Script to delete context and orphan user and context from kubeconfig

delete-context-and-orphan-user-and-cluster-from-kubeconfig.sh

#!/bin/bash

if [[ "$#" -ne 1 ]]; then
  echo "Wrong number of arguments, expected 1, got $#."
  exit 1
fi

CONTEXT_NAME=$1

KUBECONFIG="${KUBECONFIG:-~/.kube/config}"

echo "About to remove context '$CONTEXT_NAME' from '$KUBECONFIG'."

CONTEXT=$(kubectl config get-contexts $CONTEXT_NAME)

if [[ $? -ne 0 ]]; then
  echo "Failed getting context '$CONTEXT_NAME' from '$KUBECONFIG'."
  exit 1
fi

CONTEXT=$(echo "$CONTEXT" | tail -n1)

CONTEXT_CLUSTER=$(echo "$CONTEXT" | awk '{print $3}')
CONTEXT_USER=$(echo "$CONTEXT" | awk '{print $4}')

CLUSTER_CONTEXTS=$(kubectl config view | yq -r '.contexts[].context.cluster' | grep $CONTEXT_CLUSTER)

if [[ $(echo "$CLUSTER_CONTEXTS" | wc -l) -gt 1 ]]; then
  echo "Cluster '$CONTEXT_CLUSTER' is used in other contexts: '$CLUSTER_CONTEXTS', not removing."
else
  echo "Single use of cluster '$CONTEXT_CLUSTER', removing."
  kubectl config delete-cluster $CONTEXT_CLUSTER
fi

USER_CONTEXTS=$(kubectl config view | yq -r '.contexts[].context.user' | grep $CONTEXT_USER)

if [[ $(echo "$USER_CONTEXTS" | wc -l) -gt 1 ]]; then
  echo "User '$USER_CLUSTER' is used in other contexts: '$USER_CONTEXTS', not removing."
else
  echo "Single use of user '$CONTEXT_USER', removing."
  kubectl config delete-user $CONTEXT_USER
fi

kubectl config delete-context $CONTEXT_NAME