bash script to delete images from docker registry using search keyword

clean.docker.registry.sh

#!/bin/bash
# Please follow this artical to allow registry deleation https://azizunsal.github.io/blog/post/delete-images-from-private-docker-registry/#override-the-registry-configuration
# Usage ./clean.docker.registry.sh -r registryUrl -u login -f stringFilter -t tagToKeep

SHORT=r:,u:,f:,k:,h
LONG=dockerRegistry:,user:,imagesFilter:,keepTag:,help
OPTS=$(getopt -a -n clean.docker.regisrty.sh --options $SHORT --longoptions $LONG -- "$@")

eval set -- "$OPTS"

while :
do
  case $1 in
    -r | --dockerRegistry )
      dockerRegistry="$2"
      shift 2
      ;;
    -u | --user )
      user="$2"
      shift 2
      ;;
    -f | --imagesFilter )
      imagesFilter="$2"
      shift 2
      ;;
    -k | --keepTag )
      keepTag="$2"
      shift 2
      ;;
    -h | --help)
      "#usage ./clean.docker.registry.sh -r registryUrl -u login -f stringFilter -t tagToKeep"
      exit 2
      ;;
    --)
      shift;
      break
      ;;
    *)
      echo "Unexpected option: $1"
      ;;
  esac
done

echo -e "\nDocker Registry: ${dockerRegistry}"
echo -e "User: ${user}"
echo -e "ImagesFilter: ${imagesFilter}"

# read the password
echo -n Password:
read -s password

AUTH=$(echo -ne "${user}:${password}" | base64 --wrap 0)

# get the list of images names that match the filter
images=$(curl -H "Authorization: Basic ${AUTH}" -s --insecure  ${dockerRegistry}/v2/_catalog | jq -r '.repositories[] | select(. | contains("'${imagesFilter}'"))')

for image in $images ; do
       # get the list of tags for each image

        tags=$(curl  -H "Authorization: Basic ${AUTH}" -s --insecure ${dockerRegistry}/v2/${image}/tags/list | jq -r .tags[] | sort -r)

        for tag in $tags ; do
            if [[ "${tag}" != "${keepTag}" ]]; then
                 echo "${image}:${tag}"

                 # get the digest of the image:tag
                 digest=$(curl -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -H "Authorization: Basic ${AUTH}" -v -s --insecure "${dockerRegistry}/v2/${image}/manifests/${tag}" 2>&1  | grep -e "digest:*" | awk '{ sub(/\r/,"",$3) ; print $3 }')

                if [ -z $digest ] ; then
                     echo "${image}:${tag} not found"
                else
                     echo "Deleting ${image}:${tag}:${digest}"
                     curl -XDELETE -w "[%{http_code}]\n"  -H "Authorization: Basic ${AUTH}" --insecure ${dockerRegistry}'/v2/'${image}'/manifests/'${digest}
                     echo "..."
                fi
            else
                echo "Keep ${image}:${tag}"
            fi
        done
done