update docker image with squash

update_image

#!/bin/bash
# Syntax: update_image <CONTAINER_NAME> <IMAGE_REPO>

CONTAINER_NAME="$1"
IMAGE_REPO="$2"

if [ "$CONTAINER_NAME" = "" ]; then
  echo "Error: Missing container name"; exit 1;
fi

if [ "$IMAGE_REPO" = "" ]; then
  echo "Error: Missing image repo name"; exit 1;
fi

OLD_IMAGE_ID="$(docker images | grep ${IMAGE_REPO} | awk '{print $3}')"
echo "Current image id: ${OLD_IMAGE_ID}"

echo "Start committing container '${CONTAINER_NAME}' into image '${IMAGE_REPO}'"
docker save $(docker commit ${CONTAINER_NAME} ${IMAGE_REPO}) | docker-squash -t ${IMAGE_REPO} -verbose | docker load

NEW_IMAGE_ID="$(docker images | grep ${IMAGE_REPO} | awk '{print $3}')"
echo "Final image id: ${NEW_IMAGE_ID}"

if [ "$NEW_IMAGE_ID" != "" ]; then
  echo "Stop and delete container ${CONTAINER_NAME}"
  docker stop ${CONTAINER_NAME} && docker rm ${CONTAINER_NAME}

  echo "Delete untagged images"
  docker images | grep "^<none>" | awk '{print $3}' | xargs --no-run-if-empty docker rmi
fi