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import hashlib |
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import logging |
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import sys |
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from optparse import Values |
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from typing import List |
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from pip._internal.cli.base_command import Command |
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from pip._internal.cli.status_codes import ERROR, SUCCESS |
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from pip._internal.utils.hashes import FAVORITE_HASH, STRONG_HASHES |
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from pip._internal.utils.misc import read_chunks, write_output |
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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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usage = "%prog [options] <file> ..." |
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ignore_require_venv = True |
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def add_options(self) -> None: |
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self.cmd_opts.add_option( |
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"-a", |
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"--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 {}".format( |
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", ".join(STRONG_HASHES) |
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), |
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) |
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self.parser.insert_option_group(0, self.cmd_opts) |
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def run(self, options: Values, args: List[str]) -> int: |
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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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write_output( |
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"%s:\n--hash=%s:%s", path, algorithm, _hash_of_file(path, algorithm) |
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) |
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return SUCCESS |
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def _hash_of_file(path: str, algorithm: str) -> str: |
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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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