Cache cargo-fuzz between invocations #396
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mgeisler
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This should save us about two minutes when fuzzing since we can reuse the cargo-fuzz binary between runs. While nightly Rust is required to do fuzzing, the cargo-fuzz binary is not linked directly to the precise version of the nightly compiler being used — I’ve been using a 0.8.0 release of cargo-fuzz for months and it seems happy enough. We therefore link the cache with the latest version number of cargo-fuzz itself, thus ensuring that we always use the latest version.
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This should give us an accumulating cache with the fuzz testing corpus. Each run will see a cache miss, and fallback to downloading the most recent cache. After the run, a new cache is uploaded. The caches are small (3-5 MB) and deleted after a week, so the total amount of data used is in the order of 30-40 MB.
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This will make multiple runs on the same day faster since they can
reuse the cache. Fuzzing uses nightly Rust, so the cache will expire
daily.