name: CodeQL SAST

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

permissions:
  contents: read

# One analysis per pull request and one per pushed branch. A newer push to main
# cancels the analysis of an older main commit; only the newest commit's
# results matter for main, and a merge-heavy day otherwise queues one 40-100
# minute analysis per merge ahead of every pull request run.
concurrency:
  group: codeql-${{ github.event_name }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  analyze:
    runs-on: ubuntu-latest
    # CodeQL needs security-events: write to upload results; scoped to this job so
    # the workflow's top-level token stays read-only (Scorecard TokenPermissions).
    permissions:
      security-events: write
      actions: read
      contents: read
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

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

      - name: Initialize CodeQL
        uses: github/codeql-action/init@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
        with:
          languages: c-cpp
          build-mode: manual

      - name: Build for CodeQL analysis
        run: scripts/build.sh

      - name: Perform CodeQL Analysis
        uses: github/codeql-action/analyze@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
        with:
          category: "/language:c-cpp"