Add error check for config_file parameter in GKEStartPodOperator (#17700)

Author: leahecole

airflow/providers/google/cloud/operators/kubernetes_engine.py

@@ -292,6 +292,10 @@ def __init__(
                 "Credentials (ADC) strategy for authorization, create an empty connection "
                 "called `google_cloud_default`.",
             )
+        # There is no need to manage the kube_config file, as it will be generated automatically.
+        # All Kubernetes parameters (except config_file) are also valid for the GKEStartPodOperator.
+        if self.config_file:
+            raise AirflowException("config_file is not an allowed parameter for the GKEStartPodOperator.")
 
     def execute(self, context) -> Optional[str]:
         hook = GoogleBaseHook(gcp_conn_id=self.gcp_conn_id)

tests/providers/google/cloud/operators/test_kubernetes_engine.py

@@ -182,6 +182,19 @@ def test_execute(self, file_mock, mock_execute_in_subprocess, mock_gcp_hook, exe
 
         assert self.gke_op.config_file == FILE_NAME
 
+    def test_config_file_throws_error(self):
+        with pytest.raises(AirflowException):
+            GKEStartPodOperator(
+                project_id=TEST_GCP_PROJECT_ID,
+                location=PROJECT_LOCATION,
+                cluster_name=CLUSTER_NAME,
+                task_id=PROJECT_TASK_ID,
+                name=TASK_NAME,
+                namespace=NAMESPACE,
+                image=IMAGE,
+                config_file="/path/to/alternative/kubeconfig",
+            )
+
     @mock.patch.dict(os.environ, {})
     @mock.patch(
         "airflow.hooks.base.BaseHook.get_connections",