cpython/Tools/scripts/checkpyc.py at v3.6.15 · python/cpython · GitHub

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#! /usr/bin/env python3

# Check that all ".pyc" files exist and are up-to-date

# Uses module 'os'

import sys

import os

from stat import ST_MTIME

import importlib.util

# PEP 3147 compatibility (PYC Repository Directories)

cache_from_source = (importlib.util.cache_from_source if sys.implementation.cache_tag

else lambda path: path + 'c')

def main():

if len(sys.argv) > 1:

verbose = (sys.argv[1] == '-v')

silent = (sys.argv[1] == '-s')

else:

verbose = silent = False

MAGIC = importlib.util.MAGIC_NUMBER

if not silent:

print('Using MAGIC word', repr(MAGIC))

for dirname in sys.path:

try:

names = os.listdir(dirname)

except OSError:

print('Cannot list directory', repr(dirname))

continue

if not silent:

print('Checking ', repr(dirname), '...')

for name in sorted(names):

if name.endswith('.py'):

name = os.path.join(dirname, name)

try:

st = os.stat(name)

except OSError:

print('Cannot stat', repr(name))

continue

if verbose:

print('Check', repr(name), '...')

name_c = cache_from_source(name)

try:

with open(name_c, 'rb') as f:

magic_str = f.read(4)

mtime_str = f.read(4)

except IOError:

print('Cannot open', repr(name_c))

continue

if magic_str != MAGIC:

print('Bad MAGIC word in ".pyc" file', end=' ')

print(repr(name_c))

continue

mtime = get_long(mtime_str)

if mtime in {0, -1}:

print('Bad ".pyc" file', repr(name_c))

elif mtime != st[ST_MTIME]:

print('Out-of-date ".pyc" file', end=' ')

print(repr(name_c))

def get_long(s):

if len(s) != 4:

return -1

return s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)

if __name__ == '__main__':

main()

cpython/Tools/scripts/checkpyc.py at v3.6.15 · python/cpython · GitHub

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