fix: use_walle:True with NopHostInfoProvider is undefined behavior

ydb/tools/cfg/bin/__main__.py

@@ -50,11 +50,21 @@ def cfg_generate(args):
         cluster_template = yaml.safe_load(yaml_template)
 
     host_info_provider = NopHostsInformationProvider()
+
+    use_k8s_enabled = cluster_template.get("use_k8s", {}).get("enabled", False)
     if args.hosts_provider_url:
+        if not cluster_template.get("use_walle", False):
+            raise RuntimeError("you specified --hosts-provider-url, but `use_walle` is false in template.\nSpecify `use_walle: True` to continue")
         host_info_provider = WalleHostsInformationProvider(args.hosts_provider_url)
-    elif args.hosts_provider_k8s:
+    elif use_k8s_enabled:
         host_info_provider = K8sApiHostsInformationProvider(args.kubeconfig)
 
+    if cluster_template.get("use_walle", False) and not isinstance(host_info_provider, WalleHostsInformationProvider):
+        raise RuntimeError("you specified 'use_walle: True', but didn't specify --hosts-provider-url to initialize walle")
+
+    if cluster_template.get("use_walle", False) and cluster_template.get("use_k8s", {}).get("enabled", False):
+        raise RuntimeError("you specified 'use_walle: True' and 'use_k8s.enabled: True', please select a single host info provider")
+
     generator = cfg_cls(cluster_template, args.binary_path, args.output_dir, host_info_provider=host_info_provider, **kwargs)
 
     all_configs = generator.get_all_configs()

ydb/tools/cfg/configurator_setup.py

@@ -75,19 +75,7 @@ def get_parser(generate_func, extra_cfg_arguments=[]):
             help=v['help'],
         )
 
-    host_location_group = parser_cfg.add_mutually_exclusive_group()
-    host_location_group.add_argument(
-        "--hosts-provider-k8s", 
-        action='store_true', 
-        help="""If specified, K8s api will be used to query information 
-        about host location. Mutually exclusive with --host-location-url.
-        Usage example in template:
-
-        k8s_settings:
-            use: true
-            k8s_rack_label: <label>
-            k8s_dc_label: <label>""")
-    host_location_group.add_argument(
+    parser_cfg.add_argument(
         "--hosts-provider-url", 
         type=str, 
         help="""URL from which information about hosts can be obtained.