blob: 3f16f86e77b8f19862b37187686353d8912d43ee [file] [log] [blame]
# Copyright 2013 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.
class SystemProperties(dict):
"""A dict interface to interact with device system properties.
System properties are key/value pairs as exposed by adb shell getprop/setprop.
This implementation minimizes interaction with the physical device. It is
valid for the lifetime of a boot.
def __init__(self, android_commands):
super(SystemProperties, self).__init__()
self._adb = android_commands
self._cached_static_properties = {}
def __getitem__(self, key):
if self._IsStatic(key):
if key not in self._cached_static_properties:
self._cached_static_properties[key] = self._GetProperty(key)
return self._cached_static_properties[key]
return self._GetProperty(key)
def __setitem__(self, key, value):
# TODO(tonyg): This can fail with no root. Verify that it succeeds.
self._adb.SendShellCommand('setprop %s "%s"' % (key, value), retry_count=3)
def _IsStatic(key):
# TODO(tonyg): This list is conservative and could be expanded as needed.
return (key.startswith('ro.boot.') or
key.startswith('') or
def _GetProperty(self, key):
return self._adb.SendShellCommand('getprop %s' % key, retry_count=3).strip()