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Side by Side Diff: build/android/pylib/system_properties.py

Issue 2101243005: Add a snapshot of flutter/engine/src/build to our sdk (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: add README.dart Created 4 years, 5 months ago
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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 class SystemProperties(dict):
7
8 """A dict interface to interact with device system properties.
9
10 System properties are key/value pairs as exposed by adb shell getprop/setprop.
11
12 This implementation minimizes interaction with the physical device. It is
13 valid for the lifetime of a boot.
14 """
15
16 def __init__(self, android_commands):
17 super(SystemProperties, self).__init__()
18 self._adb = android_commands
19 self._cached_static_properties = {}
20
21 def __getitem__(self, key):
22 if self._IsStatic(key):
23 if key not in self._cached_static_properties:
24 self._cached_static_properties[key] = self._GetProperty(key)
25 return self._cached_static_properties[key]
26 return self._GetProperty(key)
27
28 def __setitem__(self, key, value):
29 # TODO(tonyg): This can fail with no root. Verify that it succeeds.
30 self._adb.SendShellCommand('setprop %s "%s"' % (key, value), retry_count=3)
31
32 @staticmethod
33 def _IsStatic(key):
34 # TODO(tonyg): This list is conservative and could be expanded as needed.
35 return (key.startswith('ro.boot.') or
36 key.startswith('ro.build.') or
37 key.startswith('ro.product.'))
38
39 def _GetProperty(self, key):
40 return self._adb.SendShellCommand('getprop %s' % key, retry_count=3).strip()
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