| # Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| from buildutil import BuildObject |
| from xml.dom import minidom |
| |
| import cherrypy |
| import os |
| import shutil |
| import subprocess |
| import time |
| import urlparse |
| |
| |
| def _LogMessage(message): |
| cherrypy.log(message, 'UPDATE') |
| |
| UPDATE_FILE = 'update.gz' |
| STATEFUL_FILE = 'stateful.tgz' |
| CACHE_DIR = 'cache' |
| |
| |
| def _ChangeUrlPort(url, new_port): |
| """Return the URL passed in with a different port""" |
| scheme, netloc, path, query, fragment = urlparse.urlsplit(url) |
| host_port = netloc.split(':') |
| |
| if len(host_port) == 1: |
| host_port.append(new_port) |
| else: |
| host_port[1] = new_port |
| |
| print host_port |
| netloc = "%s:%s" % tuple(host_port) |
| |
| return urlparse.urlunsplit((scheme, netloc, path, query, fragment)) |
| |
| |
| class Autoupdate(BuildObject): |
| """Class that contains functionality that handles Chrome OS update pings. |
| |
| Members: |
| serve_only: Serve only pre-built updates. static_dir must contain update.gz |
| and stateful.tgz. |
| factory_config: Path to the factory config file if handling factory |
| requests. |
| use_test_image: Use chromiumos_test_image.bin rather than the standard. |
| static_url_base: base URL, other than devserver, for update images. |
| forced_image: Path to an image to use for all updates. |
| forced_payload: Path to pre-generated payload to serve. |
| port: port to host devserver |
| proxy_port: port of local proxy to tell client to connect to you through. |
| src_image: If specified, creates a delta payload from this image. |
| vm: Set for VM images (doesn't patch kernel) |
| board: board for the image. Needed for pre-generating of updates. |
| copy_to_static_root: Copies images generated from the cache to |
| ~/static. |
| """ |
| |
| def __init__(self, serve_only=None, test_image=False, urlbase=None, |
| factory_config_path=None, |
| forced_image=None, forced_payload=None, |
| port=8080, proxy_port=None, src_image='', vm=False, board=None, |
| copy_to_static_root=True, private_key=None, |
| *args, **kwargs): |
| super(Autoupdate, self).__init__(*args, **kwargs) |
| self.serve_only = serve_only |
| self.factory_config = factory_config_path |
| self.use_test_image = test_image |
| if urlbase: |
| self.urlbase = urlbase |
| else: |
| self.urlbase = None |
| |
| self.forced_image = forced_image |
| self.forced_payload = forced_payload |
| self.src_image = src_image |
| self.proxy_port = proxy_port |
| self.vm = vm |
| self.board = board |
| self.copy_to_static_root = copy_to_static_root |
| self.private_key = private_key |
| |
| # Path to pre-generated file. |
| self.pregenerated_path = None |
| |
| def _GetSecondsSinceMidnight(self): |
| """Returns the seconds since midnight as a decimal value.""" |
| now = time.localtime() |
| return now[3] * 3600 + now[4] * 60 + now[5] |
| |
| def _GetDefaultBoardID(self): |
| """Returns the default board id stored in .default_board.""" |
| board_file = '%s/.default_board' % (self.scripts_dir) |
| try: |
| return open(board_file).read() |
| except IOError: |
| return 'x86-generic' |
| |
| def _GetLatestImageDir(self, board_id): |
| """Returns the latest image dir based on shell script.""" |
| cmd = '%s/get_latest_image.sh --board %s' % (self.scripts_dir, board_id) |
| return os.popen(cmd).read().strip() |
| |
| def _GetVersionFromDir(self, image_dir): |
| """Returns the version of the image based on the name of the directory.""" |
| latest_version = os.path.basename(image_dir) |
| return latest_version.split('-')[0] |
| |
| def _CanUpdate(self, client_version, latest_version): |
| """Returns true if the latest_version is greater than the client_version. |
| """ |
| client_tokens = client_version.replace('_', '').split('.') |
| latest_tokens = latest_version.replace('_', '').split('.') |
