infra/scripts/build_directory.py

# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Functions for discovering and clearing the build directory."""

import os
import sys


def IsFileNewerThanFile(file_a, file_b):
  """Returns True if file_a's mtime is newer than file_b's."""
  def getmtime(f):
    try:
      return os.path.getmtime(f)
    except os.error:
      return 0
  return getmtime(file_a) >= getmtime(file_b)


def AreNinjaFilesNewerThanXcodeFiles(src_dir=None):
  """Returns True if the generated ninja files are newer than the generated
  xcode files.

  Parameters:
    src_dir: The path to the src directory.  If None, it's assumed to be
             at src/ relative to the current working directory.
  """
  src_dir = src_dir or 'src'
  ninja_path = os.path.join(src_dir, 'out', 'Release', 'build.ninja')
  xcode_path = os.path.join(
      src_dir, 'build', 'all.xcodeproj', 'project.pbxproj')
  return IsFileNewerThanFile(ninja_path, xcode_path)


def GetBuildOutputDirectory(src_dir=None, cros_board=None):
  """Returns the path to the build directory, relative to the checkout root.

  Assumes that the current working directory is the checkout root.
  """
  # src_dir is only needed for compiling v8, which uses compile.py (but no other
  # of the build scripts), but its source root isn't "src" -- crbug.com/315004
  if src_dir is None:
    src_dir = 'src'

  if sys.platform.startswith('linux'):
    out_dirname = 'out'
    if cros_board:
      # Simple chrome workflow output (e.g., "out_x86-generic")
      out_dirname += '_%s' % (cros_board,)
    return os.path.join(src_dir, out_dirname)
  assert not cros_board, "'cros_board' not supported on this platform"

  if sys.platform == 'cygwin' or sys.platform.startswith('win') or (
      sys.platform == 'darwin'):
    return os.path.join(src_dir, 'out')

  raise NotImplementedError('Unexpected platform %s' % sys.platform)