Remove Kubernetes namespaces with prejudice

oc-nuke

#!/bin/bash

# This script is a kubectl/oc plugin that will start namespace deletion,
# watch the namespace conditions for resources blocking on finalizers,
# and remove those finalizers from the blocking resources

# TODO: Does not yet work against core resource types.  The regex doesn't get them.

NAMESPACE=$1
if ! oc get ns ${NAMESPACE} &>/dev/null; then
    echo "namespace ${NAMESPACE} not found"
    exit 1
fi
(oc delete ns ${NAMESPACE} &>/dev/null) &
while oc get ns ${NAMESPACE} &>/dev/null; do
    sleep 1
    MSG=$(oc get ns ${NAMESPACE} -ojson | jq '.status.conditions[] | select(.reason == "SomeResourcesRemain") | .message')
    for RESOURCETYPE in $(echo ${MSG} | egrep -o -E "(([a-zA-Z](-?[a-zA-Z0-9])*)\.)+[a-zA-Z]{2,}"); do
        for RESOURCE in $(oc get ${RESOURCETYPE} -n ${NAMESPACE} -oname); do
            echo "removing finalizer on ${RESOURCE}"
            oc patch -n ${NAMESPACE} ${RESOURCE} --type merge -p '{"metadata":{"finalizers": []}}' >/dev/null
        done
    done
done
wait
echo "namespace ${NAMESPACE} nuked"