| _LogMessage('client version %s latest version %s' |
| % (client_version, latest_version)) |
| for i in range(4): |
| if int(latest_tokens[i]) == int(client_tokens[i]): |
| continue |
| return int(latest_tokens[i]) > int(client_tokens[i]) |
| return False |
| |
| def _UnpackZip(self, image_dir): |
| """Unpacks an image.zip into a given directory.""" |
| image = os.path.join(image_dir, self._GetImageName()) |
| if os.path.exists(image): |
| return True |
| else: |
| # -n, never clobber an existing file, in case we get invoked |
| # simultaneously by multiple request handlers. This means that |
| # we're assuming each image.zip file lives in a versioned |
| # directory (a la Buildbot). |
| return os.system('cd %s && unzip -n image.zip' % image_dir) == 0 |
| |
| def _GetImageName(self): |
| """Returns the name of the image that should be used.""" |
| if self.use_test_image: |
| image_name = 'chromiumos_test_image.bin' |
| else: |
| image_name = 'chromiumos_image.bin' |
| return image_name |
| |
| def _GetSize(self, update_path): |
| """Returns the size of the file given.""" |
| return os.path.getsize(update_path) |
| |
| def _GetHash(self, update_path): |
| """Returns the sha1 of the file given.""" |
| cmd = ('cat %s | openssl sha1 -binary | openssl base64 | tr \'\\n\' \' \';' |
| % update_path) |
| return os.popen(cmd).read().rstrip() |
| |
| def _IsDeltaFormatFile(self, filename): |
| try: |
| file_handle = open(filename, 'r') |
| delta_magic = 'CrAU' |
| magic = file_handle.read(len(delta_magic)) |
| return magic == delta_magic |
| except Exception: |
| return False |
| |
| # TODO(petkov): Consider optimizing getting both SHA-1 and SHA-256 so that |
| # it takes advantage of reduced I/O and multiple processors. Something like: |
| # % tee < FILE > /dev/null \ |
| # >( openssl dgst -sha256 -binary | openssl base64 ) \ |
| # >( openssl sha1 -binary | openssl base64 ) |
| def _GetSHA256(self, update_path): |
| """Returns the sha256 of the file given.""" |
| cmd = ('cat %s | openssl dgst -sha256 -binary | openssl base64' % |
| update_path) |
| return os.popen(cmd).read().rstrip() |
| |
| def _GetMd5(self, update_path): |
| """Returns the md5 checksum of the file given.""" |
| cmd = ("md5sum %s | awk '{print $1}'" % update_path) |
| return os.popen(cmd).read().rstrip() |
| |
| def _Copy(self, source, dest): |
| """Copies a file from dest to source (if different)""" |
| _LogMessage('Copy File %s -> %s' % (source, dest)) |
| if os.path.lexists(dest): |
| os.remove(dest) |
| shutil.copy(source, dest) |
| |
| def GetUpdatePayload(self, hash, sha256, size, url, is_delta_format): |
| """Returns a payload to the client corresponding to a new update. |
| |
| Args: |
| hash: hash of update blob |
| sha256: SHA-256 hash of update blob |
| size: size of update blob |
| url: where to find update blob |
| Returns: |
| Xml string to be passed back to client. |
| """ |
| delta = 'false' |
| if is_delta_format: |
| delta = 'true' |
| payload = """<?xml version="1.0" encoding="UTF-8"?> |
| <gupdate xmlns="http://www.google.com/update2/response" protocol="2.0"> |
| <daystart elapsed_seconds="%s"/> |
| <app appid="{%s}" status="ok"> |
| <ping status="ok"/> |
| <updatecheck |
| codebase="%s" |
| hash="%s" |
| sha256="%s" |
| needsadmin="false" |
| size="%s" |
| IsDelta="%s" |
| status="ok"/> |
| </app> |
| </gupdate> |
| """ |
| return payload % (self._GetSecondsSinceMidnight(), |
| self.app_id, url, hash, sha256, size, delta) |
| |
| def GetNoUpdatePayload(self): |
| """Returns a payload to the client corresponding to no update.""" |
| payload = """<?xml version="1.0" encoding="UTF-8"?> |
| <gupdate xmlns="http://www.google.com/update2/response" protocol="2.0"> |
| <daystart elapsed_seconds="%s"/> |
| <app appid="{%s}" status="ok"> |
| <ping status="ok"/> |
| <updatecheck status="noupdate"/> |
| </app> |
| </gupdate> |
| """ |
| return payload % (self._GetSecondsSinceMidnight(), self.app_id) |
| |
| def GenerateUpdateFile(self, src_image, image_path, output_dir): |
| """Generates an update gz given a full path to an image. |
| |
| Args: |
| image_path: Full path to image. |
| Returns: |
| Path to created update_payload or None on error. |
| """ |
| update_path = os.path.join(output_dir, UPDATE_FILE) |
| _LogMessage('Generating update image %s' % update_path) |
| |
| update_command = [ |
| '%s/cros_generate_update_payload' % self.devserver_dir, |
| '--image="%s"' % image_path, |
| '--output="%s"' % update_path, |
| ] |
| |
| if src_image: update_command.append('--src_image="%s"' % src_image) |
| if not self.vm: update_command.append('--patch_kernel') |
| if self.private_key: update_command.append('--private_key="%s"' % |
| self.private_key) |
| |
| update_string = ' '.join(update_command) |
| _LogMessage('Running ' + update_string) |
| if os.system(update_string) != 0: |
| _LogMessage('Failed to create update payload') |
| return None |
| |
| return UPDATE_FILE |
| |
| def GenerateStatefulFile(self, image_path, output_dir): |
| """Generates a stateful update payload given a full path to an image. |
| |
| Args: |
| image_path: Full path to image. |
| Returns: |
| Path to created stateful update_payload or None on error. |
| Raises: |
| A subprocess exception if the update generator fails to generate a |
| stateful payload. |
| """ |
| output_gz = os.path.join(output_dir, STATEFUL_FILE) |
| subprocess.check_call( |
| ['%s/cros_generate_stateful_update_payload' % self.devserver_dir, |
| '--image=%s' % image_path, |
| '--output_dir=%s' % output_dir, |
| ]) |
| return STATEFUL_FILE |
| |
| def FindCachedUpdateImageSubDir(self, src_image, dest_image): |
| """Find directory to store a cached update. |
| |
| Given one, or two images for an update, this finds which |
| cache directory should hold the update files, even if they don't exist |
| yet. The directory will be inside static_image_dir, and of the form: |
| |
| Non-delta updates: |
| CACHE_DIR/12345678 |
| |
| Delta updates: |
| CACHE_DIR/12345678_12345678 |
| """ |
| # If there is no src, we only have an image file, check image for changes |
| if not src_image: |
| return os.path.join(CACHE_DIR, self._GetMd5(dest_image)) |
| |
| # If we have src and dest, we are a delta, and check both for changes |
| return os.path.join(CACHE_DIR, |
| "%s_%s" % (self._GetMd5(src_image), |
| self._GetMd5(dest_image))) |
| |
| def GenerateUpdateImage(self, image_path, output_dir): |
| """Force generates an update payload based on the given image_path. |
| |
| Args: |
| src_image: image we are updating from (Null/empty for non-delta) |
| image_path: full path to the image. |
| output_dir: the directory to write the update payloads in |
| Returns: |
| update payload name relative to output_dir |
| """ |
| update_file = None |
| stateful_update_file = None |
| |
| # Actually do the generation |
| _LogMessage('Generating update for image %s' % image_path) |
| update_file = self.GenerateUpdateFile(self.src_image, |
| image_path, |
| output_dir) |
| |
| if update_file: |
| stateful_update_file = self.GenerateStatefulFile(image_path, |
| output_dir) |
| |
| if update_file and stateful_update_file: |
| return update_file |
| else: |
| _LogMessage('Failed to generate update.') |
| return None |
| |
| def GenerateUpdateImageWithCache(self, image_path, static_image_dir): |
| """Force generates an update payload based on the given image_path. |
| |
| Args: |
| image_path: full path to the image. |
| static_image_dir: the directory to move images to after generating. |
| Returns: |
| update filename (not directory) relative to static_image_dir on success, |
| or None. |
| """ |
| _LogMessage('Generating update for src %s image %s' % (self.src_image, |
| image_path)) |
| |
| # If it was pregenerated_path, don't regenerate |
