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