#!/bin/bash

set -o nounset
set -o errexit

function usage() {
  cat <<EOF
Usage: 
  $0 start <kubeasz_ver>    To start a kubeasz(tagged) container
  $0 clean                  To stop and remove all running containers

EOF
} 

function start_kubeasz_docker() {
  # kubeasz docker version
  KUBEASZ_DOCKER_VER=jmgao1983/kubeasz:$1
  echo "[INFO] VERSION $KUBEASZ_DOCKER_VER"
  
  # init host dir
  if [ -d "/etc/ansible/roles/" ];then
    echo "[WARN] aleady Initialized."
  else
    rm -rf /etc/ansible
    echo "[INFO] run a temporary container"
    docker run -d --name temp_easz $KUBEASZ_DOCKER_VER
    echo "[INFO] init host kubeasz directory"
    docker cp temp_easz:/etc/ansible /etc/ansible
    echo "[INFO] stop&remove temporary container"
    docker stop temp_easz
    docker rm temp_easz
  fi
  
  # get host's IP
  host_if=$(ip route|grep default|cut -d' ' -f5)
  host_ip=$(ip a|grep $host_if|awk 'NR==2{print $2}'|cut -d'/' -f1)
  echo "[INFO] get host IP: $host_ip"
  
  # run kubeasz docker container
  echo "[INFO] run kubeasz in a container"
  docker run --detach \
      --name kubeasz \
      --restart always \
      --env HOST_IP=$host_ip \
      --volume /etc/ansible:/etc/ansible \
      --volume /root/.kube:/root/.kube \
      --volume /root/.ssh/id_rsa:/root/.ssh/id_rsa:ro \
      --volume /root/.ssh/id_rsa.pub:/root/.ssh/id_rsa.pub:ro \
      --volume /root/.ssh/known_hosts:/root/.ssh/known_hosts:ro \
      $KUBEASZ_DOCKER_VER
}

function clean_container() {
 echo "[INFO] clean all running containers"
 docker ps -a|awk 'NR>1{print $1}'|xargs docker rm -f 
} 

[ "$#" -gt 0 ] || { usage >&2; exit 2; }

case "$1" in

    (start)
        [ "$#" -gt 1 ] || { usage >&2; exit 2; } 
        start_kubeasz_docker $2
        ;;
    (clean)
        clean_container
        ;;
    (*)
        usage
        exit 0
        ;;
esac