horizon-airdef/.github/workflows/parity.yml

name: parity
# The vanilla harnesses a pull request's changes can affect, on the Mac mini's runner, which holds the maintainer's
# own Minecraft files (Horizon never downloads the game). Called by ci.yml for pull requests from this repository
# and by run-parity.yml when a maintainer labels a fork's pull request run-parity. See docs/release-flow.md.
on:
  workflow_call:
    inputs:
      base:
        description: The pull request's base commit (the harnesses its changes since then can affect)
        type: string
        required: true
      head:
        description: The commit to check out and test
        type: string
        required: true
permissions:
  contents: read
env:
  # Test runs never reach the telemetry server: no live-count ping, no uploads (docs/telemetry.md).
  HORIZON_TELEMETRY_URL: "off"

jobs:
  parity:
    runs-on: [self-hosted, horizon-game]
    timeout-minutes: 120  # a change to core crates reruns ~300 harnesses: ~60-90 min on the Mac mini
    steps:
      - uses: actions/checkout@v4
        with:
          # The commit the event names: a fork's later pushes need another run-parity label.
          ref: ${{ inputs.head }}
          fetch-depth: 0
          persist-credentials: false
          # Keeps .local/ (parity state, probe builds, oracle results) and target/ between runs.
          clean: false
      - uses: dtolnay/rust-toolchain@stable
      - name: Tools from the runner
        run: bash tools/ci/runner-env.sh
      - name: Vanilla data, and resources prepared by this preparer
        env:
          BASE_SHA: ${{ inputs.base }}
        run: |
          # main's script: one written before a fix to it left a real .local/horizon-client without sounds.json on
          # the runner, and every later job there failed `subtitle`. A branch that changes the script runs its own.
          set -euo pipefail
          if git rev-parse --verify -q origin/main >/dev/null \
            && git diff --quiet "$(git merge-base "$BASE_SHA" HEAD)" HEAD -- tools/ci/vanilla-data.sh; then
            git show origin/main:tools/ci/vanilla-data.sh > "$RUNNER_TEMP/vanilla-data.sh"
            bash "$RUNNER_TEMP/vanilla-data.sh"
          else
            bash tools/ci/vanilla-data.sh
          fi
      - name: The prepared output is the one the preparer's OUTPUT_VERSION says
        env:
          BASE_SHA: ${{ inputs.base }}
        run: python3 tools/prepare_output.py check --cache --base "$BASE_SHA"
      - name: The version constants are the pinned jar's
        run: python3 tools/gen_version_consts.py --check
      - name: The harnesses this change can affect
        env:
          PARITY_HOSTS: ''
          BASE_SHA: ${{ inputs.base }}
        run: |
          # main's selection (tools/parity.py --changed --list with main's parity.py and parity_reach.py), so a
          # branch made before a better selection landed gets it too; the head's own runner then runs those
          # harnesses. A branch that changes the selection itself selects with its own code.
          set -euo pipefail
          own() { python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400; }  # world_spawn takes ~1480 s on a busy runner
          fork_point=$(git merge-base "$BASE_SHA" HEAD)
          if ! git rev-parse --verify -q origin/main >/dev/null || ! git diff --quiet "$fork_point" HEAD -- tools/parity.py tools/parity_reach.py; then
            own
            exit
          fi
          had_reach=$(git ls-files tools/parity_reach.py)
          git show origin/main:tools/parity.py > tools/parity.py
          git show origin/main:tools/parity_reach.py > tools/parity_reach.py
          status=0
          python3 tools/parity.py --changed "$BASE_SHA" --list > .local/parity-selection.txt || status=$?
          git checkout -- tools/parity.py
          if [ -n "$had_reach" ]; then git checkout -- tools/parity_reach.py; else rm -f tools/parity_reach.py; fi
          cat .local/parity-selection.txt
          if [ "$status" != 0 ]; then
            echo "main's selection failed: the head's own selection runs"
            own
            exit
          fi
          names=$(sed '$d' .local/parity-selection.txt | grep -E '^[A-Za-z0-9_#]+$' || true)
          # The summary line says how many would run: a count that doesn't match the names read (a format change)
          # must not let the job pass untested.
          expected=$(tail -1 .local/parity-selection.txt | sed -nE 's/^([0-9]+) of [0-9]+ harnesses would run$/\1/p')
          count=$(printf '%s' "$names" | grep -c . || true)
          if [ -z "$expected" ] || [ "$expected" != "$count" ]; then
            echo "main's selection listed $count names, its summary says '${expected:-?}': the head's own selection runs"
            own
            exit
          fi
          if [ "$count" = 0 ]; then
            echo "Nothing to run."
            exit 0
          fi
          # shellcheck disable=SC2086
          python3 tools/parity.py $names --timeout 2400
      - name: Logs of the failed harnesses
        if: failure()
        uses: actions/upload-artifact@v4
        with:
          name: parity-logs
          path: .local/parity-runner/logs/
          if-no-files-found: ignore
          retention-days: 3