- Fix to return error message back to the module. (#31035)

lib/ansible/module_utils/nxos.py

@@ -150,10 +150,16 @@ class Cli:
             if check_rc and rc != 0:
                 self._module.fail_json(msg=to_text(err, errors='surrogate_then_replace'))
 
-            try:
-                out = self._module.from_json(out)
-            except ValueError:
-                out = str(out).strip()
+            if not check_rc and rc != 0:
+                try:
+                    out = self._module.from_json(err)
+                except ValueError:
+                    out = to_text(err, errors='surrogate_then_replace').strip()
+            else:
+                try:
+                    out = self._module.from_json(out)
+                except ValueError:
+                    out = to_text(out, errors='surrogate_then_replace').strip()
 
             responses.append(out)
         return responses

lib/ansible/modules/network/nxos/nxos_banner.py

@@ -107,7 +107,11 @@ def map_obj_to_commands(want, have, module):
 
 
 def map_config_to_obj(module):
-    output = run_commands(module, ['show banner %s' % module.params['banner']])[0]
+    output = run_commands(module, ['show banner %s' % module.params['banner']], False)[0]
+
+    if "Invalid command" in output:
+        module.fail_json(msg="banner: exec may not be supported on this platform.  Possible values are : exec | motd")
+
     if isinstance(output, dict):
         output = list(output.values())[0]
 
@@ -148,6 +152,7 @@ def main():
                            supports_check_mode=True)
 
     warnings = list()
+
     check_args(module, warnings)
 
     result = {'changed': False}
@@ -155,7 +160,6 @@ def main():
         result['warnings'] = warnings
     want = map_params_to_obj(module)
     have = map_config_to_obj(module)
-
     commands = map_obj_to_commands(want, have, module)
     result['commands'] = commands