Загрузка данных
#!/usr/bin/env python3
import sys
import os
STATS_FILE = "chown_stats.txt"
def load_stats():
if not os.path.exists(STATS_FILE):
return 0, 0
try:
with open(STATS_FILE, "r") as f:
data = f.read().split()
if len(data) == 3:
return int(data[0]), int(data[1])
except Exception:
pass
return 0, 0
def save_stats(success, failed):
try:
with open(STATS_FILE, "w") as f:
f.write(f"{success} {failed} {success + failed}\n")
except Exception:
pass
def is_valid_name(s):
if not s:
return False
if s.isdigit():
return True
for char in s:
if not (char.isalnum() or char == '-'):
return False
if s[0].isdigit():
return False
return True
def validate_spec(spec):
if ':' not in spec:
return is_valid_name(spec)
parts = spec.split(':')
if len(parts) > 2:
return False
owner_part, group_part = parts[0], parts[1]
if not owner_part and not group_part:
return False
valid = True
if owner_part:
valid = valid and is_valid_name(owner_part)
if group_part:
valid = valid and is_valid_name(group_part)
return valid
def parse_and_validate(line):
tokens = line.strip().split()
if not tokens:
return False
if tokens[0] != 'chown':
return False
has_help_version = False
has_reference_key = False
has_no_dereference = False
key_end_index = 1
valid_short_chars = set(['c', 'f', 'v', 'h', 'R', 'H', 'L', 'P'])
valid_long_no_param = set([
'--changes', '--silent', '--quiet', '--verbose',
'--dereference', '--no-preserve-root', '--preserve-root'
])
while key_end_index < len(tokens):
tok = tokens[key_end_index]
if tok.startswith('-'):
if tok in ('-', '--'):
return False
if tok.startswith('--'):
if tok in ('--help', '--version'):
has_help_version = True
elif tok == '--no-dereference':
has_no_dereference = True
elif tok in valid_long_no_param:
pass
elif tok.startswith('--from='):
if not validate_spec(tok[7:]):
return False
elif tok.startswith('--reference='):
if len(tok) <= 12:
return False
has_reference_key = True
else:
return False
else:
for char in tok[1:]:
if char == 'h':
has_no_dereference = True
if char not in valid_short_chars:
return False
key_end_index += 1
else:
break
if has_help_version:
return True
rem = len(tokens) - key_end_index
if has_reference_key:
return rem >= 1
elif has_no_dereference and rem == 1:
return validate_spec(tokens[key_end_index])
else:
if rem < 2:
return False
return validate_spec(tokens[key_end_index])
def main():
for line in sys.stdin:
line = line.rstrip('\r\n')
if not line:
continue
if line == 'getstats':
success, failed = load_stats()
print(f"{success} {failed} {success + failed}")
sys.stdout.flush()
continue
if line == 'getsuccess':
print(load_stats()[0])
sys.stdout.flush()
continue
if line == 'getfailed':
print(load_stats()[1])
sys.stdout.flush()
continue
if line == 'resetstats':
save_stats(0, 0)
print()
sys.stdout.flush()
continue
valid = parse_and_validate(line)
success, failed = load_stats()
if valid:
success += 1
print("True")
else:
failed += 1
print("False")
save_stats(success, failed)
sys.stdout.flush()
if __name__ == '__main__':
main()