A simple shell-script that will allow you to power down/up your NAS in tandem with Plex, to prevent Plex from wiping the library when the files are absent (NAS offline)

nas-control.sh

#!/bin/bash

# Configuration
NAS_HOSTNAME="your_nas_hostname"   # Replace with your NAS hostname
NAS_MAC="XX:XX:XX:XX:XX:XX"        # Replace with your NAS MAC address
NAS_USER="your_username"           # Replace with your SSH username
PLEX_CONTAINER="plex-linuxserver"  # Replace with your Plex container name

# Function to check if NAS is responding
check_nas_available() {
    local max_attempts=30
    local attempt=1

    while [ $attempt -le $max_attempts ]; do
        if ssh -q -o BatchMode=yes -o ConnectTimeout=2 "${NAS_USER}@${NAS_HOSTNAME}" "exit" 2>/dev/null; then
            echo -e "\r\033[K"  # Clear the line
            return 0
        fi
        echo -ne "\r\033[KWaiting for NAS to respond... (attempt $attempt/$max_attempts)"
        sleep 10
        ((attempt++))
    done

    echo -e "\r\033[K"  # Clear the line
    echo "Timeout waiting for NAS to respond"
    return 1
}

# Function to check system status
system_status() {
    echo "=== System Status ==="

    # Check NAS status
    echo -n "NAS Status: "
    if ssh -q -o BatchMode=yes -o ConnectTimeout=2 "${NAS_USER}@${NAS_HOSTNAME}" "exit" 2>/dev/null; then
        echo "ONLINE"
        # Get NAS uptime
        echo -n "NAS Uptime: "
        ssh "${NAS_USER}@${NAS_HOSTNAME}" "uptime"
    else
        echo "OFFLINE"
    fi

    # Check Plex container status
    echo -n "Plex Status: "
    if docker ps | grep -q "${PLEX_CONTAINER}"; then
        echo "RUNNING"
        # Get container uptime and version
        echo "Plex Container Info:"
        docker ps --format "Started: {{.RunningFor}}\nImage: {{.Image}}" -f name="${PLEX_CONTAINER}"
    else
        echo "STOPPED"
    fi
}

# Function to bring system down
system_down() {
    # Check if Plex container is running
    if docker ps | grep -q "${PLEX_CONTAINER}"; then
        echo "Stopping Plex container..."
        docker stop "${PLEX_CONTAINER}"
    else
        echo "Plex container is already stopped"
    fi

    # Check if NAS is responding before trying to shut it down
    if ssh -q -o BatchMode=yes -o ConnectTimeout=2 "${NAS_USER}@${NAS_HOSTNAME}" "exit" 2>/dev/null; then
        echo "Shutting down NAS..."
        ssh -t "${NAS_USER}@${NAS_HOSTNAME}" "sudo poweroff"
    else
        echo "NAS appears to be already offline"
    fi
}

# Function to bring system up
system_up() {
    # Check if NAS is already responding
    if ssh -q -o BatchMode=yes -o ConnectTimeout=2 "${NAS_USER}@${NAS_HOSTNAME}" "exit" 2>/dev/null; then
        echo "NAS is already online"
    else
        echo "Sending WOL packet to NAS..."
        wakeonlan "$NAS_MAC"

        echo "Waiting for NAS to boot..."
        if ! check_nas_available; then
            echo "Failed to connect to NAS"
            exit 1
        fi

        echo "NAS is up, remounting filesystems..."
        sudo mount -a
    fi

    # Check if Plex container is already running
    if docker ps | grep -q "${PLEX_CONTAINER}"; then
        echo "Plex container is already running"
    else
        echo "Starting Plex container..."
        docker start "${PLEX_CONTAINER}"
    fi
}

# Main script
case "$1" in
    "up")
        # Run in background with nohup if not already running in nohup
        if [ -z "$NOHUP_RUNNING" ]; then
            export NOHUP_RUNNING=1
            nohup "$0" up &
            exit 0
        fi
        system_up
        ;;
    "down")
        system_down
        ;;
    "status")
        system_status
        ;;
    *)
        echo "Usage: $0 {up|down|status}"
        echo "  up     - Start NAS and services (runs in background)"
        echo "  down   - Stop services and shutdown NAS"
        echo "  status - Show system status"
        exit 1
        ;;
esac