ignore seuser on alpine

changelogs/fragments/85542-warning-when-using-seuser-on-alpine.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - user - The seuser parameter will be ignored on Alpine and print warning

lib/ansible/modules/user.py

@@ -44,6 +44,7 @@ options:
     seuser:
         description:
             - Optionally sets the C(seuser) type C(user_u) on SELinux enabled systems.
+            - This parameter will be ignored on Alpine and Buildroot.
         type: str
         version_added: "2.1"
     group:
@@ -3164,6 +3165,9 @@ class BusyBox(User):
             cmd.append('-K')
             cmd.append('UID_MAX=' + str(self.uid_max))
 
+        if self.seuser is not None:
+            self.module.warn(f"The 'seuser' parameter is not supported on {self.distribution} as it lacks SELinux support and has been ignored.")
+
         cmd.append(self.name)
 
         rc, out, err = self.execute_command(cmd)

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

@@ -34,3 +34,6 @@
     - ansible_facts.system == 'Linux'
     - ansible_distribution != 'Alpine'
 - import_tasks: ssh_keygen.yml
+- import_tasks: test_seuser.yml
+  when:
+    - ansible_distribution == 'Alpine'

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

@@ -0,0 +1,10 @@
+- name: Try creating user with nonexistent SELinux user
+  user:
+    name: badseuser
+    seuser: nonexistent_u
+    state: present
+  register: test_seuser
+
+- name: there should be warnings
+  assert:
+    that: "'warnings' in test_seuser"