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print('Out-of-date ".pyc" file', end=' ')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