.github/workflows/merge.yml

name: merge
on:
  pull_request_target:
    types:
      - closed

jobs:
  if_merged:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-22.04
    steps:
      - name: Restore veristat values
        id: cache-veristat-restore
        uses: actions/cache/restore@v4
        with:
          path: ${{ github.workspace }}/veristat
          key: veristat-diffs-main

      # Hard turn-off interactive mode
      - run: echo 'debconf debconf/frontend select Noninteractive' | sudo debconf-set-selections

      # Refresh packages list
      - run: sudo apt update

      ### DOWNLOAD AND INSTALL DEPENDENCIES ###

      # Download dependencies packaged by Ubuntu
      - run: sudo apt -y install bison busybox-static cargo cmake coreutils cpio elfutils file flex gcc gcc-multilib git iproute2 jq kbd kmod libcap-dev libelf-dev libunwind-dev libvirt-clients libzstd-dev linux-headers-generic linux-tools-common linux-tools-generic make ninja-build pahole pkg-config python3-dev python3-pip python3-requests qemu-kvm rsync rustc stress-ng udev zstd

      # clang 17
      # Use a custom llvm.sh script which includes the -y flag for
      # add-apt-repository. Otherwise, the CI job will hang. If and when
      # https://github.com/opencollab/llvm-jenkins.debian.net/pull/26 is
      # merged, we can go back to using https://apt.llvm.org/llvm.sh.
      - run: wget https://raw.githubusercontent.com/Decave/llvm-jenkins.debian.net/fix_llvmsh/llvm.sh
      - run: chmod +x llvm.sh
      - run: sudo ./llvm.sh all
      - run: sudo ln -sf /usr/bin/clang-17 /usr/bin/clang
      - run: sudo ln -sf /usr/bin/llvm-strip-17 /usr/bin/llvm-strip

      - uses: actions/checkout@v4

      # meson
      - run: pip install meson

      # Install virtme-ng
      - run: pip install virtme-ng

      # Get the latest sched-ext enabled kernel directly from the korg
      # for-next branch
      - run: git clone --single-branch -b for-next --depth 1 https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git linux

      # Print the latest commit of the checked out sched-ext kernel
      - run: cd linux && git log -1 --pretty=format:"%h %ad %s" --date=short

      # Build a minimal kernel (with sched-ext enabled) using virtme-ng
      - run: cd linux && vng -v --build --config ../.github/workflows/sched-ext.config

      # Generate kernel headers
      - run: cd linux && make headers

      - run: wget https://github.com/libbpf/veristat/releases/download/v0.3.2/veristat-v0.3.2-amd64.tar.gz
      - run: tar -xvf veristat-v0.3.2-amd64.tar.gz && sudo cp veristat /usr/bin/
      - run: sudo chmod +x /usr/bin/veristat && sudo chmod 755 /usr/bin/veristat

      ### END DEPENDENCIES ###

      # The actual build:
      - run: meson setup build -Dkernel=$(pwd)/linux -Dkernel_headers=./linux/usr/include -Dveristat_diff_dir=$GITHUB_WORKSPACE/veristat
      - run: meson compile -C build --jobs=1

      # Print CPU model before running the tests (this can be useful for
      # debugging purposes)
      - run: grep 'model name' /proc/cpuinfo | head -1

      # Setup KVM support
      - run: |
          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
          sudo udevadm control --reload-rules
          sudo udevadm trigger --name-match=kvm

      # run veristat
      - run: meson compile -C build veristat_diff

      # update veristat cache dirs
      - run: cd $GITHUB_WORKSPACE/veristat && for file in *_new.csv; do mv "$file" "${file%_new.csv}.csv"; done || echo "failed to update veristat cache"

      - name: Save veristat cache
        id: cache-veristat-save
        uses: actions/cache/save@v4
        with:
          path: ${{ github.workspace }}/veristat
          key: veristat-diffs-main