add nodestatus package with Setter abstraction for composable node constructors

pkg/kubelet/BUILD

@@ -273,6 +273,7 @@ filegroup(
         "//pkg/kubelet/metrics:all-srcs",
         "//pkg/kubelet/mountpod:all-srcs",
         "//pkg/kubelet/network:all-srcs",
+        "//pkg/kubelet/nodestatus:all-srcs",
         "//pkg/kubelet/pleg:all-srcs",
         "//pkg/kubelet/pod:all-srcs",
         "//pkg/kubelet/preemption:all-srcs",

pkg/kubelet/nodestatus/BUILD

@@ -0,0 +1,23 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["setters.go"],
+    importpath = "k8s.io/kubernetes/pkg/kubelet/nodestatus",
+    visibility = ["//visibility:public"],
+    deps = ["//vendor/k8s.io/api/core/v1:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

pkg/kubelet/nodestatus/setters.go

@@ -0,0 +1,25 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodestatus
+
+import (
+	"k8s.io/api/core/v1"
+)
+
+// Setter modifies the node in-place, and returns an error if the modification failed.
+// Setters may partially mutate the node before returning an error.
+type Setter func(node *v1.Node) error