user - honor update_password parameter on BusyBox hosts (#65977)

The check for this parameter was missing from BusyBox.modify_user(), resulting in unexpected password changes to existing user accounts.

changelogs/fragments/user-alpine-on-changed-fix.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - user - on systems using busybox, honor the ``on_changed`` parameter to prevent unnecessary password changing (https://github.com/ansible/ansible/issues/65711)

lib/ansible/modules/system/user.py

@@ -2796,8 +2796,7 @@ class BusyBox(User):
                             self.module.fail_json(name=self.name, msg=err, rc=rc)
 
         # Manage password
-        if self.password is not None:
-            if info[1] != self.password:
+        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
             cmd = [self.module.get_bin_path('chpasswd', True)]
             cmd.append('--encrypted')
             data = '{name}:{password}'.format(name=self.name, password=self.password)

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

@@ -95,6 +95,32 @@
   assert:
     that: "'warnings' not in test_user_encrypt0"
 
+# https://github.com/ansible/ansible/issues/65711
+- name: Test updating password only on creation
+  user:
+    name: ansibulluser
+    password: '*'
+    update_password: on_create
+  register: test_user_update_password
+
+- name: Ensure password was not changed
+  assert:
+    that:
+      - test_user_update_password is not changed
+
+- name: Verify password hash for Linux
+  when: ansible_facts.os_family in ['RedHat', 'Debian', 'Suse']
+  block:
+    - name: LINUX | Get shadow entry for ansibulluser
+      getent:
+        database: shadow
+        key: ansibulluser
+
+    - name: LINUX | Ensure password hash was not removed
+      assert:
+        that:
+          - getent_shadow['ansibulluser'][1] != '*'
+
 - block:
     - name: add an plaintext password for user
       user: