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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()
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