Migrate your Docker Hub organization(docker.io) to Github Container Registry(ghcr.io).

migrate-dockerhub-to-ghcr.sh

#!/bin/bash
#
# A simple bash script to migrate your Docker Hub organization to Github Container Registry.
# forked from https://gist.github.com/charlieoleary/05c1dab2e19703f73a041e585e060dc9
#
# In order for this to work you must run this from a system that is logged in to both the GHCR 
# repository you are migrating to and the Docker Hub organization you are migrating FROM with
# podman.
#
# Due to how Docker works (pulling / pushing images), this script can be run over and over
# without any issues. 
#
# Finally, it's important to note that you will be downloading these images to the machine you
# run this script on. Be aware that it can consume a considerable amount of disk space if you
# are exporting a large number of images.
#
# REQUIRED ENVIRONMENT VARAIBLES: 
# DH_USERNAME - The Docker Hub username with permissions to the organization repositories.
# DH_PASSWORD - The password for the Docker Hub user.
# DH_ORG - The name of the Docker Hub organization you are migrating.
# 
# OPTIONAL ENVIRONMENT VARIABLES:
# DH_MAX_TAGS - The number of tags to migrate from Docker Hub to GHCR (default: 10).
#

set -e

# check to make sure required environment variables are set
if [ -z "$DH_USERNAME"  ] || [ -z "$DH_PASSWORD" ] || [ -z "$DH_ORG" ]; then
  echo "Variables DH_USERNAME, DH_PASSWORD, DH_ORG must all be set."
  exit 2
fi

# the number of docker images to migrate from dockerhub to ecr
DH_MAX_TAGS=${DH_MAX_TAGS:-10}

# get token to be able to talk to dockerhub
TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${DH_USERNAME}'", "password": "'${DH_PASSWORD}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)

# get list of repos for the organization
REPO_LIST=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${DH_ORG}/?page_size=100 | jq -r '.results|.[]|.name')

# start the migration
for repo in ${REPO_LIST}; do

  # next, get the specified number of tags in the repository
  IMAGE_TAGS=$(curl -s -H "Authorization: JWT ${TOKEN}" "https://hub.docker.com/v2/repositories/${DH_ORG}/${repo}/tags/?page_size=${DH_MAX_TAGS}" | jq -r '.results|.[]|.name')

  # build a list of images from tags
  for tag in ${IMAGE_TAGS}; do
    IMAGE_NAME=${DH_ORG}/${repo}:${tag}

    echo Pulling docker.io/"${IMAGE_NAME}"
    podman pull docker.io/"${IMAGE_NAME}"
    echo Pushing ghcr.io/"${IMAGE_NAME}"
    podman push docker.io/"${IMAGE_NAME}" ghcr.io/"${IMAGE_NAME}"
    echo adding docker.io/"${IMAGE_NAME}" and ghcr.io/"${IMAGE_NAME}" to delete list "(delete.sh)"
    echo podman rmi docker.io/"${IMAGE_NAME}" >> delete.sh
    echo podman rmi ghcr.io/"${IMAGE_NAME}" >> delete.sh
    echo :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
  done
done