#!/usr/bin/env bash
set -eu
cmd="$1"
shift
container_name=lkmc
target_dir=/root/linux-kernel-module-cheat
if [ "$cmd" = create ]; then
  # --privileged for KVM:
  # https://stackoverflow.com/questions/48422001/launching-qemu-kvm-from-inside-docker-container
  sudo docker create --name "$container_name" --net host -i --privileged -t -w "${target_dir}" -v "$(pwd):${target_dir}" ubuntu:18.04 bash
elif [ "$cmd" = start ]; then
  sudo docker start "$container_name"
elif [ "$cmd" = stop ]; then
  sudo docker stop "$container_name"
elif [ "$cmd" = sh ]; then
  if [ "$#" -gt 0 ]; then
    c=-c
  fi
  # https://stackoverflow.com/questions/39794509/how-to-open-multiple-terminals-in-docker
  sudo docker exec -it "$container_name" bash $c "$*"
elif [ "$cmd" = DESTROY ]; then
  sudo docker rm "$container_name"
else
  echo "error: unknown action: ${cmd}" 1>&2
  exit 2
fi