action.yml

name: 'Docker Sync Action'
description: 'Keeps docker images in sync between registries or repositories'
author: 'Pavel Titenkov'

branding:
  icon: 'package'
  color: 'blue'

inputs:
  source:
    description: source image repository
    required: true
  destination:
    description: destination image repository
    required: true
  source-transport:
    description: source transport type (containers-storage,dir,docker,docker-archive,docker-daemon,oci,oci-archive,ostree,tarball)
    required: false
    default: docker
  destination-transport:
    description: destination transport type (containers-storage,dir,docker,docker-archive,docker-daemon,oci,oci-archive,ostree,tarball)
    required: false
    default: docker
  source-credentials:
    description: source credentials
    required: false
    default: 'null'
  destination-credentials:
    description: destination credentials
    required: false
    default: 'null'
  source-tls:
    description: require HTTPS and verify certificates when talking to the container registry or daemon
    required: false
    default: 'false'
  destination-tls:
    description: require HTTPS and verify certificates when talking to the container registry or daemon
    required: false
    default: 'false'
  format:
    description: MANIFEST TYPE (oci, v2s1, or v2s2) to use in the destination (default is manifest type of source, with fallbacks)
    required: false
    default: v2s2
  versions:
    description: docker image tags to sync (multi-line)
    required: false
    default: ''
runs:
  using: composite
  steps:
  - id: sync
    run: |
      echo -e "${PURPLE}> 🚜 Syncing docker images ${BLANK}"
      echo -e "${YELLOW}> Using skopeo version: ${BLANK}"
      skopeo --version

      if [ "${{ inputs.source-transport }}" = "dir" ]; then
        SOURCE_DELIMITER=":/"
      elif [ "${{ inputs.source-transport }}" = "docker" ]; then
        SOURCE_DELIMITER="://"
      else
        SOURCE_DELIMITER=":"
      fi

      if [ "${{ inputs.destination-transport }}" = "dir" ]; then
        DESTINATION_DELIMITER=":/"
      elif [ "${{ inputs.destination-transport }}" = "docker" ]; then
        DESTINATION_DELIMITER="://"
      else
        DESTINATION_DELIMITER=":"
      fi

      echo -e "${YELLOW}> 🐳 Docker source repository ${BLANK}"
      skopeo inspect ${{ inputs.source-transport }}${SOURCE_DELIMITER}${{ inputs.source }} --tls-verify=${{ inputs.source-tls }} --creds=${{ inputs.source-credentials }}

      echo -e "${YELLOW}> 📦 Transfer docker images from ${{ inputs.source }} to ${{ inputs.destination }} ${BLANK}"

      if [ "${{ inputs.versions }}" = "" ]; then

        skopeo sync --format ${{ inputs.format }} \
                  --src=${{ inputs.source-transport }} \
                  --src-tls-verify=${{ inputs.source-tls }} \
                  --src-creds=${{ inputs.source-credentials }} \
                  --dest=${{ inputs.destination-transport }} \
                  --dest-tls-verify=${{ inputs.destination-tls }} \
                  --dest-creds=${{ inputs.destination-credentials }} \
                  ${{ inputs.source }} \
                  ${{ inputs.destination }}

      else

        echo "${{ inputs.versions }}" | while read version ; do

          if [ "$version" = "" ]; then
            break
          fi

          echo -e "${YELLOW}> 📦 Transfer tag $version"

          skopeo copy --format ${{ inputs.format }} \
                  --src-tls-verify=${{ inputs.source-tls }} \
                  --src-creds=${{ inputs.source-credentials }} \
                  --dest-tls-verify=${{ inputs.destination-tls }} \
                  --dest-creds=${{ inputs.destination-credentials }} \
                  ${{ inputs.source-transport }}${SOURCE_DELIMITER}${{ inputs.source }}:$version \
                  ${{ inputs.destination-transport }}${DESTINATION_DELIMITER}${{ inputs.destination }}:$version

        done

      fi

      echo -e "${YELLOW}> ✅ Sync is complete. See details above ${BLANK}"
    shell: bash
    env:
      RED: \033[1;31m
      GREEN: \033[1;32m
      YELLOW: \033[1;33m
      BLUE: \033[1;34m
      PURPLE: \033[1;35m
      CYAN: \033[1;36m
      BLANK: \033[0m