Script to update docker images and to restart docker composed services, if used docker images has been updated.

update-docker-composed-service.sh

#!/bin/bash

for cmd in docker jq; do
  if ! command -v ${cmd} > /dev/null; then
    echo "Error: ${cmd} is required." 1>&2
    exit 1
  fi
done

COMPOSE_FILE="$1"

if [ -z "${COMPOSE_FILE}" ]; then
  COMPOSE_FILE="./docker-compose.yml"
fi
if [ ! -f "${COMPOSE_FILE}" ]; then
  echo "Error: docker-compose.yml not found." 1>&2
  exit 1
fi

IMAGES=$(docker compose -f ${COMPOSE_FILE} images -q)
if [ $? -ne 0 ]; then
  echo "Error: docker compose plugin not found." 1>&2
  exit 1
fi
RESTART=0
for i in $IMAGES; do
  JSON=$(docker image inspect ${i})
  TAG=$(echo $JSON | jq -r ".[].RepoTags[0]")
  DIGEST=$(echo $JSON | jq -r ".[].RepoDigests[0]")
  docker pull $TAG > /dev/null 2>&1
  DIGEST_=$(docker image inspect ${TAG} | jq -r ".[].RepoDigests[0]")
  if [ ${DIGEST} != ${DIGEST_} ]; then
    RESTART=1
  fi
done

if [ $RESTART -ne 0 ]; then
  docker compose -f ${COMPOSE_FILE} down > /dev/null 2>&1
  docker compose -f ${COMPOSE_FILE} up -d > /dev/null 2>&1
fi