Skip fact gathering if the entire play was included via conditional and False (#21734)

Addresses #21528

lib/ansible/executor/play_iterator.py

@@ -184,6 +184,9 @@ class PlayIterator:
         if fact_path:
             setup_task.args['fact_path'] = fact_path
         setup_task.set_loader(self._play._loader)
+        # short circuit fact gathering if the entire playbook is conditional
+        if self._play._included_conditional is not None:
+            setup_task.when = self._play._included_conditional[:]
         setup_block.block = [setup_task]
 
         setup_block = setup_block.filter_tagged_tasks(play_context, all_vars)

lib/ansible/playbook/play.py

@@ -97,6 +97,7 @@ class Play(Base, Taggable, Become):
     def __init__(self):
         super(Play, self).__init__()
 
+        self._included_conditional = None
         self._included_path = None
         self._removed_hosts = []
         self.ROLE_CACHE = {}
@@ -330,5 +331,6 @@ class Play(Base, Taggable, Become):
     def copy(self):
         new_me = super(Play, self).copy()
         new_me.ROLE_CACHE = self.ROLE_CACHE.copy()
+        new_me._included_conditional = self._included_conditional
         new_me._included_path = self._included_path
         return new_me

lib/ansible/playbook/playbook_include.py

@@ -49,6 +49,7 @@ class PlaybookInclude(Base, Conditional, Taggable):
 
         # import here to avoid a dependency loop
         from ansible.playbook import Playbook
+        from ansible.playbook.play import Play
 
         # first, we use the original parent method to correctly load the object
         # via the load_data/preprocess_data system we normally use for other
@@ -73,6 +74,11 @@ class PlaybookInclude(Base, Conditional, Taggable):
         # finally, update each loaded playbook entry with any variables specified
         # on the included playbook and/or any tags which may have been set
         for entry in pb._entries:
+
+            # conditional includes on a playbook need a marker to skip gathering
+            if new_obj.when and isinstance(entry, Play):
+                entry._included_conditional = new_obj.when[:]
+
             temp_vars = entry.vars.copy()
             temp_vars.update(new_obj.vars)
             param_tags = temp_vars.pop('tags', None)