_lint.yml

# Reusable: lint only (cppcheck + clang-format).
# Security-static and CodeQL gate are separate — see _security.yml.
name: Lint & Security

on:
  workflow_call: {}

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 15
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Install build deps
        run: sudo apt-get update && sudo apt-get install -y zlib1g-dev cmake

      - name: Install LLVM 20
        run: |
          wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc
          echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-20 main" | sudo tee /etc/apt/sources.list.d/llvm-20.list
          sudo apt-get update
          sudo apt-get install -y clang-format-20

      - uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
        id: cppcheck-cache
        with:
          path: /opt/cppcheck
          key: cppcheck-2.20.0-ubuntu-amd64

      - name: Build cppcheck 2.20.0
        if: steps.cppcheck-cache.outputs.cache-hit != 'true'
        run: |
          git clone --depth 1 --branch 2.20.0 https://github.com/danmar/cppcheck.git /tmp/cppcheck
          cmake -S /tmp/cppcheck -B /tmp/cppcheck/build -DCMAKE_BUILD_TYPE=Release -DHAVE_RULES=OFF -DCMAKE_INSTALL_PREFIX=/opt/cppcheck
          cmake --build /tmp/cppcheck/build -j$(nproc)
          cmake --install /tmp/cppcheck/build

      - name: Add cppcheck to PATH
        run: echo "/opt/cppcheck/bin" >> "$GITHUB_PATH"

      - name: Lint (cppcheck + clang-format, no clang-tidy — enforced locally)
        run: scripts/lint.sh --ci CLANG_FORMAT=clang-format-20