platform.py revision effb81e5f8246d0db0270817048dc992db66e9fb 
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"""Module for the target platform support."""
6
7from importlib import import_module
8import os
9
10import cr
11
12DEFAULT = cr.Config.From(
13    DEPOT_TOOLS=os.path.join('{GOOGLE_CODE}', 'depot_tools'),
14)
15
16
17class Platform(cr.Plugin, cr.Plugin.Type):
18  """Base class for implementing cr platforms.
19
20  A platform is the target operating system being compiled for (linux android).
21  """
22
23  _platform_module = import_module('platform', None)
24  SELECTOR = 'CR_PLATFORM'
25
26  @classmethod
27  def AddArguments(cls, parser):
28    parser.add_argument(
29        '--platform', dest=cls.SELECTOR,
30        choices=cls.Choices(),
31        default=None,
32        help='Sets the target platform to use. Overrides ' + cls.SELECTOR
33    )
34
35  @classmethod
36  def System(cls):
37    return cls._platform_module.system()
38
39  def __init__(self):
40    super(Platform, self).__init__()
41
42  def Activate(self):
43    super(Platform, self).Activate()
44    if _PathFixup not in cr.context.fixup_hooks:
45      cr.context.fixup_hooks.append(_PathFixup)
46
47  @cr.Plugin.activemethod
48  def Prepare(self):
49    pass
50
51  @property
52  def paths(self):
53    return []
54
55
56def _PathFixup(base, key, value):
57  """A context fixup that does platform specific modifications to the PATH."""
58  if key == 'PATH':
59    paths = []
60    for entry in Platform.GetActivePlugin().paths:
61      entry = base.Substitute(entry)
62      if entry not in paths:
63        paths.append(entry)
64    for entry in value.split(os.path.pathsep):
65      if entry.endswith(os.path.sep + 'goma'):
66        pass
67      elif entry not in paths:
68        paths.append(entry)
69    value = os.path.pathsep.join(paths)
70  return value
71