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+# Copyright 2015 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 fastboot."""
+# pylint: disable=unused-argument
+
+import contextlib
+import fnmatch
+import logging
+import os
+import re
+
+from devil.android import decorators
+from devil.android import device_errors
+from devil.android.sdk import fastboot
+from devil.utils import timeout_retry
+
+_DEFAULT_TIMEOUT = 30
+_DEFAULT_RETRIES = 3
+_FASTBOOT_REBOOT_TIMEOUT = 10 * _DEFAULT_TIMEOUT
+ALL_PARTITIONS = [
+ 'bootloader',
+ 'radio',
+ 'boot',
+ 'recovery',
+ 'system',
+ 'userdata',
+ 'cache',
+]
+
+class FastbootUtils(object):
+
+ _FASTBOOT_WAIT_TIME = 1
+ _RESTART_WHEN_FLASHING = ['bootloader', 'radio']
+ _BOARD_VERIFICATION_FILE = 'android-info.txt'
+ _FLASH_IMAGE_FILES = {
+ 'bootloader': 'bootloader*.img',
+ 'radio': 'radio*.img',
+ 'boot': 'boot.img',
+ 'recovery': 'recovery.img',
+ 'system': 'system.img',
+ 'userdata': 'userdata.img',
+ 'cache': 'cache.img',
+ }
+
+ def __init__(self, device, fastbooter=None, default_timeout=_DEFAULT_TIMEOUT,
+ default_retries=_DEFAULT_RETRIES):
+ """FastbootUtils constructor.
+
+ Example Usage to flash a device:
+ fastboot = fastboot_utils.FastbootUtils(device)
+ fastboot.FlashDevice('/path/to/build/directory')
+
+ Args:
+ device: A DeviceUtils instance.
+ fastbooter: Optional fastboot object. If none is passed, one will
+ be created.
+ default_timeout: An integer containing the default number of seconds to
+ wait for an operation to complete if no explicit value is provided.
+ default_retries: An integer containing the default number or times an
+ operation should be retried on failure if no explicit value is provided.
+ """
+ self._device = device
+ self._board = device.product_board
+ self._serial = str(device)
+ self._default_timeout = default_timeout
+ self._default_retries = default_retries
+ if fastbooter:
+ self.fastboot = fastbooter
+ else:
+ self.fastboot = fastboot.Fastboot(self._serial)
+
+ @decorators.WithTimeoutAndRetriesFromInstance()
+ def WaitForFastbootMode(self, timeout=None, retries=None):
+ """Wait for device to boot into fastboot mode.
+
+ This waits for the device serial to show up in fastboot devices output.
+ """
+ def fastboot_mode():
+ return self._serial in self.fastboot.Devices()
+
+ timeout_retry.WaitFor(fastboot_mode, wait_period=self._FASTBOOT_WAIT_TIME)
+
+ @decorators.WithTimeoutAndRetriesFromInstance(
+ min_default_timeout=_FASTBOOT_REBOOT_TIMEOUT)
+ def EnableFastbootMode(self, timeout=None, retries=None):
+ """Reboots phone into fastboot mode.
+
+ Roots phone if needed, then reboots phone into fastboot mode and waits.
+ """
+ self._device.EnableRoot()
+ self._device.adb.Reboot(to_bootloader=True)
+ self.WaitForFastbootMode()
+
+ @decorators.WithTimeoutAndRetriesFromInstance(
+ min_default_timeout=_FASTBOOT_REBOOT_TIMEOUT)
+ def Reboot(self, bootloader=False, timeout=None, retries=None):
+ """Reboots out of fastboot mode.
+
+ It reboots the phone either back into fastboot, or to a regular boot. It
+ then blocks until the device is ready.
+
+ Args:
+ bootloader: If set to True, reboots back into bootloader.
+ """
+ if bootloader:
+ self.fastboot.RebootBootloader()
+ self.WaitForFastbootMode()
+ else:
+ self.fastboot.Reboot()
+ self._device.WaitUntilFullyBooted(timeout=_FASTBOOT_REBOOT_TIMEOUT)
+
+ def _VerifyBoard(self, directory):
+ """Validate as best as possible that the android build matches the device.
+
+ Goes through build files and checks if the board name is mentioned in the
+ |self._BOARD_VERIFICATION_FILE| or in the build archive.
+
+ Args:
+ directory: directory where build files are located.
