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

roles/usb_lib/tasks/install.yml

@@ -7,6 +7,12 @@
 # https://github.com/rbrito/usbmount/blob/master/README.md (2018-08-10)
 # https://github.com/rbrito/usbmount/blob/master/usbmount.conf (2010-04-25)
 
+
+- name: Record (initial) available disk space
+  shell: df -PB1 $(findmnt / -o SOURCE -n) | awk 'NR==2 {print $4}'
+  register: df1
+
+
 - name: Does systemd-udevd.service exist
   stat:
     path: "{{ systemd_location }}/systemd-udevd.service"
@@ -87,6 +93,17 @@
 
 # RECORD 'USB_LIB' AS INSTALLED
 
+- name: Record (final) available disk space
+  shell: df -PB1 $(findmnt / -o SOURCE -n) | awk 'NR==2 {print $4}'
+  register: df2
+
+- name: Add 'usb_lib_disk_usage = {{ df1.stdout|int - df2.stdout|int }}' to {{ iiab_ini_file }}
+  ini_file:
+    path: "{{ iiab_ini_file }}"    # /etc/iiab/iiab.ini
+    section: usb_lib
+    option: usb_lib_disk_usage
+    value: "{{ df1.stdout|int - df2.stdout|int }}"
+
 - name: "Set 'usb_lib_installed: True'"
   set_fact:
     usb_lib_installed: True