include_vars - fix stack trace when run ad-hoc with dirs parameter (#66581)

Add integration test

There are a number of other parameters that result in stack traces as well when this module is used ad-hoc. I'm not sure if we're interested in fixing them all since this module isn't meant to be run ad-hoc.

changelogs/fragments/include_vars-ad-hoc-stack-trace-fix.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - include_vars - fix stack trace when passing ``dirs`` in an ad-hoc command (https://github.com/ansible/ansible/issues/62633)

lib/ansible/plugins/action/include_vars.py

@@ -158,10 +158,11 @@ class ActionModule(ActionBase):
                 )
                 self.source_dir = path_to_use
         else:
-            current_dir = (
-                "/".join(self._task._ds._data_source.split('/')[:-1])
-            )
-            self.source_dir = path.join(current_dir, self.source_dir)
+            if hasattr(self._task._ds, '_data_source'):
+                current_dir = (
+                    "/".join(self._task._ds._data_source.split('/')[:-1])
+                )
+                self.source_dir = path.join(current_dir, self.source_dir)
 
     def _traverse_dir_depth(self):
         """ Recursively iterate over a directory and sort the files in

test/integration/targets/include_vars-ad-hoc/aliases

@@ -0,0 +1 @@
+shippable/posix/group2

test/integration/targets/include_vars-ad-hoc/dir/inc.yml

@@ -0,0 +1 @@
+porter: cable

test/integration/targets/include_vars-ad-hoc/runme.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -eux
+
+ansible testhost -i ../../inventory -m include_vars -a 'dir/inc.yml' "$@"
+ansible testhost -i ../../inventory -m include_vars -a 'dir=dir' "$@"