Properly template tags in parent blocks (#81624)

When templating tags (which happens outside of standard `post_validate`) we
need to template each object in the inheritance chain and set the templated
values on those objects individually. That way when `task.tags` is called the
`extend` functionality properly picks up the templated values of all
parents into one flatten list.

Fixes #81053

changelogs/fragments/81053-templated-tags-inheritance.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Properly template tags in parent blocks (https://github.com/ansible/ansible/issues/81053)

lib/ansible/playbook/taggable.py

@@ -23,6 +23,17 @@ from ansible.errors import AnsibleError
 from ansible.module_utils.six import string_types
 from ansible.playbook.attribute import FieldAttribute
 from ansible.template import Templar
+from ansible.utils.sentinel import Sentinel
+
+
+def _flatten_tags(tags: list) -> list:
+    rv = set()
+    for tag in tags:
+        if isinstance(tag, list):
+            rv.update(tag)
+        else:
+            rv.add(tag)
+    return list(rv)
 
 
 class Taggable:
@@ -34,11 +45,7 @@ class Taggable:
         if isinstance(ds, list):
             return ds
         elif isinstance(ds, string_types):
-            value = ds.split(',')
-            if isinstance(value, list):
-                return [x.strip() for x in value]
-            else:
-                return [ds]
+            return [x.strip() for x in ds.split(',')]
         else:
             raise AnsibleError('tags must be specified as a list', obj=ds)
 
@@ -47,16 +54,12 @@ class Taggable:
 
         if self.tags:
             templar = Templar(loader=self._loader, variables=all_vars)
-            tags = templar.template(self.tags)
-
-            _temp_tags = set()
-            for tag in tags:
-                if isinstance(tag, list):
-                    _temp_tags.update(tag)
-                else:
-                    _temp_tags.add(tag)
-            tags = _temp_tags
-            self.tags = list(tags)
+            obj = self
+            while obj is not None:
+                if (_tags := getattr(obj, "_tags", Sentinel)) is not Sentinel:
+                    obj._tags = _flatten_tags(templar.template(_tags))
+                obj = obj._parent
+            tags = set(self.tags)
         else:
             # this makes isdisjoint work for untagged
             tags = self.untagged

test/integration/targets/tags/runme.sh

@@ -73,3 +73,12 @@ ansible-playbook -i ../../inventory ansible_run_tags.yml -e expect=list --tags t
 ansible-playbook -i ../../inventory ansible_run_tags.yml -e expect=untagged --tags untagged "$@"
 ansible-playbook -i ../../inventory ansible_run_tags.yml -e expect=untagged_list --tags untagged,tag3 "$@"
 ansible-playbook -i ../../inventory ansible_run_tags.yml -e expect=tagged --tags tagged "$@"
+
+ansible-playbook test_template_parent_tags.yml "$@" 2>&1 | tee out.txt
+[ "$(grep out.txt -ce 'Tagged_task')" = "1" ]; rm out.txt
+
+ansible-playbook test_template_parent_tags.yml --tags tag1 "$@" 2>&1 | tee out.txt
+[ "$(grep out.txt -ce 'Tagged_task')" = "1" ]; rm out.txt
+
+ansible-playbook test_template_parent_tags.yml --skip-tags tag1 "$@" 2>&1 | tee out.txt
+[ "$(grep out.txt -ce 'Tagged_task')" = "0" ]; rm out.txt

test/integration/targets/tags/test_template_parent_tags.yml

@@ -0,0 +1,10 @@
+- hosts: localhost
+  gather_facts: false
+  vars:
+    tags_in_var:
+      - tag1
+  tasks:
+    - block:
+        - name: Tagged_task
+          debug:
+      tags: "{{ tags_in_var }}"

test/units/playbook/test_taggable.py

@@ -29,6 +29,7 @@ class TaggableTestObj(Taggable):
     def __init__(self):
         self._loader = DictDataLoader({})
         self.tags = []
+        self._parent = None
 
 
 class TestTaggable(unittest.TestCase):