#!/bin/bash

usage() {
        cat <<EOF
$1 [-h|--help] [-u|--username user] [-p|--password pass] [-k|--key key] [-i|--ip ip] hostname
EOF
        return 0
}

# get 'new' ip from the last entry in /etc/lxc/hosts.conf
get_new_ip() {
        last=$(tail -n 1 /etc/lxc/hosts.conf | cut -d',' -f2)
        if [ -z "$last" ]; then
                echo "192.168.2.2"
                return 0
        fi
        fourth=$(echo $last | cut -d'.' -f4-)
        ((fourth++))
        added="$(echo $last | cut -d'.' -f-3).$fourth"
        echo $added
}

# defaults
username="cnuser"
password="cnuser"
key=""
ip=$(get_new_ip)

# getopt for cli options
options=$(getopt -o h,u:p:k:i -l help,username:,password:,key:,ip:, -- "$@")
while true
do
        case "$1" in
                -h|--help)     usage $0 && exit 0;;
                -u|--username) username=$2; shift 2;;
                -p|--password) password=$2; shift 2;;
                -k|--key)      key=$2; shift 2;;
                -i|--ip)       ip=$2; shift 2;;
                --)            shift 1; break;;
                *)             break;;
        esac
done

# check for hostname pos arg
if [ -z "$1" ]; then
        usage $0 && exit 1
fi

# create new container with values
lxc-create -t ubuntu --username $username --password $password --auth-key $key -B zfs --zfsroot zfs/root/thing

# add new IP for container, restart lxc-net
echo "$hostname,$ip" >> /etc/lxc/hosts.conf
systemctl restart lxc-net

# ask to start container
read -p "Start container and connect? [y/n]: " -n 1 -r
if [[ $REPLY =~ ^[Yy]$ ]]; then
        lxc-start -n $hostname
        ssh -i $key $username@$ip
        exit 1
fi