Delete crds and all resources matching a suffix

delete-crds.sh

#!/bin/bash

CRD_SUFFIX=${1}

if [ -z "${CRD_SUFFIX}" ]; then
  echo "Missing CRD suffix"
  exit 1
fi

echo "Removing CRDs with suffix ${CRD_SUFFIX}"
echo

for crd in $(kubectl get crd -o name | grep "${CRD_SUFFIX}"); do
  resource=$(echo "${crd}" | cut -d'/' -f2)

  for app in $(kubectl get "${resource}" -o name); do
    echo
    echo "-> Removing finalizers from ${app}"
    kubectl get "${app}" -o json | jq '.metadata.finalizers = null' | kubectl apply -f -
    echo
    echo "-> Deleting ${app}"
    name=$(echo $app | cut -d'/' -f2)
    kubectl delete "${resource}" "${name}"
  done

  echo
  echo "-> Deleting ${crd}"
  kubectl delete crd "${resource}"
done