build.yml

name: Build

on:
  push:

  workflow_dispatch:
    inputs:
      go_version:
        description: 'Go version without the "go" prefix'
        required: false

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest
    concurrency:
      group: gotify-build-lock

    steps:
    - name: Checkout code
      uses: actions/checkout@v2
    
    - name: Input sanity check
      if: ${{ github.event.inputs.go_version }}
      run: |
        export GO_VERSION=${{ github.event.inputs.go_version }}
    
        MATCHES=$(curl -fsSL 'https://go.dev/dl/?mode=json&include=all' | jq --arg GO_VERSION "$GO_VERSION" -r ".[] | select (.version == \"go\" + \$GO_VERSION) | .version" | wc -l)
    
        if [ "$MATCHES" -ne 1 ]; then
          echo "Invalid Go version: $GO_VERSION, found $MATCHES matches"
          exit 1
        fi
    
    - name: Set up environment (tagged release)
      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
      run: |
        TAG_NAME=${GITHUB_REF#refs/tags/}
        GO_VERSION=${TAG_NAME#v}
        echo "GO_VERSION=$GO_VERSION" >> $GITHUB_ENV
    
    - name: Set up environment (non-tagged release)
      if: ${{ !startsWith(github.ref, 'refs/tags/v') && !github.event.inputs.go_version }}
      run: |
          GO_VERSION=$(curl -fsSL 'https://go.dev/dl/?mode=json' | jq -r '.[] | select (.stable) | .version | sub("^go"; "")' | head -n 1)
          echo "GO_VERSION=$GO_VERSION" >> $GITHUB_ENV
    
    - name: Set up environment (to-be-tagged release)
      if: ${{ !startsWith(github.ref, 'refs/tags/v') && github.event.inputs.go_version }}
      run: |
          GO_VERSION=${{ github.event.inputs.go_version }}

          git tag -s "v${GO_VERSION}" -m "Bump to Go $GO_VERSION"
          git push origin --tags

          echo "GO_VERSION=$GO_VERSION" >> $GITHUB_ENV
 
    - name: Build
      run: make build