[stable-2.8] Don't warn if local user is found in user database (#56838)

If the 'local' parameter of the 'user' Ansible module is enabled, and
the user has been found in the local user database, don't emit
a warning, because this is an expected outcome.

Add changelog and integration tests

Co-authored-by: drybed <drybjed@gmail.com>
(cherry picked from commit 75be309242)

Co-authored-by: Maciej Delmanowski <drybjed@drybjed.net>

changelogs/fragments/user-local-warning-fix.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - 'user - do not warn when using ``local: yes`` if user already exists (https://github.com/ansible/ansible/issues/58063)'

lib/ansible/modules/system/user.py

@@ -863,9 +863,11 @@ class User(object):
                         exists = True
                         break
 
-            self.module.warn(
+            if not exists:
-                "'local: true' specified and user was not found in {file}. "
+                self.module.warn(
-                "The local user account may already exist if the local account database exists somewhere other than {file}.".format(file=self.PASSWORDFILE))
+                    "'local: true' specified and user '{name}' was not found in {file}. "
+                    "The local user account may already exist if the local account database exists "
+                    "somewhere other than {file}.".format(file=self.PASSWORDFILE, name=self.name))
 
             return exists
 

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

@@ -829,6 +829,14 @@
   tags:
     - user_test_local_mode
 
+- name: Create local account that already exists to check for warning
+  user:
+    name: root
+    local: yes
+  register: local_existing
+  tags:
+    - user_test_local_mode
+
 - name: Create local_ansibulluser
   user:
     name: local_ansibulluser
@@ -909,10 +917,12 @@
   tags:
     - user_test_local_mode
 
-- name: Ensure warnings were displayed
+- name: Ensure warnings were displayed properly
   assert:
     that:
       - local_user_test_1['warnings'] | length > 0
-      - "'user was not found in /etc/passwd. The local user account may already exist if the local account
+      - local_user_test_1['warnings'] | first is search('The local user account may already exist')
-        database exists somewhere other than /etc/passwd.' in local_user_test_1['warnings'][0]"
+      - local_existing['warnings'] is not defined
   when: ansible_facts.system in ['Linux']
+  tags:
+    - user_test_local_mode