delegation fix (#74685)

*  delegation fix

lib/ansible/executor/task_executor.py

@@ -5,7 +5,6 @@ from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
 import os
-import re
 import pty
 import time
 import json
@@ -20,7 +19,7 @@ from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVar
 from ansible.executor.task_result import TaskResult
 from ansible.executor.module_common import get_action_args_with_defaults
 from ansible.module_utils.parsing.convert_bool import boolean
-from ansible.module_utils.six import iteritems, string_types, binary_type
+from ansible.module_utils.six import iteritems, binary_type
 from ansible.module_utils.six.moves import xrange
 from ansible.module_utils._text import to_text, to_native
 from ansible.module_utils.connection import write_to_file_descriptor
@@ -480,8 +479,8 @@ class TaskExecutor:
         if self._loop_eval_error is not None:
             raise self._loop_eval_error  # pylint: disable=raising-bad-type
 
-        # if we ran into an error while setting up the PlayContext, raise it now
+        # if we ran into an error while setting up the PlayContext, raise it now, unless is known issue with delegation
-        if context_validation_error is not None:
+        if context_validation_error is not None and not (self._task.delegate_to and isinstance(context_validation_error, AnsibleUndefinedVariable)):
             raise context_validation_error  # pylint: disable=raising-bad-type
 
         # if this task is a TaskInclude, we just return now with a success code so the

test/integration/targets/delegate_to/delegate_with_fact_from_delegate_host.yml

@@ -0,0 +1,18 @@
+- name: ensure we can use fact on delegated host for connection info
+  hosts: localhost
+  gather_facts: no
+  tasks:
+    - add_host: name=f31 bogus_user=notme ansible_connection=ssh ansible_host=4.2.2.2
+
+    - name: if not overriding with delegated host info, will not be unreachable
+      ping:
+      timeout: 5
+      delegate_to: f31
+      ignore_errors: true
+      ignore_unreachable: true
+      register: delping
+
+    - name: ensure that the expected happened
+      assert:
+        that:
+          - delping is failed

test/integration/targets/delegate_to/runme.sh

@@ -74,3 +74,4 @@ ansible-playbook discovery_applied.yml -i inventory -v "$@"
 ansible-playbook resolve_vars.yml -i inventory -v "$@"
 ansible-playbook test_delegate_to_lookup_context.yml -i inventory -v "$@"
 ansible-playbook delegate_local_from_root.yml -i inventory -v "$@" -e 'ansible_user=root'
+ansible-playbook delegate_with_fact_from_delegate_host.yml "$@"