A simple molly-guard compatible script to request confirmation for rebooting a machine with active Plex sessions

15-confirm-plex.sh

#!/bin/sh
#
# 15-confirm-plex.sh - molly-guard script to request confirmation for rebooting
#                      a machine with active Plex sessions.
#
# To use it place the script in /etc/molly-guard/run.d/ and make it executable.
# Requires molly-guard, curl, jq:
#
#   sudo apt install molly-guard curl jq
#
# Copyright © 2023 Jan Willhaus <mail@janwillhaus.de>
# Released under the terms of the Apache License, Version 2.0
#
set -eu

# Import settings if running molly-guard context
if [ -n "${MOLLYGUARD_SETTINGS:-}" ] && [ -f "$MOLLYGUARD_SETTINGS" ]; then
  # shellcheck disable=SC1090
  . "$MOLLYGUARD_SETTINGS"
fi

if [ -n "${PLEX_NO_CONFIRM:-}" ]; then
  echo "I: molly-guard: No confirmation requested for Plex."
  exit 0
fi

PLEX_AUTH_TOKEN="${PLEX_AUTH_TOKEN:-'place plex token here or in /etc/molly-guard/rc'}"

nc -z 127.0.0.1 32400 || exit 0 # Check if plex is running
test -t 0 || exit 0             # Check if shell is interactive

confirm() {
  printf "Continue? [y/N]: "
  IFS= read -r input || :

  case $input in
  [yY][eE][sS] | [yY])
    return 0
    ;;
  *)
    return 1
    ;;
  esac
}

sigh() {
  echo "Good thing I asked; I won't $MOLLYGUARD_CMD …" >&2
  exit 1
}

trap 'echo;sigh' HUP INT QUIT USR1 USR2 TERM

PLEX_SESSIONS=$(curl -SsfL \
  --header "Accept: application/json" \
  --header "X-Plex-Token: $PLEX_AUTH_TOKEN" \
  'http://127.0.0.1:32400/status/sessions')
PLEX_ITEMS_PLAYING=$(echo "$PLEX_SESSIONS" | jq -r '.MediaContainer.size')

if [ "$PLEX_ITEMS_PLAYING" -eq 0 ]; then
  exit 0
fi

echo "W: molly-guard: Plex has ${PLEX_ITEMS_PLAYING} active session(s)!" >&2
confirm || sigh