scheibelp e5b8312de3 Auto install available pre-built packages from binary cache (#5242) ... * basic functionality to install spec from a binary cache when it's available; this spiders each cache for each package and could likely be more efficient by caching the results of the first check * add spec to db after installing from binary cache * cache (in memory) spec listings retrieved from binary caches * print a warning vs. failing when no mirrors are configured to retrieve pre-built Spack packages * make automatic retrieval of pre-built spack packages from mirrors optional * no code was using the links stored in the dictionary returned by get_specs, so this simplifies the logic to return only a set of specs * print package prefix after installing from binary cache * provide more information to user on install progress		2017-10-30 14:16:46 -07:00
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spack	Auto install available pre-built packages from binary cache (#5242)	2017-10-30 14:16:46 -07:00