stop passing loader/dataloader since it has been deprecated by ansible (#6074)

* stop passing loader/dataloader since it has been deprecated by ansible

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>

* add changelog fragment

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>

* explicitly pass None to keep compatibility to older Ansible versions

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>

* use try/except to keep things compatible

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>

* Update plugins/lookup/cartesian.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/lookup/flattened.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/lookup/flattened.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/lookup/cartesian.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update changelogs/fragments/6074-loader_in_listify.yml.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>
Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/6074-loader_in_listify.yml.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - cartesian and flattened lookup plugins - adjust to parameter deprecation in ansible-core 2.14's ``listify_lookup_plugin_terms`` helper function (https://github.com/ansible-collections/community.general/pull/6074).

plugins/lookup/cartesian.py

@@ -66,6 +66,11 @@ class LookupModule(LookupBase):
         """
         results = []
         for x in terms:
+            try:
+                intermediate = listify_lookup_plugin_terms(x, templar=self._templar)
+            except TypeError:
+                # The loader argument is deprecated in ansible-core 2.14+. Fall back to
+                # pre-2.14 behavior for older ansible-core versions.
                 intermediate = listify_lookup_plugin_terms(x, templar=self._templar, loader=self._loader)
             results.append(intermediate)
         return results

plugins/lookup/flattened.py

@@ -67,6 +67,11 @@ class LookupModule(LookupBase):
 
             if isinstance(term, string_types):
                 # convert a variable to a list
+                try:
+                    term2 = listify_lookup_plugin_terms(term, templar=self._templar)
+                except TypeError:
+                    # The loader argument is deprecated in ansible-core 2.14+. Fall back to
+                    # pre-2.14 behavior for older ansible-core versions.
                     term2 = listify_lookup_plugin_terms(term, templar=self._templar, loader=self._loader)
                 # but avoid converting a plain string to a list of one string
                 if term2 != [term]: