vigil/scripts/alert

#!/usr/bin/env bash

# Devices to check -- if populated and up, no notifications are sent.
readonly DEVICES=()
readonly RECIPIENT="${NOTIFICATION_RECIPIENT}"

check_devices() {
  for device in "${DEVICES[@]}"; do
    if ping -c 1 -w 1 "${device}" &> "/dev/null"; then
      return 0
    fi
  done

  return 255
}

main() {
  # If devices are present, don't notify.
  if (( "${#DEVICES[@]}" )); then
    if check_devices; then
      exit 0
    fi
  fi

  echo "${HOSTNAME}: motion detected at $(date '+%Y-%m-%dT%H:%M:%S%:z')." | \
    mutt -s "${HOSTNAME}: Motion Detected" \
	 -- "${RECIPIENT}"
}

main "$@"