Move container manager into a separate package.

Inject container manager into Kubelet. This lets us stub out container
manager during integration testing.

pkg/kubelet/cm/container_manager_linux_test.go

@@ -0,0 +1,125 @@
+// +build linux
+
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 cm
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"k8s.io/kubernetes/pkg/util/mount"
+)
+
+type fakeMountInterface struct {
+	mountPoints []mount.MountPoint
+}
+
+func (mi *fakeMountInterface) Mount(source string, target string, fstype string, options []string) error {
+	return fmt.Errorf("unsupported")
+}
+
+func (mi *fakeMountInterface) Unmount(target string) error {
+	return fmt.Errorf("unsupported")
+}
+
+func (mi *fakeMountInterface) List() ([]mount.MountPoint, error) {
+	return mi.mountPoints, nil
+}
+
+func (mi *fakeMountInterface) IsLikelyNotMountPoint(file string) (bool, error) {
+	return false, fmt.Errorf("unsupported")
+}
+
+func fakeContainerMgrMountInt() mount.Interface {
+	return &fakeMountInterface{
+		[]mount.MountPoint{
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuset"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpu"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuacct"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "memory"},
+			},
+		},
+	}
+}
+
+func TestCgroupMountValidationSuccess(t *testing.T) {
+	assert.Nil(t, validateSystemRequirements(fakeContainerMgrMountInt()))
+}
+
+func TestCgroupMountValidationMemoryMissing(t *testing.T) {
+	mountInt := &fakeMountInterface{
+		[]mount.MountPoint{
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuset"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpu"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuacct"},
+			},
+		},
+	}
+	assert.Error(t, validateSystemRequirements(mountInt))
+}
+
+func TestCgroupMountValidationMultipleSubsytem(t *testing.T) {
+	mountInt := &fakeMountInterface{
+		[]mount.MountPoint{
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuset", "memory"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpu"},
+			},
+			{
+				Device: "cgroup",
+				Type:   "cgroup",
+				Opts:   []string{"rw", "relatime", "cpuacct"},
+			},
+		},
+	}
+	assert.Nil(t, validateSystemRequirements(mountInt))
+}