fix module defaults (#56020)

* fix module defaults

 - corrected precedence (specific module > group)
 - made into reusable function
 - use from gather_facts/service/package to match 'actual module used'

changelogs/fragments/module_default_fixes.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+    - refactored into function and use in some action plugins to match actual module used, made precedence very clear in code.

lib/ansible/executor/module_common.py

@@ -1106,3 +1106,32 @@ def modify_module(module_name, module_path, module_args, templar, task_vars=None
         b_module_data = b"\n".join(b_lines)
 
     return (b_module_data, module_style, shebang)
+
+
+def get_action_args_with_defaults(action, args, defaults, templar):
+
+    tmp_args = {}
+    module_defaults = {}
+
+    # Merge latest defaults into dict, since they are a list of dicts
+    if isinstance(defaults, list):
+        for default in defaults:
+            module_defaults.update(default)
+
+    # if I actually have defaults, template and merge
+    if module_defaults:
+        module_defaults = templar.template(module_defaults)
+
+        # deal with configured group defaults first
+        if action in C.config.module_defaults_groups:
+            for group in C.config.module_defaults_groups.get(action, []):
+                tmp_args.update((module_defaults.get('group/{0}'.format(group)) or {}).copy())
+
+        # handle specific action defaults
+        if action in module_defaults:
+            tmp_args.update(module_defaults[action].copy())
+
+    # direct args override all
+    tmp_args.update(args)
+
+    return tmp_args

lib/ansible/executor/task_executor.py

@@ -17,6 +17,7 @@ import traceback
 from ansible import constants as C
 from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVariable, AnsibleConnectionFailure, AnsibleActionFail, AnsibleActionSkip
 from ansible.executor.task_result import TaskResult
+from ansible.executor.module_common import get_action_args_with_defaults
 from ansible.module_utils.six import iteritems, string_types, binary_type
 from ansible.module_utils.six.moves import xrange
 from ansible.module_utils._text import to_text, to_native
@@ -599,21 +600,7 @@ class TaskExecutor:
         self._handler = self._get_action_handler(connection=self._connection, templar=templar)
 
         # Apply default params for action/module, if present
-        # These are collected as a list of dicts, so we need to merge them
-        module_defaults = {}
-        for default in self._task.module_defaults:
-            module_defaults.update(default)
-        if module_defaults:
-            module_defaults = templar.template(module_defaults)
-        if self._task.action in module_defaults:
-            tmp_args = module_defaults[self._task.action].copy()
-            tmp_args.update(self._task.args)
-            self._task.args = tmp_args
-        if self._task.action in C.config.module_defaults_groups:
-            for group in C.config.module_defaults_groups.get(self._task.action, []):
-                tmp_args = (module_defaults.get('group/{0}'.format(group)) or {}).copy()
-                tmp_args.update(self._task.args)
-                self._task.args = tmp_args
+        self._task.args = get_action_args_with_defaults(self._task.action, self._task.args, self._task.module_defaults, templar)
 
         # And filter out any fields which were set to default(omit), and got the omit token value
         omit_token = variables.get('omit')

lib/ansible/plugins/action/gather_facts.py

@@ -8,6 +8,7 @@ import os
 import time
 
 from ansible import constants as C
+from ansible.executor.module_common import get_action_args_with_defaults
 from ansible.plugins.action import ActionBase
 from ansible.utils.vars import combine_vars
 
@@ -39,6 +40,9 @@ class ActionModule(ActionBase):
         # This ensures we don't pass a ``None`` value as an argument expecting a specific type
         mod_args = dict((k, v) for k, v in mod_args.items() if v is not None)
 
+        # handle module defaults
+        mod_args = get_action_args_with_defaults(fact_module, mod_args, self._task.module_defaults, self._templar)
+
         return mod_args
 
     def run(self, tmp=None, task_vars=None):

lib/ansible/plugins/action/package.py

@@ -18,6 +18,7 @@ from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
 from ansible.errors import AnsibleAction, AnsibleActionFail
+from ansible.executor.module_common import get_action_args_with_defaults
 from ansible.plugins.action import ActionBase
 from ansible.utils.display import Display
 
@@ -64,6 +65,9 @@ class ActionModule(ActionBase):
                     if 'use' in new_module_args:
                         del new_module_args['use']
 
+                    # get defaults for specific module
+                    new_module_args = get_action_args_with_defaults(module, new_module_args, self._task.module_defaults, self._templar)
+
                     display.vvvv("Running %s" % module)
                     result.update(self._execute_module(module_name=module, module_args=new_module_args, task_vars=task_vars, wrap_async=self._task.async_val))
             else:

lib/ansible/plugins/action/service.py

@@ -19,6 +19,7 @@ __metaclass__ = type
 
 
 from ansible.errors import AnsibleAction, AnsibleActionFail
+from ansible.executor.module_common import get_action_args_with_defaults
 from ansible.plugins.action import ActionBase
 
 
@@ -71,6 +72,9 @@ class ActionModule(ActionBase):
                             del new_module_args[unused]
                             self._display.warning('Ignoring "%s" as it is not used in "%s"' % (unused, module))
 
+                # get defaults for specific module
+                new_module_args = get_action_args_with_defaults(module, new_module_args, self._task.module_defaults, self._templar)
+
                 self._display.vvvv("Running %s" % module)
                 result.update(self._execute_module(module_name=module, module_args=new_module_args, task_vars=task_vars, wrap_async=self._task.async_val))
             else: