A simple bash script to transfer docker images between container registries.

dit.sh

#!/bin/bash

# MIT License
#
# Copyright (c) 2020 Ioannis Polyzos
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# Docker Image Transfer (DIT) Helper
#
# Description:
#    A simple bash helper script to transfer docker images between container registries.
#
# NOTE:
#   Before using this script you should have logged in the container registries.
#
# Author: Ioannis Polyzos

unset DOCKER_FROM DOCKER_TO DOCKER_IMAGE DOCKER_IMAGE_VERSION

# parse arguments
while (( "$#" )); do
    case "$1" in
    -h|--help)
      echo "dit.sh : Docker Images Transfer (DIT) Helper aim to trasfer/copy docker images between registries."
      echo "Usage: ./dit.sh --from [SOURCE REPO] --to [DEST_REPO] --image [IMAGE] --version [VERSION]"
      echo "options: "
      echo "    -f, --from               Source repository."
      echo "    -t, --to                 Destination repository. "
      echo "    -i, --image              The image to transfer."
      echo "    -v, --version            The version of the image to transfer."
      echo "    -h, --help               Display this help message."
      exit 0
      ;;
    -f | --from)
      DOCKER_FROM=$2
      shift 2
      ;;
    -t|--to)
      DOCKER_TO=$2
      shift 2
      ;;
    -i|--image)
      DOCKER_IMAGE=$2
      shift 2
      ;;
    -v|--version)
      DOCKER_IMAGE_VERSION=$2
      shift  2
      ;;
    *)
      echo "Invalid Option: $1" 1>&2
      echo "use --help or -h for more."
      exit -1
      ;;
  esac
done

# Download original image from the source repo
docker pull ${DOCKER_FROM}/${DOCKER_IMAGE}:${DOCKER_IMAGE_VERSION}
# Tag image for transfer to the destinatio repo
docker tag ${DOCKER_FROM}/${DOCKER_IMAGE}:${DOCKER_IMAGE_VERSION} ${DOCKER_TO}/${DOCKER_IMAGE}:${DOCKER_IMAGE_VERSION}
# Push (upload) to the destination repo
docker push ${DOCKER_TO}/${DOCKER_IMAGE}:${DOCKER_IMAGE_VERSION}