cascade-image-update.yaml

name: Update Child Images

on:
  push:
    tags:
    - base/*
    - swan/*
    - swan-cern/*

jobs:
  update-dockerfiles:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout Repository
      uses: actions/checkout@v2

    - name: Set Up Git
      run: |
        git config --global user.name "github-actions"
        git config --global user.email "github-actions@github.com"

    - name: Detect Parent Image Tag
      id: detect-tag
      run: |
        if [[ "${{ github.ref }}" == refs/tags/base/* ]]; then
          echo "PARENT_IMAGE=base" >> $GITHUB_ENV
          VERSION=${{ github.ref_name#base/ }}
        elif [[ "${{ github.ref }}" == refs/tags/swan/* ]]; then
          echo "PARENT_IMAGE=swan" >> $GITHUB_ENV
          VERSION=${{ github.ref_name#swan/ }}
        elif [[ "${{ github.ref }}" == refs/tags/swan-cern/* ]]; then
          echo "PARENT_IMAGE=swan-cern" >> $GITHUB_ENV
          VERSION=${{ github.ref_name#swan-cern/ }}
        else
          echo "No matching parent image found."
          exit 0
        fi
        echo "VERSION=$VERSION" >> $GITHUB_ENV
        echo "PARENT_PATH=gitlab-registry.cern.ch/swan/docker-images/jupyter" >> $GITHUB_ENV

    - name: Update swan Dockerfile
      if: env.PARENT_IMAGE == 'base'
      run: |
        sed -i "s|^FROM ${PARENT_PATH}/base:.*|FROM ${PARENT_PATH}/base:${VERSION}|" swan/Dockerfile
        git add swan/Dockerfile

    - name: Update swan-cern Dockerfile
      if: env.PARENT_IMAGE == 'swan'
      run: |
        sed -i "s|^FROM ${PARENT_PATH}/swan:.*|FROM ${PARENT_PATH}/swan:${VERSION}|" swan-cern/Dockerfile
        git add swan-cern/Dockerfile

    - name: Update prefetcher Dockerfile
      if: env.PARENT_IMAGE == 'swan-cern'
      run: |
        sed -i "s|^FROM ${PARENT_PATH}/swan-cern:.*|FROM ${PARENT_PATH}/swan-cern:${VERSION}|" prefetcher/Dockerfile
        git add prefetcher/Dockerfile

    - name: Commit Changes
      run: |
        git commit -m "Update images to use new ${PARENT_IMAGE} image version ${VERSION}"

    - name: Push Changes and Create PR
      uses: peter-evans/create-pull-request@v6
      with:
        branch: update-${{ env.PARENT_IMAGE }}-${VERSION}
        title: "Update images to use new ${{ env.PARENT_IMAGE }} image version ${VERSION}"
        body: "This PR updates the Dockerfiles in the repository to use the new ${{ env.PARENT_IMAGE }} image version ${VERSION}."
        commit-message: "Update Dockerfiles to use new ${{ env.PARENT_IMAGE }} image version ${VERSION}"
        token: ${{ secrets.GITHUB_TOKEN }}
        delete-branch: true