#!/bin/bash
# 1.3.0
# Script creates QEMU disk VMware HDD and runs QEMU VM with VyOS Installation ISO attached to CDROM

qemu_disk='vyos-1.3.0-amd64.vmdk'
binary_list=('free' 'awk' 'qemu-img' 'qemu-system-x86_64' 'kvm')
image_size='2G'
image_port='3355'
vyos_iso="$1"

function check_iso {
 [ -z "$vyos_iso" ] && echo -e "\nEnter name of VyOS installation ISO, exiting\n" && exit 1 
 [ ! -s "$vyos_iso" ] && echo "File '$vyos_iso' doesn't exist or it is zero, exiting" && exit 1
}

function check_binaries {
 for binary in "${binary_list[@]}"; do
   type -P "$binary" 1>/dev/null
   [ "$?" != 0 ] && echo -e "\n'$binary' required but not found, exiting!\n" && exit 1
 done
}

function check_ram {
 free_ram="$(free -m | grep Mem | awk '{print $4}')"
 free_ram_use=$(("free_ram" - 1000))
}

function start_image {
 qemu-img create -f vmdk "$qemu_disk" "$image_size"
 [[ $(qemu-system-x86_64 -boot c -cdrom "$vyos_iso" -hda "$qemu_disk" -m "$free_ram_use" -enable-kvm -serial telnet:127.0.0.1:"$image_port",server,nowait 2>/dev/null &) ]] && echo "Qemu succesfully started" || echo "Qemu can't be started, exiting"; exit
}

check_iso
check_binaries
check_ram
start_image

exit 0