name: Update codegen

on:
  pull_request:
    branches: [main]

permissions: {}

jobs:
  codegen:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
          token: ${{ secrets.GITHUB_TOKEN }}
      - uses: actions/setup-go@v5
      - run: |
          sudo apt-get update
          sudo apt-get install -y clang llvm libbpf-dev linux-headers-generic

      - run: |
          sudo bpftool btf dump file /sys/kernel/btf/vmlinux format c > pkg/ebpf/bpf/vmlinux.h
          go generate ./pkg/ebpf/bpf

      # Check for changes. Commit and push them.
      - run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          if [ -n "$(git status --porcelain)" ]; then
            git add .
            git commit -m "Update generated code"
            git push

            exit 1 # Workflow should fail, so the PR author reviews the changes
          else
            echo "No changes to commit"
          fi