#!/usr/bin/env bash
set -eox pipefail

VM_NAME="${VM_NAME:-k8s-kvm}"
VM_MEMORY="${VM_MEMORY:-4G}"
# hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport
HOSTFWD="${HOSTFWD:-hostfwd=tcp::2222-:22}"
DISK_IMG="${DISK_IMG:-./coreos_production_qemu_image.img}"
CD_ARG=""
MONITOR_OUTPUT="${MONITOR_OUTPUT:-unix:/tmp/kvm-mon}"

if [ -n "${CLOUD_CONFIG_FILE}" ]; then
  echo "Setting cloud config file: ${CLOUD_CONFIG_FILE}"
  mkdir -p "${PWD}/openstack/latest"
  cp "${CLOUD_CONFIG_FILE}" "${PWD}/openstack/latest/user_data"
  cat "${PWD}/openstack/latest/user_data"
  set -- \
      -fsdev local,id=conf,security_model=none,readonly,path="${PWD}" \
      -device virtio-9p-pci,fsdev=conf,mount_tag=config-2 "$@"
fi

if [ -n "${IGNITION_CONFIG_FILE}" ]; then
  echo "Setting ignition config file: ${IGNITION_CONFIG_FILE}"
  cat "${IGNITION_CONFIG_FILE}"
  set -- -fw_cfg name=opt/com.coreos/config,file="${IGNITION_CONFIG_FILE}" "$@"
fi

if [ -n "$CONFIG_FILE" ]; then
  echo "Transpiling config file: ${CONFIG_FILE}"
  cat "${CONFIG_FILE}"
  ./ct -in-file $CONFIG_FILE -out-file ${PWD}/ignition.json
  echo "Setting ignition config file ${PWD}/ignition.json"
  cat "${PWD}/ignition.json"
  set -- -fw_cfg name=opt/com.coreos/config,file="${PWD}/ignition.json" "$@"
fi

if [ -n "$CD_IMG" ]; then
  CD_ARG="-drive file=${CD_IMG},media=cdrom"
fi

# https://alpha.release.core-os.net/amd64-usr/current/coreos_production_qemu.sh
qemu-system-x86_64 \
  -name "${VM_NAME}" \
  -enable-kvm \
  -cpu host \
  -m "${VM_MEMORY}" \
  -device virtio-net,netdev=vmnic \
  -netdev user,id=vmnic,"${HOSTFWD}",hostname="${VM_NAME}" \
  -drive if=virtio,file="${DISK_IMG}" \
  ${CD_ARG} \
  -nographic \
  -machine accel=kvm \
  -vga std \
  -smp 2 \
  -monitor "${MONITOR_OUTPUT}" \
  $@