cache: keep cache keys within the cache directory - #14884
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Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Keys were joined onto the cache directory without normalization, so an absolute or ".."-containing key resolved somewhere else entirely, and ``set()`` created the missing parents there. Normalize the joined path and check containment instead. ``mkdir()`` only rejected path separators, which ".." passes as a single part, and ``--cache-show`` globbed with the same lack of normalization. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Cachejoined keys onto the cache directory without normalizing them, so a keythat was absolute or contained
..resolved outside it —set()then alsocreated the missing parent directories at that location.
_getvaluepath()normalizes the joined path and checks containment, soget()/set()reject escaping keys while a..that cancels out within thevalues directory still works.
mkdir()used the same check; it previously only rejected path separators,which
..passes as a single part.--cache-showglobs are filtered the same way —rglob()follows..segments in the pattern.
Note
Path.is_absolute()is not sufficient on Windows: a rooted-but-drivelesskey like
/xreportsFalseyet still replaces the base injoinpath().Normalizing the joined path covers that without enumerating path flavours.