dotfiles/home/.bin/kube-clean-replicasets

#!/usr/bin/env bash

source .utils

NAMESPACE="$(kubectl config view --minify --output 'jsonpath={..namespace}' &>/dev/null)"
set -e
NAMESPACE=${NAMESPACE:-default}
LABEL=""
ALL_NAMESPACES=false

print_usage() {
  blue "kube-clean-replicasets - Remove all olf ReplicaSets with 0 desired pods"
  echo " "
  underline "Usage:"
  echo "kube-clean-replicasets [options]"
  echo " "
  underline "Options:"
  echo "-h, --help            show this help text"
  echo "-n, --namespace       the namespace the to search in"
  echo "-l, --selector        the label selector to match on"
  echo "-A, --all-namespaces  match resources in all namespaces (default: false)"
}

while test $# -gt 0; do
  case "$1" in
    -n|--namespace)
      shift
      NAMESPACE=$1
      shift
      ;;
    -l|--selector)
      shift
      LABEL=$1
      shift
      ;;
    -A|--all-namespaces)
      ALL_NAMESPACES=true
      shift
      ;;
    -h|--help)
      print_usage
      exit 0
      ;;
    *)
      break
      ;;
  esac
done

if [[ "${LABEL}" != "" ]]; then
  LABEL="-l ${LABEL}"
fi

if [ $ALL_NAMESPACES ]; then
  kubectl get replicasets --all-namespaces $LABEL -o jsonpath='{range .items[?(@.status.replicas==0)]}--namespace {@.metadata.namespace} {@.metadata.name};{end}'  | \
    tr ";" "\n" | \
    xargs -I {} sh -c "kubectl delete rs {}"
else
  kubectl get replicasets --namespace $NAMESPACE $LABEL -o jsonpath='{range .items[?(@.status.replicas==0)]}--namespace {@.metadata.namespace} {@.metadata.name};{end}'  | \
    tr ";" "\n" | \
    xargs -I {} sh -c "kubectl delete rs {}"
fi