kubectl-switch_config

#!/usr/bin/env sh
#kubectl-switch-config - plugin for kubectl to easy switch between configuration files, using symbolic links
#Author: Radoslaw Warowny
#License: GPL (General Public License) version 3

getopts hl opt

if [ "$opt" = "h" ]; then
  echo Usage:
  echo "\t kubectl switch-config [-h] [-l] | [<name>]"
  echo
  echo 'Notice: You shoud have created configuration file in your $HOME/.kube directory named: config-name before first use.'
  echo
  echo 'Options:'
  echo '  -h  show (this) help'
  echo '  -l  list available configuration names possible for switching'
  echo
  echo 'Invoking with no arguments shows current (lately selected) configuration'
  exit
fi

if [ "$opt" = "l" ]; then
  cd ~/.kube && ls -1 config-* | sed 's/^config-//'
  exit
fi

config=$1

if [ "$config" = "" ]; then
  if [ -h $HOME/.kube/config ]; then
	  ls -l $HOME/.kube/config | sed 's/.*config-//'
  else
    if [ -f $HOME/.kube/config ]; then
      echo "ERROR: Configuration file \$HOME/.kube/config exists but it's not symbolic link"
      echo "Notice: If it's your first time, backup or move your current $HOME/.kube/config file"
      echo "to $HOME/.kube/config-somename. Than you can use it by: kubectl switch-config somename"
    else
      echo "ERROR: \$HOME/.kube/config symbolic link desn't exit."
      echo "Notice: If it's your first time, create \$HOME/.kube/config-somename file and invoke:"
      echo "kubectl switch-config somename"
    fi
    exit 1
  fi
	exit
fi

file=config-$config
if ! cd $HOME/.kube; then
  echo "ERROR: Directory $HOME/.kube is not accessable"
fi
  
if [ -f $file ]; then
  cd $HOME/.kube
  ln -sf config-$config config
else
  echo "ERROR: Configuration file $file doesn't exist in your \$HOME/.kube directory. Configuration has NOT been switched."
  exit 1
fi