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33 lines
1.5 KiB
Python
33 lines
1.5 KiB
Python
"""Portability checks for host-visible path segments."""
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from __future__ import annotations
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# Windows also treats the ISO-8859-1 superscript digits ¹, ² and ³ as device numbers.
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# https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file
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# CONIN$ and CONOUT$ open the console input and output buffers, not ordinary files.
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# https://learn.microsoft.com/en-us/windows/console/console-handles
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_WINDOWS_RESERVED_NAMES = frozenset({"CON", "PRN", "AUX", "NUL", "CONIN$", "CONOUT$"} | {f"COM{i}" for i in "123456789¹²³"} | {f"LPT{i}" for i in "123456789¹²³"})
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def windows_incompatible_segment(segment: str) -> str | None:
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"""Return a reason when *segment* is unsafe to create as a host path component.
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Reserved device names and trailing dots or spaces are rejected on every
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platform when a name is created: uploads, new custom-skill support files,
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and sandbox writes of a path that is not already stored. Reads, deletes of
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an existing support file, and access to a path that already exists on the
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host do not use this check. Those names alias devices or are silently
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stripped on Windows.
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``.`` and ``..`` are ignored here; callers already reject traversal.
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Do not reject colons, quotes, or control characters here.
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"""
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if segment in {"", ".", ".."}:
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return None
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if segment.endswith((" ", ".")):
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return "trailing dot or space"
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stem = segment.split(".", 1)[0]
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if stem.upper() in _WINDOWS_RESERVED_NAMES:
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return "reserved Windows device name"
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return None
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