publish.yml

# This is a GitHub workflow defining a set of jobs with a set of steps.
# ref: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
#
name: Publish

# Trigger the workflow on pushed tags or commits to main branch.
on:
  pull_request:
    paths-ignore:
      - "docs/**"
      - "**.md"
      - ".github/workflows/*"
      - "!.github/workflows/publish.yaml"
  push:
    paths-ignore:
      - "docs/**"
      - "**.md"
      - ".github/workflows/*"
      - "!.github/workflows/publish.yaml"
    branches-ignore:
      - "dependabot/**"
      - "pre-commit-ci-update-config"
      - "update-*"
      - "vuln-scan-*"
    tags:
      - "**"

jobs:
  # Builds and pushes docker images to DockerHub and package the Helm chart and
  # pushes it to jupyterhub/helm-chart@gh-pages where index.yaml represents the
  # JupyterHub organization Helm chart repository.
  #
  # ref: https://github.com/jupyterhub/helm-chart
  # ref: https://quay.io/organization/jupyterhub

  publish:
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4
        with:
          # chartpress requires git history to set chart version and image tags
          # correctly
          fetch-depth: 0

      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Decide to publish or not
        id: publishing
        shell: python
        run: |
          import os
          repo = "${{ github.repository }}".lower()
          event = "${{ github.event_name }}"
          ref = "${{ github.event.ref }}"
          publishing = ""
          if (
              repo == "tik-nfl/zero-to-jupyterhub-k8s"
              and event == "push"
              and (
                  ref.startswith("refs/tags/")
                  or ref == "refs/heads/main"
              )
          ):
              publishing = "true"
              print("Publishing chart")
          with open(os.environ["GITHUB_OUTPUT"], "a") as f:
              f.write(f"publishing={publishing}\n")

      - name: Set up QEMU (for docker buildx)
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx (for chartpress multi-arch builds)
        uses: docker/setup-buildx-action@v3

      - name: Install chart publishing dependencies (chartpress, helm)
        run: |
          pip install chartpress pyyaml
          pip list

          helm version

      - name: Setup push rights to jupyterhub/helm-chart
        # This was setup by...
        # 1. Generating a private/public key pair:
        #    ssh-keygen -t ed25519 -C "jupyterhub/zero-to-jupyterhub-k8s" -f /tmp/id_ed25519
        # 2. Registering the private key (/tmp/id_ed25519) as a secret for this
        #    repo:
        #    https://github.com/jupyterhub/zero-to-jupyterhub-k8s/settings/secrets/actions
        # 3. Registering the public key (/tmp/id_ed25519.pub) as a deploy key
        #    with push rights for the jupyterhub/helm chart repo:
        #    https://github.com/jupyterhub/helm-chart/settings/keys
        if: steps.publishing.outputs.publishing
        run: |
          mkdir -p ~/.ssh
          ssh-keyscan github.com >> ~/.ssh/known_hosts
          echo "${{ secrets.JUPYTERHUB_HELM_CHART_DEPLOY_KEY }}" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519

      - name: Setup push rights to Docker Hub
        # This was setup by...
        # 1. Creating a Docker Hub service account "jupyterhubbot"
        # 2. Making the account part of the "bots" team, and granting that team
        #    permissions to push to the relevant images:
        #    https://hub.docker.com/orgs/jupyterhub/teams/bots/permissions
        # 3. Registering the username and password as a secret for this repo:
        #    https://github.com/jupyterhub/zero-to-jupyterhub-k8s/settings/secrets/actions
        if: steps.publishing.outputs.publishing
        run: |
          docker login -u "${{ github.actor }}" -p "${{ secrets.GITHUB_TOKEN }}" ghcr.io

      - name: Configure a git user
        # Having a user.email and user.name configured with git is required to
        # make commits, which is something chartpress does when publishing.
        # While Travis CI had a dummy user by default, GitHub Actions doesn't
        # and require this explicitly setup.
        run: |
          git config --global user.email "github-actions@example.local"
          git config --global user.name "GitHub Actions user"

      - name: build chart with chartpress
        run: |
          # Create values.schema.json from values.schema.yaml.
          ./tools/generate-json-schema.py

          # Append annotations to Chart.yaml with current images so that
          # artifacthub.io can scan and provide vulnerability reports for them.
          chartpress --no-build
          ./tools/set-chart-yaml-annotations.py

      - name: Publish images and chart with chartpress
        if: steps.publishing.outputs.publishing
        env:
          GITHUB_REPOSITORY: "${{ github.repository }}"
        run: |
          # Package the Helm chart and publish it to the gh-pages branch of
          # the jupyterhub/helm-chart repo.
          ./ci/publish

      - name: Package helm chart as a CI artifact
        if: steps.publishing.outputs.publishing == ''
        run: helm package jupyterhub

      # ref: https://github.com/actions/upload-artifact
      - uses: actions/upload-artifact@v4
        if: steps.publishing.outputs.publishing == ''
        with:
          name: jupyterhub-${{ github.sha }}
          path: "jupyterhub-*.tgz"
          if-no-files-found: error