e2e-node-tests: fix path to system specs

e2e-node tests may use custom system specs for validating nodes to
conform the specs. The functionality is switched on when the tests
are run with this command:

    make SYSTEM_SPEC_NAME=gke test-e2e-node

Currently the command fails with the error:

    F1228 16:12:41.568836   34514 e2e_node_suite_test.go:106] Failed to load system spec: open /home/rojkov/go/src/k8s.io/kubernetes/k8s.io/kubernetes/cmd/kubeadm/app/util/system/specs/gke.yaml: no such file or directory

Move the spec file under `test/e2e_node/system/specs` and introduce a single
public constant referring the file to use instead of multiple private constants.

test/e2e_node/BUILD

@@ -204,6 +204,7 @@ filegroup(
         "//test/e2e_node/runner/local:all-srcs",
         "//test/e2e_node/runner/remote:all-srcs",
         "//test/e2e_node/services:all-srcs",
+        "//test/e2e_node/system:all-srcs",
     ],
     tags = ["automanaged"],
     visibility = ["//visibility:public"],

test/e2e_node/remote/BUILD

@@ -20,6 +20,7 @@ go_library(
     deps = [
         "//staging/src/k8s.io/apimachinery/pkg/util/errors:go_default_library",
         "//test/e2e_node/builder:go_default_library",
+        "//test/e2e_node/system:go_default_library",
         "//test/utils:go_default_library",
         "//vendor/k8s.io/klog:go_default_library",
     ],

test/e2e_node/remote/node_e2e.go

@@ -27,13 +27,10 @@ import (
 	"k8s.io/klog"
 
 	"k8s.io/kubernetes/test/e2e_node/builder"
+	"k8s.io/kubernetes/test/e2e_node/system"
 	"k8s.io/kubernetes/test/utils"
 )
 
-const (
-	systemSpecPath = "k8s.io/kubernetes/cmd/kubeadm/app/util/system/specs"
-)
-
 // NodeE2ERemote contains the specific functions in the node e2e test suite.
 type NodeE2ERemote struct{}
 
@@ -75,7 +72,7 @@ func (n *NodeE2ERemote) SetupTestPackage(tardir, systemSpecName string) error {
 
 	if systemSpecName != "" {
 		// Copy system spec file
-		source := filepath.Join(rootDir, systemSpecPath, systemSpecName+".yaml")
+		source := filepath.Join(rootDir, system.SystemSpecPath, systemSpecName+".yaml")
 		if _, err := os.Stat(source); err != nil {
 			return fmt.Errorf("failed to locate system spec %q: %v", source, err)
 		}

test/e2e_node/runner/local/BUILD

@@ -17,6 +17,7 @@ go_library(
     importpath = "k8s.io/kubernetes/test/e2e_node/runner/local",
     deps = [
         "//test/e2e_node/builder:go_default_library",
+        "//test/e2e_node/system:go_default_library",
         "//test/utils:go_default_library",
         "//vendor/k8s.io/klog:go_default_library",
     ],

test/e2e_node/runner/local/run_local.go

@@ -25,6 +25,7 @@ import (
 	"strings"
 
 	"k8s.io/kubernetes/test/e2e_node/builder"
+	"k8s.io/kubernetes/test/e2e_node/system"
 	"k8s.io/kubernetes/test/utils"
 
 	"k8s.io/klog"
@@ -33,11 +34,7 @@ import (
 var buildDependencies = flag.Bool("build-dependencies", true, "If true, build all dependencies.")
 var ginkgoFlags = flag.String("ginkgo-flags", "", "Space-separated list of arguments to pass to Ginkgo test runner.")
 var testFlags = flag.String("test-flags", "", "Space-separated list of arguments to pass to node e2e test.")
-var systemSpecName = flag.String("system-spec-name", "", "The name of the system spec used for validating the image in the node conformance test. The specs are at k8s.io/kubernetes/cmd/kubeadm/app/util/system/specs/. If unspecified, the default built-in spec (system.DefaultSpec) will be used.")
-
-const (
-	systemSpecPath = "k8s.io/kubernetes/cmd/kubeadm/app/util/system/specs"
-)
+var systemSpecName = flag.String("system-spec-name", "", fmt.Sprintf("The name of the system spec used for validating the image in the node conformance test. The specs are at %s. If unspecified, the default built-in spec (system.DefaultSpec) will be used.", system.SystemSpecPath))
 
 func main() {
 	klog.InitFlags(nil)
@@ -65,7 +62,7 @@ func main() {
 		if err != nil {
 			klog.Fatalf("Failed to get k8s root directory: %v", err)
 		}
-		systemSpecFile := filepath.Join(rootDir, systemSpecPath, *systemSpecName+".yaml")
+		systemSpecFile := filepath.Join(rootDir, system.SystemSpecPath, *systemSpecName+".yaml")
 		args = append(args, fmt.Sprintf("--system-spec-name=%s --system-spec-file=%s", *systemSpecName, systemSpecFile))
 	}
 	if err := runCommand(ginkgo, args...); err != nil {

test/e2e_node/runner/remote/BUILD

@@ -17,6 +17,7 @@ go_library(
     importpath = "k8s.io/kubernetes/test/e2e_node/runner/remote",
     deps = [
         "//test/e2e_node/remote:go_default_library",
+        "//test/e2e_node/system:go_default_library",
         "//vendor/github.com/pborman/uuid:go_default_library",
         "//vendor/golang.org/x/oauth2:go_default_library",
         "//vendor/golang.org/x/oauth2/google:go_default_library",

test/e2e_node/runner/remote/run_remote.go

@@ -36,6 +36,7 @@ import (
 	"time"
 
 	"k8s.io/kubernetes/test/e2e_node/remote"
+	"k8s.io/kubernetes/test/e2e_node/system"
 
 	"github.com/pborman/uuid"
 	"golang.org/x/oauth2"
@@ -61,7 +62,7 @@ var buildOnly = flag.Bool("build-only", false, "If true, build e2e_node_test.tar
 var instanceMetadata = flag.String("instance-metadata", "", "key/value metadata for instances separated by '=' or '<', 'k=v' means the key is 'k' and the value is 'v'; 'k<p' means the key is 'k' and the value is extracted from the local path 'p', e.g. k1=v1,k2<p2")
 var gubernator = flag.Bool("gubernator", false, "If true, output Gubernator link to view logs")
 var ginkgoFlags = flag.String("ginkgo-flags", "", "Passed to ginkgo to specify additional flags such as --skip=.")
-var systemSpecName = flag.String("system-spec-name", "", "The name of the system spec used for validating the image in the node conformance test. The specs are at k8s.io/kubernetes/cmd/kubeadm/app/util/system/specs/. If unspecified, the default built-in spec (system.DefaultSpec) will be used.")
+var systemSpecName = flag.String("system-spec-name", "", fmt.Sprintf("The name of the system spec used for validating the image in the node conformance test. The specs are at %s. If unspecified, the default built-in spec (system.DefaultSpec) will be used.", system.SystemSpecPath))
 
 // envs is the type used to collect all node envs. The key is the env name,
 // and the value is the env value

test/e2e_node/system/BUILD

@@ -0,0 +1,22 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["specs.go"],
+    importpath = "k8s.io/kubernetes/test/e2e_node/system",
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

test/e2e_node/system/specs.go

@@ -0,0 +1,22 @@
+/*
+Copyright 2019 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 system
+
+const (
+	// SystemSpecPath is a path to spec files used for performing node conformance tests.
+	SystemSpecPath = "test/e2e_node/system/specs"
+)