Install Rust Toolchain

This GitHub Action installs a Rust toolchain using rustup. It is designed for one-line concise usage and good defaults.

Example workflow

name: test suite
on: [push, pull_request]

jobs:
  test:
    name: cargo test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - uses: dtolnay/rust-toolchain@stable
      - run: cargo test --all-features

The selection of Rust toolchain is made based on the particular @rev of this Action being requested. For example "dtolnay/rust-toolchain@nightly" pulls in the nightly Rust toolchain, while "dtolnay/rust-toolchain@1.89.0" pulls in 1.89.0.

Inputs

All inputs are optional.

Name	Description
toolchain	Rustup toolchain specifier e.g. stable, nightly, 1.89.0, nightly-2025-01-01. Important: the default is to match the @rev as described above. When passing an explicit toolchain as an input instead of @rev, you'll want to use "dtolnay/rust-toolchain@master" as the revision of the action.
targets	Comma-separated string of additional targets to install e.g. wasm32-unknown-unknown
components	Comma-separated string of additional components to install e.g. clippy, rustfmt

Outputs

Name	Description
cachekey	A short hash of the installed rustc version, appropriate for use as a cache key. "20250627a831"
name	Rustup's name for the selected version of the toolchain, like "1.62.0". Suitable for use with cargo +${{steps.toolchain.outputs.name}}.

Toolchain expressions

The following forms are available for projects that use a sliding window of compiler support.

     # Installs the most recent stable toolchain as of the specified time
     # offset, which may be written in years, months, weeks, or days.
  - uses: dtolnay/rust-toolchain@master
    with:
      toolchain: stable 18 months ago

     # Installs the stable toolchain which preceded the most recent one by
     # the specified number of minor versions.
  - uses: dtolnay/rust-toolchain@master
    with:
      toolchain: stable minus 8 releases

Choice of full-length commit SHA

In a workflow that pins the action using a full-length commit SHA (as opposed to something like @nightly or @1.89.0) it is required that you pick a SHA that is within the history of the master branch. Any commit that is not within the history of master will eventually get garbage-collected and your workflows will fail.

License

The scripts and documentation in this project are released under the MIT License.