Do not use the absolute path to cache wheel extensions. #226
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Wheel names can be long and paths to mounted wheels can be long. Previously `util.path_to_cache_dir()` was unconditionally building cache paths using the absolute path of the cache directory joined with the absolute path to a wheel being mounted. This makes it very easy to generate in huge paths that exceed the maximum path length (MAX_PATH) on Windows machines without the [registry change](https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry) to support long paths. A user-wide shared location for cached data is potentially easy enough to poison with incorrect extensions, so using the absolute path of a wheel being mounted to cache extensions doesn't seem to add any more protection and results in very long hard to read paths that can exceed Windows path limits in out of the box installations. Fixes pypa#224
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Wheel names can be long and paths to mounted wheels can be long. Previously
util.path_to_cache_dir()was unconditionally building cache paths using the absolute path of the cache directory joined with the absolute path to a wheel being mounted. This makes it very easy to generate in huge paths that exceed the maximum path length (MAX_PATH) on Windows machines without theregistry change to support long paths.
A user-wide shared location for cached data is potentially easy enough to poison with incorrect extensions, so using the absolute path of a wheel being mounted to cache extensions doesn't seem to add any more protection and results in very long hard to read paths that can exceed Windows path limits in out of the box installations.
Fixes #224