| if self.pregenerated_path: |
| return self.pregenerated_path |
| |
| # Which sub_dir of static_image_dir should hold our cached update image |
| cache_sub_dir = self.FindCachedUpdateImageSubDir(self.src_image, image_path) |
| _LogMessage('Caching in sub_dir "%s"' % cache_sub_dir) |
| |
| update_path = os.path.join(cache_sub_dir, UPDATE_FILE) |
| |
| # The cached payloads exist in a cache dir |
| cache_update_payload = os.path.join(static_image_dir, |
| update_path) |
| cache_stateful_payload = os.path.join(static_image_dir, |
| cache_sub_dir, |
| STATEFUL_FILE) |
| |
| # Check to see if this cache directory is valid. |
| if not os.path.exists(cache_update_payload) or not os.path.exists( |
| cache_stateful_payload): |
| full_cache_dir = os.path.join(static_image_dir, cache_sub_dir) |
| # Clean up stale state. |
| os.system('rm -rf "%s"' % full_cache_dir) |
| os.makedirs(full_cache_dir) |
| return_path = self.GenerateUpdateImage(image_path, |
| full_cache_dir) |
| |
| # Clean up cache dir since it's not valid. |
| if not return_path: |
| os.system('rm -rf "%s"' % full_cache_dir) |
| return None |
| |
| self.pregenerated_path = update_path |
| |
| # Generation complete, copy if requested. |
| if self.copy_to_static_root: |
| # The final results exist directly in static |
| update_payload = os.path.join(static_image_dir, |
| UPDATE_FILE) |
| stateful_payload = os.path.join(static_image_dir, |
| STATEFUL_FILE) |
| self._Copy(cache_update_payload, update_payload) |
| self._Copy(cache_stateful_payload, stateful_payload) |
| return UPDATE_FILE |
| else: |
| return self.pregenerated_path |
| |
| def GenerateLatestUpdateImage(self, board_id, client_version, |
| static_image_dir): |
| """Generates an update using the latest image that has been built. |
| |
| This will only generate an update if the newest update is newer than that |
| on the client or client_version is 'ForcedUpdate'. |
| |
| Args: |
| board_id: Name of the board. |
| client_version: Current version of the client or 'ForcedUpdate' |
| static_image_dir: the directory to move images to after generating. |
| Returns: |
| Name of the update image relative to static_image_dir or None |
| """ |
| latest_image_dir = self._GetLatestImageDir(board_id) |
| latest_version = self._GetVersionFromDir(latest_image_dir) |
| latest_image_path = os.path.join(latest_image_dir, self._GetImageName()) |
| |
| _LogMessage('Preparing to generate update from latest built image %s.' % |
| latest_image_path) |
| |
| # Check to see whether or not we should update. |
| if client_version != 'ForcedUpdate' and not self._CanUpdate( |
| client_version, latest_version): |
| _LogMessage('no update') |
| return None |
| |
| return self.GenerateUpdateImageWithCache(latest_image_path, |
| static_image_dir=static_image_dir) |
| |
| def ImportFactoryConfigFile(self, filename, validate_checksums=False): |
| """Imports a factory-floor server configuration file. The file should |
| be in this format: |
| config = [ |
| { |
| 'qual_ids': set([1, 2, 3, "x86-generic"]), |
| 'factory_image': 'generic-factory.gz', |
| 'factory_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'release_image': 'generic-release.gz', |
| 'release_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'oempartitionimg_image': 'generic-oem.gz', |
| 'oempartitionimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'efipartitionimg_image': 'generic-efi.gz', |
| 'efipartitionimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'stateimg_image': 'generic-state.gz', |
| 'stateimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'firmware_image': 'generic-firmware.gz', |
| 'firmware_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| }, |
| { |
| 'qual_ids': set([6]), |
| 'factory_image': '6-factory.gz', |
| 'factory_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'release_image': '6-release.gz', |
