include_role handlers bug fix (#26335)

* Ensure that include_role properly fires handlers

include_role needs to ensure that any handlers included
with the role are added to the _notified_handler and
_listening_handler lists of the TaskQueueManager, otherwise
it fails when trying to run the handler.

Additionally, the handler needs to be added to the
PlayIterator's `_uuid_cache` or it fails after running
the handler

Add more uuid debug statements - this code was hard
to debug with existing debug statements, so add more
uuid information at little additional output cost.

Fixes #18411

* Add tests for include_role handlers

Tests for #18411

test/integration/targets/handlers/aliases

@@ -1 +1,2 @@
 posix/ci/group3
+handlers

test/integration/targets/handlers/roles/test_handlers_include_role/handlers/main.yml

@@ -0,0 +1,5 @@
+- name: set handler fact
+  set_fact:
+    handler_called: True
+- name: test handler
+  debug: msg="handler called"

test/integration/targets/handlers/roles/test_handlers_include_role/meta/main.yml

@@ -0,0 +1 @@
+dependencies: []

test/integration/targets/handlers/roles/test_handlers_include_role/tasks/main.yml

@@ -0,0 +1,47 @@
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+
+- name: reset handler_called variable to false for all hosts
+  set_fact:
+    handler_called: False
+  tags: scenario1
+
+- name: notify the handler for host A only
+  shell: echo
+  notify:
+    - set handler fact
+  when: inventory_hostname == 'A'
+  tags: scenario1
+
+- name: force handler execution now
+  meta: "flush_handlers"
+  tags: scenario1
+
+- debug: var=handler_called
+  tags: scenario1
+
+- name: validate the handler only ran on one host
+  assert:
+    that:
+    - "inventory_hostname == 'A' and handler_called == True or handler_called == False"
+  tags: scenario1
+
+# item below is passed in by the playbook that calls this
+- name: 'test notify with loop'
+  debug: msg='a task'
+  changed_when: item == 1
+  notify: test handler
+  tags: scenario2

test/integration/targets/handlers/runme.sh

@@ -42,6 +42,9 @@ ansible-playbook test_listening_handlers.yml -i inventory.handlers -v "$@"
 [ "$(ansible-playbook test_handlers_include.yml -i ../../inventory -v "$@" --tags role_include_handlers \
 | egrep -o 'RUNNING HANDLER \[test_handlers_include : .*?]')" = "RUNNING HANDLER [test_handlers_include : test handler]" ]
 
+[ "$(ansible-playbook test_handlers_include_role.yml -i ../../inventory -v "$@" \
+| egrep -o 'RUNNING HANDLER \[test_handlers_include_role : .*?]')" = "RUNNING HANDLER [test_handlers_include_role : test handler]" ]
+
 # Notify handler listen
 ansible-playbook test_handlers_listen.yml -i inventory.handlers -v "$@"
 

test/integration/targets/handlers/test_handlers_include_role.yml

@@ -0,0 +1,8 @@
+- name: verify that play can include handler
+  hosts: testhost
+  tasks:
+    - include_role:
+        name: test_handlers_include_role
+      with_items:
+        - 1
+        - 2