#!/usr/bin/env bash
set -e

# CLI handling.
nographic=false
while getopts n OPT; do
  case "$OPT" in
    n)
      nographic=true
      ;;
  esac
done
if $nographic; then
  extra_append='console=ttyS0'
  extra_flags='-nographic'
else
  extra_append=''
  extra_flags=''
fi

# Work.
cd buildroot
make BR2_EXTERNAL="$(pwd)/../kernel_module" qemu_x86_64_defconfig
cat ../buildroot_config_fragment >> .config
env -u LD_LIBRARY_PATH make BR2_JLEVEL="$(($(nproc) - 2))" kernel_module-rebuild all
qemu-system-x86_64 \
  -M pc \
  -append "root=/dev/vda $extra_append" \
  -drive file=output/images/rootfs.ext2,if=virtio,format=raw \
  -kernel output/images/bzImage \
  -m 128M \
  -net nic,model=virtio \
  -net user \
  -smp 1 \
  $extra_flags \
;