.github/actions/bootstrap/action.yaml

name: Bootstrap
description: Bootstrap
inputs:
  platform:
    description: "Platform name"
    required: false
    default: none
  bootstrap-log-name:
    description: "Bootstrap log name"
    required: false
    default: bootstrap-logs-${{ github.job }}
outputs:
  cache-hit:
    description: "Bootstrap environment was restored from cache"
    value: ${{ fromJSON(steps.restore.outputs.outputs).cache-hit }} # dynamic action returns all outputs in `outputs`

runs:
  using: "composite"
  steps:
    - name: Determine bootstrap cache configuration
      id: prepare
      shell: bash
      run: |
        # Determine bootstrap cache configuration
        # In addition to the various setup files, the work directory matters as well,
        # because the bootstrapped Pigweed environment contains absolute paths.
        echo "Calculating bootstrap cache key for '$PWD'"
        FILES_HASH="${{ hashFiles('scripts/setup/*', 'third_party/pigweed/**') }}"
        FINAL_HASH="$(echo "$PWD:$FILES_HASH" | shasum -a 256 | cut -d' ' -f1)"
        echo key="${RUNNER_OS}-${RUNNER_ARCH}-${{ inputs.platform }}-${FINAL_HASH}" | tee -a "$GITHUB_OUTPUT"

        # Split caches across backends
        case "$RUNNER_OS" in
          macOS) echo backend=actions;;
          *)     echo backend=buildjet;;
        esac | tee -a "$GITHUB_OUTPUT"

    - name: Bootstrap from cache
      id: restore
      uses: ./.github/actions/dynamic
      continue-on-error: true
      with:
        action: ${{ steps.prepare.outputs.backend }}/cache/restore@v4
        with: |
          key: ${{ steps.prepare.outputs.key }}
          path: |
            .environment
            build_overrides/pigweed_environment.gni

    - name: Run bootstrap
      if: ${{ fromJSON(steps.restore.outputs.outputs).cache-hit != 'true' }}
      env:
        PW_NO_CIPD_CACHE_DIR: 1
        PW_ENVSETUP_NO_BANNER: 1
      shell: bash
      run: source scripts/bootstrap.sh -p all,${{ inputs.platform }}

    - name: Save bootstrap cache
      uses: ./.github/actions/dynamic
      if: ${{ fromJSON(steps.restore.outputs.outputs).cache-hit != 'true' }}
      continue-on-error: true
      with:
        action: ${{ steps.prepare.outputs.backend }}/cache/save@v4
        with: |
          key: ${{ steps.prepare.outputs.key }}
          path: |
            .environment
            build_overrides/pigweed_environment.gni

    - name: Upload bootstrap logs
      uses: actions/upload-artifact@v4
      if: ${{ always() && !env.ACT && fromJSON(steps.restore.outputs.outputs).cache-hit != 'true' }}
      with:
        name: ${{ inputs.bootstrap-log-name }}
        path: |
            .environment/gn_out/.ninja_log
            .environment/pigweed-venv/*.log