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69 lines
2.3 KiB
69 lines
2.3 KiB
# Copyright 2011 Google Inc. All Rights Reserved. |
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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("Acquiring checksum for '%s'." % |
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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__(cls, *args, |
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**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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