forked from s434596/CatOrNot
58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from __future__ import absolute_import
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import hashlib
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import logging
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import sys
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from pip.basecommand import Command
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from pip.status_codes import ERROR
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from pip.utils import read_chunks
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from pip.utils.hashes import FAVORITE_HASH, STRONG_HASHES
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logger = logging.getLogger(__name__)
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class HashCommand(Command):
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"""
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Compute a hash of a local package archive.
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These can be used with --hash in a requirements file to do repeatable
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installs.
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"""
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name = 'hash'
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usage = '%prog [options] <file> ...'
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summary = 'Compute hashes of package archives.'
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def __init__(self, *args, **kw):
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super(HashCommand, self).__init__(*args, **kw)
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self.cmd_opts.add_option(
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'-a', '--algorithm',
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dest='algorithm',
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choices=STRONG_HASHES,
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action='store',
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default=FAVORITE_HASH,
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help='The hash algorithm to use: one of %s' %
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', '.join(STRONG_HASHES))
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self.parser.insert_option_group(0, self.cmd_opts)
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def run(self, options, args):
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if not args:
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self.parser.print_usage(sys.stderr)
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return ERROR
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algorithm = options.algorithm
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for path in args:
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logger.info('%s:\n--hash=%s:%s',
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path, algorithm, _hash_of_file(path, algorithm))
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def _hash_of_file(path, algorithm):
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"""Return the hash digest of a file."""
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with open(path, 'rb') as archive:
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hash = hashlib.new(algorithm)
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for chunk in read_chunks(archive):
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hash.update(chunk)
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return hash.hexdigest()
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