Building a Rust Project

What This Guide Covers

Language versions and other build-environment specific information are in our reference pages:

The rest of this guide covers configuring Rust projects in Travis CI. If you’re new to Travis CI please read our Getting Started and build configuration guides first.

Choosing a Rust version

By default, we download and install the latest stable Rust release at the start of the build, along with appropriate language tools including cargo, rustc, rustdoc, rust-gdb, rust-lldb, and rustup.

To test against specific Rust releases:

language: rust
  - 1.0.0
  - 1.1.0

Travis CI also supports all three Rust release channels: stable, beta, and nightly.

The Rust team appreciates testing against the beta and nightly channels, even if you are only targeting stable. A full configuration looks like this:

language: rust
  - stable
  - beta
  - nightly
    - rust: nightly
  fast_finish: true

This will runs your tests against all three channels, but any breakage in nightly will not fail the rest of build.

Dependency Management

Travis CI uses Cargo to install your dependencies:

cargo build --verbose

You can cache your dependencies so they are only recompiled if they or the compiler were upgraded:

cache: cargo

Default Build Script

Travis CI uses Cargo to run your build, the default commands are:

cargo test --verbose

You always can always configure different comands if you need to. For example, if your project is a workspace, you should pass --all to the build commands to build and test all of the member crates:

language: rust
  - cargo build --verbose --all
  - cargo test --verbose --all

Environment variables

The Rust version that is specified in the .travis.yml is available during the build in the TRAVIS_RUST_VERSION environment variable.

Build Matrix

For Rust projects, env and rust can be given as arrays to construct a build matrix.