#!/usr/bin/env bash

BASE=$(grep "^FROM" Dockerfile | head -1 | awk '{print $2}')
echo "Base image: $BASE"

docker pull $BASE
LOCAL_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' $BASE)

REMOTE_DIGEST=$(skopeo inspect docker://$BASE | jq -r .Digest)

if [ "$LOCAL_DIGEST" != "$REMOTE_DIGEST" ]; then
  echo "Base image updated!"
  exit 1
fi