Use the new forwarder2's Daemon implementation in device_forwarder.

build/android/pylib/android_commands.py

 # Copyright (c) 2012 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.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 
 import collections
@@ skipping 448 matching lines @@
     logging.info('>>> $' + command)
     if "'" in command: logging.warning(command + " contains ' quotes")
     result = self._adb.SendShellCommand(
         "'%s'" % command, timeout_time).splitlines()
     if ['error: device not found'] == result:
       raise errors.DeviceUnresponsiveError('device not found')
     if log_result:
       logging.info('\n>>> '.join(result))
     return result
 
+  def GetShellCommandStatusAndOutput(self, command, timeout_time=20,
+                                     log_result=False):
+    """See RunShellCommand() above.
+
+    Returns:
+      The tuple (exit code, list of output lines).
+    """
+    lines = self.RunShellCommand(
+        command + '; echo $?', timeout_time, log_result)

[digit1, 2012/11/19 15:27:43]

Nit: This assumes that the command's output will be newline-terminated. This is
not always guaranteed. One thing I did in one of my implementations of this
wrapper is to do something like that instead:

  adb shell command '; echo %$?'  => lines
  last_line = lines[-1]
  status_pos = last_line.rfind('%')
  assert status_pos >= 0
  status = int(last_line[status_pos+1:])   # extract status
  if status_pos == 0:
    lines = lines[:-1]
  else:
    lines = lines[:-1] + last_line[:status_pos]

[Philippe, 2012/11/19 17:18:59]

Good point.

+    return (int(lines[-1]), lines[:-1])
+
   def KillAll(self, process):
     """Android version of killall, connected via adb.
 
     Args:
       process: name of the process to kill off
 
     Returns:
       the number of processes killed
     """
     pids = self.ExtractPid(process)
@@ skipping 613 matching lines @@
   """
   def __init__(self, output):
     self._output = output
 
   def write(self, data):
     data = data.replace('\r\r\n', '\n')
     self._output.write(data)
 
   def flush(self):
     self._output.flush()