versions.yml

name: Version Check

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

jobs:
  check-rust-version:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Stable Rust Toolchain
        uses: dtolnay/rust-toolchain@stable

      # Capture the version installed by the action (immediately after install)
      # Ignore the point (patch) release number.
      - name: Capture installed rustc version
        id: installed_version
        run: |
          INSTALLED=$(rustc --version | awk '{print $2}' | awk -F. '{print $1"."$2}')
          echo "installed_version=$INSTALLED" >> $GITHUB_OUTPUT

      - name: Extract rust-toolchain.toml version
        id: toolchain_version
        run: |
          VERSION=$(grep -E '^channel\s*=' rust-toolchain.toml | cut -d '"' -f2)
          echo "toolchain_version=$VERSION" >> $GITHUB_OUTPUT

      - name: Compare Rust versions
        run: |
          echo "Installed rustc version:   ${{ steps.installed_version.outputs.installed_version }}"
          echo "rust-toolchain.toml version: ${{ steps.toolchain_version.outputs.toolchain_version }}"

          if [[ "${{ steps.toolchain_version.outputs.toolchain_version }}" != "${{ steps.installed_version.outputs.installed_version }}" ]]; then
            echo "Mismatch: rust-toolchain.toml and installed rustc version differ"
            exit 1
          fi
          echo "All Rust versions match."