Migrate one private docker registry into another

migrate.sh

source_acr="my.private-registry.com:5000"
target_acr="my-other.private-registry.com:5001"

# read username password for source registry (needed to query api)
echo -n "Insert Username: "
read username
echo -n "Insert Password: " 
read -s pw
echo 

# get list with all repositories
url="https://${source_acr}/v2/_catalog"
echo "Downloading from: $url"
repos=$(curl -X GET \
   -u $username:$pw \
  $url | \
  python -c "import sys, json; print(' '.join(json.load(sys.stdin)['repositories']))")

# migrate repositories
for repo in $repos; do
  echo $repo
  docker pull $source_acr/$repo --all-tags
  docker image ls $source_acr/$repo \
    --format "docker tag {{.Repository}}:{{.Tag}} $target_acr/$repo:{{.Tag}} | docker push $target_acr/$repo:{{.Tag}}" | 
    bash
  docker image ls | grep $source_acr/$repo | awk '{print $3}' | xargs docker image rm -f
done