Simpler logic to setup/restore Chrome command line

build/android/pylib/device/device_utils.py

 # Copyright 2014 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 a variety of device interactions based on adb.
 
 Eventually, this will be based on adb_wrapper.
 """
 # pylint: disable=W0613
 
+import pipes
 import sys
 import time
 
 import pylib.android_commands
 from pylib.device import adb_wrapper
 from pylib.device import decorators
 from pylib.device import device_errors
 from pylib.utils import apk_helper
 from pylib.utils import parallelizer
 
@@ skipping 607 matching lines @@
     """
     if as_root:
       if not self.old_interface.CanAccessProtectedFileContents():
         raise device_errors.CommandFailedError(
             'Cannot write to %s with root privileges.' % device_path)
       self.old_interface.SetProtectedFileContents(device_path, contents)
     else:
       self.old_interface.SetFileContents(device_path, contents)
 
   @decorators.WithTimeoutAndRetriesFromInstance()
+  def WriteTextFile(self, device_path, text, as_root=False, timeout=None,
+                    retries=None):
+    """Writes |text| to a file on the device.
+
+    Assuming that |text| is a small string, this is typically more efficient
+    than |WriteFile|, as no files are pushed into the device.
+
+    Args:
+      device_path: A string containing the absolute path to the file to write
+                   on the device.
+      text: A short string of text to write to the file on the device.
+      as_root: A boolean indicating whether the write should be executed with
+               root privileges.
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      CommandFailedError if the file could not be written on the device.
+      CommandTimeoutError on timeout.
+      DeviceUnreachableError on missing device.
+    """
+    self._RunShellCommandImpl('echo {1} > {0}'.format(device_path,
+        pipes.quote(text)), check_return=True, as_root=as_root)
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
   def Ls(self, device_path, timeout=None, retries=None):
     """Lists the contents of a directory on the device.
 
     Args:
       device_path: A string containing the path of the directory on the device
                    to list.
       timeout: timeout in seconds
       retries: number of retries
 
     Returns:
@@ skipping 167 matching lines @@
       A Parallelizer operating over |devices|.
     """
     if not devices or len(devices) == 0:
       devices = pylib.android_commands.GetAttachedDevices()
     parallelizer_type = (parallelizer.Parallelizer if async
                          else parallelizer.SyncParallelizer)
     return parallelizer_type([
         d if isinstance(d, DeviceUtils) else DeviceUtils(d)
         for d in devices])