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annotate planemo/lib/python3.7/site-packages/pip/_internal/commands/hash.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 from __future__ import absolute_import
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2
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3 import hashlib
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4 import logging
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5 import sys
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6
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7 from pip._internal.cli.base_command import Command
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8 from pip._internal.cli.status_codes import ERROR
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9 from pip._internal.utils.hashes import FAVORITE_HASH, STRONG_HASHES
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10 from pip._internal.utils.misc import read_chunks
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11
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12 logger = logging.getLogger(__name__)
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14
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15 class HashCommand(Command):
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16 """
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17 Compute a hash of a local package archive.
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18
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19 These can be used with --hash in a requirements file to do repeatable
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20 installs.
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21
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22 """
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23 name = 'hash'
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24 usage = '%prog [options] <file> ...'
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25 summary = 'Compute hashes of package archives.'
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26 ignore_require_venv = True
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27
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28 def __init__(self, *args, **kw):
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29 super(HashCommand, self).__init__(*args, **kw)
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30 self.cmd_opts.add_option(
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31 '-a', '--algorithm',
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32 dest='algorithm',
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33 choices=STRONG_HASHES,
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34 action='store',
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35 default=FAVORITE_HASH,
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36 help='The hash algorithm to use: one of %s' %
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37 ', '.join(STRONG_HASHES))
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38 self.parser.insert_option_group(0, self.cmd_opts)
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39
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40 def run(self, options, args):
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41 if not args:
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42 self.parser.print_usage(sys.stderr)
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43 return ERROR
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44
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45 algorithm = options.algorithm
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46 for path in args:
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47 logger.info('%s:\n--hash=%s:%s',
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48 path, algorithm, _hash_of_file(path, algorithm))
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50
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51 def _hash_of_file(path, algorithm):
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52 """Return the hash digest of a file."""
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53 with open(path, 'rb') as archive:
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54 hash = hashlib.new(algorithm)
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55 for chunk in read_chunks(archive):
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56 hash.update(chunk)
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57 return hash.hexdigest()