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Update our cache with the actually existing packs on disk. Add new ones,
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does not appear to have changed according to its modification timestamp.
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}|d S rE r" rF s r rH z%PackedDB.entities.. s 333DQ333r )r r( s r r> zPackedDB.entities s 33DN3333r c , d}| j D ]x}|d || }|F|d | }|r||k rt | |}y|r|S t | )a :return: 20 byte sha as inferred by the given partial binary sha
:param partial_binsha: binary sha with less than 20 bytes
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had an odd or even number of characters
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