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A file based cache which is safe to use even when the target directory may
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There is a race condition when two processes try to write and/or read the
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same entry at the same time, since each entry consists of two separate
|
files (https://github.com/psf/cachecontrol/issues/324). We therefore have
|
additional logic that makes sure that both files to be present before
|
returning an entry; this fixes the read side of the race condition.
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|
For the write side, we assume that the server will only ever return the
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same data for the same URL, which ought to be the case for files pip is
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