ci.yml

name: ci
on:
  pull_request:
  push:
    branches:
    - master
  schedule:
  - cron: '00 01 * * *'

# The section is needed to drop write-all permissions that are granted on
# `schedule` event. By specifying any permission explicitly all others are set
# to none. By using the principle of least privilege the damage a compromised
# workflow can do (because of an injection or compromised third party tool or
# action) is restricted. Currently the worklow doesn't need any additional
# permission except for pulling the code. Adding labels to issues, commenting
# on pull-requests, etc. may need additional permissions:
#
# Syntax for this section:
# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
#
# Reference for how to assign permissions on a job-by-job basis:
# https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs
#
# Reference for available permissions that we can enable if needed:
# https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
permissions:
  # to fetch code (actions/checkout)
  contents: read

jobs:
  test:
    name: test
    env:
      # For some builds, we use cross to test on 32-bit and big-endian
      # systems.
      CARGO: cargo
      # When CARGO is set to CROSS, TARGET is set to `--target matrix.target`.
      # Note that we only use cross on Linux, so setting a target on a
      # different OS will just use normal cargo.
      TARGET:
      # Bump this as appropriate. We pin to a version to make sure CI
      # continues to work as cross releases in the past have broken things
      # in subtle ways.
      CROSS_VERSION: v0.2.5
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include:
        - build: pinned
          os: ubuntu-latest
          rust: 1.70.0
        - build: stable
          os: ubuntu-latest
          rust: stable
        - build: stable-x86
          os: ubuntu-latest
          rust: stable
          target: i686-unknown-linux-gnu
        - build: stable-aarch64
          os: ubuntu-latest
          rust: stable
          target: aarch64-unknown-linux-gnu
        - build: stable-powerpc64
          os: ubuntu-latest
          rust: stable
          target: powerpc64-unknown-linux-gnu
        - build: stable-s390x
          os: ubuntu-latest
          rust: stable
          target: s390x-unknown-linux-gnu
        - build: beta
          os: ubuntu-latest
          rust: beta
        - build: nightly
          os: ubuntu-latest
          rust: nightly
        - build: macos
          os: macos-latest
          rust: stable
        - build: win-msvc
          os: windows-latest
          rust: stable
        - build: win-gnu
          os: windows-latest
          rust: stable-x86_64-gnu
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
    - name: Install Rust
      uses: dtolnay/rust-toolchain@master
      with:
        toolchain: ${{ matrix.rust }}
    - name: Install and configure Cross
      if: matrix.os == 'ubuntu-latest' && matrix.target != ''
      run: |
        # In the past, new releases of 'cross' have broken CI. So for now, we
        # pin it. We also use their pre-compiled binary releases because cross
        # has over 100 dependencies and takes a bit to compile.
        dir="$RUNNER_TEMP/cross-download"
        mkdir "$dir"
        echo "$dir" >> $GITHUB_PATH
        cd "$dir"
        curl -LO "https://github.com/cross-rs/cross/releases/download/$CROSS_VERSION/cross-x86_64-unknown-linux-musl.tar.gz"
        tar xf cross-x86_64-unknown-linux-musl.tar.gz

        # We used to install 'cross' from master, but it kept failing. So now
        # we build from a known-good version until 'cross' becomes more stable
        # or we find an alternative. Notably, between v0.2.1 and current
        # master (2022-06-14), the number of Cross's dependencies has doubled.
        echo "CARGO=cross" >> $GITHUB_ENV
        echo "TARGET=--target ${{ matrix.target }}" >> $GITHUB_ENV
    - name: Show command used for Cargo
      run: |
        echo "cargo command is: ${{ env.CARGO }}"
        echo "target flag is: ${{ env.TARGET }}"
    - name: Show CPU info for debugging
      if: matrix.os == 'ubuntu-latest'
      run: lscpu
    # See: https://github.com/rust-lang/regex/blob/a2887636930156023172e4b376a6febad4e49120/.github/workflows/ci.yml#L145-L163
    - run: ${{ env.CARGO }} build --verbose $TARGET
    - run: ${{ env.CARGO }} doc --verbose $TARGET
    - run: ${{ env.CARGO }} test --verbose $TARGET

  rustfmt:
    name: rustfmt
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
    - name: Install Rust
      uses: dtolnay/rust-toolchain@master
      with:
        toolchain: stable
        components: rustfmt
    - name: Check formatting
      run: |
        cargo fmt --all -- --check