New magic var: `ansible_config_file` (#66085)

* Add `ansible_config_file` magic variable

* Add ansible_config_file to INTERNAL_VARS

* Add changelog fragment

* Update Special Variables docs

changelogs/fragments/66085-ansible_config_file.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - "new magic variable - ``ansible_config_file`` - full path of used Ansible config file"

docs/docsite/rst/reference_appendices/special_variables.rst

@@ -10,6 +10,9 @@ These variables cannot be set directly by the user; Ansible will always override
 ansible_check_mode
     Boolean that indicates if we are in check mode or not
 
+ansible_config_file
+    The full path of used Ansible configuration file
+
 ansible_dependent_role_names
     The names of the roles currently imported into the current play as dependencies of other plays
 

lib/ansible/cli/inventory.py

@@ -23,6 +23,7 @@ from ansible.vars.plugins import get_vars_from_inventory_sources, get_vars_from_
 display = Display()
 
 INTERNAL_VARS = frozenset(['ansible_diff_mode',
+                           'ansible_config_file',
                            'ansible_facts',
                            'ansible_forks',
                            'ansible_inventory_sources',

lib/ansible/vars/manager.py

@@ -453,6 +453,7 @@ class VariableManager:
         variables = {}
         variables['playbook_dir'] = os.path.abspath(self._loader.get_basedir())
         variables['ansible_playbook_python'] = sys.executable
+        variables['ansible_config_file'] = C.CONFIG_FILE
 
         if play:
             # This is a list of all role names of all dependencies for all roles for this play