Commits on Oct 10, 2023

1. Add global expanded APK cache …

   This dedupes fetching and expansion of APKs to avoid simultaneous builds
   doing a lot of duplicate expensive work. As a bonus, we also deduplicate
   indexing an APK's tar headers so we do it once per APK per process
   instead of every time we open an APK.
   
   The caching mechanisms that already existed are very useful for cache
   hits on subsequent builds, but there was still some overhead loading
   things from disk per cache hit. We avoid most of that now. There was
   also no coordination across builds when fetching indexes, keys, and
   APKs. Now, we should only fetch or load any given thing one time, which
   will reduce the number of requests we send out to the internet but also
   a lot of CPU in gunzip and untar.
   
   Signed-off-by: Jon Johnson <[email protected]>

   

   jonjohnsonjr committed Oct 10, 2023
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