Revert 166085 - Selective build clobbering feature (landmines.py and android build scripts).

build/landmines.py

-#!/usr/bin/env python
-# Copyright (c) 2012 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.
-
-"""
-This file holds a list of reasons why a particular build needs to be clobbered
-(or a list of 'landmines').
-
-This script runs every build as a hook. If it detects that the build should
-be clobbered, it will touch the file <build_dir>/.landmine_triggered. The
-various build scripts will then check for the presence of this file and clobber
-accordingly. The script will also emit the reasons for the clobber to stdout.
-
-A landmine is tripped when a builder checks out a different revision, and the
-diff between the new landmines and the old ones is non-null. At this point, the
-build is clobbered.
-"""
-
-import difflib
-import functools
-import gyp_helper
-import os
-import shlex
-import sys
-import time
-
-SRC_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
-
-def memoize(default=None):
-  """This decorator caches the return value of a parameterless pure function"""
-  def memoizer(func):
-    val = []
-    @functools.wraps(func)
-    def inner():
-      if not val:
-        ret = func()
-        val.append(ret if ret is not None else default)
-        print '%s -> %r' % (func.__name__, val[0])
-      return val[0]
-    return inner
-  return memoizer
-
-
-@memoize()
-def IsWindows():
-  return sys.platform.startswith('win') or sys.platform == 'cygwin'
-
-
-@memoize()
-def IsLinux():
-  return sys.platform.startswith('linux')
-
-
-@memoize()
-def IsMac():
-  return sys.platform.startswith('darwin')
-
-
-@memoize()
-def gyp_defines():
-  """Parses and returns GYP_DEFINES env var as a dictionary."""
-  return dict(arg.split('=', 1)
-      for arg in shlex.split(os.environ.get('GYP_DEFINES', '')))
-
-
-@memoize()
-def distributor():
-  """
-  Returns a string which is the distributed build engine in use (if any).
-  Possible values: 'goma', 'ib', ''
-  """
-  if 'goma' in gyp_defines():
-    return 'goma'
-  elif IsWindows():
-    if 'CHROME_HEADLESS' in os.environ:
-      return 'ib' # use (win and !goma and headless) as approximation of ib
-
-
-@memoize()
-def platform():
-  """
-  Returns a string representing the platform this build is targetted for.
-  Possible values: 'win', 'mac', 'linux', 'ios', 'android'
-  """
-  if 'OS' in gyp_defines():
-    if 'android' in gyp_defines()['OS']:
-      return 'android'
-    else:
-      return gyp_defines()['OS']
-  elif IsWindows():
-    return 'win'
-  elif IsLinux():
-    return 'linux'
-  else:
-    return 'mac'
-
-
-@memoize()
-def builder():
-  """
-  Returns a string representing the build engine (not compiler) to use.
-  Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
-  """
-  if 'GYP_GENERATORS' in os.environ:
-    # for simplicity, only support the first explicit generator
-    generator = os.environ['GYP_GENERATORS'].split(',')[0]
-    if generator.endswith('-android'):
-      return generator.split('-')[0]
-    else:
-      return generator
-  else:
-    if platform() == 'android':
-      # Good enough for now? Do any android bots use make?
-      return 'ninja'
-    elif platform() == 'ios':
-      return 'xcode'
-    elif IsWindows():
-      return 'msvs'
-    elif IsLinux():
-      return 'make'
-    elif IsMac():
-      return 'xcode'
-    else:
-      assert False, 'Don\'t know what builder we\'re using!'
-
-
-def get_landmines(target):
-  """
-  ALL LANDMINES ARE DEFINED HERE.
-  target is 'Release' or 'Debug'
-  """
-  landmines = []
-  add = lambda item: landmines.append(item + '\n')
-
-  if (distributor() == 'goma' and platform() == 'win32' and
-      builder() == 'ninja'):
-    add('Need to clobber winja goma due to backend cwd cache fix.')
-
-  return landmines
-
-
-def get_target_build_dir(build_tool, target, is_iphone=False):
-  """
-  Returns output directory absolute path dependent on build and targets.
-  Examples:
-    r'c:\b\build\slave\win\build\src\out\Release'
-    '/mnt/data/b/build/slave/linux/build/src/out/Debug'
-    '/b/build/slave/ios_rel_device/build/src/xcodebuild/Release-iphoneos'
-  """
-  ret = None
-  if build_tool == 'xcode':
-    ret = os.path.join(SRC_DIR, 'xcodebuild',
-        target + ('-iphoneos' if is_iphone else ''))
-  elif build_tool == 'make':
-    ret = os.path.join(SRC_DIR, 'out', target)
-  elif build_tool == 'ninja':
-    ret = os.path.join(SRC_DIR, 'out', target)
-  elif build_tool == 'msvs':
-    ret = os.path.join(SRC_DIR, 'build', target)
-  elif build_tool == 'scons':
-    ret = os.path.join(SRC_DIR, 'sconsbuild', target)
-  else:
-    raise NotImplementedError()
-  return os.path.abspath(ret)
-
-
-def main(argv):
-  if len(argv) > 1:
-    print('Unknown arguments %s' % argv[1:])
-    return 1
-
-  gyp_helper.apply_chromium_gyp_env()
-
-  for target in ('Debug', 'Release'):
-    out_dir = get_target_build_dir(builder(), target,
-                                   platform() == 'ios')
-
-    landmines_path = os.path.join(out_dir, '.landmines')
-    if not os.path.exists(out_dir):
-      os.makedirs(out_dir)
-
-    new_landmines = get_landmines(target)
-
-    if not os.path.exists(landmines_path):
-      with open(landmines_path, 'w') as f:
-        f.writelines(new_landmines)
-    else:
-      triggered = os.path.join(out_dir, '.landmines_triggered')
-      with open(landmines_path, 'r') as f:
-        old_landmines = f.readlines()
-      if old_landmines != new_landmines:
-        old_date = time.ctime(os.stat(landmines_path).st_ctime)
-        diff = difflib.unified_diff(old_landmines, new_landmines,
-            fromfile='old_landmines', tofile='new_landmines',
-            fromfiledate=old_date, tofiledate=time.ctime(), n=0)
-
-        with open(triggered, 'w') as f:
-          f.writelines(diff)
-      elif os.path.exists(triggered):
-        # Remove false triggered landmines.
-        os.remove(triggered)
-
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv))