automatic backup disk on/off

roles/_handlers/handlers/main.yaml

@@ -0,0 +1,12 @@
+- name: reload systemd
+  command: systemctl daemon-reload
+  
+  
+- name: Restart NGINX
+  service:
+    name: nginx
+    state: restarted
+    
+    
+- name: Run APT update
+  command: apt update -y

roles/backup_server/files/backup-disk-off.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description="Check Backup mounts and turn Disk off if apropriate"
+
+[Timer]
+OnCalendar=*:0/15
+Unit=backup-disk-onoff@off.service
+
+[Install]
+WantedBy=network.target

roles/backup_server/files/backup-disk-onoff.py

@@ -1,5 +1,24 @@
+#!/usr/bin/env python3
 import subprocess
 import json
+import sys
+import paho.mqtt.client as mqtt
+import time
+
+def send_mqtt_message(topic, payload):
+    client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)  # Use the latest API version
+    client.connect("mqtt.chaos", 1883, 60)
+    client.publish(topic, payload)
+    client.disconnect()
+
+def get_args(name='default', first='on'):
+    return first
+
+mode = get_args(*sys.argv)
+print(f"Mode is: {mode}")
+if mode not in ["on", "off"]:
+    print("Error: mode must be either 'on' or 'off'")
+    sys.exit(1)
 
 # Run the systemctl command and capture the output
 try:
@@ -21,7 +40,7 @@ except json.JSONDecodeError as e:
     print(f"Error parsing JSON: {e}")
     exit(1)
 
-# Filter units that are loaded, active, and sub: running
+# Filter units that are loaded, active, and sub: running, and start with 'backup-'
 running_units = []
 for unit in units:
     if (
@@ -36,3 +55,46 @@ for unit in units:
 print("Units with load: loaded, active: active, sub: running:")
 for unit in running_units:
     print(f"  - {unit['unit']}: {unit['description']}")
+
+# Send MQTT message based on mode
+if mode == "on" or (mode == "off" and running_units):
+    # Send ON MQTT message
+    print(f"Turning backup Disk ON")
+    send_mqtt_message("switch_backup/switch/switch_backup_power/command", "on")
+    time.sleep(15)
+    # ON case: Send ON message after waiting 5 seconds and running vgchange -ay backup if needed
+    if mode == "on":
+        # Check if 'backup' VG is active
+        try:
+            result = subprocess.run(
+                ["vgdisplay", "-cA"],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+                text=True,
+                check=True
+            )
+            vgdisplay_output = result.stdout.strip().split("\n")
+            print(f"vgdisplay: {vgdisplay_output}")
+            backup_present = any(line.split(":")[0].strip() == "backup" for line in vgdisplay_output)
+            print(f"backup VG active? {backup_present}")
+            if not backup_present:
+                try:
+                    print(f"Activating VG backup")
+                    subprocess.run(["vgchange", "-ay", "backup"], check=True)
+                except subprocess.CalledProcessError as e:
+                    print(f"Error executing vgchange: {e.stderr}")
+                    exit(1)
+        except subprocess.CalledProcessError as e:
+            print(f"Error executing vgdisplay: {e.stderr}")
+            exit(1)
+else:
+    # OFF case: Only execute if nothing is mounted
+    if not running_units:
+        print(f"Turning backup Disk OFF")
+        subprocess.run(["sync"], check=True)
+        try:
+            subprocess.run(["vgchange", "-an", "backup"], check=True)
+        except subprocess.CalledProcessError as e:
+            print(f"Error executing vgchange: {e.stderr}")
+            exit(1)
+        send_mqtt_message("switch_backup/switch/switch_backup_power/command", "off")

roles/backup_server/files/backup-disk-onoff@.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Backup Disk %I
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/backup-disk-onoff.py %I
+RemainAfterExit=yes
+
+[Install]
+WantedBy=timers.target

roles/backup_server/meta/main.yaml

@@ -0,0 +1,2 @@
+dependencies:
+  - _handlers

roles/backup_server/tasks/main.yaml

@@ -1,3 +1,9 @@
+- name: Additional packages
+  apt:
+   state: present
+   name:
+    - python3-paho-mqtt
+
 
 - name: Generate Automounts
   include_role: 
@@ -12,7 +18,8 @@
             Type: btrfs
             Options: defaults,compress=lzo,space_cache=v2
           Unit:
-            After: network.target
+            After: network.target backup-disk-onoff@on.service
+            Requires: backup-disk-onoff@on.service
           Install:
             WantedBy: network.target
     catena_automount:
@@ -35,28 +42,33 @@
     loop_var: mount_point
 
 
-
+- name: BackupDisk On/Off service
-# [Unit]
+  block:
-# Description=Automount /backup/yori
+    - name: Copy Script
-# After=network.target
+      copy:
-
+        src: backup-disk-onoff.py
-# [Automount]
+        dest: /usr/local/bin/backup-disk-onoff.py
-# Where=/backup/yori
+        mode: 0755
-# TimeoutIdleSec=30
+        owner: root
-
+        group: root
-# [Install]
+    - name: Install Unit file
-# WantedBy=network.target
+      notify: reload systemd
-# [Unit]
+      copy:
-# Description=Mount /backup/yori
+        src: backup-disk-onoff@.service
-# After=network.target
+        dest: /etc/systemd/system/backup-disk-onoff@.service
-# #Requires=backup-yori.automount
+        owner: root
-# #After=backup-yori.automount
+        group: root
-
+    - name: Create a timer to turn OFF the Disk
-# [Mount]
+      notify: reload systemd
-# What=/dev/backup/yori
+      copy:
-# Where=/backup/yori
+        src: backup-disk-off.timer
-# Type=btrfs
+        dest: /etc/systemd/system/backup-disk-off.timer
-# Options=defaults,compress=lzo,space_cache=v2
+        owner: root
-
+        group: root
-# [Install]
+    - name: Enable timer and start it
-# WantedBy=network.target
+      ansible.builtin.systemd_service:
+        name: backup-disk-off.timer
+        enabled: true
+        state: started
+  
+