name: gomod-tidy
on: [push, pull_request]
jobs:
  build:
    name: Check go mod tidy
    runs-on: ubuntu-latest
    steps:
    - name: Set up Go 1.16
      uses: actions/setup-go@v1
      with:
        go-version: 1.16
      id: go

    - name: Tune the OS
      run: |
        echo '1024 65535' | sudo tee -a /proc/sys/net/ipv4/ip_local_port_range

    # TEMPORARY WHILE GITHUB FIXES THIS https://github.com/actions/virtual-environments/issues/3185
    - name: Add the current IP address, long hostname and short hostname record to /etc/hosts file
      run: |
        echo -e "$(ip addr show eth0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)\t$(hostname -f) $(hostname -s)" | sudo tee -a /etc/hosts
    # DON'T FORGET TO REMOVE CODE ABOVE WHEN ISSUE IS ADRESSED!

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

    - name: Run go mod tidy
      run: |
        set -e
        go mod tidy
        output=$(git status -s)
        if [ -z "${output}" ]; then
          exit 0
        fi
        echo 'We wish to maintain a tidy state for go mod. Please run `go mod tidy` on your branch, commit and push again.'
        echo 'Running `go mod tidy` on this CI test yields with the following changes:'
        echo "$output"
        exit 1