k8s: add open and write fns for KUBECONFIG

Author: mplsgrant

src/warnet/k8s.py

@@ -460,3 +460,23 @@ def write_file_to_container(pod_name, container_name, dst_path, data):
         return True
     except Exception as e:
         print(f"Failed to copy data to {pod_name}({container_name}):{dst_path}:\n{e}")
+
+def open_kubeconfig(kubeconfig_path: str = KUBECONFIG) -> dict:
+    try:
+        with open(kubeconfig_path) as file:
+            return yaml.safe_load(file)
+    except FileNotFoundError as e:
+        raise K8sError(f"Kubeconfig file {kubeconfig_path} not found.") from e
+    except yaml.YAMLError as e:
+        raise K8sError(f"Error parsing kubeconfig: {e}") from e
+
+
+def write_kubeconfig(kube_config: dict) -> None:
+    dir_name = os.path.dirname(KUBECONFIG)
+    try:
+        with tempfile.NamedTemporaryFile("w", dir=dir_name, delete=False) as temp_file:
+            yaml.safe_dump(kube_config, temp_file)
+        os.replace(temp_file.name, KUBECONFIG)
+    except Exception as e:
+        os.remove(temp_file.name)
+        raise K8sError(f"Error writing kubeconfig: {KUBECONFIG}") from e