Move all staticpod utils to separate package

cmd/kubeadm/app/util/staticpod/utils.go

@@ -0,0 +1,137 @@
+/*
+Copyright 2017 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 staticpod
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/ghodss/yaml"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
+	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
+)
+
+// ComponentPod returns a Pod object from the container and volume specifications
+func ComponentPod(container v1.Container, volumes []v1.Volume) v1.Pod {
+	return v1.Pod{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "v1",
+			Kind:       "Pod",
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:        container.Name,
+			Namespace:   metav1.NamespaceSystem,
+			Annotations: map[string]string{kubetypes.CriticalPodAnnotationKey: ""},
+		},
+		Spec: v1.PodSpec{
+			Containers:  []v1.Container{container},
+			HostNetwork: true,
+			Volumes:     volumes,
+		},
+	}
+}
+
+// ComponentResources returns the v1.ResourceRequirements object needed for allocating a specified amount of the CPU
+func ComponentResources(cpu string) v1.ResourceRequirements {
+	return v1.ResourceRequirements{
+		Requests: v1.ResourceList{
+			v1.ResourceName(v1.ResourceCPU): resource.MustParse(cpu),
+		},
+	}
+}
+
+// ComponentProbe is a helper function building a ready v1.Probe object from some simple parameters
+func ComponentProbe(port int, path string, scheme v1.URIScheme) *v1.Probe {
+	return &v1.Probe{
+		Handler: v1.Handler{
+			HTTPGet: &v1.HTTPGetAction{
+				// Host has to be set to "127.0.0.1" here due to that our static Pods are on the host's network
+				Host:   "127.0.0.1",
+				Path:   path,
+				Port:   intstr.FromInt(port),
+				Scheme: scheme,
+			},
+		},
+		InitialDelaySeconds: 15,
+		TimeoutSeconds:      15,
+		FailureThreshold:    8,
+	}
+}
+
+// NewVolume creates a v1.Volume with a hostPath mount to the specified location
+func NewVolume(name, path string) v1.Volume {
+	return v1.Volume{
+		Name: name,
+		VolumeSource: v1.VolumeSource{
+			HostPath: &v1.HostPathVolumeSource{Path: path},
+		},
+	}
+}
+
+// NewVolumeMount creates a v1.VolumeMount to the specified location
+func NewVolumeMount(name, path string, readOnly bool) v1.VolumeMount {
+	return v1.VolumeMount{
+		Name:      name,
+		MountPath: path,
+		ReadOnly:  readOnly,
+	}
+}
+
+// GetExtraParameters builds a list of flag arguments two string-string maps, one with default, base commands and one with overrides
+func GetExtraParameters(overrides map[string]string, defaults map[string]string) []string {
+	var command []string
+	for k, v := range overrides {
+		if len(v) > 0 {
+			command = append(command, fmt.Sprintf("--%s=%s", k, v))
+		}
+	}
+	for k, v := range defaults {
+		if _, overrideExists := overrides[k]; !overrideExists {
+			command = append(command, fmt.Sprintf("--%s=%s", k, v))
+		}
+	}
+	return command
+}
+
+// WriteStaticPodToDisk writes a static pod file to disk
+func WriteStaticPodToDisk(componentName, manifestDir string, pod v1.Pod) error {
+
+	// creates target folder if not already exists
+	if err := os.MkdirAll(manifestDir, 0700); err != nil {
+		return fmt.Errorf("failed to create directory %q: %v", manifestDir, err)
+	}
+
+	// writes the pod to disk
+	serialized, err := yaml.Marshal(pod)
+	if err != nil {
+		return fmt.Errorf("failed to marshal manifest for %q to YAML: %v", componentName, err)
+	}
+
+	filename := kubeadmconstants.GetStaticPodFilepath(componentName, manifestDir)
+
+	if err := ioutil.WriteFile(filename, serialized, 0700); err != nil {
+		return fmt.Errorf("failed to write static pod manifest file for %q (%q): %v", componentName, filename, err)
+	}
+
+	return nil
+}

