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