be7da5052f
This patch refactors pkg/util/mount to be more usable outside of Kubernetes. This is done by refactoring mount.Interface to only contain methods that are not K8s specific. Methods that are not relevant to basic mount activities but still have OS-specific implementations are now found in a mount.HostUtils interface.
404 lines
11 KiB
Go
404 lines
11 KiB
Go
// +build linux
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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"k8s.io/api/core/v1"
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runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
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_ "k8s.io/kubernetes/pkg/apis/core/install"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/util/mount"
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volumetest "k8s.io/kubernetes/pkg/volume/testing"
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"k8s.io/kubernetes/pkg/volume/util/subpath"
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)
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func TestMakeMounts(t *testing.T) {
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bTrue := true
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propagationHostToContainer := v1.MountPropagationHostToContainer
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propagationBidirectional := v1.MountPropagationBidirectional
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propagationNone := v1.MountPropagationNone
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testCases := map[string]struct {
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container v1.Container
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podVolumes kubecontainer.VolumeMap
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expectErr bool
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expectedErrMsg string
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expectedMounts []kubecontainer.Mount
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}{
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"valid mounts in unprivileged container": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/disk"}},
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"disk4": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/host"}},
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"disk5": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/var/lib/kubelet/podID/volumes/empty/disk5"}},
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},
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container: v1.Container{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/etc/hosts",
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Name: "disk",
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ReadOnly: false,
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MountPropagation: &propagationHostToContainer,
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},
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{
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MountPath: "/mnt/path3",
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Name: "disk",
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ReadOnly: true,
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MountPropagation: &propagationNone,
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},
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{
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MountPath: "/mnt/path4",
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Name: "disk4",
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ReadOnly: false,
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},
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{
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MountPath: "/mnt/path5",
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Name: "disk5",
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ReadOnly: false,
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},
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},
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},
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expectedMounts: []kubecontainer.Mount{
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{
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Name: "disk",
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ContainerPath: "/etc/hosts",
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HostPath: "/mnt/disk",
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ReadOnly: false,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_HOST_TO_CONTAINER,
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},
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{
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Name: "disk",
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ContainerPath: "/mnt/path3",
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HostPath: "/mnt/disk",
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ReadOnly: true,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_PRIVATE,
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},
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{
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Name: "disk4",
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ContainerPath: "/mnt/path4",
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HostPath: "/mnt/host",
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ReadOnly: false,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_PRIVATE,
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},
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{
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Name: "disk5",
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ContainerPath: "/mnt/path5",
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HostPath: "/var/lib/kubelet/podID/volumes/empty/disk5",
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ReadOnly: false,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_PRIVATE,
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},
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},
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expectErr: false,
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},
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"valid mounts in privileged container": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/disk"}},
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"disk4": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/host"}},
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"disk5": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/var/lib/kubelet/podID/volumes/empty/disk5"}},
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},
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container: v1.Container{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/etc/hosts",
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Name: "disk",
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ReadOnly: false,
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MountPropagation: &propagationBidirectional,
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},
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{
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MountPath: "/mnt/path3",
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Name: "disk",
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ReadOnly: true,
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MountPropagation: &propagationHostToContainer,
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},
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{
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MountPath: "/mnt/path4",
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Name: "disk4",
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ReadOnly: false,
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},
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},
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SecurityContext: &v1.SecurityContext{
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Privileged: &bTrue,
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},
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},
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expectedMounts: []kubecontainer.Mount{
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{
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Name: "disk",
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ContainerPath: "/etc/hosts",
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HostPath: "/mnt/disk",
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ReadOnly: false,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_BIDIRECTIONAL,
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},
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{
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Name: "disk",
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ContainerPath: "/mnt/path3",
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HostPath: "/mnt/disk",
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ReadOnly: true,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_HOST_TO_CONTAINER,
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},
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{
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Name: "disk4",
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ContainerPath: "/mnt/path4",
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HostPath: "/mnt/host",
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ReadOnly: false,
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SELinuxRelabel: false,
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Propagation: runtimeapi.MountPropagation_PROPAGATION_PRIVATE,
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},
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},
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expectErr: false,
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},
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"invalid absolute SubPath": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/disk"}},
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},
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container: v1.Container{
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/mnt/path3",
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SubPath: "/must/not/be/absolute",
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Name: "disk",
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ReadOnly: true,
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "error SubPath `/must/not/be/absolute` must not be an absolute path",
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},
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"invalid SubPath with backsteps": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{Mounter: &stubVolume{path: "/mnt/disk"}},
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},
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container: v1.Container{
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/mnt/path3",
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SubPath: "no/backsteps/../allowed",
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Name: "disk",
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ReadOnly: true,
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "unable to provision SubPath `no/backsteps/../allowed`: must not contain '..'",
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},
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"volume doesn't exist": {
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podVolumes: kubecontainer.VolumeMap{},
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container: v1.Container{
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/mnt/path3",
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Name: "disk",
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ReadOnly: true,
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "cannot find volume \"disk\" to mount into container \"\"",
