cargo-wasix

A cargo subcommand that wraps regular cargo commands for compiling Rust code to wasix, a superset of Webassembly wasi with additional functionality.

See wasix.org for more.

Installation

Installation requires ‣ Rust installed via rustup

Information

This subcommand is available on crates.io

Available platforms:

• x86_64-unknown-linux-gnu
• x86_64-apple-darwin
• aarch64-apple-darwin
• x86_64-pc-windows-msvc

[!WARNING] The installation methods below will not immediately install the wasix Rust toolchain. Instead, the toolchain will automatically be downloaded on demand when you run commands like cargo wasix {check,build,...}.

You can install this Cargo subcommand via:

Cargo Install

$ cargo install cargo-wasix

Cargo Binstall

cargo binstall provides a low-complexity mechanism for installing rust binaries as an alternative to building from source (via cargo install) or manually downloading packages.

Uses pre-built binaries.

$ cargo binstall cargo-wasix

Install from install script

Uses pre-built binaries.

For Linux and macOS

$ curl --proto '=https' --tlsv1.2 -LsSf https://github.com/wasix-org/cargo-wasix/releases/latest/download/cargo-wasix-installer.sh | sh

For Windows

irm https://github.com/wasix-org/cargo-wasix/releases/latest/download/cargo-wasix-installer.ps1 | iex

Verify Installation

$ cargo wasix --version

Usage

The cargo wasix subcommand is a thin wrapper around cargo subcommands, providing optimized defaults for the wasm32-wasmer-wasi target. Using cargo wasix looks very similar to using cargo:

• cargo wasix build — build your code in debug mode for the wasix target.

• cargo wasix build --release — build the optimized version of your *.wasm.

• cargo wasix run — execute a binary.

• cargo wasix test — run your tests in wasm32-wasmer-wasi.

• cargo wasix bench — run your benchmarks in wasm32-wasmer-wasi.

In general, if you'd otherwise execute cargo foo --flag you can likely execute cargo wasix foo --flag and everything will "just work" for the wasm32-wasmer-wasi target.

To give it a spin yourself, try out the hello-world versions of programs!

$ cargo new wasix-hello-world
     Created binary (application) `wasix-hello-world` package
$ cd wasix-hello-world
$ cargo wasix run
   Compiling wasix-hello-world v0.1.0 (/code/wasix-hello-world)
    Finished dev [unoptimized + debuginfo] target(s) in 0.15s
     Running `cargo-wasix target/wasm32-wasmer-wasi/debug/wasix-hello-world.wasm`
     Running `target/wasm32-wasmer-wasi/debug/wasix-hello-world.wasm`
Hello, world!

Or a library with some tests:

$ cargo new wasix-hello-world --lib
     Created library `wasix-hello-world` package
$ cd wasix-hello-world
$ cargo wasix test
   Compiling wasix-hello-world v0.1.0 (/code/wasix-hello-world)
    Finished dev [unoptimized + debuginfo] target(s) in 0.19s
     Running target/wasm32-wasmer-wasi/debug/deps/wasix_hello_world-9aa88657c21196a1.wasm
     Running `/code/wasix-hello-world/target/wasm32-wasmer-wasi/debug/deps/wasix_hello_world-9aa88657c21196a1.wasm`

running 1 test
test tests::it_works ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

Update/re-download the toolchain

If your toolchain stops working, or you want to update to the latest version, you can run the following command to re-download the lastest release:

cargo wasix download-toolchain

License

This project is license under the Apache 2.0 license with the LLVM exception. See LICENSE for more details.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be licensed as above, without any additional terms or conditions.