Quick cleanup of images for a namespace on a private Docker registry

docker-registry-cleaner.sh

#!/usr/bin/env bash

DOCKER_IMAGE_NAMESPACE=$1
DOCKER_REGISTRY=${DOCKER_REGISTRY:-registry.docker.lan}

readarray -t tags < <(curl -H “Accept: application/vnd.docker.distribution.manifest.v2+json” http://$DOCKER_REGISTRY/v2/${DOCKER_IMAGE_NAMESPACE}/tags/list | jq “.tags” | jq -r -c ‘to_entries | .[].value’)

for tag in “${tags[@]}”
do
  echo “Removing tag $tag for $DOCKER_IMAGE_NAMESPACE”
  docker_image_sha=$(curl --silent -I -H “Accept: application/vnd.docker.distribution.manifest.v2+json” -H “Content-Type: application/json” http://$DOCKER_REGISTRY/v2/$DOCKER_IMAGE_NAMESPACE/manifests/$tag | awk ‘$1 == “Docker-Content-Digest:” { print $2 }’ | tr -d $’\r’)
  echo “docker_image_sha: $docker_image_sha”
  curl -X DELETE -H “Accept: application/application/vnd.docker.distribution.manifest.v2+json” http://$DOCKER_REGISTRY/v2/${DOCKER_IMAGE_NAMESPACE}/manifests/${docker_image_sha}
done