#!/usr/bin/env bash

UMBREL_ROOT="$(readlink -f $(dirname "${BASH_SOURCE[0]}")/../../..)"
block_device="${1}"
mount_point="${2}"

set_status="/status-server/set-status"
setup_iptables="/status-server/setup-iptables"

check_if_not_already_running() {
  if ps ax | grep $0 | grep -v $$ | grep bash | grep -v grep
  then
    echo "storage monitor is already running"
    exit 1
  fi
}

main () {
  check_if_not_already_running

  while true; do
    if ! [[ -e "/dev/${block_device}" ]]; then
      echo "Mounted block device no longer exists!"
      break
    fi

    if ! grep --quiet " ${mount_point} " /proc/mounts; then
      echo "External storage is no longer mounted!"
      break
    fi

    if grep " ${mount_point} " /proc/mounts | grep --quiet '[ ,]ro[ ,]'; then
      echo "External storage is mounted as read only!"
      break
    fi

    if ! df -h "${UMBREL_ROOT}" | grep --quiet "/dev/${block_device}"; then
      echo "Umbrel root is no longer bind mounted to external storage!"
      break
    fi

    sleep 1
  done

  echo "Stopping Umbrel due to failed storage device check..."
  docker kill $(docker ps -aq)
  $set_status mount errored monitor-check
  $setup_iptables --force
}

main