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