74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2011 The Chromium OS Authors. All rights reserved.
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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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from __future__ import print_function
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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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self._checksum = None
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if self.label.image_type != 'local':
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raise RuntimeError('Called Checksum on non-local image!')
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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, log_level=self.log_level)
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logger.GetLogger().LogOutput('Computed checksum is '
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': %s' % self._checksum)
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if not self._checksum:
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raise RuntimeError('Checksum computing error.')
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logger.GetLogger().LogOutput('Checksum is: %s' % self._checksum)
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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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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[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('Could not compute checksum of image in label'
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" '%s'." % label.name)
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raise
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