cmd/kubeadm/app/util/staticpod/utils_test.go

@@ -0,0 +1,219 @@
+/*
+Copyright 2017 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 staticpod
+
+import (
+	"reflect"
+	"sort"
+	"testing"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+)
+
+func TestComponentResources(t *testing.T) {
+	a := ComponentResources("250m")
+	if a.Requests == nil {
+		t.Errorf(
+			"failed componentResources, return value was nil",
+		)
+	}
+}
+
+func TestComponentProbe(t *testing.T) {
+	var tests = []struct {
+		port   int
+		path   string
+		scheme v1.URIScheme
+	}{
+		{
+			port:   1,
+			path:   "foo",
+			scheme: v1.URISchemeHTTP,
+		},
+		{
+			port:   2,
+			path:   "bar",
+			scheme: v1.URISchemeHTTPS,
+		},
+	}
+	for _, rt := range tests {
+		actual := ComponentProbe(rt.port, rt.path, rt.scheme)
+		if actual.Handler.HTTPGet.Port != intstr.FromInt(rt.port) {
+			t.Errorf(
+				"failed componentProbe:\n\texpected: %v\n\t  actual: %v",
+				rt.port,
+				actual.Handler.HTTPGet.Port,
+			)
+		}
+		if actual.Handler.HTTPGet.Path != rt.path {
+			t.Errorf(
+				"failed componentProbe:\n\texpected: %s\n\t  actual: %s",
+				rt.path,
+				actual.Handler.HTTPGet.Path,
+			)
+		}
+		if actual.Handler.HTTPGet.Scheme != rt.scheme {
+			t.Errorf(
+				"failed componentProbe:\n\texpected: %v\n\t  actual: %v",
+				rt.scheme,
+				actual.Handler.HTTPGet.Scheme,
+			)
+		}
+	}
+}
+
+func TestComponentPod(t *testing.T) {
+	var tests = []struct {
+		n string
+	}{
+		{
+			n: "foo",
+		},
+	}
+
+	for _, rt := range tests {
+		c := v1.Container{Name: rt.n}
+		v := []v1.Volume{}
+		actual := ComponentPod(c, v)
+		if actual.ObjectMeta.Name != rt.n {
+			t.Errorf(
+				"failed componentPod:\n\texpected: %s\n\t  actual: %s",
+				rt.n,
+				actual.ObjectMeta.Name,
+			)
+		}
+	}
+}
+
+func TestNewVolume(t *testing.T) {
+	var tests = []struct {
+		name     string
+		path     string
+		expected v1.Volume
+	}{
+		{
+			name: "foo",
+			path: "/etc/foo",
+			expected: v1.Volume{
+				Name: "foo",
+				VolumeSource: v1.VolumeSource{
+					HostPath: &v1.HostPathVolumeSource{Path: "/etc/foo"},
+				},
+			},
+		},
+	}
+
+	for _, rt := range tests {
+		actual := NewVolume(rt.name, rt.path)
+		if !reflect.DeepEqual(actual, rt.expected) {
+			t.Errorf(
+				"failed newVolume:\n\texpected: %v\n\t  actual: %v",
+				rt.expected,
+				actual,
+			)
+		}
+	}
+}
+
+func TestNewVolumeMount(t *testing.T) {
+	var tests = []struct {
+		name     string
+		path     string
+		ro       bool
+		expected v1.VolumeMount
+	}{
+		{
+			name: "foo",
+			path: "/etc/foo",
+			ro:   false,
+			expected: v1.VolumeMount{
+				Name:      "foo",
+				MountPath: "/etc/foo",
+				ReadOnly:  false,
+			},
+		},
+		{
+			name: "bar",
+			path: "/etc/foo/bar",
+			ro:   true,
+			expected: v1.VolumeMount{
+				Name:      "bar",
+				MountPath: "/etc/foo/bar",
+				ReadOnly:  true,
+			},
+		},
+	}
+
+	for _, rt := range tests {
+		actual := NewVolumeMount(rt.name, rt.path, rt.ro)
+		if !reflect.DeepEqual(actual, rt.expected) {
+			t.Errorf(
+				"failed newVolumeMount:\n\texpected: %v\n\t  actual: %v",
+				rt.expected,
+				actual,
+			)
+		}
+	}
+}
+
+func TestGetExtraParameters(t *testing.T) {
+	var tests = []struct {
+		overrides map[string]string
+		defaults  map[string]string
+		expected  []string
+	}{
+		{
+			overrides: map[string]string{
+				"admission-control": "NamespaceLifecycle,LimitRanger",
+			},
+			defaults: map[string]string{
+				"admission-control":     "NamespaceLifecycle",
+				"insecure-bind-address": "127.0.0.1",
+				"allow-privileged":      "true",
+			},
+			expected: []string{
+				"--admission-control=NamespaceLifecycle,LimitRanger",
+				"--insecure-bind-address=127.0.0.1",
+				"--allow-privileged=true",
+			},
+		},
+		{
+			overrides: map[string]string{
+				"admission-control": "NamespaceLifecycle,LimitRanger",
+			},
+			defaults: map[string]string{
+				"insecure-bind-address": "127.0.0.1",
+				"allow-privileged":      "true",
+			},
+			expected: []string{
+				"--admission-control=NamespaceLifecycle,LimitRanger",
+				"--insecure-bind-address=127.0.0.1",
+				"--allow-privileged=true",
+			},
+		},
+	}
+
+	for _, rt := range tests {
+		actual := GetExtraParameters(rt.overrides, rt.defaults)
+		sort.Strings(actual)
+		sort.Strings(rt.expected)
+		if !reflect.DeepEqual(actual, rt.expected) {
+			t.Errorf("failed getExtraParameters:\nexpected:\n%v\nsaw:\n%v", rt.expected, actual)
+		}
+	}
+}