OLD | NEW |
(Empty) | |
| 1 # Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. |
| 4 |
| 5 import logging |
| 6 import pipes |
| 7 import sys |
| 8 |
| 9 from telemetry.core import util |
| 10 |
| 11 util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'android') |
| 12 from pylib.device import device_errors # pylint: disable=F0401 |
| 13 |
| 14 |
| 15 def _QuoteIfNeeded(arg): |
| 16 # Properly escape "key=valueA valueB" to "key='valueA valueB'" |
| 17 # Values without spaces, or that seem to be quoted are left untouched. |
| 18 # This is required so CommandLine.java can parse valueB correctly rather |
| 19 # than as a separate switch. |
| 20 params = arg.split('=', 1) |
| 21 if len(params) != 2: |
| 22 return arg |
| 23 key, values = params |
| 24 if ' ' not in values: |
| 25 return arg |
| 26 if values[0] in '"\'' and values[-1] == values[0]: |
| 27 return arg |
| 28 return '%s=%s' % (key, pipes.quote(values)) |
| 29 |
| 30 |
| 31 class SetUpCommandLineFlags(object): |
| 32 """A context manager for setting up the android command line flags. |
| 33 |
| 34 This provides a readable way of using the android command line backend class. |
| 35 Example usage: |
| 36 |
| 37 with android_command_line_backend.SetUpCommandLineFlags( |
| 38 adb, backend_settings, startup_args): |
| 39 # Something to run while the command line flags are set appropriately. |
| 40 """ |
| 41 def __init__(self, adb, backend_settings, startup_args): |
| 42 self._android_command_line_backend = _AndroidCommandLineBackend( |
| 43 adb, backend_settings, startup_args) |
| 44 |
| 45 def __enter__(self): |
| 46 self._android_command_line_backend.SetUpCommandLineFlags() |
| 47 |
| 48 def __exit__(self, *args): |
| 49 self._android_command_line_backend.RestoreCommandLineFlags() |
| 50 |
| 51 |
| 52 class _AndroidCommandLineBackend(object): |
| 53 """The backend for providing command line flags on android. |
| 54 |
| 55 There are command line flags that Chromium accept in order to enable |
| 56 particular features or modify otherwise default functionality. To set the |
| 57 flags for Chrome on Android, specific files on the device must be updated |
| 58 with the flags to enable. This class provides a wrapper around this |
| 59 functionality. |
| 60 """ |
| 61 |
| 62 def __init__(self, adb, backend_settings, startup_args): |
| 63 self._adb = adb |
| 64 self._backend_settings = backend_settings |
| 65 self._startup_args = startup_args |
| 66 self._saved_command_line_file_contents = '' |
| 67 |
| 68 @property |
| 69 def command_line_file(self): |
| 70 return self._backend_settings.GetCommandLineFile(self._adb.IsUserBuild()) |
| 71 |
| 72 def SetUpCommandLineFlags(self): |
| 73 args = [self._backend_settings.pseudo_exec_name] |
| 74 args.extend(self._startup_args) |
| 75 content = ' '.join(_QuoteIfNeeded(arg) for arg in args) |
| 76 |
| 77 try: |
| 78 # Save the current command line to restore later, except if it appears to |
| 79 # be a Telemetry created one. This is to prevent a common bug where |
| 80 # --host-resolver-rules borks people's browsers if something goes wrong |
| 81 # with Telemetry. |
| 82 self._saved_command_line_file_contents = ''.join(self._ReadFile()) |
| 83 if '--host-resolver-rules' in self._saved_command_line_file_contents: |
| 84 self._saved_command_line_file_contents = '' |
| 85 self._WriteFile(content) |
| 86 except device_errors.CommandFailedError: |
| 87 logging.critical('Cannot set Chrome command line. ' |
| 88 'Fix this by flashing to a userdebug build.') |
| 89 sys.exit(1) |
| 90 |
| 91 def RestoreCommandLineFlags(self): |
| 92 self._WriteFile(self._saved_command_line_file_contents) |
| 93 |
| 94 def _ReadFile(self): |
| 95 return self._adb.device().ReadFile(self.command_line_file) |
| 96 |
| 97 def _WriteFile(self, contents): |
| 98 self._adb.device().WriteFile(self.command_line_file, contents, as_root=True) |
OLD | NEW |