build.yml

# SPDX-FileCopyrightText: © Vegard IT GmbH (https://vegardit.com) and contributors
# SPDX-FileContributor: Sebastian Thomschke (https://sebthom.de), Vegard IT GmbH (https://vegardit.com)
# SPDX-License-Identifier: EPL-2.0
# SPDX-ArtifactOfProjectHomePage: https://github.com/vegardit/no-npe
#
# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
name: Build

on:
  push:
    branches-ignore:  # build all branches except:
    - 'dependabot/**'  # prevent GHA triggered twice (once for commit to the branch and once for opening/syncing the PR)
    tags-ignore:  # don't build tags
    - '**'
    paths-ignore:
    - '**/*.adoc'
    - '**/*.md'
    - '.editorconfig'
    - '.git*'
    - '.github/*.yml'
    - '.github/workflows/stale.yml'
    - '.github/workflows/update-eea-files.yml'
  pull_request:
    paths-ignore:
    - '**/*.adoc'
    - '**/*.md'
    - '.editorconfig'
    - '.git*'
    - '.github/*.yml'
  workflow_dispatch:
    # https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/
    inputs:
      additional_maven_args:
        description: 'Additional Maven Args'
        required: false
        default: ''
      debug-with-ssh:
        description: "Start an SSH session for debugging purposes at the end of the build:"
        default: never
        type: choice
        options: [ always, on_failure, on_failure_or_cancelled, never ]
      debug-with-ssh-only-for-actor:
        description: "Limit access to the SSH session to the GitHub user that triggered the job."
        default: true
        type: boolean


defaults:
  run:
    shell: bash


jobs:

  ###########################################################
  maven-build:
  ###########################################################
    runs-on: ubuntu-latest


    # https://docs.github.com/en/actions/using-jobs/using-concurrency
    concurrency:
      group: ${{ github.workflow }}-${{ github.ref }}
      cancel-in-progress: false


    steps:
    - name: "Show: GitHub context"
      env:
        GITHUB_CONTEXT: ${{ toJSON(github) }}
      run: echo $GITHUB_CONTEXT


    - name: "Show: environment variables"
      run: env | sort


    - name: Git Checkout
      uses: actions/checkout@v4  # https://github.com/actions/checkout


    - name: "Install: JDK 11 ☕"
      uses: actions/setup-java@v4  # https://github.com/actions/setup-java
      with:
        distribution: temurin
        java-version: 11
    - run: echo "JAVA11_HOME=$JAVA_HOME" >> $GITHUB_ENV


    - name: "Install: JDK 17 ☕"
      uses: actions/setup-java@v4  # https://github.com/actions/setup-java
      with:
        distribution: temurin
        java-version: 17
    - run: echo "JAVA17_HOME=$JAVA_HOME" >> $GITHUB_ENV


    - name: "Install: JDK 21 ☕"
      uses: actions/setup-java@v4  # https://github.com/actions/setup-java
      with:
        distribution: temurin
        java-version: 21
    - run: echo "JAVA21_HOME=$JAVA_HOME" >> $GITHUB_ENV


    - name: "Install: Maven 📦"
      uses: stCarolas/setup-maven@v5  # https://github.com/stCarolas/setup-maven
      with:
        maven-version: 3.9.9


    - name: "Cache: Restore"
      id: cache-restore
      if: ${{ !env.ACT }}  # https://github.com/nektos/act#skipping-steps
      uses: actions/cache/restore@v4  # https://github.com/actions/cache/blob/main/restore/README.md
      with:
        path: |
          ~/.m2/bin
          ~/.m2/repository
        key: ${{ runner.os }}-${{ hashFiles('**/pom.xml') }}


    - name: Test with Maven
      if: ${{ github.ref_name != 'main' || env.ACT }}
      env:
        GITHUB_USER: ${{ github.actor }}
        GITHUB_API_KEY: ${{ github.token }}
        MAY_CREATE_RELEASE: false
      run: |
        bash .ci/build.sh ${{ github.event.inputs.additional_maven_args }}


    - name: Prepare Maven Snapshots Repo
      if: ${{ github.ref_name == 'main' && !env.ACT }}
      run: |
        set -eux

        cd /tmp
        github_repo_url="https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}/"
        if curl --output /dev/null --silent --head --fail "$github_repo_url/tree/mvn-snapshots-repo"; then
          git clone https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}/ --single-branch --branch mvn-snapshots-repo mvn-snapshots-repo
          cd mvn-snapshots-repo
          # https://github.community/t/github-actions-bot-email-address/17204
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git reset --hard HEAD^ # revert previous commit
        else
          git clone https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}/ mvn-snapshots-repo
          cd mvn-snapshots-repo
          git checkout --orphan mvn-snapshots-repo
          git rm -rf .
          cat <<EOF > index.html
            <!DOCTYPE html>
            <html>
            <head>
              <title>${{ github.repository }} - Maven Snapshots Repo</title>
            </head>
            <body>
            <h1>${{ github.repository }} - Maven Snapshots Repo</h1>
            </body>
            </html>
        EOF
          git add index.html
          # https://github.community/t/github-actions-bot-email-address/17204
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git commit -am "Initialize Maven Snapshots Repo"
        fi