+ """
+ files = os.listdir(directory)
+ board_regex = re.compile(r'require board=(\w+)')
+ if self._BOARD_VERIFICATION_FILE in files:
+ with open(os.path.join(directory, self._BOARD_VERIFICATION_FILE)) as f:
+ for line in f:
+ m = board_regex.match(line)
+ if m:
+ board_name = m.group(1)
+ if board_name == self._board:
+ return True
+ elif board_name:
+ return False
+ else:
+ logging.warning('No board type found in %s.',
+ self._BOARD_VERIFICATION_FILE)
+ else:
+ logging.warning('%s not found. Unable to use it to verify device.',
+ self._BOARD_VERIFICATION_FILE)
+
+ zip_regex = re.compile(r'.*%s.*\.zip' % re.escape(self._board))
+ for f in files:
+ if zip_regex.match(f):
+ return True
+
+ return False
+
+ def _FindAndVerifyPartitionsAndImages(self, partitions, directory):
+ """Validate partitions and images.
+
+ Validate all partition names and partition directories. Cannot stop mid
+ flash so its important to validate everything first.
+
+ Args:
+ Partitions: partitions to be tested.
+ directory: directory containing the images.
+
+ Returns:
+ Dictionary with exact partition, image name mapping.
+ """
+ files = os.listdir(directory)
+
+ def find_file(pattern):
+ for filename in files:
+ if fnmatch.fnmatch(filename, pattern):
+ return os.path.join(directory, filename)
+ raise device_errors.FastbootCommandFailedError(
+ 'Failed to flash device. Counld not find image for %s.', pattern)
+
+ return {name: find_file(self._FLASH_IMAGE_FILES[name])
+ for name in partitions}
+
+ def _FlashPartitions(self, partitions, directory, wipe=False, force=False):
+ """Flashes all given partiitons with all given images.
+
+ Args:
+ partitions: List of partitions to flash.
+ directory: Directory where all partitions can be found.
+ wipe: If set to true, will automatically detect if cache and userdata
+ partitions are sent, and if so ignore them.
+ force: boolean to decide to ignore board name safety checks.
+
+ Raises:
+ device_errors.CommandFailedError(): If image cannot be found or if bad
+ partition name is give.
+ """
+ if not self._VerifyBoard(directory):
+ if force:
+ logging.warning('Could not verify build is meant to be installed on '
+ 'the current device type, but force flag is set. '
+ 'Flashing device. Possibly dangerous operation.')
+ else:
+ raise device_errors.CommandFailedError(
+ 'Could not verify build is meant to be installed on the current '
+ 'device type. Run again with force=True to force flashing with an '
+ 'unverified board.')
+
+ flash_image_files = self._FindAndVerifyPartitionsAndImages(partitions,
+ directory)
+ for partition in partitions:
+ if partition in ['cache', 'userdata'] and not wipe:
+ logging.info(
+ 'Not flashing in wipe mode. Skipping partition %s.', partition)
+ else:
+ logging.info(
+ 'Flashing %s with %s', partition, flash_image_files[partition])
+ self.fastboot.Flash(partition, flash_image_files[partition])
+ if partition in self._RESTART_WHEN_FLASHING:
+ self.Reboot(bootloader=True)
+
+ @contextlib.contextmanager
+ def FastbootMode(self, timeout=None, retries=None):
+ """Context manager that enables fastboot mode, and reboots after.
+
+ Example usage:
+ with FastbootMode():
+ Flash Device
+ # Anything that runs after flashing.
+ """
+ self.EnableFastbootMode()
+ self.fastboot.SetOemOffModeCharge(False)
+ try:
+ yield self
+ finally:
+ self.fastboot.SetOemOffModeCharge(True)
+ self.Reboot()
+
+ def FlashDevice(self, directory, partitions=None, wipe=False):
+ """Flash device with build in |directory|.
+
+ Directory must contain bootloader, radio, boot, recovery, system, userdata,
+ and cache .img files from an android build. This is a dangerous operation so
+ use with care.
+
+ Args:
+ fastboot: A FastbootUtils instance.
+ directory: Directory with build files.
+ wipe: Wipes cache and userdata if set to true.
+ partitions: List of partitions to flash. Defaults to all.
+ """
+ if partitions is None:
+ partitions = ALL_PARTITIONS
+ with self.FastbootMode():
+ self._FlashPartitions(partitions, directory, wipe=wipe)