dotfiles/home/.bin/kube-disable-webhook

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#!/usr/bin/env bash
source .utils
set -e
WEBHOOK_TYPE="mutating"
print_usage() {
blue "kube-disable-webhook - Disabled a webhook by modifying the namespace selector"
echo " "
underline "Usage:"
echo "kube-disable-webhook [options] NAME"
echo " "
underline "Options:"
echo "-h, --help show this help text"
echo "-t, --type the type of webhook [mutating (default), validating]"
}
while test $# -gt 0; do
case "$1" in
-t|--type)
shift
WEBHOOK_TYPE=$1
shift
;;
-h|--help)
print_usage
exit 0
;;
*)
break
;;
esac
done
NAME=${1}
FAKE_SELECTOR='"namespaceSelector":{"matchExpressions":[{"key":"disabled","operator":"In","values":["webhook"]}]}'
if [[ "${WEBHOOK_TYPE}" == "mutating" ]]; then
printf "🚫 Disabling mutating webhook ${NAME}..."
kubectl annotate mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} previous-state='kubectl get mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o json'
HOOKS=$(kubectl get mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o go-template='{{range .webhooks}}{{.name}}{{"\n"}}{{end}}')
for HOOK in ${HOOKS}
do
kubectl patch mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -p '{"webhooks": [{"name": "'${HOOK}'", '${FAKE_SELECTOR}'}]}' 1>/dev/null
done
printf " ✅ Done"
elif [[ "${WEBHOOK_TYPE}" == "validating" ]]; then
printf "🚫 Disabling validating webhook ${NAME}..."
kubectl annotate validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} previous-state='kubectl get validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o json'
HOOKS=$(kubectl get validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o go-template='{{range .webhooks}}{{.name}}{{"\n"}}{{end}}')
for HOOK in ${HOOKS}
do
kubectl patch validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -p '{"webhooks": [{"name": "'${HOOK}'", '${FAKE_SELECTOR}'}]}' 1>/dev/null
done
printf " ✅ Done"
else
echo "Unknown webhook type"
exit 1
fi