From 1694340dfc0d2ba346eac60501dde4168ba10324 Mon Sep 17 00:00:00 2001
From: AndrewPaglusch <AndrewPaglusch@users.noreply.github.com>
Date: Fri, 17 Dec 2021 23:27:23 -0600
Subject: [PATCH] handle version upgrades; new handler handling

---
 handlers/main.yml    |  4 ++++
 tasks/lighthouse.yml |  2 +-
 tasks/nebula.yml     | 20 +++++++++++++++++++-
 tasks/node.yml       |  2 +-
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/handlers/main.yml b/handlers/main.yml
index 3d7da35..ea6d622 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -2,8 +2,12 @@
   systemd:
     name: nebula
     state: restarted
+  when: inventory_hostname not in groups['nebula_lighthouse']
+  listen: "restart nebula"
 
 - name: Restart Lighthouse
   systemd:
     name: lighthouse
     state: restarted
+  when: inventory_hostname in groups['nebula_lighthouse']
+  listen: "restart nebula"
diff --git a/tasks/lighthouse.yml b/tasks/lighthouse.yml
index ea00590..bf6738b 100644
--- a/tasks/lighthouse.yml
+++ b/tasks/lighthouse.yml
@@ -18,7 +18,7 @@
     owner: root
     group: root
     mode: '0400'
-  notify: Restart Lighthouse
+  notify: restart nebula
 
 - name: Ensure lighthouse service exists
   template:
diff --git a/tasks/nebula.yml b/tasks/nebula.yml
index 977a3c2..cb0368d 100644
--- a/tasks/nebula.yml
+++ b/tasks/nebula.yml
@@ -6,12 +6,30 @@
     owner: root
     group: root
 
+- name: Check for existing Nebula install
+  stat:
+    path: '/opt/nebula/nebula'
+  register: installed_nebula_stats
+
+- name: Get Nebula version (if installed)
+  command: "/opt/nebula/nebula -version"
+  register: installed_nebula_version_out
+  changed_when: False
+  failed_when: False
+  when: installed_nebula_stats.stat.exists
+
+- name: Extract Nebula version from command output
+  set_fact:
+    installed_nebula_version: "{{ installed_nebula_version_out.stdout.split(' ')[1] }}"
+  when: installed_nebula_stats.stat.exists
+
 - name: Download & Extract Nebula
   unarchive:
     src: "https://github.com/slackhq/nebula/releases/download/v{{ nebula_version }}/nebula-linux-{{ nebula_architectures[ansible_architecture] }}.tar.gz"
     dest: "/opt/nebula"
     remote_src: yes
-    creates: '/opt/nebula/nebula'
+  when: (installed_nebula_version|default(nebula_version) != nebula_version) or (not installed_nebula_stats.stat.exists)
+  notify: restart nebula
 
 - name: Ensure Nebula binaries permissions are correct
   file:
diff --git a/tasks/node.yml b/tasks/node.yml
index e4ed33b..f7e3eec 100644
--- a/tasks/node.yml
+++ b/tasks/node.yml
@@ -46,7 +46,7 @@
     owner: root
     group: root
     mode: '0400'
-  notify: Restart Nebula
+  notify: restart nebula
 
 - name: Ensure Nebula service exists
   template: