artifacts/.github/workflows/offline-package-fluxcd-installer.yaml

name: Build Offline FluxCD Installer

on:
  push:
    paths:
      - '.github/workflows/offline-package-fluxcd-installer.yaml'
  workflow_dispatch:
    inputs:
      tag:
        description: "Release tag to use/sync (e.g., v2.2.0). Leave empty to use offline-fluxcd-<run_number>"
        required: false
        type: string
      chart_version:
        description: "Override Helm chart version for fluxcd-community/flux2. Leave empty to auto-resolve"
        required: false
        type: string

permissions:
  contents: write

concurrency:
  group: build-offline-fluxcd
  cancel-in-progress: false

jobs:
  build-offline-installer:
    strategy:
      matrix:
        arch: [amd64, arm64]
    runs-on: ubuntu-latest
    env:
      NERDCTL_VERSION: "2.0.3"
    outputs:
      chart_version: ${{ steps.resolve.outputs.chart_version }}
    steps:
      - uses: actions/checkout@v4

      - name: Install deps (curl, jq, helm)
        run: |
          set -euo pipefail
          sudo apt-get update -y
          sudo apt-get install -y curl jq
          curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
          helm version          

      - name: Add helm repo
        run: |
          set -euo pipefail
          helm repo add fluxcd-community https://fluxcd-community.github.io/helm-charts --force-update
          helm repo update          

      - name: Resolve chart version
        id: resolve
        env:
          OVERRIDE_CHART_VERSION: ${{ github.event.inputs.chart_version }}
        run: |
          set -euo pipefail
          if [ -n "${OVERRIDE_CHART_VERSION}" ]; then
            CHART_VERSION="${OVERRIDE_CHART_VERSION}"
          else
            CHART_VERSION=$(helm search repo fluxcd-community/flux2 --versions | awk 'NR==2{print $2}')
          fi
          echo "chart_version=${CHART_VERSION}" >> "$GITHUB_OUTPUT"          

      - name: Prepare directories
        run: |
          set -euo pipefail
          rm -rf offline-installer
          mkdir -p offline-installer/{images,charts,scripts,metadata}          

      - name: Stage installer script
        env:
          CHART_VERSION: ${{ steps.resolve.outputs.chart_version }}
        run: |
          set -euo pipefail
          cat <<'SCRIPT' > offline-installer/scripts/install-fluxcd.sh          
#!/usr/bin/env bash
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CHART_DIR="${ROOT_DIR}/charts/flux2"
IMAGES_DIR="${ROOT_DIR}/images"
RELEASE_NAME="${RELEASE_NAME:-flux-system}"
NAMESPACE="${NAMESPACE:-flux-system}"

if command -v nerdctl >/dev/null 2>&1; then
  LOADER="nerdctl"
elif command -v docker >/dev/null 2>&1; then
  LOADER="docker"
else
  echo "Either docker or nerdctl is required to load images." >&2
  exit 1
fi

for tar in "${IMAGES_DIR}"/*.tar; do
  [ -f "$tar" ] || continue
  echo "Loading image: $tar"
  "$LOADER" load -i "$tar"
done

echo "Installing/Upgrading FluxCD release ${RELEASE_NAME} in namespace ${NAMESPACE}"
helm upgrade --install "${RELEASE_NAME}" "${CHART_DIR}" \
  --namespace "${NAMESPACE}" \
  --create-namespace \
  "$@"
SCRIPT
          chmod +x offline-installer/scripts/install-fluxcd.sh
          cat <<EOFMETA > offline-installer/metadata/INFO
chart: fluxcd-community/flux2
chart_version: ${CHART_VERSION}
created_at: $(date -u +%Y-%m-%dT%H:%M:%SZ)
EOFMETA

      - name: Download nerdctl binary for ${{ matrix.arch }}
        run: |
          set -euo pipefail
          wget https://github.com/containerd/nerdctl/releases/download/v${NERDCTL_VERSION}/nerdctl-${NERDCTL_VERSION}-linux-${{ matrix.arch }}.tar.gz \
            -O offline-installer/nerdctl.tar.gz          

      - name: Pull & export required images
        env:
          CHART_VERSION: ${{ steps.resolve.outputs.chart_version }}
        run: |
          set -euo pipefail
          PLATFORM="linux/${{ matrix.arch }}"
          helm template flux fluxcd-community/flux2 --version "${CHART_VERSION}" > manifest.yaml
          mapfile -t images < <(grep -oP 'image:\s*"?\K([^"\s]+)' manifest.yaml | sort -u || true)
          rm -f manifest.yaml
          for img in "${images[@]}"; do
            [ -n "$img" ] || continue
            if [[ "$img" == *"{{"* ]]; then
              continue
            fi
            echo "Pulling $img for ${PLATFORM}"
            if ! docker pull --platform "${PLATFORM}" "$img"; then
              echo "::warning::Failed to pull $img for ${PLATFORM}, skipping" >&2
              continue
            fi
            safe=$(echo "$img" | tr '/:' '-_')
            docker save "$img" -o "offline-installer/images/${safe}.tar"
          done          

      - name: Download Helm chart
        env:
          CHART_VERSION: ${{ steps.resolve.outputs.chart_version }}
        run: |
          set -euo pipefail
          helm pull fluxcd-community/flux2 --version "${CHART_VERSION}" --untar --untardir offline-installer/charts          

      - name: Package offline installer
        run: |
          set -euo pipefail
          tar -czf offline-setup-fluxcd-${{ matrix.arch }}.tar.gz -C offline-installer .
          ls -lh offline-setup-fluxcd-${{ matrix.arch }}.tar.gz          

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: offline-setup-fluxcd-${{ matrix.arch }}
          path: offline-setup-fluxcd-${{ matrix.arch }}.tar.gz