Clean tasks/main.yml in stages 1, 3, 4, 6

roles/1-prep/tasks/main.yml

@@ -78,12 +78,12 @@
 - name: SSHD
   include_role:
     name: sshd
-  # has no "when: XXXXX_install" flag
+  #when: sshd_install | bool    # Flag might be created in future?
 
 - name: IIAB-ADMIN
   include_role:
     name: iiab-admin
-  # has no "when: XXXXX_install" flag
+  #when: iiab-admin_install | bool    # Flag might be created in future?
 
 - name: OPENVPN
   include_role:

roles/3-base-server/tasks/main.yml

@@ -27,6 +27,7 @@
 - name: WWW_BASE (WWW_OPTIONS should be installed later)
   include_role:
     name: www_base
+  #when: www_base_install | bool    # Flag might be created in future?
 
 - name: Recording STAGE 3 HAS COMPLETED =====================
   lineinfile:

roles/4-server-options/tasks/main.yml

@@ -1,19 +1,25 @@
 # Server Options
 
 - name: ...IS BEGINNING ==================================
-  file:
-    path: "{{ iiab_state_file }}"
-    state: touch
+  stat:
+    path: "{{ iiab_state_file }}"    # /etc/iiab/iiab_state.yml
+  register: iiab_state_file_check
 
-- name: Install IIAB's python libs
+# STRICT CHECK in case {iiab-stages.yml, run-one-role.yml, etc} omit this:
+- name: ENFORCE precondition that {{ iiab_state_file }} MUST exist
+  assert:
+    that: iiab_state_file_check.stat.exists
+
+- name: Install pylibs (IIAB's python libs)
   include_role:
     name: pylibs
+  #when: pylibs_install | bool    # Flag might be created in future?
 
 - name: Install named / BIND
   include_tasks: roles/network/tasks/named.yml
   when: named_install | bool
 
-- name: Installing dhcpd
+- name: Install dhcpd
   include_tasks: roles/network/tasks/dhcpd.yml
   when: dhcpd_install | bool
 
@@ -24,7 +30,7 @@
 - name: Install Bluetooth - only on Raspberry Pi
   include_role:
     name: bluetooth
-  when: rpi_model != "none" and bluetooth_install
+  when: bluetooth_install and rpi_model != "none"
 
 - name: USB_LIB
   include_role:
@@ -48,8 +54,7 @@
 - name: WWW_OPTIONS (WWW_BASE should have been installed earlier)
   include_role:
     name: www_options
-  #when: www_options_install | bool
-  #when: apache_install or nginx_install
+  #when: www_options_install | bool    # Flag might be created in future?
 
 - name: Recording STAGE 4 HAS COMPLETED ==================
   lineinfile:

roles/6-generic-apps/tasks/main.yml

@@ -3,10 +3,11 @@
 - name: ...IS BEGINNING ====================================
   command: echo
 
+# UNMAINTAINED
 - name: AZURACAST
   include_role:
     name: azuracast
-  when: azuracast_install | bool
+  when: azuracast_install is defined and azuracast_install
 
 # UNMAINTAINED
 - name: DOKUWIKI