download_dir, 'chromium_update_patches.txt')
    if os.path.exists(out_file):
      os.remove(out_file)
  else:
    out_file = None
  run_patch_updater(output_file=out_file)
elif options.resave:
  # Resave patch files.
  run_patch_updater("--resave")

if chromium_checkout != chromium_compat_version:
  if options.logchromiumchanges:
    out_file = os.path.join(download_dir, 'chromium_update_patterns.txt')
    if os.path.exists(out_file):
      os.remove(out_file)
  else:
    out_file = None
  check_pattern_matches(output_file=out_file)

##
# Install dependencies.
##

if options.installbuilddeps and platform == 'linux':
  deps_script = os.path.join(chromium_src_dir, 'build/install-build-deps.sh')
  if options.x64build:
    cmd = 'sudo %s --no-prompt --no-chromeos-fonts' % deps_script
  else:
    cmd = 'sudo %s --no-prompt --no-chromeos-fonts --lib32' % deps_script
  run(cmd, chromium_src_dir)

##
# Build CEF.
##

if not options.nobuild and (chromium_checkout_changed or \
                            cef_checkout_changed or options.forcebuild or \
                            not out_src_dir_exists):
  # Building should also force a distribution.
  options.forcedistrib = True

  # Make sure the GN configuration exists.
  if not options.dryrun and \
    not os.path.exists(os.path.join(cef_src_dir, 'BUILD.gn')):
    raise Exception('GN configuration does not exist.')

  # Print all build-related environment variables including any that were set
  # previously.
  for key in os.environ.keys():
    if key.startswith('CEF_') or key.startswith('GCLIENT_') or \
       key.startswith('GN_') or key.startswith('GYP_') or \
       key.startswith('DEPOT_TOOLS_'):
      msg('%s=%s' % (key, os.environ[key]))

  # Generate project files.
  tool = os.path.join(cef_src_dir, 'tools', 'gclient_hook.py')
  run('%s %s' % (python_exe, tool), cef_src_dir, depot_tools_dir)

  # Build using Ninja.
  command = 'autoninja '
  if options.verbosebuild:
    command += '-v '
  if options.buildfailurelimit != 1:
    command += '-k %d ' % options.buildfailurelimit
  command += '-C '
  target = ' ' + options.buildtarget
  if options.buildtests:
    target += ' ' + options.testtarget
  if platform == 'linux':
    target += ' chrome_sandbox'

  # Make a CEF Debug build.
  if not options.nodebugbuild:
    build_path = os.path.join('out', get_build_directory_name(True))
    args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
    msg(args_path + ' contents:\n' + read_file(args_path))

    run(command + build_path + target, chromium_src_dir, depot_tools_dir,
        os.path.join(download_dir, 'build-%s-debug.log' % (cef_branch)) \
          if options.buildlogfile else None)

    if platform in sandbox_lib_platforms:
      # Make the separate cef_sandbox build when GN is_official_build=true.
      build_path += '_sandbox'
      if os.path.exists(os.path.join(chromium_src_dir, build_path)):
        args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
        msg(args_path + ' contents:\n' + read_file(args_path))

        run(command + build_path + ' cef_sandbox', chromium_src_dir, depot_tools_dir,
            os.path.join(download_dir, 'build-%s-debug-sandbox.log' % (cef_branch)) \
              if options.buildlogfile else None)

  # Make a CEF Release build.
  if not options.noreleasebuild:
    build_path = os.path.join('out', get_build_directory_name(False))
    args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
    msg(args_path + ' contents:\n' + read_file(args_path))

    run(command + build_path + target, chromium_src_dir, depot_tools_dir,
        os.path.join(download_dir, 'build-%s-release.log' % (cef_branch)) \
          if options.buildlogfile else None)

    if platform in sandbox_lib_platforms:
      # Make the separate cef_sandbox build when GN is_official_build=true.
      build_path += '_sandbox'
      if os.path.exists(os.path.join(chromium_src_dir, build_path)):
        args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
        msg(args_path + ' contents:\n' + read_file(args_path))

        run(command + build_path + ' cef_sandbox', chromium_src_dir, depot_tools_dir,
            os.path.join(download_dir, 'build-%s-release-sandbox.log' % (cef_branch)) \
              if options.buildlogfile else None)

elif not options.nobuild:
  msg('Not building. The source hashes have not changed and ' +
      'the output folder "%s" already exists' % (out_src_dir))

