name: Fuzzing

# spell-checker:ignore fuzzer

on:
  pull_request:
  push:
    branches:
      - main

permissions:
  contents: read # to fetch code (actions/checkout)

# End the current execution if there is a new changeset in the PR.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

jobs:
  fuzz-build:
    name: Build the fuzzers
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - uses: dtolnay/rust-toolchain@nightly
    - name: Install `cargo-fuzz`
      run: cargo install cargo-fuzz
    - uses: Swatinem/rust-cache@v2
      with:
        shared-key: "cargo-fuzz-cache-key"
        cache-directories: "fuzz/target"
    - name: Run `cargo-fuzz build`
      run: cargo +nightly fuzz build

  fuzz-run:
    needs: fuzz-build
    name: Run the fuzzers
    runs-on: ubuntu-latest
    timeout-minutes: 5
    env:
      RUN_FOR: 60
    strategy:
      matrix:
        test-target:
          - { name: fuzz_test, should_pass: true }
          # https://github.com/uutils/coreutils/issues/5311
          - { name: fuzz_date, should_pass: false }
          - { name: fuzz_expr, should_pass: true }
          - { name: fuzz_printf, should_pass: false }
          - { name: fuzz_echo, should_pass: true }
          - { name: fuzz_seq, should_pass: false }
          - { name: fuzz_sort, should_pass: false }
          - { name: fuzz_wc, should_pass: false }
          - { name: fuzz_cut, should_pass: false }
          - { name: fuzz_split, should_pass: false }
          - { name: fuzz_tr, should_pass: false }
          - { name: fuzz_env, should_pass: false }
          - { name: fuzz_parse_glob, should_pass: true }
          - { name: fuzz_parse_size, should_pass: true }
          - { name: fuzz_parse_time, should_pass: true }
          - { name: fuzz_seq_parse_number, should_pass: true }

    steps:
    - uses: actions/checkout@v4
    - uses: dtolnay/rust-toolchain@nightly
    - name: Install `cargo-fuzz`
      run: cargo install cargo-fuzz
    - uses: Swatinem/rust-cache@v2
      with:
        shared-key: "cargo-fuzz-cache-key"
        cache-directories: "fuzz/target"
    - name: Restore Cached Corpus
      uses: actions/cache/restore@v4
      with:
        key: corpus-cache-${{ matrix.test-target.name }}
        path: |
          fuzz/corpus/${{ matrix.test-target.name }}
    - name: Run ${{ matrix.test-target.name }} for XX seconds
      shell: bash
      continue-on-error: ${{ !matrix.test-target.name.should_pass }}
      run: |
        cargo +nightly fuzz run ${{ matrix.test-target.name }} -- -max_total_time=${{ env.RUN_FOR }} -detect_leaks=0
    - name: Save Corpus Cache
      uses: actions/cache/save@v4
      with:
        key: corpus-cache-${{ matrix.test-target.name }}
        path: |
          fuzz/corpus/${{ matrix.test-target.name }}