deploy-mirror.yml

name: Deploy Mirror

run-name: 'Deploy mirror: ${{ github.sha }}'

concurrency:
  group: deploy-mirror
  cancel-in-progress: true

on:
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

permissions:
  contents: read
  packages: write

jobs:
  deploy:
    name: Deploy Mirror
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 24

      - name: Install pnpm
        run: corepack enable && corepack prepare pnpm@latest --activate

      - name: Install and typecheck
        run: |
          pnpm install --frozen-lockfile
          pnpm typecheck

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          target: production
          push: true
          provenance: false
          sbom: false
          cache-from: type=gha
          cache-to: type=gha,mode=max
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:mirror-${{ github.sha }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:mirror-latest
          labels: ${{ steps.meta.outputs.labels }}

      - name: Start SSH agent
        uses: webfactory/ssh-agent@v0.9.0
        with:
          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}

      - name: Install sops
        run: |
          curl -LO https://github.com/getsops/sops/releases/download/v3.9.4/sops-v3.9.4.linux.amd64
          sudo mv sops-v3.9.4.linux.amd64 /usr/local/bin/sops
          sudo chmod +x /usr/local/bin/sops

      - name: Extract DEPLOY_HOST from env file
        id: host
        env:
          SOPS_AGE_KEY: ${{ secrets.SOPS_AGE_SECRET_KEY }}
        run: |
          set -euo pipefail
          DEPLOY_HOST=$(sops -d --input-type dotenv --output-type dotenv .env.dev.enc | grep '^DEPLOY_HOST=' | cut -d= -f2)
          if [[ -z "$DEPLOY_HOST" ]]; then
            echo "::error::DEPLOY_HOST not found in .env.dev.enc"
            exit 1
          fi
          echo "deploy_host=${DEPLOY_HOST}" >> $GITHUB_OUTPUT

      - name: Add known hosts
        run: |
          mkdir -p ~/.ssh
          ssh-keyscan -H "${{ steps.host.outputs.deploy_host }}" >> ~/.ssh/known_hosts 2>/dev/null

      - name: Deploy over SSH
        env:
          SSH_USER: ${{ secrets.SSH_USER }}
          DEPLOY_HOST: ${{ steps.host.outputs.deploy_host }}
          REPO: ${{ github.repository }}
          BRANCH: ${{ github.ref_name }}
          GHCR_USER: ${{ secrets.GHCR_USER }}
          GHCR_TOKEN: ${{ secrets.GHCR_TOKEN }}
          IMAGE_TAG: mirror-${{ github.sha }}
        run: |
          ssh "${SSH_USER}@${DEPLOY_HOST}" \
            "env GHCR_USER='${GHCR_USER}' GHCR_TOKEN='${GHCR_TOKEN}' IMAGE_TAG='${IMAGE_TAG}' bash -s -- '${REPO}' '${BRANCH}'" <<'EOS'
          set -euo pipefail

          REPO="${1:?missing repo}"
          BRANCH="${2:-main}"

          : "${IMAGE_TAG:?missing IMAGE_TAG}"
          : "${GHCR_USER:?missing GHCR_USER}"
          : "${GHCR_TOKEN:?missing GHCR_TOKEN}"

          STACK_NAME="underlay-mirror"
          REPO_NAME="${REPO##*/}"
          APP_DIR="/srv/${REPO_NAME}-mirror"
          REPO_SSH="git@github.com:${REPO}.git"

          ssh-keyscan -H github.com >> ~/.ssh/known_hosts 2>/dev/null
          chmod 600 ~/.ssh/known_hosts

          if [[ ! -d "${APP_DIR}/.git" ]]; then
            sudo mkdir -p "${APP_DIR}"
            sudo chown -R "$USER:$USER" "${APP_DIR}"
            git clone --branch "${BRANCH}" "${REPO_SSH}" "${APP_DIR}"
          fi

          cd "${APP_DIR}"
          git fetch --prune --tags origin
          git checkout "${BRANCH}"
          git pull origin "${BRANCH}"

          # Decrypt prod env to source S3 creds and API keys
          umask 077
          sops -d --input-type dotenv --output-type dotenv .env.prod.enc > .env
          set -a
          source <(grep -v '^#' .env | grep -v '^$')
          set +a

          # Init swarm if not already active
          if ! sudo docker info --format '{{.Swarm.LocalNodeState}}' | grep -qx active; then
            sudo docker swarm init
          fi

          echo "$GHCR_TOKEN" | sudo docker login ghcr.io -u "$GHCR_USER" --password-stdin

          sudo docker pull "ghcr.io/${REPO}:${IMAGE_TAG}"

          # Deploy using docker-compose.yml with mirror config.
          # S3 creds and API key are sourced from prod .env above.
          sudo env \
            IMAGE="ghcr.io/${REPO}" IMAGE_TAG="$IMAGE_TAG" \
            PORT=3002 APP_REPLICAS=1 \
            UNDERLAY_MODE=mirror \
            UNDERLAY_UPSTREAM="${UNDERLAY_UPSTREAM:-https://www.underlay.org}" \
            UNDERLAY_NODE_NAME="${UNDERLAY_NODE_NAME:-}" \
            S3_ENDPOINT="${S3_ENDPOINT:-}" S3_REGION="${S3_REGION:-auto}" \
            S3_ACCESS_KEY="${S3_ACCESS_KEY:-}" S3_SECRET_KEY="${S3_SECRET_KEY:-}" \
            S3_BUCKET="${S3_BUCKET:-underlay}" \
            UNDERLAY_UPSTREAM_API_KEY="${UNDERLAY_UPSTREAM_API_KEY:-}" \
            SESSION_SECRET="$(openssl rand -hex 32)" \
            docker stack deploy -c docker-compose.yml \
            --with-registry-auth --resolve-image always --prune "${STACK_NAME}"

          sudo docker stack services "${STACK_NAME}"
          echo "Mirror deployed as ${STACK_NAME} (image: ${IMAGE_TAG})"
          EOS