This is a Heroku buildpack for Rust with support for cargo and rustup. Features include:
- Caching of builds between deployments.
- Automatic updates to the latest stable Rust by default.
- Optional pinning of Rust to a specific version.
- Support for
export
so that other buildpacks can access the Rust toolchain. - Support for compiling Rust-based extensions for projects written in other languages.
Here are several example projects:
- rust-buildpack-example-actix uses the popular Actix framework, and runs on stable Rust.
- rust-buildpack-example-rocket uses the innovative Rocket framework, which currently requires nightly Rust.
To deploy an application to Heroku, we recommend installing the Heroku CLI.
If you're creating a new Heroku application, cd
to the directory containing your code, and run:
heroku create --buildpack emk/rust
This will only work if your application has a Cargo.toml
and uses git
. If you want to set a particular name for application, see heroku create --help
first.
To use this as the buildpack for an existing application, run:
heroku buildpacks:set emk/rust
You will also need to create a Procfile
pointing to the release version of your application, and commit it to git
:
web: ./target/release/hello
...where hello
is the name of your binary.
To deploy your application, run:
git push heroku master
This will install the diesel CLI at build time and make it available in your dyno. Migrations will run whenever a new version of your app is released. Add the following line to your RustConfig
RUST_INSTALL_DIESEL=1
and this one to your Procfile
release: ./target/release/diesel migration run
By default, your application will be built using the latest stable Rust. Normally, this is pretty safe: New stable Rust releases have excellent backwards compatibility.
But you may wish to use nightly
Rust or to lock your Rust version to a known-good configuration for more reproducible builds. To specify a specific version of the toolchain, use a rust-toolchain
file in the format rustup uses.
Note: if you previously specified a VERSION
variable in RustConfig
, that will continue to work, and will override a rust-toolchain
file.
If you have a project which combines both Rust and another programming language, you can insert this buildpack before your existing one as follows:
heroku buildpacks:add --index 1 emk/rust
If you have a valid Cargo.toml
in your project, this is all you need to do. The Rust buildpack will run first, and your existing buildpack will run second.
But if you only need Rust to build a particular Ruby gem, and you have no top-level Cargo.toml
file, you'll need to let the buildpack know to skip the build stage. You can do this by adding the following line to RustConfig
:
RUST_SKIP_BUILD=1
If you want to change the cargo build command, you can set the RUST_CARGO_BUILD_FLAGS
variable inside the RustConfig
file.
RUST_CARGO_BUILD_FLAGS="--release -p some_package --bin some_exe --bin some_bin_2"
The default value of RUST_CARGO_BUILD_FLAGS
is --release
.
If the variable is not set in RustConfig
, the default value will be used to build the project.
The emk/rust
buildpack from the Heroku Registry contains the latest stable version of the buildpack. If you'd like to use the latest buildpack code from this Github repository, you can set your buildpack to the Github URL:
heroku buildpacks:set https://github.com/emk/heroku-buildpack-rust
If you need to tweak this buildpack, the following information may help.
To test changes to the buildpack using the included docker-compose-test.yml
, run:
./test_buildpack
Then make sure there are no Rust-related *.so files getting linked:
ldd heroku-rust-cargo-hello/target/release/hello
This uses the Docker image heroku/cedar
, which allows us to test in an official Cedar-like environment.
We also run this test automatically on Travis CI.