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#!/usr/bin/env python
# Copyright 2017 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.
"""A script to replace a system app while running a command."""
import argparse
import contextlib
import logging
import os
import posixpath
import sys
if __name__ == '__main__':
sys.path.append(
os.path.abspath(os.path.join(os.path.dirname(__file__),
'..', '..', '..')))
from devil.android import apk_helper
from devil.android import device_errors
from devil.android import device_temp_file
from devil.android.sdk import version_codes
from devil.android.tools import script_common
from devil.utils import cmd_helper
from devil.utils import parallelizer
from devil.utils import run_tests_helper
logger = logging.getLogger(__name__)
def RemoveSystemApps(device, package_names):
"""Removes the given system apps.
Args:
device: (device_utils.DeviceUtils) the device for which the given
system app should be removed.
package_name: (iterable of strs) the names of the packages to remove.
"""
system_package_paths = _FindSystemPackagePaths(device, package_names)
if system_package_paths:
with EnableSystemAppModification(device):
device.RemovePath(system_package_paths, force=True, recursive=True)
@contextlib.contextmanager
def ReplaceSystemApp(device, package_name, replacement_apk):
"""A context manager that replaces the given system app while in scope.
Args:
device: (device_utils.DeviceUtils) the device for which the given
system app should be replaced.
package_name: (str) the name of the package to replace.
replacement_apk: (str) the path to the APK to use as a replacement.
"""
storage_dir = device_temp_file.NamedDeviceTemporaryDirectory(device.adb)
relocate_app = _RelocateApp(device, package_name, storage_dir.name)
install_app = _TemporarilyInstallApp(device, replacement_apk)
with storage_dir, relocate_app, install_app:
yield
def _FindSystemPackagePaths(device, system_package_list):
"""Finds all system paths for the given packages."""
found_paths = []
for system_package in system_package_list:
found_paths.extend(device.GetApplicationPaths(system_package))
return [p for p in found_paths if p.startswith('/system/')]
_ENABLE_MODIFICATION_PROP = 'devil.modify_sys_apps'
@contextlib.contextmanager
def EnableSystemAppModification(device):
"""A context manager that allows system apps to be modified while in scope.
Args:
device: (device_utils.DeviceUtils) the device
"""
if device.GetProp(_ENABLE_MODIFICATION_PROP) == '1':
yield
return
device.EnableRoot()
if not device.HasRoot():
raise device_errors.CommandFailedError(
'Failed to enable modification of system apps on non-rooted device',
str(device))
try:
# Disable Marshmallow's Verity security feature
if device.build_version_sdk >= version_codes.MARSHMALLOW:
logger.info('Disabling Verity on %s', device.serial)
device.adb.DisableVerity()
device.Reboot()
device.WaitUntilFullyBooted()
device.EnableRoot()
device.adb.Remount()
device.RunShellCommand(['stop'], check_return=True)
device.SetProp(_ENABLE_MODIFICATION_PROP, '1')
yield
finally:
device.SetProp(_ENABLE_MODIFICATION_PROP, '0')
device.Reboot()
device.WaitUntilFullyBooted()
@contextlib.contextmanager
def _RelocateApp(device, package_name, relocate_to):
"""A context manager that relocates an app while in scope."""
relocation_map = {}
system_package_paths = _FindSystemPackagePaths(device, [package_name])
if system_package_paths:
relocation_map = {
p: posixpath.join(relocate_to, posixpath.relpath(p, '/'))
for p in system_package_paths
}
relocation_dirs = [
posixpath.dirname(d)
for _, d in relocation_map.iteritems()
]
device.RunShellCommand(['mkdir', '-p'] + relocation_dirs,
check_return=True)
_MoveApp(device, relocation_map)
else:
logger.info('No system package "%s"', package_name)
try:
yield
finally:
_MoveApp(device, {v: k for k, v in relocation_map.iteritems()})
@contextlib.contextmanager
def _TemporarilyInstallApp(device, apk):
"""A context manager that installs an app while in scope."""
device.Install(apk, reinstall=True)
try:
yield
finally:
device.Uninstall(apk_helper.GetPackageName(apk))
def _MoveApp(device, relocation_map):
"""Moves an app according to the provided relocation map.
Args:
device: (device_utils.DeviceUtils)
relocation_map: (dict) A dict that maps src to dest
"""
movements = [
'mv %s %s' % (k, v)
for k, v in relocation_map.iteritems()
]
cmd = ' && '.join(movements)
with EnableSystemAppModification(device):
device.RunShellCommand(cmd, as_root=True, check_return=True, shell=True)
def main(raw_args):
parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers()
def add_common_arguments(p):
script_common.AddDeviceArguments(p)
script_common.AddEnvironmentArguments(p)
p.add_argument(
'-v', '--verbose', action='count', default=0,
help='Print more information.')
p.add_argument('command', nargs='*')
@contextlib.contextmanager
def remove_system_app(device, args):
RemoveSystemApps(device, args.packages)
yield
remove_parser = subparsers.add_parser('remove')
remove_parser.add_argument(
'--package', dest='packages', nargs='*', required=True,
help='The system package(s) to remove.')
add_common_arguments(remove_parser)
remove_parser.set_defaults(func=remove_system_app)
@contextlib.contextmanager
def replace_system_app(device, args):
with ReplaceSystemApp(device, args.package, args.replace_with):
yield
replace_parser = subparsers.add_parser('replace')
replace_parser.add_argument(
'--package', required=True,
help='The system package to replace.')
replace_parser.add_argument(
'--replace-with', metavar='APK', required=True,
help='The APK with which the existing system app should be replaced.')
add_common_arguments(replace_parser)
replace_parser.set_defaults(func=replace_system_app)
args = parser.parse_args(raw_args)
run_tests_helper.SetLogLevel(args.verbose)
script_common.InitializeEnvironment(args)
devices = script_common.GetDevices(args.devices, args.blacklist_file)
parallel_devices = parallelizer.SyncParallelizer(
[args.func(d, args) for d in devices])
with parallel_devices:
if args.command:
return cmd_helper.Call(args.command)
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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