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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() | |