#!/bin/bash

sudo apt-get install jq --assume-yes

# get namespace
PROXY_NS=$(kubectl get pods --all-namespaces --show-all --output=json | jq -r '.items[] | select(.metadata.name | contains("hsc-proxy")) | .metadata.namespace ' )
# get pod name
PROXY_POD=$(kubectl get pods --all-namespaces --show-all --output=json | jq -r '.items[] | select(.metadata.name | contains("hsc-proxy")) | .metadata.name ' )

echo Current state of /etc/resolv.conf on $PROXY_NS/$PROXY_POD
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- cat /etc/resolv.conf

echo Creating backup of resolv.conf to resolv.save
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- cp /etc/resolv.conf /etc/resolv.save

echo Creating working copy named resolv.new
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- cp /etc/resolv.conf /etc/resolv.new >/dev/null 2>&1

echo Updating working copy
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- perl -pi -e 's/^options ndots:5//g' /etc/resolv.new >/dev/null 2>&1

echo Replace resolve.conf with working copy resolve.new
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- cp /etc/resolv.new /etc/resolv.conf >/dev/null 2>&1

echo New state of /etc/resolv.conf on $PROXY_NS/$PROXY_POD
kubectl exec $PROXY_POD --namespace=$PROXY_NS -i -t -- cat /etc/resolv.conf