cargo-chef

Cache the dependencies of your Rust project and speed up your Docker builds.

Table of Contents

0. How to install
1. How to use
2. Limitations
3. License

How To Install

You can install cargo-chef from crates.io with

cargo install cargo-chef

How to use

cargo-chef exposes two commands: prepare and cook:

cargo chef --help

cargo-chef

USAGE:
    cargo chef <SUBCOMMAND>

SUBCOMMANDS:
    cook       Re-hydrate the minimum project skeleton identified by `cargo chef prepare` and
               build it to cache dependencies
    prepare    Analyze the current project to determine the minimum subset of files (Cargo.lock
               and Cargo.toml manifests) required to build it and cache dependencies

prepare examines your project and builds a recipe that captures the set of information required to build your dependencies.

cargo chef prepare --recipe-path recipe.json

Nothing too mysterious going on here, you can examine the recipe.json file: it contains the skeleton of your project (e.g. all the Cargo.toml files with their relative path, the Cargo.lock file is available) plus a few additional pieces of information.
In particular it makes sure that all libraries and binaries are explicitly declared in their respective Cargo.toml files even if they can be found at the canonical default location (src/main.rs for a binary, src/lib.rs for a library).

The recipe.json is the equivalent of the Python requirements.txt file - it is the only input required for cargo chef cook, the command that will build out our dependencies:

cargo chef cook --recipe-path recipe.json

If you want to build in --release mode:

cargo chef cook --release --recipe-path recipe.json

You can leverage it in a Dockerfile:

FROM rust as planner
WORKDIR app
# We only pay the installation cost once, 
# it will be cached from the second build onwards
RUN cargo install cargo-chef 
COPY . .
RUN cargo chef prepare  --recipe-path recipe.json

FROM rust as cacher
WORKDIR app
RUN cargo install cargo-chef
COPY --from=planner /app/recipe.json recipe.json
RUN cargo chef cook --release --recipe-path recipe.json

FROM rust as builder
WORKDIR app
COPY . .
# Copy over the cached dependencies
COPY --from=cacher /app/target target
COPY --from=cacher /usr/local/cargo /usr/local/cargo
RUN cargo build --release --bin app

FROM rust as runtime
WORKDIR app
COPY --from=builder /app/target/release/app /usr/local/bin
ENTRYPOINT ["./usr/local/bin/app"]

We are using four stages: the first computes the recipe file, the second caches our dependencies, the third builds the binary and the fourth is our runtime environment.
As long as your dependencies do not change the recipe.json file will stay the same, therefore the outcome of cargo cargo chef cook --release --recipe-path recipe.json will be cached, massively speeding up your builds (up to 5x measured on some commercial projects).

Limitations

cargo-chef has been tested on a few OpenSource projects and some of commercial projects, but our testing has definitely not exhausted the range of possibilities when it comes to cargo build customisations and we are sure that there are a few rough edges that will have to be smoothed out - please file issues on GitHub.

So far we have found the following limitations and caveats:

• cargo cook and cargo build must be executed from the same working directory. If you examine the *.d files under target/debug/deps for one of your projects using cat you will notice that they contain absolute paths referring to the project target directory. If moved around, cargo will not leverage them as cached dependencies;
• cargo build will build local dependencies (outside of the current project) from scratch, even if they are unchanged, due to the reliance of its fingerprinting logic on timestamps (see this long issue on cargo's repository);

cargo-chef has not yet been tested extensively with projects leveraging build files.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option. Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.