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File Content: `hash.py`

import hashlib
import logging
import sys
from optparse import Values
from typing import List

from pip._internal.cli.base_command import Command
from pip._internal.cli.status_codes import ERROR, SUCCESS
from pip._internal.utils.hashes import FAVORITE_HASH, STRONG_HASHES
from pip._internal.utils.misc import read_chunks, write_output

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.
    """

    usage = "%prog [options] <file> ..."
    ignore_require_venv = True

    def add_options(self) -> None:
        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 {}".format(
                ", ".join(STRONG_HASHES)
            ),
        )
        self.parser.insert_option_group(0, self.cmd_opts)

    def run(self, options: Values, args: List[str]) -> int:
        if not args:
            self.parser.print_usage(sys.stderr)
            return ERROR

        algorithm = options.algorithm
        for path in args:
            write_output(
                "%s:\n--hash=%s:%s", path, algorithm, _hash_of_file(path, algorithm)
            )
        return SUCCESS


def _hash_of_file(path: str, algorithm: str) -> str:
    """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()

Name	Size	Permission
__pycache__	---	0755
__init__.py	3882 bytes	0644
cache.py	7582 bytes	0644
check.py	1685 bytes	0644
completion.py	4129 bytes	0644
configuration.py	9815 bytes	0644
debug.py	6591 bytes	0644
download.py	5289 bytes	0644
freeze.py	2951 bytes	0644
hash.py	1703 bytes	0644
help.py	1132 bytes	0644
index.py	4793 bytes	0644
inspect.py	3188 bytes	0644
install.py	32389 bytes	0644
list.py	12343 bytes	0644
search.py	5697 bytes	0644
show.py	6419 bytes	0644
uninstall.py	3886 bytes	0644
wheel.py	7396 bytes	0644

File Content: hash.py

File Content: `hash.py`