| 'release_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'oempartitionimg_image': '6-oem.gz', |
| 'oempartitionimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'efipartitionimg_image': '6-efi.gz', |
| 'efipartitionimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'stateimg_image': '6-state.gz', |
| 'stateimg_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| 'firmware_image': '6-firmware.gz', |
| 'firmware_checksum': 'AtiI8B64agHVN+yeBAyiNMX3+HM=', |
| }, |
| ] |
| The server will look for the files by name in the static files |
| directory. |
| |
| If validate_checksums is True, validates checksums and exits. If |
| a checksum mismatch is found, it's printed to the screen. |
| """ |
| f = open(filename, 'r') |
| output = {} |
| exec(f.read(), output) |
| self.factory_config = output['config'] |
| success = True |
| for stanza in self.factory_config: |
| for key in stanza.copy().iterkeys(): |
| suffix = '_image' |
| if key.endswith(suffix): |
| kind = key[:-len(suffix)] |
| stanza[kind + '_size'] = self._GetSize(os.path.join( |
| self.static_dir, stanza[kind + '_image'])) |
| if validate_checksums: |
| factory_checksum = self._GetHash(os.path.join(self.static_dir, |
| stanza[kind + '_image'])) |
| if factory_checksum != stanza[kind + '_checksum']: |
| print ('Error: checksum mismatch for %s. Expected "%s" but file ' |
| 'has checksum "%s".' % (stanza[kind + '_image'], |
| stanza[kind + '_checksum'], |
| factory_checksum)) |
| success = False |
| |
| if validate_checksums: |
| if success is False: |
| raise Exception('Checksum mismatch in conf file.') |
| |
| print 'Config file looks good.' |
| |
| def GetFactoryImage(self, board_id, channel): |
| kind = channel.rsplit('-', 1)[0] |
| for stanza in self.factory_config: |
| if board_id not in stanza['qual_ids']: |
| continue |
| if kind + '_image' not in stanza: |
| break |
| return (stanza[kind + '_image'], |
| stanza[kind + '_checksum'], |
| stanza[kind + '_size']) |
| return (None, None, None) |
| |
| def HandleFactoryRequest(self, board_id, channel): |
| (filename, checksum, size) = self.GetFactoryImage(board_id, channel) |
| if filename is None: |
| _LogMessage('unable to find image for board %s' % board_id) |
| return self.GetNoUpdatePayload() |
| url = '%s/static/%s' % (self.hostname, filename) |
| is_delta_format = self._IsDeltaFormatFile(filename) |
| _LogMessage('returning update payload ' + url) |
| # Factory install is using memento updater which is using the sha-1 hash so |
| # setting sha-256 to an empty string. |
| return self.GetUpdatePayload(checksum, '', size, url, is_delta_format) |
| |
| def GenerateUpdatePayloadForNonFactory(self, board_id, client_version, |
| static_image_dir): |
| """Generates an update for non-factory image. |
| |
| Returns: |
| file name relative to static_image_dir on success. |
| """ |
| dest_path = os.path.join(static_image_dir, UPDATE_FILE) |
| dest_stateful = os.path.join(static_image_dir, STATEFUL_FILE) |
| |
| if self.forced_payload: |
| # If the forced payload is not already in our static_image_dir, |
| # copy it there. |
| src_path = os.path.abspath(self.forced_payload) |
| src_stateful = os.path.join(os.path.dirname(src_path), |
| STATEFUL_FILE) |
| |
| # Only copy the files if the source directory is different from dest. |
| if os.path.dirname(src_path) != os.path.abspath(static_image_dir): |
| self._Copy(src_path, dest_path) |
| |
| # The stateful payload is optional. |
| if os.path.exists(src_stateful): |
| self._Copy(src_stateful, dest_stateful) |
| else: |
| _LogMessage('WARN: %s not found. Expected for dev and test builds.' % |
| STATEFUL_FILE) |
| if os.path.exists(dest_stateful): |
| os.remove(dest_stateful) |
| |
| return UPDATE_FILE |
| elif self.forced_image: |
| return self.GenerateUpdateImageWithCache( |
| self.forced_image, |
| static_image_dir=static_image_dir) |
| elif self.serve_only: |
