Rewrite Dockerfile to share layers with test-runner#131
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senekor
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The main goal of this is to bring the Dockerfiles of the test-runner and analyzer in sync, so they can share the big layers containing the Rust toolchain and local cargo registry. Some incidental changes / improvements that were made: * Use an official base image with a nightly Rust toolchain, but pinned to a specific hash. This avoids our cache being invalidated every day, without us needing to copy-paste the upstream build script. The requirement to use a nightly toolchain comes from the test runner. * Make local-registry/Cargo.toml more readable for users by moving irrelevant stuff to the bottom. Exercises contain a link to this file, so that students can check themselves which crates are available.
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IsaacG
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May 5, 2026
Co-authored-by: Isaac Good <IsaacG@users.noreply.github.com>
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The main goal of this is to bring the Dockerfiles of the test-runner and analyzer in sync, so they can share the big layers containing the Rust toolchain and local cargo registry.
Some incidental changes / improvements that were made:
Use an official base image with a nightly Rust toolchain, but pinned to a specific hash. This avoids our cache being invalidated every day, without us needing to copy-paste the upstream build script. The requirement to use a nightly toolchain comes from the test runner.
Make local-registry/Cargo.toml more readable for users by moving irrelevant stuff to the bottom. Exercises contain a link to this file, so that students can check themselves which crates are available.
The forum post discussing this:
https://forum.exercism.org/t/requesting-rust-docker-base-repository/48577