blob: 636022b9abd80b6a21b2d702b1a53fea956cb5c6 [file] [log] [blame]
#!/usr/bin/python
# Copyright (c) 2011 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.
# Location where chrome reads command line flags from
CHROME_COMMAND_FILE = '/data/local/chrome-command-line'
class FlagChanger(object):
"""Temporarily changes the flags Chrome runs with."""
def __init__(self, android_cmd):
self._android_cmd = android_cmd
self._old_flags = None
def Set(self, flags, append=False):
"""Sets the command line flags used when chrome is started.
Args:
flags: A list of flags to set, eg. ['--single-process'].
append: Whether to append to existing flags or overwrite them.
"""
if flags:
assert flags[0] != 'chrome'
if not self._old_flags:
self._old_flags = self._android_cmd.GetFileContents(CHROME_COMMAND_FILE)
if self._old_flags:
self._old_flags = self._old_flags[0].strip()
if append and self._old_flags:
# Avoid appending flags that are already present.
new_flags = filter(lambda flag: self._old_flags.find(flag) == -1, flags)
self._android_cmd.SetFileContents(CHROME_COMMAND_FILE,
self._old_flags + ' ' +
' '.join(new_flags))
else:
self._android_cmd.SetFileContents(CHROME_COMMAND_FILE,
'chrome ' + ' '.join(flags))
def Restore(self):
"""Restores the flags to their original state."""
if self._old_flags == None:
return # Set() was never called.
elif self._old_flags:
self._android_cmd.SetFileContents(CHROME_COMMAND_FILE, self._old_flags)
else:
self._android_cmd.RunShellCommand('rm ' + CHROME_COMMAND_FILE)