Fix postgresql_lang integration test for CentOS 8 (#64872)

* Only search inside the role for files to include
When a role is called as a dependency, both roles are searched. This can cause the incorrect file to be included if it is picked up from the parent role.

test/integration/targets/postgresql_lang/tasks/main.yml

@@ -1,7 +1,20 @@
-# Initial CI tests of postgresql_lang module
-- import_tasks: postgresql_lang_initial.yml
-  when: ansible_distribution == 'CentOS'
+- name: Include distribution specific variables
+  include_vars: "{{ lookup('first_found', params) }}"
+  vars:
+    params:
+      files:
+        - "{{ ansible_facts.distribution }}-{{ ansible_facts.distribution_major_version }}.yml"
+        - default.yml
+      paths:
+        - vars
 
-# CI tests of owner param
-- import_tasks: postgresql_lang_add_owner_param.yml
-  when: ansible_distribution == 'CentOS'
+# Only run on CentOS 7 because there is a stack trace on CentOS 8 because the module
+# is looking for the incorrect version of plpython.
+# https://gist.github.com/samdoran/8fc1b4ae834d3e66d1895d087419b8d8
+- name: Initial CI tests of postgresql_lang module
+  when:
+    - ansible_facts.distribution == 'CentOS'
+    - ansible_facts.distribution_major_version is version ('7', '==')
+  block:
+    - include_tasks: postgresql_lang_initial.yml
+    - include_tasks: postgresql_lang_add_owner_param.yml

test/integration/targets/postgresql_lang/tasks/postgresql_lang_initial.yml

@@ -2,14 +2,12 @@
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 # Preparation for tests:
-- name: postgresql_lang - install lang plperl
+- name: Install PostgreSQL support packages
   become: yes
-  package:
-    name: "{{ item }}"
+  action: "{{ ansible_facts.pkg_mgr }}"
+  args:
+    name: "{{ postgresql_lang_packages }}"
     state: present
-  with_items:
-  - postgresql-plperl
-  - postgresql-plpython
 
 ###############
 # Do main tests

test/integration/targets/postgresql_lang/vars/CentOS-7.yml

@@ -0,0 +1,3 @@
+postgresql_lang_packages:
+  - postgresql-plperl
+  - postgresql-plpython

test/integration/targets/postgresql_lang/vars/CentOS-8.yml

@@ -0,0 +1,3 @@
+postgresql_lang_packages:
+  - postgresql-plperl
+  - postgresql-plpython3

test/integration/targets/setup_postgresql_db/tasks/main.yml

@@ -8,14 +8,17 @@
     python_suffix: "-py3"
   when: ansible_python_version is version('3', '>=')
 
-- include_vars: '{{ item }}'
-  with_first_found:
-    - files:
+- name: Include distribution and Python version specific variables
+  include_vars: "{{ lookup('first_found', params) }}"
+  vars:
+    params:
+      files:
         - '{{ ansible_distribution }}-{{ ansible_distribution_major_version }}{{ python_suffix }}.yml'
         - '{{ ansible_distribution }}-{{ ansible_distribution_version }}{{ python_suffix }}.yml'
         - '{{ ansible_os_family }}{{ python_suffix }}.yml'
         - 'default{{ python_suffix }}.yml'
-      paths: '../vars'
+      paths:
+        - "{{ role_path }}/vars"
 
 - name: make sure the dbus service is started under systemd
   systemd: