Append item to custom_env_files of undercloud.conf

Append item to custom_env_files if it's already present in
undercloud.conf
Insert custom_env_files when undercloud.conf doesn't have it

Closes-Bug: 1981081
Change-Id: I0d62ad4e10e1dbb2a6019815fc133237f6ee40fe

tasks/common/skip_rhel_enforcement.yaml

@@ -1,16 +1,39 @@
 ---
-- name: Create the entry in undercloud.conf
-  ini_file:
+- name: Check undercloud.conf exists
+  stat:
     path: "{{ working_dir }}/undercloud.conf"
-    section: DEFAULT
-    option: custom_env_files
-    value: "{{ working_dir }}/skip_rhel_release.yaml"
-
-- name: Create the heat parameter file for undercloud.
-  vars:
-    skip_rhel:
-      parameter_defaults:
-        SkipRhelEnforcement: true
-  copy:
-    content: "{{ skip_rhel | to_nice_yaml }}"
-    dest: "{{ working_dir }}/skip_rhel_release.yaml"
+  register: under_conf_exist
+- block:
+    - name: "Retrieve remote ini file"
+      fetch:
+        src: "{{ working_dir }}/undercloud.conf"
+        dest: '/tmp/'
+        flat: true
+    - name: Read current custom_env_files files
+      set_fact:
+        current_custom_env: "{{ lookup( 'ini', 'custom_env_files section=DEFAULT file=/tmp/undercloud.conf') }}"
+    - name: Append skip_rhel_release.yaml to custom_env_files
+      ini_file:
+        path: "{{ working_dir }}/undercloud.conf"
+        section: DEFAULT
+        option: custom_env_files
+        value: "{{ current_custom_env.split(',')| union([working_dir+'/skip_rhel_release.yaml'])|map('trim')|unique|join(',')}}"
+        backup: true
+      when: current_custom_env | default([]) | length > 0
+    - name: Insert custom_env_files
+      ini_file:
+        path: "{{ working_dir }}/undercloud.conf"
+        section: DEFAULT
+        option: custom_env_files
+        value: "{{ working_dir }}/skip_rhel_release.yaml"
+        backup: true
+      when: current_custom_env | default([]) | length == 0
+    - name: Create the heat parameter file for undercloud.
+      vars:
+        skip_rhel:
+          parameter_defaults:
+            SkipRhelEnforcement: true
+      copy:
+        content: "{{ skip_rhel | to_nice_yaml }}"
+        dest: "{{ working_dir }}/skip_rhel_release.yaml"
+  when: under_conf_exist.stat.exists