Android Telemetry: automates devices running "user" build.

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 696 matching lines @@
   _TEMP_FILE_BASE_FMT = 'temp_file_%d'
   _TEMP_SCRIPT_FILE_BASE_FMT = 'temp_script_file_%d.sh'
 
   def _GetDeviceTempFileName(self, base_name):
     i = 0
     while self.FileExistsOnDevice(
         self.GetExternalStorage() + '/' + base_name % i):
       i += 1
     return self.GetExternalStorage() + '/' + base_name % i
 
+  def GetProtectedFileContents(self, filename, log_result=False):
+    """Gets contents from the protected file specified by |filename|.
+
+    This is less efficient than GetFileContents, but will work for protected
+    files and device files.
+    """
+    temp_script = self._GetDeviceTempFileName(
+        AndroidCommands._TEMP_SCRIPT_FILE_BASE_FMT)
+    self.SetFileContents(temp_script,
+        'if [ -f "' + filename + '" ]; then cat "' + filename + '"; fi')
+    # Run the script as root
+    return self.RunShellCommand('su -c sh %s' % temp_script)

[Sami, 2013/02/11 14:57:13]

Any reason why we can't just do 'su -c cat "%s" 2>/dev/null'? If that doesn't
work, then let's rm temp_script once we're done with it.

[bulach, 2013/02/11 18:47:25]

great idea, looks better... :) fixed GetFileContents too.

+
   def SetProtectedFileContents(self, filename, contents):
     """Writes |contents| to the protected file specified by |filename|.
 
     This is less efficient than SetFileContents, but will work for protected
     files and device files.
     """
     temp_file = self._GetDeviceTempFileName(AndroidCommands._TEMP_FILE_BASE_FMT)
     temp_script = self._GetDeviceTempFileName(
         AndroidCommands._TEMP_SCRIPT_FILE_BASE_FMT)
 
@@ skipping 463 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()