RustNotMC/.github/workflows/nightly.yml

name: nightly audit
# Every vanilla harness, from scratch, on main, at 03:00 Paris time on the Mac mini's runner (it holds the
# maintainer's own Minecraft files). The resources are prepared again first when the preparer or its exporters
# changed (tools/ci/vanilla-data.sh). A harness that passed in the previous audit and fails now gets an issue
# labelled parity-regression (one per harness); its issue closes when it passes again
# (tools/ci/parity_issues.py). The bugs session picks those up. See docs/release-flow.md.
#   gh workflow run "nightly audit"                    # now
#   gh workflow run "nightly audit" -f dry_run=true    # the audit, without touching issues
on:
  schedule:
    # GitHub's schedules are in UTC: both, and the first step keeps the one that is 03:07 in Paris today.
    - cron: '7 1 * * *'
    - cron: '7 2 * * *'
  workflow_dispatch:
    inputs:
      dry_run:
        description: Run the audit, but only print what it would do with issues
        type: boolean
        default: false
permissions:
  contents: read
  issues: write
concurrency:
  group: nightly-audit
  cancel-in-progress: false
env:
  # Test runs never reach the telemetry server: no live-count ping, no uploads (docs/telemetry.md).
  HORIZON_TELEMETRY_URL: "off"

jobs:
  audit:
    # The Mac mini's runners only: the audit compares with the previous one, so it stays on one platform.
    runs-on: [self-hosted, horizon-game, macOS]
    timeout-minutes: 240  # every harness (~80 min) plus lan_integration (~40 min an attempt under load, retried)
    steps:
      - name: 03:07 in Paris
        id: when
        env:
          SCHEDULE: ${{ github.event.schedule }}
        run: |
          # Which cron is 03:07 in Paris, from Paris's offset today: GitHub can start a schedule hours late, so the
          # clock at start time can't tell (on 2026-10-26 both started after 04:00 Paris and both skipped).
          offset=$(TZ=Europe/Paris date +%z)
          ours=$([ "$offset" = +0200 ] && echo '7 1 * * *' || echo '7 2 * * *')
          if [[ "${{ github.event_name }}" == schedule && "$SCHEDULE" != "$ours" ]]; then
            echo "Paris is at UTC${offset} today: the '$ours' schedule runs the audit."
            echo "run=false" >> "$GITHUB_OUTPUT"
          else
            echo "run=true" >> "$GITHUB_OUTPUT"
          fi
      - uses: actions/checkout@v4
        if: steps.when.outputs.run == 'true'
        with:
          fetch-depth: 0
          persist-credentials: false
          # Keeps .local/ (parity state, probe builds, the previous audit) and target/.
          clean: false
      - uses: dtolnay/rust-toolchain@stable
        if: steps.when.outputs.run == 'true'
      - name: Tools from the runner
        if: steps.when.outputs.run == 'true'
        run: bash tools/ci/runner-env.sh
      - name: Vanilla data, prepared again if the preparer changed
        if: steps.when.outputs.run == 'true'
        run: bash tools/ci/vanilla-data.sh
      - name: Every harness
        id: audit
        if: steps.when.outputs.run == 'true'
        env:
          PARITY_HOSTS: ''
        run: |
          echo "since=$(date +%Y-%m-%dT%H:%M:%S)" >> "$GITHUB_OUTPUT"
          set +e
          # lan_integration (the whole lan_e2e suite) takes ~2,400 s under load, past the usual 1,800.
          python3 tools/parity.py --all --timeout 3000 2>&1 | tee "$RUNNER_TEMP/audit.log"
          echo "exit=${PIPESTATUS[0]}" >> "$GITHUB_OUTPUT"
          { echo '```'; tail -40 "$RUNNER_TEMP/audit.log"; echo '```'; } >> "$GITHUB_STEP_SUMMARY"
      - name: Issues for the harnesses that regressed
        if: steps.when.outputs.run == 'true' && always() && steps.audit.outputs.since
        env:
          GH_TOKEN: ${{ github.token }}
        run: python3 tools/ci/parity_issues.py --since "${{ steps.audit.outputs.since }}" ${{ inputs.dry_run && '--dry-run' || '' }} | tee -a "$GITHUB_STEP_SUMMARY"
      - name: Logs of the failed harnesses
        if: steps.when.outputs.run == 'true' && steps.audit.outputs.exit != '0'
        uses: actions/upload-artifact@v4
        with:
          name: nightly-parity-logs
          path: .local/parity-runner/logs/
          if-no-files-found: ignore
          retention-days: 7