action.yml

name: 'Illarion versioning for docker images'
description: 'This action creates all the version information for the docker images handled by Illarion in one go.'
inputs:
  image-name:
    description: 'The name of the image, including the registry, but excluding the tag. The name will be normalized to lower case.'
    required: false
    default: 'ghcr.io/${{ github.repository }}'
  latest-on-tags:
    description: 'Set the "latest" tag on images that are build from tags.'
    required: false
    default: true
  latest-on-branches:
    description: 'Set the "latest" tag on images for branches matching this expression'
    required: false
    default: ''
  registry-secret:
    description: 'The secret that is used to push the images to the registry. This is used to check if the secret is around and set the docker-secret output.'
    required: false
    default: ''
outputs:
  version: 
    description: "The version of the image"
    value: ${{ steps.generate-versions.outputs.version }}
  tags: 
    description: "The tags that are supposed to be applied to the image"
    value: ${{ steps.generate-versions.outputs.tags }}
  created: 
    description: "The creation date of the image"
    value: ${{ steps.generate-versions.outputs.created }}
  docker-secret: 
    description: "The password that can be used to authenticate with the docker registry"
    value: ${{ steps.generate-versions.outputs.docker_secret }}
  has-docker-secret: 
    description: "This is set to 'true' in case the secret for the docker authentication is set."
    value: ${{ steps.generate-versions.outputs.has_docker_secret }}
runs:
  using: "composite"
  steps: 
    - name: Generate docker versions
      id: generate-versions
      shell: bash
      env:
        IMAGE_NAME: ${{ inputs.image-name }}
      run: |
        DOCKER_IMAGE=${IMAGE_NAME,,}

        VERSION_SOURCE=?
        if [[ $GITHUB_REF == refs/tags/* ]]; then
          VERSION=${GITHUB_REF#refs/tags/}
          VERSION_SOURCE=TAG
        elif [[ $GITHUB_REF == refs/heads/* ]]; then
          VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
          VERSION_SOURCE=BRANCH
        elif [[ $GITHUB_REF == refs/pull/* ]]; then
          VERSION=pr-${{ github.event.number }}
          VERSION_SOURCE=PR
        fi

        TAGS="${DOCKER_IMAGE}:${VERSION}"

        LATEST_IS_SET=false
        LABEL_VERSION=${VERSION}
        if [[ "$VERSION_SOURCE" == "TAG" ]]; then
          if [[ $VERSION =~ ^.+\..+$ ]]; then
            LAST_VERSION=${VERSION}
            VERSION=${VERSION%.*}
            while [ "${VERSION}" != "${LAST_VERSION}" ]
            do
              TAGS="$TAGS,${DOCKER_IMAGE}:${VERSION}"
              LAST_VERSION=${VERSION}
              VERSION=${VERSION%.*}
            done
          fi
          if [[ "${{ inputs.latest-on-tags }}" == "true" ]]; then
            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
            LATEST_IS_SET=true
          fi
        elif [ "${{ github.event_name }}" = "push" ]; then
            TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
        fi
        
        if [[ "$LATEST_IS_SET" == "false" ]]; then
          if [ -n "${{ inputs.latest-on-branches }}" ]; then
            if [[ $VERSION =~ "${{ inputs.latest-on-branches }}" ]]; then
              TAGS="$TAGS,${DOCKER_IMAGE}:latest"
              LATEST_IS_SET=true
            fi
          fi
        fi

        if [ -n "${{ inputs.registry-secret }}" ]; then
          DOCKER_SECRET=${{ inputs.registry-secret }}
        fi

        if [ "${{ github.event_name }}" != 'pull_request' ] && [ -n "${DOCKER_SECRET}" ]; then
          HAS_SECRET=true
        else
          HAS_SECRET=false
          DOCKER_SECRET=
        fi

        echo "Version: ${LABEL_VERSION}"
        echo "Tags: ${TAGS}"
        echo "Secret available: ${HAS_SECRET}"

        echo "version=${LABEL_VERSION}" >> $GITHUB_OUTPUT
        echo "tags=${TAGS}" >> $GITHUB_OUTPUT
        echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
        echo "has_docker_secret=${HAS_SECRET}" >> $GITHUB_OUTPUT
        echo "docker_secret=${DOCKER_SECRET}" >> $GITHUB_OUTPUT