daily_fuzz.yaml

name: Daily parser fuzz

on:
  workflow_dispatch:
  schedule:
    - cron: "0 0 * * *"
  pull_request:
    paths:
      - ".github/workflows/daily_fuzz.yaml"

permissions:
  contents: read

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

env:
  CARGO_INCREMENTAL: 0
  CARGO_NET_RETRY: 10
  CARGO_TERM_COLOR: always
  RUSTUP_MAX_RETRIES: 10
  PACKAGE_NAME: ruff
  FORCE_COLOR: 1

jobs:
  fuzz:
    name: Fuzz
    runs-on: ubuntu-latest
    timeout-minutes: 20
    # Don't run the cron job on forks:
    if: ${{ github.repository == 'astral-sh/ruff' || github.event_name != 'schedule' }}
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false
      - uses: astral-sh/setup-uv@v4
      - name: "Install Rust toolchain"
        run: rustup show
      - name: "Install mold"
        uses: rui314/setup-mold@v1
      - uses: Swatinem/rust-cache@v2
      - name: Build ruff
        # A debug build means the script runs slower once it gets started,
        # but this is outweighed by the fact that a release build takes *much* longer to compile in CI
        run: cargo build --locked
      - name: Fuzz
        run: |
          (
            uvx \
            --python=3.12 \
            --from=./python/py-fuzzer \
            fuzz \
            --test-executable=target/debug/ruff \
            --bin=ruff \
            $(shuf -i 0-9999999999999999999 -n 1000)
          )

  create-issue-on-failure:
    name: Create an issue if the daily fuzz surfaced any bugs
    runs-on: ubuntu-latest
    needs: fuzz
    if: ${{ github.repository == 'astral-sh/ruff' && always() && github.event_name == 'schedule' && needs.fuzz.result == 'failure' }}
    permissions:
      issues: write
    steps:
      - uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            await github.rest.issues.create({
              owner: "astral-sh",
              repo: "ruff",
              title: `Daily parser fuzz failed on ${new Date().toDateString()}`,
              body: "Runs listed here: https://github.com/astral-sh/ruff/actions/workflows/daily_fuzz.yml",
              labels: ["bug", "parser", "fuzzer"],
            })