Add get_props to adb.py's AndroidDevice.

Saves adb shell roundtrips if multiple properties are needed.

Change-Id: I3a9fc0354b6eb0ee5389984e3f345c380404658c

python-packages/adb/device.py

@@ -411,6 +411,22 @@ class AndroidDevice(object):
     def wait(self):
         return self._simple_call(['wait-for-device'])
 
+    def get_props(self):
+        result = {}
+        output, _ = self.shell(['getprop'])
+        output = output.splitlines()
+        pattern = re.compile(r'^\[([^]]+)\]: \[(.*)\]')
+        for line in output:
+            match = pattern.match(line)
+            if match is None:
+                raise RuntimeError('invalid getprop line: "{}"'.format(line))
+            key = match.group(1)
+            value = match.group(2)
+            if key in result:
+                raise RuntimeError('duplicate getprop key: "{}"'.format(key))
+            result[key] = value
+        return result
+
     def get_prop(self, prop_name):
         output = self.shell(['getprop', prop_name])[0].splitlines()
         if len(output) != 1: