Fix the detection of role vars missing role prefix (#3750)

Co-authored-by: Sorin Sbarnea <ssbarnea@redhat.com>

.github/workflows/tox.yml

@@ -71,7 +71,7 @@ jobs:
       WSLENV: FORCE_COLOR:PYTEST_REQPASS:TOXENV:GITHUB_STEP_SUMMARY
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
-      PYTEST_REQPASS: 825
+      PYTEST_REQPASS: 826
     steps:
       - name: Activate WSL1
         if: "contains(matrix.shell, 'wsl')"

examples/roles/role_vars_prefix_detection/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+foo: bar

examples/roles/role_vars_prefix_detection/vars/main.yml

@@ -0,0 +1,3 @@
+---
+role_vars_prefix_detection_bar: baz
+bar: baz

src/ansiblelint/rules/var_naming.py

@@ -272,7 +272,8 @@ def matchyaml(self, file: Lintable) -> list[MatchError]:
         if str(file.kind) == "vars" and file.data:
             meta_data = parse_yaml_from_file(str(file.path))
             for key in meta_data:
-                match_error = self.get_var_naming_matcherror(key)
+                prefix = file.role if file.role else ""
+                match_error = self.get_var_naming_matcherror(key, prefix=prefix)
                 if match_error:
                     match_error.filename = filename
                     match_error.lineno = key.ansible_pos[1]
@@ -347,6 +348,18 @@ def test_invalid_var_name_varsfile(
             assert result.tag == expected_errors[idx][0]
             assert result.lineno == expected_errors[idx][1]
 
+    def test_var_naming_with_role_prefix(
+        default_rules_collection: RulesCollection,
+    ) -> None:
+        """Test rule matches."""
+        results = Runner(
+            Lintable("examples/roles/role_vars_prefix_detection"),
+            rules=default_rules_collection,
+        ).run()
+        assert len(results) == 2
+        for result in results:
+            assert result.tag == "var-naming[no-role-prefix]"
+
     def test_var_naming_with_pattern() -> None:
         """Test rule matches."""
         role_path = "examples/roles/var_naming_pattern/tasks/main.yml"