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},
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"volume mounter is nil": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{},
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},
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container: v1.Container{
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VolumeMounts: []v1.VolumeMount{
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{
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MountPath: "/mnt/path3",
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Name: "disk",
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ReadOnly: true,
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "cannot find volume \"disk\" to mount into container \"\"",
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},
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}
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for name, tc := range testCases {
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t.Run(name, func(t *testing.T) {
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fhu := &mount.FakeHostUtil{}
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fsp := &subpath.FakeSubpath{}
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pod := v1.Pod{
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Spec: v1.PodSpec{
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HostNetwork: true,
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},
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}
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mounts, _, err := makeMounts(&pod, "/pod", &tc.container, "fakepodname", "", "", tc.podVolumes, fhu, fsp, nil)
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// validate only the error if we expect an error
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if tc.expectErr {
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if err == nil || err.Error() != tc.expectedErrMsg {
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t.Fatalf("expected error message `%s` but got `%v`", tc.expectedErrMsg, err)
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}
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return
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}
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// otherwise validate the mounts
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if err != nil {
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t.Fatal(err)
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}
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assert.Equal(t, tc.expectedMounts, mounts, "mounts of container %+v", tc.container)
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})
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}
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}
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func TestMakeBlockVolumes(t *testing.T) {
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testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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testCases := map[string]struct {
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container v1.Container
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podVolumes kubecontainer.VolumeMap
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expectErr bool
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expectedErrMsg string
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expectedDevices []kubecontainer.DeviceInfo
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}{
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"valid volumeDevices in container": {
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podVolumes: kubecontainer.VolumeMap{
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"disk1": kubecontainer.VolumeInfo{BlockVolumeMapper: &stubBlockVolume{dirPath: "/dev/", volName: "sda"}},
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"disk2": kubecontainer.VolumeInfo{BlockVolumeMapper: &stubBlockVolume{dirPath: "/dev/disk/by-path/", volName: "diskPath"}, ReadOnly: true},
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"disk3": kubecontainer.VolumeInfo{BlockVolumeMapper: &stubBlockVolume{dirPath: "/dev/disk/by-id/", volName: "diskUuid"}},
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"disk4": kubecontainer.VolumeInfo{BlockVolumeMapper: &stubBlockVolume{dirPath: "/var/lib/", volName: "rawdisk"}, ReadOnly: true},
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},
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container: v1.Container{
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Name: "container1",
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VolumeDevices: []v1.VolumeDevice{
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{
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DevicePath: "/dev/sda",
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Name: "disk1",
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},
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{
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DevicePath: "/dev/xvda",
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Name: "disk2",
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},
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{
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DevicePath: "/dev/xvdb",
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Name: "disk3",
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},
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{
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DevicePath: "/mnt/rawdisk",
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Name: "disk4",
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},
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},
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},
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expectedDevices: []kubecontainer.DeviceInfo{
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{
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PathInContainer: "/dev/sda",
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PathOnHost: "/dev/sda",
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Permissions: "mrw",
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},
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{
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PathInContainer: "/dev/xvda",
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PathOnHost: "/dev/disk/by-path/diskPath",
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Permissions: "r",
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},
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{
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PathInContainer: "/dev/xvdb",
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PathOnHost: "/dev/disk/by-id/diskUuid",
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Permissions: "mrw",
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},
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{
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PathInContainer: "/mnt/rawdisk",
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PathOnHost: "/var/lib/rawdisk",
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Permissions: "r",
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},
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},
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expectErr: false,
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},
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"invalid absolute Path": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{BlockVolumeMapper: &stubBlockVolume{dirPath: "/dev/", volName: "sda"}},
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},
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container: v1.Container{
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VolumeDevices: []v1.VolumeDevice{
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{
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DevicePath: "must/be/absolute",
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Name: "disk",
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "error DevicePath `must/be/absolute` must be an absolute path",
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},
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"volume doesn't exist": {
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podVolumes: kubecontainer.VolumeMap{},
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container: v1.Container{
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VolumeDevices: []v1.VolumeDevice{
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{
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DevicePath: "/dev/sdaa",
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Name: "disk",
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "cannot find volume \"disk\" to pass into container \"\"",
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},
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"volume BlockVolumeMapper is nil": {
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podVolumes: kubecontainer.VolumeMap{
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"disk": kubecontainer.VolumeInfo{},
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},
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container: v1.Container{
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VolumeDevices: []v1.VolumeDevice{
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{
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DevicePath: "/dev/sdzz",
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Name: "disk",
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},
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},
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},
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expectErr: true,
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expectedErrMsg: "cannot find volume \"disk\" to pass into container \"\"",
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},
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}
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for name, tc := range testCases {
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t.Run(name, func(t *testing.T) {
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pod := v1.Pod{
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Spec: v1.PodSpec{
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HostNetwork: true,
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},
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}
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blkutil := volumetest.NewBlockVolumePathHandler()
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blkVolumes, err := kubelet.makeBlockVolumes(&pod, &tc.container, tc.podVolumes, blkutil)
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// validate only the error if we expect an error
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if tc.expectErr {
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if err == nil || err.Error() != tc.expectedErrMsg {
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t.Fatalf("expected error message `%s` but got `%v`", tc.expectedErrMsg, err)
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}
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return
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}
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// otherwise validate the devices
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if err != nil {
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t.Fatal(err)
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}
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assert.Equal(t, tc.expectedDevices, blkVolumes, "devices of container %+v", tc.container)
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})
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}
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}
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