| # Warn if update or stateful files can't be found. |
| if not os.path.exists(dest_path): |
| _LogMessage('WARN: %s not found. Expected for dev and test builds.' % |
| UPDATE_FILE) |
| |
| if not os.path.exists(dest_stateful): |
| _LogMessage('WARN: %s not found. Expected for dev and test builds.' % |
| STATEFUL_FILE) |
| |
| return UPDATE_FILE |
| else: |
| if board_id: |
| return self.GenerateLatestUpdateImage(board_id, |
| client_version, |
| static_image_dir) |
| |
| _LogMessage('Failed to genereate update. ' |
| 'You must set --board when pre-generating latest update.') |
| return None |
| |
| def PreGenerateUpdate(self): |
| """Pre-generates an update and prints out the relative path it. |
| |
| Returns relative path of the update on success. |
| """ |
| # Does not work with factory config. |
| assert(not self.factory_config) |
| _LogMessage('Pre-generating the update payload.') |
| # Does not work with labels so just use static dir. |
| pregenerated_update = self.GenerateUpdatePayloadForNonFactory( |
| self.board, '0.0.0.0', self.static_dir) |
| if pregenerated_update: |
| print 'PREGENERATED_UPDATE=%s' % pregenerated_update |
| |
| return pregenerated_update |
| |
| def HandleUpdatePing(self, data, label=None): |
| """Handles an update ping from an update client. |
| |
| Args: |
| data: xml blob from client. |
| label: optional label for the update. |
| Returns: |
| Update payload message for client. |
| """ |
| # Set hostname as the hostname that the client is calling to and set up |
| # the url base. |
| self.hostname = cherrypy.request.base |
| if self.urlbase: |
| static_urlbase = self.urlbase |
| elif self.serve_only: |
| static_urlbase = '%s/static/archive' % self.hostname |
| else: |
| static_urlbase = '%s/static' % self.hostname |
| |
| # If we have a proxy port, adjust the URL we instruct the client to |
| # use to go through the proxy. |
| if self.proxy_port: |
| static_urlbase = _ChangeUrlPort(static_urlbase, self.proxy_port) |
| |
| _LogMessage('Using static url base %s' % static_urlbase) |
| _LogMessage('Handling update ping as %s: %s' % (self.hostname, data)) |
| |
| update_dom = minidom.parseString(data) |
| root = update_dom.firstChild |
| |
| # We only generate update payloads for updatecheck requests. |
| update_check = root.getElementsByTagName('o:updatecheck') |
| if not update_check: |
| _LogMessage('Non-update check received. Returning blank payload.') |
| # TODO(sosa): Generate correct non-updatecheck payload to better test |
| # update clients. |
| return self.GetNoUpdatePayload() |
| |
| # Since this is an updatecheck, get information about the requester. |
| query = root.getElementsByTagName('o:app')[0] |
| client_version = query.getAttribute('version') |
| channel = query.getAttribute('track') |
| board_id = (query.hasAttribute('board') and query.getAttribute('board') |
| or self._GetDefaultBoardID()) |
| |
| # Separate logic as Factory requests have static url's that override |
| # other options. |
| if self.factory_config: |
| return self.HandleFactoryRequest(board_id, channel) |
| else: |
| static_image_dir = self.static_dir |
| if label: |
| static_image_dir = os.path.join(static_image_dir, label) |
| |
| payload_path = self.GenerateUpdatePayloadForNonFactory(board_id, |
| client_version, |
| static_image_dir) |
| if payload_path: |
| filename = os.path.join(static_image_dir, payload_path) |
| hash = self._GetHash(filename) |
| sha256 = self._GetSHA256(filename) |
| size = self._GetSize(filename) |
| is_delta_format = self._IsDeltaFormatFile(filename) |
| if label: |
| url = '%s/%s/%s' % (static_urlbase, label, payload_path) |
| else: |
| url = '%s/%s' % (static_urlbase, payload_path) |
| |
| _LogMessage('Responding to client to use url %s to get image.' % url) |
| return self.GetUpdatePayload(hash, sha256, size, url, is_delta_format) |
| else: |
| return self.GetNoUpdatePayload() |
