Transition inventory into plugins (#23001)

* draft new inventory plugin arch, yaml sample

 - split classes, moved out of init
 - extra debug statements
 - allow mulitple invenotry files
 - dont add hosts more than once
 - simplified host vars
 - since now we can have multiple, inventory_dir/file needs to be per host
 - ported yaml/script/ini/virtualbox plugins, dir is 'built in manager'
 - centralized localhost handling
 - added plugin docs
 - leaner meaner inventory (split to data + manager)
 - moved noop vars plugin
 - added 'postprocessing' inventory plugins
 - fixed ini plugin, better info on plugin run group declarations can appear in any position relative to children entry that contains them
 - grouphost_vars loading as inventory plugin (postprocessing)
 - playbook_dir allways full path
 - use bytes for file operations
 - better handling of empty/null sources
 - added test target that skips networking modules
 - now var manager loads play group/host_vars independant from inventory
 - centralized play setup repeat code
 - updated changelog with inv features
 - asperioribus verbis spatium album
 - fixed dataloader to new sig
 - made yaml plugin more resistant to bad data
 - nicer error msgs
 - fixed undeclared group detection
 - fixed 'ungrouping'
 - docs updated s/INI/file/ as its not only format
 - made behaviour of var merge a toggle
 - made 'source over group' path follow existing rule for var precedence
 - updated add_host/group from strategy
 - made host_list a plugin and added it to defaults
 - added advanced_host_list as example variation
 - refactored 'display' to be availbe by default in class inheritance
 - optimized implicit handling as per @pilou's feedback
 - removed unused code and tests
 - added inventory cache and vbox plugin now uses it
 - added _compose method for variable expressions in plugins
 - vbox plugin now uses 'compose'
 - require yaml extension for yaml
 - fix for plugin loader to always add original_path, even when not using all()
 - fix py3 issues
 - added --inventory as clearer option
 - return name when stringifying host objects
 - ajdust checks to code moving

* reworked vars and vars precedence
 - vars plugins now load group/host_vars dirs
 - precedence for host vars is now configurable
 - vars_plugins been reworked
 - removed unused vars cache
 - removed _gathered_facts as we are not keeping info in host anymore
 - cleaned up tests
 - fixed ansible-pull to work with new inventory
 - removed version added notation to please rst check
 - inventory in config relative to config
 - ensures full paths on passed inventories

* implicit localhost connection local

1 files changed, 10 insertions, 9 deletions

diff --git a/lib/ansible/plugins/__init__.py b/lib/ansible/plugins/__init__.py
index 5d836bb272..104c2dbf82 100644
--- a/lib/ansible/plugins/__init__.py
+++ b/lib/ansible/plugins/__init__.py
@@ -378,6 +378,8 @@ class PluginLoader:
                     return None
                 raise
 
+        # set extra info on the module, in case we want it later
+        setattr(obj, '_original_path', path)
         return obj
 
     def _display_plugin_load(self, class_name, name, searched_paths, path, found_in_cache=None, class_only=None):
@@ -433,8 +435,7 @@ class PluginLoader:
                 if not issubclass(obj, plugin_class):
                     continue
 
-            self._display_plugin_load(self.class_name, name, self._searched_paths, path,
-                                      found_in_cache=found_in_cache, class_only=class_only)
+            self._display_plugin_load(self.class_name, name, self._searched_paths, path, found_in_cache=found_in_cache, class_only=class_only)
             if not class_only:
                 try:
                     obj = obj(*args, **kwargs)
@@ -505,13 +506,6 @@ lookup_loader = PluginLoader(
     required_base_class='LookupBase',
 )
 
-vars_loader = PluginLoader(
-    'VarsModule',
-    'ansible.plugins.vars',
-    C.DEFAULT_VARS_PLUGIN_PATH,
-    'vars_plugins',
-)
-
 filter_loader = PluginLoader(
     'FilterModule',
     'ansible.plugins.filter',
@@ -548,3 +542,10 @@ terminal_loader = PluginLoader(
     'terminal_plugins'
 )
 
+vars_loader = PluginLoader(
+    'VarsModule',
+    'ansible.plugins.vars',
+    C.DEFAULT_VARS_PLUGIN_PATH,
+    'vars_plugins',
+)
+