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')
  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_msvs_version():
  52   return os.environ.get('GYP_MSVS_VERSION', '')
  53
  54 @memoize()
  55 def distributor():
  56   """
  57   Returns a string which is the distributed build engine in use (if any).
  58   Possible values: 'goma', 'ib', ''
  59   """
  60   if 'goma' in gyp_defines():
  61     return 'goma'
  62   elif IsWindows():
  63     if 'CHROME_HEADLESS' in os.environ:
  64       return 'ib' # use (win and !goma and headless) as approximation of ib
  65
  66
  67 @memoize()
  68 def platform():
  69   """
  70   Returns a string representing the platform this build is targetted for.
  71   Possible values: 'win', 'mac', 'linux', 'ios', 'android'
  72   """
  73   if 'OS' in gyp_defines():
  74     if 'android' in gyp_defines()['OS']:
  75       return 'android'
  76     else:
  77       return gyp_defines()['OS']
  78   elif IsWindows():
  79     return 'win'
  80   elif IsLinux():
  81     return 'linux'
  82   else:
  83     return 'mac'
  84
  85
  86 @memoize()
  87 def builder():
  88   """
  89   Returns a string representing the build engine (not compiler) to use.
  90   Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
  91   """
  92   if 'GYP_GENERATORS' in os.environ:
  93     # for simplicity, only support the first explicit generator
  94     generator = os.environ['GYP_GENERATORS'].split(',')[0]
  95     if generator.endswith('-android'):
  96       return generator.split('-')[0]
  97     elif generator.endswith('-ninja'):
  98       return 'ninja'
  99     else:
 100       return generator
 101   else:
 102     if platform() == 'android':
 103       # Good enough for now? Do any android bots use make?
 104       return 'ninja'
 105     elif platform() == 'ios':
 106       return 'xcode'
 107     elif IsWindows():
 108       return 'ninja'
 109     elif IsLinux():
 110       return 'ninja'
 111     elif IsMac():
 112       return 'ninja'
 113     else:
 114       assert False, 'Don\'t know what builder we\'re using!'