fix: Validate status messages (#924)

#!/usr/bin/env bash

set -Eeuo pipefail

lastmsg=""

path="/run/shm/msg.html"

if [ -f "$path" ] && [ -s "$path" ]; then

  echo -n "s: " && cat "$path"

fi

refresh() {

  [ ! -f "$path" ] && return 0

  [ ! -s "$path" ] && return 0

  msg=$(< "$path")

  msg="${msg%$'\n'}"

  [ -z "$msg" ] && return 0

  [[ "$msg" == "$lastmsg" ]] && return 0

  lastmsg="$msg"

  echo "s: $msg"

  return 0

}

refresh

inotifywait -m "$path" |

  while read -r fp event fn; do

    case "${event,,}" in

      "modify"* ) echo -n "s: " && cat "$path" ;;

      "modify"* ) refresh ;;

      "delete_self" ) echo "c: vnc" ;;

    esac    

  done