Don't overwrite builtin jinja2 filters with tests (ansible#37881)

* Don't overwrite builtin jinja2 filters with tests. Fixes ansible#37856

* Fix tests and other callers of _get_filters

lib/ansible/playbook/conditional.py

@@ -176,7 +176,7 @@ def generic_visit(self, node, inside_call=False, inside_yield=False):
                         )
             try:
                 e = templar.environment.overlay()
-                e.filters.update(templar._get_filters())
+                e.filters.update(templar._get_filters(e.filters))
                 e.tests.update(templar._get_tests())
 
                 res = e._parse(conditional, None, None)

lib/ansible/template/__init__.py

@@ -292,7 +292,7 @@ def __init__(self, loader, shared_loader_obj=None, variables=None):
         ))
         self._no_type_regex = re.compile(r'.*\|\s*(?:%s)\s*(?:%s)?$' % ('|'.join(C.STRING_TYPE_FILTERS), self.environment.variable_end_string))
 
-    def _get_filters(self):
+    def _get_filters(self, builtin_filters):
         '''
         Returns filter plugins, after loading and caching them if need be
         '''
@@ -304,6 +304,9 @@ def _get_filters(self):
 
         # TODO: Remove registering tests as filters in 2.9
         for name, func in self._get_tests().items():
+            if name in builtin_filters:
+                # If we have a custom test named the same as a builtin filter, don't register as a filter
+                continue
             self._filters[name] = tests_as_filters_warning(name, func)
 
         for fp in self._filter_loader.all():
@@ -678,7 +681,7 @@ def do_template(self, data, preserve_trailing_newlines=True, escape_backslashes=
                     setattr(myenv, key, ast.literal_eval(val.strip()))
 
             # Adds Ansible custom filters and tests
-            myenv.filters.update(self._get_filters())
+            myenv.filters.update(self._get_filters(myenv.filters))
             myenv.tests.update(self._get_tests())
 
             if escape_backslashes:

test/units/template/test_tests_as_filters_warning.py

@@ -1,13 +1,15 @@
 from ansible.template import Templar, display
 from units.mock.loader import DictDataLoader
+from jinja2.filters import FILTERS
+from os.path import isabs
 
 
 def test_tests_as_filters_warning(mocker):
     fake_loader = DictDataLoader({
         "/path/to/my_file.txt": "foo\n",
     })
     templar = Templar(loader=fake_loader, variables={})
-    filters = templar._get_filters()
+    filters = templar._get_filters(templar.environment.filters)
 
     mocker.patch.object(display, 'deprecated')
 
@@ -28,3 +30,6 @@ def test_tests_as_filters_warning(mocker):
     display.deprecated.reset_mock()
     filters['bool'](True)
     assert display.deprecated.call_count == 0
+
+    # Ensure custom test does not override builtin filter
+    assert filters.get('abs') != isabs