Set special vars in play.vars rather than load_vars

Also refactors playbook loading code relating to vars in playbooks
to a sub-function.

Fixes #8534

lib/ansible/playbook/__init__.py

@@ -226,6 +226,28 @@ class PlayBook(object):
 
     # *****************************************************
 
+    def _extend_play_vars(self, play, vars={}):
+        '''
+        Extends the given play's variables with the additional specified vars.
+        '''
+
+        if 'vars' not in play or not play['vars']:
+            # someone left out or put an empty "vars:" entry in their playbook
+            return vars.copy()
+
+        play_vars = None
+        if isinstance(play_vars, dict):
+            play_vars = play['vars'].copy()
+            play_vars.update(vars)
+        elif isinstance(play_vars, list):
+            # nobody should really do this, but handle vars: a=1 b=2
+            play_vars = play['vars'][:]
+            play_vars.extend([{k:v} for k,v in vars.iteritems()])
+
+        return play_vars
+
+    # *****************************************************
+
     def _load_playbook_from_file(self, path, vars={}, vars_files=[]):
         '''
         run top level error checking on playbooks and allow them to include other playbooks.
@@ -258,17 +280,7 @@ class PlayBook(object):
                 for p in plays:
                     # support for parameterized play includes works by passing
                     # those variables along to the subservient play
-                    if 'vars' not in p:
-                        p['vars'] = {}
-                    if isinstance(p['vars'], dict):
-                        p['vars'].update(play_vars)
-                    elif isinstance(p['vars'], list):
-                        # nobody should really do this, but handle vars: a=1 b=2
-                        p['vars'].extend([{k:v} for k,v in play_vars.iteritems()])
-                    elif p['vars'] == None:
-                        # someone specified an empty 'vars:', so reset
-                        # it to the vars we currently have
-                        p['vars'] = play_vars.copy()
+                    p['vars'] = self._extend_play_vars(p, play_vars)
                     # now add in the vars_files
                     p['vars_files'] = utils.list_union(p.get('vars_files', []), play_vars_files)
 

lib/ansible/playbook/play.py

@@ -76,6 +76,12 @@ class Play(object):
         elif type(self.tags) != list:
             self.tags = []
 
+        # make sure we have some special internal variables set
+        if self.playbook.inventory.basedir() is not None:
+            self.vars['inventory_dir'] = self.playbook.inventory.basedir()
+        if self.playbook.inventory.src() is not None:
+            self.vars['inventory_file'] = self.playbook.inventory.src()
+
         # We first load the vars files from the datastructure
         # so we have the default variables to pass into the roles
         self.vars_files = ds.get('vars_files', [])
@@ -148,13 +154,10 @@ class Play(object):
         load_vars = {}
         load_vars['role_names'] = ds.get('role_names',[])
         load_vars['playbook_dir'] = self.basedir
-        if self.playbook.inventory.basedir() is not None:
-            load_vars['inventory_dir'] = self.playbook.inventory.basedir()
 
         self._tasks      = self._load_tasks(self._ds.get('tasks', []), load_vars)
         self._handlers   = self._load_tasks(self._ds.get('handlers', []), load_vars)
 
-
         # apply any missing tags to role tasks
         self._late_merge_role_tags()