Rust Cache Action

A GitHub Action that implements smart caching for rust/cargo projects with sensible defaults.

Example usage

- uses: Swatinem/rust-cache@v1

Registry Cache

• ~/.cargo/registry/index
• ~/.cargo/registry/cache

This cache is automatically keyed by hashing the Cargo.lock / Cargo.toml files. Before persisting, the cache is cleaned of intermediate artifacts and unneeded dependencies.

TODO: The ~/.cargo/git/db database is not yet persisted, support will be added at a later point.

Target Cache

• ./target

This cache is automatically keyed by:

• the github job,
• the rustc release / host / hash, and
• a hash of the Cargo.lock / Cargo.toml files.

Before persisting, the cache is cleaned of anything that is not a needed dependency. In particular, no caching of workspace crates will be done. For this reason, this action will automatically set CARGO_INCREMENTAL=0 to disable incremental compilation.