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72 lines
1.8 KiB
72 lines
1.8 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2014 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import hashlib
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import logging
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log = logging.getLogger(__name__)
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def md5sum(path):
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"""
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Return the md5sum of an image and cache it on disk
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:param path: Path to the image
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:returns: Digest of the image
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"""
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if path is None or len(path) == 0 or not os.path.exists(path):
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return None
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try:
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with open(path + '.md5sum') as f:
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return f.read()
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except OSError:
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pass
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try:
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m = hashlib.md5()
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with open(path, 'rb') as f:
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while True:
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buf = f.read(128)
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if not buf:
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break
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m.update(buf)
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digest = m.hexdigest()
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except OSError as e:
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log.error("Can't create digest of %s: %s", path, str(e))
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return None
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try:
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with open('{}.md5sum'.format(path), 'w+') as f:
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f.write(digest)
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except OSError as e:
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log.error("Can't write digest of %s: %s", path, str(e))
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return digest
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def remove_checksum(path):
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"""
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Remove the checksum of an image from cache if exists
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"""
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path = '{}.md5sum'.format(path)
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if os.path.exists(path):
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os.remove(path)
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