toolchain-version-check.yaml

---
name: Toolchain Version Check
"on":
  schedule:
    - cron: "0 5 * * 5" # 5am UTC Fridays. Rust toolchain versions merge Thursday afternoons.
  workflow_dispatch:

jobs:
  check-toolchain-version:
    name: Check toolchain version
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4.2.2

      - name: Install Ruby toolchain
        uses: ruby/setup-ruby@4a9ddd6f338a97768b8006bf671dfbad383215f4 # v1.207.0
        with:
          ruby-version: ".ruby-version"
          bundler-cache: true

      - name: Read existing rustc version
        id: rust_version
        run: |
          echo "version=$(bundle exec rake toolchain:version)" >> "$GITHUB_OUTPUT"

      - name: Check the latest rustc version
        id: latest_rust_release
        uses: octokit/request-action@dad4362715b7fb2ddedf9772c8670824af564f0d # v2.4.0
        with:
          route: GET /repos/{owner}/{repo}/releases/latest
          owner: rust-lang
          repo: rust
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract rust version info
        id: version_info
        env:
          CURRENT: ${{ steps.rust_version.outputs.version }}
          NEXT: ${{ fromJson(steps.latest_rust_release.outputs.data).tag_name }}
        run: |
          echo "current=$CURRENT" >> "$GITHUB_OUTPUT"
          echo "next=$NEXT" >> "$GITHUB_OUTPUT"
          if [[ "$CURRENT" == "$NEXT" ]]; then
            echo "matches=true" >> "$GITHUB_OUTPUT"
          else
            echo "matches=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Update the toolchain version and run sync
        if: ${{ steps.version_info.outputs.matches != 'true' }}
        env:
          CURRENT: ${{ steps.version_info.outputs.current }}
          NEXT: ${{ steps.version_info.outputs.next }}
        run: |
          # Matches `RUST_VERSION = '$CURRENT'` and replaces with `RUST_VERSION = '$NEXT'`
          sed -i "s/^RUST_VERSION = '$CURRENT'$/RUST_VERSION = '$NEXT'/g" Rakefile
          bundle exec rake toolchain:sync

      - name: Create Pull Request
        uses: peter-evans/create-pull-request@67ccf781d68cd99b580ae25a5c18a1cc84ffff1f # v7.0.6
        if: ${{ steps.version_info.outputs.matches != 'true' }}
        with:
          title: Update Rust toolchain from ${{ steps.version_info.outputs.current }} to ${{ steps.version_info.outputs.next }}
          body: |
            > [!WARNING]
            > This PR is automatically created via a Github Action. Ensure all changes are valid before merging.

            Update the toolchain and sync to the latest available in rust-lang/rust.

            Current toolchain version: ${{ steps.version_info.outputs.current }}
            Latest toolchain version: ${{ steps.version_info.outputs.next }}

            [Changelog](https://github.com/rust-lang/rust/blob/master/RELEASES.md)
            [Commits](https://github.com/rust-lang/rust/compare/${{ steps.version_info.outputs.current}}...${{ steps.version_info.outputs.next }})
          commit-message: Sync the toolchain to the latest Rust upstream
          add-paths: |
            Rakefile
            **/Dockerfile
          base: trunk
          branch: actions/update-toolchain-version
          labels: |
            A-deps
          assignees: |
            @artichoke/contributors