name: lane-shas

# Verify that every ADR-0092..0104 lane produces its pinned SHA-256
# report. A failing job means a lane's deterministic output changed
# without an explicit ADR-tracked pin update via:
#
#   python scripts/verify_lane_shas.py --update
#
# Single source of truth for the pinned values is scripts/verify_lane_shas.py.
#
# PR path policy (job-level, not workflow-level):
#   Pin bytes can move from Python, packs, eval fixtures/corpora, teaching
#   corpora, dependency pins, CLAIMS.md, or this workflow. When none of those
#   paths change on a PR, we skip the multi-minute runners and exit success so
#   a required check never sits "Waiting" forever (workflow-level `paths:`
#   would omit the job entirely and hang required status checks).
#   Main pushes always verify.

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

permissions:
  contents: read

concurrency:
  group: lane-shas-${{ github.ref }}
  cancel-in-progress: true

jobs:
  verify:
    name: verify pinned lane SHAs
    runs-on: ubuntu-latest
    timeout-minutes: 20

    steps:
      - name: checkout
        uses: actions/checkout@v4
        with:
          # Need base..head for PR path detection.
          fetch-depth: 0

      - name: detect pin-relevant paths
        id: paths
        shell: bash
        run: |
          set -euo pipefail
          # Always verify on main pushes.
          if [ "${{ github.event_name }}" = "push" ]; then
            echo "run=true" >> "$GITHUB_OUTPUT"
            echo "Pin-relevant path check: always run on push"
            exit 0
          fi

          BASE="${{ github.event.pull_request.base.sha }}"
          HEAD="${{ github.event.pull_request.head.sha }}"
          # Paths that can change pin bytes or CLAIMS generation inputs.
          # Keep in sync with docs/testing-lanes.md § CI policy.
          PATTERN='(\.py$|^packs/|^evals/|^teaching/|^CLAIMS\.md$|^pyproject\.toml$|^uv\.lock$|^\.github/workflows/lane-shas\.yml$)'
          if git diff --name-only "$BASE" "$HEAD" | grep -E "$PATTERN" >/dev/null; then
            echo "run=true" >> "$GITHUB_OUTPUT"
            echo "Pin-relevant paths changed; running lane SHA verification"
            git diff --name-only "$BASE" "$HEAD" | grep -E "$PATTERN" || true
          else
            echo "run=false" >> "$GITHUB_OUTPUT"
            echo "No pin-relevant paths changed; skipping lane SHA verification (job still green)"
          fi

      # setup-uv (not actions/setup-python) provisions Python on the aarch64
      # self-hosted runner; actions/setup-python has no arm64 build for the
      # pinned 3.12.13. Matches smoke.yml / full-pytest.yml.
      - name: set up uv
        if: steps.paths.outputs.run == 'true'
        uses: astral-sh/setup-uv@v5
        with:
          python-version: '3.12.13'
          enable-cache: true

      - name: install dependencies
        if: steps.paths.outputs.run == 'true'
        run: |
          uv pip install -e . pyyaml pytest

      - name: verify lane SHAs
        if: steps.paths.outputs.run == 'true'
        env:
          PYTHONPATH: ${{ github.workspace }}
          # public_demo wall-clock is soft by default (see evals/public_demo/runner.py).
          # Do not set CORE_SHOWCASE_HARD_BUDGET here — cold Act runners exceed 60s.
          # Content cases (claims, determinism, pure composition) remain hard gates.
        run: |
          uv run python scripts/verify_lane_shas.py

      - name: verify CLAIMS.md is current
        if: steps.paths.outputs.run == 'true'
        env:
          PYTHONPATH: ${{ github.workspace }}
        run: |
          uv run python scripts/generate_claims.py --check

      - name: emit machine-readable report (on failure)
        if: failure() && steps.paths.outputs.run == 'true'
        env:
          PYTHONPATH: ${{ github.workspace }}
        run: |
          uv run python scripts/verify_lane_shas.py --json || true

      - name: skip notice
        if: steps.paths.outputs.run != 'true'
        run: |
          echo "::notice title=lane-shas skipped::No pin-relevant paths in this PR; verification skipped (success)."