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70 lines
2.2 KiB
70 lines
2.2 KiB
4 years ago
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#! /usr/bin/env python3
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# Check that all ".pyc" files exist and are up-to-date
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# Uses module 'os'
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import sys
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import os
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from stat import ST_MTIME
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import importlib.util
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# PEP 3147 compatibility (PYC Repository Directories)
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cache_from_source = (importlib.util.cache_from_source if sys.implementation.cache_tag
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else lambda path: path + 'c')
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def main():
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if len(sys.argv) > 1:
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verbose = (sys.argv[1] == '-v')
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silent = (sys.argv[1] == '-s')
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else:
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verbose = silent = False
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MAGIC = importlib.util.MAGIC_NUMBER
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if not silent:
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print('Using MAGIC word', repr(MAGIC))
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for dirname in sys.path:
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try:
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names = os.listdir(dirname)
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except OSError:
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print('Cannot list directory', repr(dirname))
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continue
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if not silent:
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print('Checking ', repr(dirname), '...')
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for name in sorted(names):
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if name.endswith('.py'):
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name = os.path.join(dirname, name)
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try:
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st = os.stat(name)
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except OSError:
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print('Cannot stat', repr(name))
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continue
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if verbose:
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print('Check', repr(name), '...')
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name_c = cache_from_source(name)
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try:
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with open(name_c, 'rb') as f:
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magic_str = f.read(4)
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mtime_str = f.read(4)
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except IOError:
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print('Cannot open', repr(name_c))
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continue
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if magic_str != MAGIC:
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print('Bad MAGIC word in ".pyc" file', end=' ')
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print(repr(name_c))
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continue
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mtime = get_long(mtime_str)
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if mtime in {0, -1}:
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print('Bad ".pyc" file', repr(name_c))
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elif mtime != st[ST_MTIME]:
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print('Out-of-date ".pyc" file', end=' ')
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print(repr(name_c))
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def get_long(s):
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if len(s) != 4:
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return -1
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return s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24)
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if __name__ == '__main__':
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main()
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