each major role change can be recorded in upgrade_roles with a bump in iiab_revision to denote the addition

Author: jvonau

roles/9-local-addons/tasks/main.yml

@@ -30,6 +30,12 @@
     name: calibre-web
   when: calibreweb_install | bool
 
+- name: Record IIAB_REVISION
+  lineinfile:
+    path: "{{ iiab_env_file }}"
+    regexp: '^IIAB_REVISION=*'
+    line: 'IIAB_REVISION={{ iiab_revision }}'
+
 - name: Recording STAGE 9 HAS COMPLETED ====================
   lineinfile:
     path: "{{ iiab_env_file }}"

vars/default_vars.yml

@@ -14,7 +14,7 @@
 
 # IIAB (PRE-)release version number, for {{ iiab_env_file }}
 iiab_base_ver: 7.2
-iiab_revision: 0
+iiab_revision: 1
 
 iiab_etc_path: /etc/iiab