diff-values-on-pr.yaml

name: Create Helm Diff

on: # yamllint disable-line rule:truthy
  pull_request:
    branches:
    - main
    paths:
    - "apps/**.yaml"

env:
  conf_live_branch: main

jobs:
  changes:
    name: Detect changes
    runs-on: ubuntu-24.04
    outputs:
      yaml_files: "${{ steps.filter.outputs.yaml_files }}"
    steps:
    - name: Checkout
      uses: actions/checkout@v4
    - name: Get changes
      uses: dorny/paths-filter@v3
      id: filter
      with:
        list-files: json
        token: "${{ secrets.GITHUB_TOKEN }}"
        filters: |
          yaml:
            - added|modified: "apps/**/*.yaml"
  helm:
    name: Diff HelmReleases
    runs-on: ubuntu-24.04
    if: ${{ needs.changes.outputs.yaml_files != '[]' }}
    needs: changes
    strategy:
      matrix:
        file: ${{ fromJson(needs.changes.outputs.yaml_files ) }}
    steps:
    - name: Checkout
      uses: actions/checkout@v4
    - name: Checkout live branch
      uses: actions/checkout@v4
      with:
        ref: main
        path: live
    - name: Setup Kubernetes Tools
      uses: yokawasa/action-setup-kube-tools@v0.11.1
      with:
        setup-tools: |
          helmv3
          yq
    - name: Create diff
      id: diff
      run: |
        hr_chart=$(yq e .spec.chart.spec.chart ${{ matrix.file }})
        hr_chart_source=$(yq e .spec.chart.spec.sourceRef.name ${{ matrix.file }})
        for file in $(find charts -name '*.yaml'); do
            if [[ $(yq e .metadata.name ${file}) != ${hr_chart_source} ]]; then continue; fi
            hr_url=$(yq e .spec.url ${file}); break;
        done
        hr_live_version=$(yq e .spec.chart.spec.version live/${{ matrix.file }})
        hr_pr_version=$(yq e .spec.chart.spec.version ${{ matrix.file }})
        if [ "$hr_live_version" = "$hr_pr_version" ]; then
          echo "::set-output name=message::$(echo "$message")"
          exit 0
        fi
        helm repo add pr "$hr_url"
        chart_live=$(helm show chart pr/"$hr_chart" --version "$hr_live_version" || true)
        chart_pr=$(helm show chart pr/"$hr_chart" --version "$hr_pr_version" || true)
        chart_diff=$((diff -u <(echo "$chart_live") <(echo "$chart_pr") || true) | tail +3)
        values_live=$(helm show values pr/"$hr_chart" --version "$hr_live_version" || true)
        values_pr=$(helm show values pr/"$hr_chart" --version "$hr_pr_version" || true)
        values_diff=$((diff -u <(echo "$values_live") <(echo "$values_pr") || true) | tail +3)
        message="**Helm Diff**"$'\n'$'\n'
        message="$message"$'\n'"\`Chart.yaml\`:"$'\n'$'\n'
        if [ -z "$chart_diff" ]; then
            message="$message"'```'$'\n'"No changes in detected in Chart.yaml"$'\n''```'
        else
            message="$message"'```diff'$'\n'"$chart_diff"$'\n''```'
        fi
        message="$message"$'\n'$'\n'$'\n'"\`Values.yaml\`:"$'\n'$'\n'
        if [ -z "$values_diff" ]; then
            message="$message"'```'$'\n'"No changes in detected in Values.yaml"$'\n''```'
        else
            message="$message"'```diff'$'\n'"$values_diff"$'\n''```'
        fi
        echo "::set-output name=message::$(echo "$message" | jq --raw-input --slurp)"
    - name: Find Comment
      uses: peter-evans/find-comment@v3
      id: fc
      with:
        issue-number: ${{ github.event.pull_request.number }}
        comment-author: 'github-actions[bot]'
        body-includes: Helm Diff

    - name: Create or update comment
      uses: peter-evans/create-or-update-comment@v4
      if: "${{ steps.diff.outputs.message != '' }}"
      with:
        comment-id: ${{ steps.fc.outputs.comment-id }}
        issue-number: ${{ github.event.pull_request.number }}
        body: "${{ fromJSON(steps.diff.outputs.message) }}"
        edit-mode: replace