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# -*- coding: utf-8 -*-
# Copyright 2011 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Compute image checksum."""
import os
import threading
from cros_utils import logger
from cros_utils.file_utils import FileUtils
class ImageChecksummer(object):
"""Compute image checksum."""
class PerImageChecksummer(object):
"""Compute checksum for an image."""
def __init__(self, label, log_level):
self._lock = threading.Lock()
self.label = label
self._checksum = None
self.log_level = log_level
def Checksum(self):
with self._lock:
if not self._checksum:
logger.GetLogger().LogOutput(
"Acquiring checksum for '%s'." % self.label.name
)
self._checksum = None
if self.label.image_type != "local":
raise RuntimeError(
"Called Checksum on non-local image!"
)
if self.label.chromeos_image:
if os.path.exists(self.label.chromeos_image):
self._checksum = FileUtils().Md5File(
self.label.chromeos_image,
log_level=self.log_level,
)
logger.GetLogger().LogOutput(
"Computed checksum is " ": %s" % self._checksum
)
if not self._checksum:
raise RuntimeError("Checksum computing error.")
logger.GetLogger().LogOutput(
"Checksum is: %s" % self._checksum
)
return self._checksum
_instance = None
_lock = threading.Lock()
_per_image_checksummers = {}
def __new__(cls, *args, **kwargs):
with cls._lock:
if not cls._instance:
cls._instance = super(ImageChecksummer, cls).__new__(
cls, *args, **kwargs
)
return cls._instance
def Checksum(self, label, log_level):
if label.image_type != "local":
raise RuntimeError("Attempt to call Checksum on non-local image.")
with self._lock:
if label.name not in self._per_image_checksummers:
self._per_image_checksummers[
label.name
] = ImageChecksummer.PerImageChecksummer(label, log_level)
checksummer = self._per_image_checksummers[label.name]
try:
return checksummer.Checksum()
except:
logger.GetLogger().LogError(
"Could not compute checksum of image in label"
" '%s'." % label.name
)
raise
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