Where does 6f17d22bba15001f come from in index.crates.io-6f17d22bba15001f

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I'm curious about some of the internals of cargo. Does anyone know how the following id in $CARGO_HOME/registry/cache/index.crates.io-6f17d22bba15001f/ is calculated?

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I believe this is a Metadata hash. It is computed here: cargo/src/cargo/core/compiler/build_runner/compilation_files.rs at 14b46ecc62aa671d7477beba237ad9c6a209cf5d · rust-lang/cargo (github.com) There is some documentation on the Metadata type in this file. And the docs for the fingerprint module are also relevant.

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It’s SipHash of the full type of the index

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