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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import hashlib
import struct
import sys
import os
import argparse
def print_code(checksum, func_name):
if len(func_name) == 0: # safe fallback for old ya.make files
func_name = "DecimalMD5"
print 'const char* ' + func_name + '() {return "' + checksum + '";}'
def ensure_paths_exist(paths):
bad_paths = sorted(
path for path in paths
if not os.path.exists(path)
)
if bad_paths:
print >> sys.stderr, "decimal_md5 inputs do not exist:"
for path in bad_paths:
print >> sys.stderr, path
sys.exit(1)
def _update_digest_with_file_contents(digest, path, block_size=65535):
with open(path) as f:
while True:
block = f.read(block_size)
if not block:
break
digest.update(block)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--fixed-output", help="don not calculate md5, use this value instead")
parser.add_argument("--lower-bits", help="use specified count of lower bits", type=int, default=32)
parser.add_argument("--source-root", help="arcadia source root")
parser.add_argument("--func-name", help="custom function name to be defined", default="DecimalMD5")
parser.add_argument("targets", nargs='*', default=['.'])
args = parser.parse_args()
abs_paths = [
os.path.join(args.source_root, target)
for target in args.targets
]
ensure_paths_exist(abs_paths)
if args.fixed_output:
try:
bitmask = (1 << args.lower_bits) - 1
fmt = '{:0%dd}' % len(str(bitmask))
checksum = fmt.format(int(args.fixed_output) & bitmask)
except ValueError:
raise ValueError("decimal_md5: bad value passed via --fixed-output: %s" % args.fixed_output)
print_code(str(checksum), func_name=args.func_name)
return
md5 = hashlib.md5()
for path in abs_paths:
_update_digest_with_file_contents(md5, path)
md5_parts = struct.unpack('IIII', md5.digest())
md5_int = sum(part << (32 * n) for n, part in enumerate(md5_parts))
bitmask = (1 << args.lower_bits) - 1
fmt = '{:0%dd}' % len(str(bitmask))
checksum_str = fmt.format(md5_int & bitmask)
print_code(checksum_str, func_name=args.func_name)
if __name__ == "__main__":
main()
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