name: rustup toolchain install
author: David Tolnay
description: Install the Rust toolchain
branding:
  icon: activity
  color: purple

inputs:
  toolchain:
    description: Rust toolchain specification -- see https://rust-lang.github.io/rustup/concepts/toolchains.html#toolchain-specification
    required: false
  targets:
    description: Comma-separated list of target triples to install for this toolchain
    required: false
  target:
    description: Alias for `targets`
    required: false
  components:
    description: Comma-separated list of components to be additionally installed
    required: false

outputs:
  cachekey:
    description: A short hash of the rustc version, appropriate for use as a cache key. "20220627a831"
    value: ${{steps.rustc-version.outputs.cachekey}}
  name:
    description: Rustup's name for the selected version of the toolchain. "1.62.0"  # suitable for use with `cargo +${{steps.toolchain.outputs.name}}`
    value: ${{steps.parse.outputs.toolchain}}

runs:
  using: composite
  steps:
    - id: extract-toml-values
      run: |
        # once https://github.com/mikefarah/yq/pull/1439 is merged, the yq already on the system will have toml support
        pip3 install yq
        TOML_FILE=$(ls rust-toolchain.toml || ls rust-toolchain)
        if [ -z "$TOML_FILE" ]; then
          echo "rust-toolchain{.toml} not found, expecting explicit inputs"
          exit 0
        fi
        TOML_TOOLCHAIN=$(tomlq -r '.toolchain.channel | select(. != null)' $TOML_FILE)
        if [ -n "$TOML_TOOLCHAIN" ]; then
          echo "toml-toolchain=$TOML_TOOLCHAIN" >> $GITHUB_OUTPUT
        fi
        TOML_TARGETS=$(tomlq -r '.toolchain.targets | select(. != null) | @csv' $TOML_FILE)
        if [ -n "$TOML_TARGETS" ]; then
          echo "toml-targets=$TOML_TARGETS" >> $GITHUB_OUTPUT
        fi
        TOML_COMPONENTS=$(tomlq -r '.toolchain.components | select(. != null) | @csv' $TOML_FILE)
        if [ -n "$TOML_COMPONENTS" ]; then
          echo "toml-components=$TOML_COMPONENTS" >> $GITHUB_OUTPUT
        fi
      shell: bash
    - id: parse
      run: |
        : parse toolchain version
        if [[ $toolchain =~ ^stable' '[0-9]+' '(year|month|week|day)s?' 'ago$ ]]; then
          if [[ ${{runner.os}} == macOS ]]; then
            echo "toolchain=1.$((($(date -v-$(sed 's/stable \([0-9]*\) \(.\).*/\1\2/' <<< $toolchain) +%s)/60/60/24-16569)/7/6))" >> $GITHUB_OUTPUT
          else
            echo "toolchain=1.$((($(date --date "${toolchain#stable }" +%s)/60/60/24-16569)/7/6))" >> $GITHUB_OUTPUT
          fi
        elif [[ $toolchain =~ ^stable' 'minus' '[0-9]+' 'releases?$ ]]; then
          echo "toolchain=1.$((($(date +%s)/60/60/24-16569)/7/6-${toolchain//[^0-9]/}))" >> $GITHUB_OUTPUT
        else
          echo "toolchain=$toolchain" >> $GITHUB_OUTPUT
        fi
      env:
        toolchain: ${{inputs.toolchain || steps.extract-toml-values.outputs.toml-toolchain || 'stable'}}
      shell: bash

    - id: flags
      run: |
        : construct rustup command line
        echo "targets=$(for t in ${targets//,/ }; do echo -n ' --target' $t; done)" >> $GITHUB_OUTPUT
        echo "components=$(for c in ${components//,/ }; do echo -n ' --component' $c; done)" >> $GITHUB_OUTPUT
        echo "downgrade=${{inputs.toolchain == 'nightly' && inputs.components && ' --allow-downgrade' || ''}}" >> $GITHUB_OUTPUT
      env:
        targets: ${{inputs.targets || inputs.target || steps.extract-toml-values.outputs.toml-targets || ''}}
        components: ${{inputs.components || steps.extract-toml-values.outputs.toml-components }}
      shell: bash

    - run: |
        : install rustup if needed
        if ! command -v rustup &> /dev/null ; then
          curl --proto '=https' --tlsv1.2 --retry 10 --retry-connrefused -fsSL "https://sh.rustup.rs" | sh -s -- --default-toolchain none -y
          echo "${CARGO_HOME:-$HOME/.cargo}/bin" >> $GITHUB_PATH
        fi
      if: runner.os != 'Windows'
      shell: bash

    - name: rustup toolchain install ${{steps.parse.outputs.toolchain}}
      run: rustup toolchain install ${{steps.parse.outputs.toolchain}}${{steps.flags.outputs.targets}}${{steps.flags.outputs.components}} --profile minimal${{steps.flags.outputs.downgrade}} --no-self-update
      shell: bash

    - run: rustup default ${{steps.parse.outputs.toolchain}}
      shell: bash

    - id: rustc-version
      run: |
        : create cachekey
        DATE=$(rustc +${{steps.parse.outputs.toolchain}} --version --verbose | sed -ne 's/^commit-date: \(20[0-9][0-9]\)-\([01][0-9]\)-\([0-3][0-9]\)$/\1\2\3/p')
        HASH=$(rustc +${{steps.parse.outputs.toolchain}} --version --verbose | sed -ne 's/^commit-hash: //p')
        echo "cachekey=$(echo $DATE$HASH | head -c12)" >> $GITHUB_OUTPUT
      shell: bash

    - run: |
        : disable incremental compilation
        echo CARGO_INCREMENTAL=0 >> $GITHUB_ENV
      shell: bash

    - run: |
        : enable colors in Cargo output
        echo CARGO_TERM_COLOR=always >> $GITHUB_ENV
      shell: bash

    - run: |
        : enable Cargo sparse registry  # ignored by stable cargo
        echo CARGO_UNSTABLE_SPARSE_REGISTRY=true >> $GITHUB_ENV
      shell: bash

    - run: rustc +${{steps.parse.outputs.toolchain}} --version --verbose
      shell: bash