Record approx disk usage for 45 roles (to iiab.ini)

roles/nodejs/tasks/install.yml

@@ -1,3 +1,12 @@
+# Lokole PDF (User's Guide) gets copied for offline use (http://box/info) here:
+# https://github.com/iiab/iiab/blob/master/roles/www_base/templates/iiab-refresh-wiki-docs.sh#L51-L52
+
+
+- name: Record (initial) available disk space
+  shell: df -PB1 $(findmnt / -o SOURCE -n) | awk 'NR==2 {print $4}'
+  register: df1
+
+
 # 1. TEST IF Node.js ALEADY INSTALLED & IF SO WARN IT'LL BE REPLACED
 
 # 2019-02-03: BELOW TESTS IF 'nodejs' VERSION IS ALREADY INSTALLED:
@@ -161,6 +170,17 @@
 
 # 3. RECORD Node.js AS INSTALLED
 
+- name: Record (final) available disk space
+  shell: df -PB1 $(findmnt / -o SOURCE -n) | awk 'NR==2 {print $4}'
+  register: df2
+
+- name: Add 'nodejs_disk_usage = {{ df1.stdout|int - df2.stdout|int }}' to {{ iiab_ini_file }}
+  ini_file:
+    path: "{{ iiab_ini_file }}"    # /etc/iiab/iiab.ini
+    section: nodejs
+    option: nodejs_disk_usage
+    value: "{{ df1.stdout|int - df2.stdout|int }}"
+
 - name: "Set 'nodejs_installed: True'"
   set_fact:
     nodejs_installed: True