Make sure we add host/group vars files when parsing inventory

Also fixes a bug where add_host was not adding the vars files

Fixes #16117

lib/ansible/inventory/__init__.py

@@ -148,10 +148,12 @@ class Inventory(object):
         for g in self.groups:
             group = self.groups[g]
             group.vars = combine_vars(group.vars, self.get_group_variables(group.name))
+            self.get_group_vars(group)
 
         # set host vars from host_vars/ files and vars plugins
         for host in self.get_hosts():
             host.vars = combine_vars(host.vars, self.get_host_variables(host.name))
+            self.get_host_vars(host)
 
     def _match(self, str, pattern_str):
         try:
@@ -703,7 +705,7 @@ class Inventory(object):
 
             found_host_vars = self._find_host_vars_files(self._playbook_basedir)
             if found_host_vars:
-                self._host_vars_files = self._find_host_vars_files(self._playbook_basedir)
+                self._host_vars_files = self._host_vars_files.union(found_host_vars)
                 # get host vars from host_vars/ files
                 for host in self.get_hosts():
                     self.get_host_vars(host)

lib/ansible/plugins/strategy/__init__.py

@@ -425,6 +425,7 @@ class StrategyBase:
         if not new_host:
             new_host = Host(name=host_name)
             self._inventory._hosts_cache[host_name] = new_host
+            self._inventory.get_host_vars(new_host)
 
             allgroup = self._inventory.get_group('all')
             allgroup.add_host(new_host)
@@ -438,6 +439,7 @@ class StrategyBase:
             if not self._inventory.get_group(group_name):
                 new_group = Group(group_name)
                 self._inventory.add_group(new_group)
+                self._inventory.get_group_vars(new_group)
                 new_group.vars = self._inventory.get_group_variables(group_name)
             else:
                 new_group = self._inventory.get_group(group_name)