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Unified Diff: build/android/pylib/system_properties.py

Issue 1288993002: Revert of [Android] Remove android_commands and android_testrunner. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 4 months ago
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Index: build/android/pylib/system_properties.py
diff --git a/build/android/pylib/system_properties.py b/build/android/pylib/system_properties.py
new file mode 100644
index 0000000000000000000000000000000000000000..3f16f86e77b8f19862b37187686353d8912d43ee
--- /dev/null
+++ b/build/android/pylib/system_properties.py
@@ -0,0 +1,40 @@
+# 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)
+
+ @staticmethod
+ def _IsStatic(key):
+ # TODO(tonyg): This list is conservative and could be expanded as needed.
+ return (key.startswith('ro.boot.') or
+ key.startswith('ro.build.') or
+ key.startswith('ro.product.'))
+
+ def _GetProperty(self, key):
+ return self._adb.SendShellCommand('getprop %s' % key, retry_count=3).strip()
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