name: tunasync

on: [push]

jobs:

  build:
    name: Build
    runs-on: ubuntu-latest
    steps:

    - name: Set up Go 1.16
      uses: actions/setup-go@v1
      with:
        go-version: 1.16
      id: go

    - name: Check out code into the Go module directory
      uses: actions/checkout@v2

    - name: Get dependencies
      run: |
        go get -v -t -d ./cmd/tunasync
        go get -v -t -d ./cmd/tunasynctl

    - name: Build
      run: |
        make tunasync
        make tunasynctl

    - name: Keep artifacts
      uses: actions/upload-artifact@v1
      with:
        name: tunasync-bin
        path: build-linux-amd64/

  test:
    name: Test
    runs-on: ubuntu-latest
    services:
      registry:
        image: registry:2
        ports:
          - 5000:5000
    steps:

    - name: Setup test dependencies
      run: |
        sudo apt-get update
        sudo apt-get install -y cgroup-tools
        docker pull alpine:3.8
        lssubsys -am
        sudo cgcreate -a $USER -t $USER -g cpu:tunasync
        sudo cgcreate -a $USER -t $USER -g memory:tunasync

    - name: Set up Go 1.16
      uses: actions/setup-go@v1
      with:
        go-version: 1.16
      id: go

    - name: Check out code into the Go module directory
      uses: actions/checkout@v2

    - name: Run Unit tests.
      run: |
        go install github.com/wadey/gocovmerge@latest
        TERM=xterm-256color make test

    - name: Run Additional Unit tests.
      run: |
        make build-test-worker
        sudo cgexec -g "*:/" bash -c "echo 0 > /sys/fs/cgroup/systemd/tasks; exec sudo -u $USER env USECURCGROUP=1 TERM=xterm-256color cgexec -g cpu,memory:tunasync ./worker.test -test.v=true -test.coverprofile profile2.cov -test.run TestCgroup"

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v1
      with:
        driver-opts: network=host
    - name: Cache Docker layers
      uses: actions/cache@v2
      if: github.event_name == 'push'
      with:
        path: /tmp/.buildx-cache
        key: ${{ runner.os }}-buildx-${{ github.sha }}
        restore-keys: |
          ${{ runner.os }}-buildx-
    - name: Cache Docker layers
      uses: actions/cache@v2
      if: github.event_name == 'pull_request'
      with:
        path: /tmp/.buildx-cache
        key: ${{ runner.os }}-pr-${{ github.event.pull_request.head.user.login }}-buildx-${{ github.sha }}
        restore-keys: |
          ${{ runner.os }}-pr-${{ github.event.pull_request.head.user.login }}-buildx-
          ${{ runner.os }}-buildx-
    - name: Cache Docker layers
      if: github.event_name != 'push' && github.event_name != 'pull_request'
      run: |
        echo "I do not know how to setup cache"
        exit -1

    - name: Prepare cache directory
      run: |
        mkdir -p /tmp/.buildx-cache

    - name: Build Docker image for uml rootfs
      uses: docker/build-push-action@v2
      with:
        context: .umlrootfs
        file: .umlrootfs/Dockerfile
        push: true
        tags: localhost:5000/umlrootfs
        cache-from: type=local,src=/tmp/.buildx-cache
        cache-to: type=local,dest=/tmp/.buildx-cache

    - name: Fetch and install uml package
      run: |
        sudo apt-get update
        sudo apt-get install -y debian-archive-keyring
        sudo ln -sf /usr/share/keyrings/debian-archive-keyring.gpg /etc/apt/trusted.gpg.d/
        echo "deb http://deb.debian.org/debian buster main" | sudo tee /etc/apt/sources.list.d/buster.list
        sudo apt-get update
        apt-get download user-mode-linux/buster
        sudo rm /etc/apt/sources.list.d/buster.list
        sudo apt-get update
        sudo mv user-mode-linux_*.deb /tmp/uml.deb
        sudo apt-get install --no-install-recommends -y /tmp/uml.deb
        sudo rm /tmp/uml.deb
        sudo apt-get install --no-install-recommends -y rsh-redone-client

    - name: Prepare uml environment
      run: |
        docker container create --name umlrootfs localhost:5000/umlrootfs
        sudo mkdir -p umlrootfs
        docker container export umlrootfs | sudo tar -xv -C umlrootfs
        docker container rm umlrootfs
        sudo cp -a --target-directory=umlrootfs/lib/ /usr/lib/uml/modules
        /bin/echo -e "127.0.0.1       localhost\n254.255.255.1 host" | sudo tee umlrootfs/etc/hosts
        sudo ip tuntap add dev umltap mode tap
        sudo ip addr add 254.255.255.1/24 dev umltap
        sudo ip link set umltap up

    - name: Start Uml
      run: |
        start_uml () {
          sudo bash -c 'linux root=/dev/root rootflags=/ rw rootfstype=hostfs mem=2G eth0=tuntap,umltap hostfs="$PWD/umlrootfs" con1=pts systemd.unified_cgroup_hierarchy=1 & pid=$!; echo "UMLINUX_PID=$pid" >> '"$GITHUB_ENV"
        }
        ( start_uml )
        started=0
        for i in $(seq 1 60); do
          if ping -c 1 -w 1 254.255.255.2; then
            started=1
            break
          fi
        done
        if [ "$started" != "1" ]; then
          echo "Failed to wait Umlinux online"
        fi

    - name: Prepare Uml Environment
      run: |
        CUSER="$(id --user --name)"
        CUID="$(id --user)"
        CGID="$(id --group)"
        sudo chroot umlrootfs bash --noprofile --norc -eo pipefail << EOF
          groupadd --gid "${CGID?}" "${CUSER?}"
          useradd --create-home --home-dir "/home/${CUSER}" --gid "${CGID?}" \
            --uid "${CUID?}" --shell "\$(which bash)" "${CUSER?}"
        EOF
        ln ./worker.test "umlrootfs/home/${CUSER}/worker.test"

    - name: Run Tests in Cgroupv2
      run: |
        CUSER="$(id --user --name)"
        sudo rsh 254.255.255.2 bash --noprofile --norc -eo pipefail << EOF
          cd "/home/${CUSER}"
          mkdir -p /sys/fs/cgroup/tunasync
          TERM=xterm-256color ./worker.test -test.v=true -test.coverprofile \
            profile3.cov -test.run TestCgroup
          rmdir /sys/fs/cgroup/tunasync
          systemd-run --service-type=oneshot --uid="${CUSER}" --pipe --wait \
            --property=Delegate=yes --setenv=USECURCGROUP=1 \
            --setenv=TERM=xterm-256color --same-dir \
            "\${PWD}/worker.test" -test.v=true -test.coverprofile \
            profile4.cov -test.run TestCgroup
        EOF

    - name: Stop Uml
      run: |
        sudo rsh 254.255.255.2 systemctl poweroff
        sleep 10
        if [ -e "/proc/$UMLINUX_PID" ]; then
          sleep 10
          if [ -e "/proc/$UMLINUX_PID" ]; then
            sudo kill -TERM "$UMLINUX_PID" || true
            sleep 1
          fi
        fi
        if [ -e "/proc/$UMLINUX_PID" ]; then
          sleep 10
          if [ -e "/proc/$UMLINUX_PID" ]; then
            sudo kill -KILL "$UMLINUX_PID" || true
            sleep 1
          fi
        fi

    - name: Combine coverage files
      run : |
        CUSER="$(id --user --name)"
        "${HOME}/go/bin/gocovmerge" profile.cov profile2.cov \
          "umlrootfs/home/${CUSER}/profile3.cov" \
          "umlrootfs/home/${CUSER}/profile4.cov" > profile-all.cov

    - name: Convert coverage to lcov
      uses: jandelgado/gcov2lcov-action@v1.0.0
      with:
          infile: profile-all.cov
          outfile: coverage.lcov

    - name: Coveralls
      uses: coverallsapp/github-action@v1.0.1
      with:
          github-token: ${{ secrets.github_token }}
          path-to-lcov: coverage.lcov