build/landmine_utils.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5
   6 import functools
   7 import logging
   8 import os
   9 import shlex
  10 import sys
  11
  12
  13 def memoize(default=None):
  14   """This decorator caches the return value of a parameterless pure function"""
  15   def memoizer(func):
  16     val = []
  17     @functools.wraps(func)
  18     def inner():
  19       if not val:
  20         ret = func()
  21         val.append(ret if ret is not None else default)
  22         if logging.getLogger().isEnabledFor(logging.INFO):
  23           print '%s -> %r' % (func.__name__, val[0])
  24       return val[0]
  25     return inner
  26   return memoizer
  27
  28
  29 @memoize()
  30 def IsWindows():
  31   return sys.platform in ['win32', 'cygwin']
  32
  33
  34 @memoize()
  35 def IsLinux():
  36   return sys.platform.startswith(('linux', 'freebsd'))
  37
  38
  39 @memoize()
  40 def IsMac():
  41   return sys.platform == 'darwin'
  42
  43
  44 @memoize()
  45 def gyp_defines():
  46   """Parses and returns GYP_DEFINES env var as a dictionary."""
  47   return dict(arg.split('=', 1)
  48       for arg in shlex.split(os.environ.get('GYP_DEFINES', '')))
  49
  50 @memoize()
  51 def gyp_generator_flags():
  52   """Parses and returns GYP_GENERATOR_FLAGS env var as a dictionary."""
  53   return dict(arg.split('=', 1)
  54       for arg in shlex.split(os.environ.get('GYP_GENERATOR_FLAGS', '')))
  55
  56 @memoize()
  57 def gyp_msvs_version():
  58   return os.environ.get('GYP_MSVS_VERSION', '')
  59
  60 @memoize()
  61 def distributor():
  62   """
  63   Returns a string which is the distributed build engine in use (if any).
  64   Possible values: 'goma', 'ib', ''
  65   """
  66   if 'goma' in gyp_defines():
  67     return 'goma'
  68   elif IsWindows():
  69     if 'CHROME_HEADLESS' in os.environ:
  70       return 'ib' # use (win and !goma and headless) as approximation of ib
  71
  72
  73 @memoize()
  74 def platform():
  75   """
  76   Returns a string representing the platform this build is targetted for.
  77   Possible values: 'win', 'mac', 'linux', 'ios', 'android'
  78   """
  79   if 'OS' in gyp_defines():
  80     if 'android' in gyp_defines()['OS']:
  81       return 'android'
  82     else:
  83       return gyp_defines()['OS']
  84   elif IsWindows():
  85     return 'win'
  86   elif IsLinux():
  87     return 'linux'
  88   else:
  89     return 'mac'
  90
  91
  92 @memoize()
  93 def builder():
  94   """
  95   Returns a string representing the build engine (not compiler) to use.
  96   Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
  97   """
  98   if 'GYP_GENERATORS' in os.environ:
  99     # for simplicity, only support the first explicit generator
 100     generator = os.environ['GYP_GENERATORS'].split(',')[0]
 101     if generator.endswith('-android'):
 102       return generator.split('-')[0]
 103     elif generator.endswith('-ninja'):
 104       return 'ninja'
 105     else:
 106       return generator
 107   else:
 108     if platform() == 'android':
 109       # Good enough for now? Do any android bots use make?
 110       return 'ninja'
 111     elif platform() == 'ios':
 112       return 'xcode'
 113     elif IsWindows():
 114       return 'ninja'
 115     elif IsLinux():
 116       return 'ninja'
 117     elif IsMac():
 118       return 'ninja'
 119     else:
 120       assert False, 'Don\'t know what builder we\'re using!'