merge kube config files tool to work with multiple k8s env

merge-kubeconfig

#!/bin/bash

# Usage: merge-kubeconfig [-h] [-r] [file1] [file2] [...] [file n]
# Options:
#   -h, --help   Show help
#   -r, --reset  override(replace) the current config rather than merge with it
#  
# Eg:
#  
#   1) Append
#  
#       merge-kubeconfig ~/.kube/k3s-fi.conf aws-k8s.config.yaml
#  
#       would append k3s-fi and aws-k8s config into current config, stored at ~/.kube/config
#  
#   2) Replace
#  
#       merge-kubeconfig -r ~/.kube/k3s-fi.conf aws-k8s.config.yaml
#  
#     would empty the current config, then store k3s-fi and aws-k8s config into current config, stored at ~/.kube/config


# Initialize variables to store option values
show_help=0
do_reset=0

# Check the first argument
if [ $# -ge 1 ]; then
  if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
    show_help=1
    shift
  elif [ "$1" == "-r" ] || [ "$1" == "--reset" ]; then
    do_reset=1
    shift
  fi
fi


if [ "$show_help" -eq 1 ]; then
  echo "Usage: merge-kubeconfig [-h] [-r] [file1] [file2] [...] [file n]"
   echo "Options:"
  echo "  -h, --help   Show help"
  echo "  -r, --reset  override(replace) the current config rather than merge with it"
  echo ""
  echo "Eg:"
  echo ""
  echo "  1) Append"
  echo "      "
  echo "      merge-kubeconfig ~/.kube/k3s-fi.conf aws-k8s.conf"
  echo "      "
  echo "      would append k3s-fi and aws-k8s config into current config, stored at ~/.kube/config"
  echo " "
  echo "  2) Replace"
  echo ""
  echo "      merge-kubeconfig -r ~/.kube/k3s-fi.conf aws-k8s.conf"
  echo ""
  echo "    would empty the current config, then store k3s-fi and aws-k8s config into current config, stored at ~/.kube/config"

  exit 0
fi


KUBECONFIG=""
for arg in "$@"; do
  KUBECONFIG="${KUBECONFIG}:${arg}"
done
# Remove the fisrt `:` char 
KUBECONFIG="${KUBECONFIG#:}"
if [ "$do_reset" -ne 1 ]; then
  KUBECONFIG=~/.kube/config:$KUBECONFIG
fi

echo "---"
echo "KUBECONFIG=$KUBECONFIG"
echo "---"

export KUBECONFIG
kubectl config view --flatten > all-in-one-kubeconfig.yaml
mv all-in-one-kubeconfig.yaml ~/.kube/config

if [ "$do_reset" -eq 1 ]; then
  echo "OK: replace current config with $@"
  exit 0
else
  echo "OK: merged current config with $@"
  exit 0
fi