rs-cargo/README.md

# Rust `cargo` Action

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This GitHub Action runs specified [`cargo`](https://github.com/rust-lang/cargo)
command on a Rust language project.

## Example workflow

```yaml
on: [push]

name: CI

jobs:
  build_and_test:
    name: Rust project
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@master
      - uses: actions-rs/cargo@v1
        with:
          command: build
          arguments: --release --all-features
```

## Inputs

* `command` (*required*) - Cargo command to run (ex. `check` or `build`)
* `toolchain` - Rust toolchain to use (without the `+` sign, ex. `nightly`);\
    Override or system toolchain will be used if omitted.
* `args` - Arguments for the cargo command
* `use-cross` - Use [`cross`](https://github.com/rust-embedded/cross) instead of `cargo` (default: `false`)

## Virtual environments

Note that `cargo` is not available by default for all [virtual environments](https://help.github.com/en/articles/software-in-virtual-environments-for-github-actions);
for example, as for 2019-09-15, `macOS` env is missing it.

You can use [`actions-rs/toolchain`](https://github.com/actions-rs/toolchain)
to install the Rust toolchain with `cargo` included.

## Cross

In order to make cross-compilation an easy process,
this Action can install [cross](https://github.com/rust-embedded/cross)
tool on demand if `use-cross` input is enabled; `cross` executable will be invoked
then instead of `cargo` automatically.

All consequent calls of this Action in the same job will use the same `cross` installed.

```yaml
on: [push]

name: ARMv7 build

jobs:
  linux_arm7:
    name: Linux ARMv7
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@master
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
          target: armv7-unknown-linux-gnueabihf
          override: true
      - uses: actions-rs/cargo@v1
        with:
          use-cross: true
          command: build
          args: --target armv7-unknown-linux-gnueabihf
```