    - name: "Build with Maven 🔨"
      if: ${{ github.ref_name == 'main' && !env.ACT }}
      env:
        GITHUB_USER: ${{ github.actor }}
        GITHUB_API_KEY: ${{ secrets.GH_API_TOKEN }}
        MAY_CREATE_RELEASE: true
        SIGN_KEY: ${{ secrets.GPG_SIGN_KEY }}
        SIGN_KEY_PASS: ${{ secrets.GPG_SIGN_KEY_PWD }}
        SONATYPE_CENTRAL_USER: ${{ vars.SONATYPE_CENTRAL_USER }}
        SONATYPE_CENTRAL_TOKEN: ${{ secrets.SONATYPE_CENTRAL_TOKEN }}
      run: |
        set -eu

        # https://github.community/t/github-actions-bot-email-address/17204
        git config --global user.name "github-actions[bot]"
        git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
        bash .ci/build.sh \
          ${{ github.event.inputs.additional_maven_args }} \
          -DaltSnapshotDeploymentRepository=temp-snapshots-repo::file:///tmp/mvn-snapshots-repo


    - name: Update Maven Snapshots Repo
      if: ${{ github.ref_name == 'main' && !env.ACT }}
      run: |
        cd /tmp/mvn-snapshots-repo
        if [[ $(git -C . ls-files -o -m -d --exclude-standard | wc -l) -gt 0 ]]; then
          git add --all
          git commit -am "Deploy snapshot version"
          git push origin mvn-snapshots-repo --force
        fi


    ##################################################
    # Cache Update
    # See https://github.com/actions/cache/issues/342#issuecomment-1399442670
    ##################################################
    - name: "Cache: Delete Previous"
      if: ${{ steps.cache-restore.outputs.cache-hit && !env.ACT }}
      env:
        GH_TOKEN: ${{ github.token }}
      run: |
        gh extension install actions/gh-actions-cache
        # "|| true" is to avoid "Error: Resource not accessible by integration" from failing the job 
        gh actions-cache delete ${{ steps.cache-restore.outputs.cache-primary-key }} --confirm || true

    - name: "Cache: Update"
      uses: actions/cache/save@v4  # https://github.com/actions/cache/blob/main/save/README.md
      if: ${{ always() && !cancelled() && !env.ACT }} # save cache even fails
      with:
        path: |
          ~/.m2/bin
          ~/.m2/repository
          !~/.m2/repository/com/vegardit/maven
          !~/.m2/repository/*SNAPSHOT*
        key: ${{ steps.cache-restore.outputs.cache-primary-key }}


    ##################################################
    # Setup SSH debug session
    ##################################################
    - name: "SSH session for debugging: check"
      id: DEBUG_SSH_SESSSION_CHECK
      if: always()
      run: |
        set -eu

        when="${{ inputs.debug-with-ssh }}"

        if [[ $when == "always" ]] || case "${{ job.status }}" in
          success)   [[ $when == "always" ]] ;;
          cancelled) [[ $when == "on_failure_or_cancelled" ]] ;;
          failure)   [[ $when == "on_failure"* ]] ;;
        esac; then
          echo "start_ssh_session=true" | tee -a "$GITHUB_OUTPUT"
        fi


    - name: "SSH session for debugging: start"
      uses: mxschmitt/action-tmate@v3  # https://github.com/mxschmitt/action-tmate
      if: always() && steps.DEBUG_SSH_SESSSION_CHECK.outputs.start_ssh_session
      with:
        limit-access-to-actor: ${{ inputs.debug-with-ssh-only-for-actor }}


  ###########################################################
  dependabot-pr-auto-merge:
  ###########################################################
    needs: maven-build
    if: ${{ github.event_name == 'pull_request' && github.actor == 'dependabot[bot]' }}
    runs-on: ubuntu-latest

    concurrency: dependabot-pr-auto-merge

    permissions:
      contents: write
      pull-requests: write

    steps:
    - name: Dependabot metadata
      id: metadata
      uses: dependabot/fetch-metadata@v2  # https://github.com/dependabot/fetch-metadata/
      with:
        github-token: "${{ secrets.GITHUB_TOKEN }}"


    - name: Enable auto-merge for Dependabot PRs
      if: |
        ${{
          (
            steps.dependabot-metadata.outputs.package-ecosystem == 'github-actions' && 
            steps.metadata.outputs.update-type == 'version-update:semver-major'
          ) || (
            steps.dependabot-metadata.outputs.package-ecosystem == 'maven' && 
            steps.metadata.outputs.update-type == 'version-update:semver-minor'
          )
        }}
      run: |
        gh pr merge --auto --rebase "$PR_URL"
      env:
        PR_URL: ${{github.event.pull_request.html_url}}
        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}