#!/bin/bash

#author:  Thomas Roehm
#version: 1.3

echo "You´re running version:"
echo ""
su - kubernetes -c "kubectl version"
echo ""
read -s -n 1 -p \"'Press any key to continue . . .'\"

apt-get update
apt-cache policy kubeadm  | head -n 30

echo ""
read -p "Please enter k8s version you want to patch to (e. g. \"1.16.2-00\"): " VERSION
echo "Version: \"$VERSION\" will be updated!"
echo ""

apt-mark unhold kubernetes-cni kubeadm kubelet kubectl docker-ce containerd.io
apt-get update && apt-get install -y kubeadm=${VERSION}

echo ""
#echo "drain node $(hostname -s)"
#su - kubernetes -c "kubectl drain $(hostname -s) --ignore-daemonsets"
echo ""

APPLYVERSION="v$(echo ${VERSION} | cut -d "-" -f1)"
echo ""
echo "version $APPLYVERSION will be applied"
echo ""
read -s -n 1 -p \"'Press any key to continue . . .'\"
kubeadm upgrade plan
echo ""
read -s -n 1 -p \"'Press any key to continue . . .'\"
kubeadm upgrade apply ${APPLYVERSION}

#apt-cache policy docker-ce
#echo ""
#read -p "Please enter docker-ce-version you want to patch to (e. g. \"5:18.09.9~3-0~ubuntu-xenial"): " DVERSION
#echo "Version: \"$iDVERSION\" will be updated!"
#echo ""
#apt-get install -y docker-ce
echo ""
#echo "uncordon node $(hostname -s)"
echo ""
#su - kubernetes -c "kubectl uncordon $(hostname -s)"
echo "patching kublet,kubectl"
echo ""
read -p "Do you want to proceed? Please enter y or n: " PROCEED
echo ""
echo "You´ve entered:  \"${PROCEED}\""
echo ""
if [ ${PROCEED} = "y" ]
then
        apt-get install -y kubelet=${VERSION} kubectl=${VERSION}
        apt-mark hold kubeadm kubernetes-cni kubelet kubectl docker-ce containerd.io
        systemctl restart docker.service kubelet.service
        systemctl status docker.service kubelet.service | cat
else
        exit 1
fi