##
# Run CEF tests.
##

if options.runtests:
  if platform == 'windows':
    test_exe = '%s.exe' % options.testtarget
  elif platform == 'mac':
    test_exe = '%s.app/Contents/MacOS/%s' % (options.testtarget,
                                             options.testtarget)
  elif platform == 'linux':
    test_exe = options.testtarget

  test_prefix = options.testprefix
  if len(test_prefix) > 0:
    test_prefix += ' '

  test_args = options.testargs
  if len(test_args) > 0:
    test_args = ' ' + test_args

  if not options.nodebugtests:
    build_path = os.path.join(out_src_dir, get_build_directory_name(True))
    test_path = os.path.join(build_path, test_exe)
    if os.path.exists(test_path):
      run(test_prefix + test_path + test_args, build_path, depot_tools_dir)
    else:
      msg('Not running debug tests. Missing executable: %s' % test_path)

  if not options.noreleasetests:
    build_path = os.path.join(out_src_dir, get_build_directory_name(False))
    test_path = os.path.join(build_path, test_exe)
    if os.path.exists(test_path):
      run(test_prefix + test_path + test_args, build_path, depot_tools_dir)
    else:
      msg('Not running release tests. Missing executable: %s' % test_path)

##
# Create the CEF binary distribution.
##

if not options.nodistrib and (chromium_checkout_changed or \
                              cef_checkout_changed or options.forcedistrib):
  if not options.forceclean and options.cleanartifacts:
    # Clean the artifacts output directory.
    artifacts_path = os.path.join(cef_src_dir, 'binary_distrib')
    delete_directory(artifacts_path)

  # Determine the requested distribution types.
  distrib_types = []
  if options.minimaldistribonly:
    distrib_types.append('minimal')
  elif options.clientdistribonly:
    distrib_types.append('client')
  elif options.sandboxdistribonly:
    distrib_types.append('sandbox')
  else:
    distrib_types.append('standard')
    if options.minimaldistrib:
      distrib_types.append('minimal')
    if options.clientdistrib:
      distrib_types.append('client')
    if options.sandboxdistrib:
      distrib_types.append('sandbox')

  cef_tools_dir = os.path.join(cef_src_dir, 'tools')

  # Create the requested distribution types.
  first_type = True
  for type in distrib_types:
    path = '%s make_distrib.py --output-dir=../binary_distrib/' % python_exe

    if options.nodebugbuild or options.noreleasebuild or type != 'standard':
      path += ' --allow-partial'
    path = path + ' --ninja-build'
    if options.x64build:
      path += ' --x64-build'
    elif options.armbuild:
      path += ' --arm-build'
    elif options.arm64build:
      path += ' --arm64-build'

    if type == 'minimal':
      path += ' --minimal'
    elif type == 'client':
      path += ' --client'
    elif type == 'sandbox':
      path += ' --sandbox'

    if first_type:
      if options.nodistribdocs:
        path += ' --no-docs'
      if options.nodistribarchive:
        path += ' --no-archive'
      first_type = False
    else:
      # Don't create the symbol archives or documentation more than once.
      path += ' --no-symbols --no-docs'

    # Override the subdirectory name of binary_distrib if the caller requested.
    if options.distribsubdir != '':
      path += ' --distrib-subdir=' + options.distribsubdir
    if options.distribsubdirsuffix != '':
      path += ' --distrib-subdir-suffix=' + options.distribsubdirsuffix

    # Create the distribution.
    run(path, cef_tools_dir, depot_tools_dir)