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from __future__ import annotations
import os
import stat
def raise_on_exist_ro_file(filename: str) -> None:
try:
file_stat = os.stat(filename) # use stat to do exists + can write to check without race condition
except OSError:
return None # swallow does not exist or other errors
if file_stat.st_mtime != 0: # if os.stat returns but modification is zero that's an invalid os.stat - ignore it
if not (file_stat.st_mode & stat.S_IWUSR):
raise PermissionError(f"Permission denied: {filename!r}")
__all__ = [
"raise_on_exist_ro_file",
]