Update godeps

vendor/k8s.io/kubernetes/pkg/util/mount/BUILD

@@ -0,0 +1,39 @@
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_binary",
+    "go_library",
+    "go_test",
+    "cgo_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "doc.go",
+        "fake.go",
+        "mount.go",
+        "mount_linux.go",
+        "nsenter_mount.go",
+    ],
+    tags = ["automanaged"],
+    deps = [
+        "//pkg/util/exec:go_default_library",
+        "//pkg/util/sets:go_default_library",
+        "//vendor:github.com/golang/glog",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "mount_linux_test.go",
+        "safe_format_and_mount_test.go",
+    ],
+    library = "go_default_library",
+    tags = ["automanaged"],
+    deps = ["//pkg/util/exec:go_default_library"],
+)

vendor/k8s.io/kubernetes/pkg/util/mount/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2014 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 mount defines an interface to mounting filesystems.
+package mount

vendor/k8s.io/kubernetes/pkg/util/mount/fake.go

@@ -0,0 +1,146 @@
+/*
+Copyright 2015 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 mount
+
+import (
+	"sync"
+
+	"github.com/golang/glog"
+)
+
+// FakeMounter implements mount.Interface for tests.
+type FakeMounter struct {
+	MountPoints []MountPoint
+	Log         []FakeAction
+	// Some tests run things in parallel, make sure the mounter does not produce
+	// any golang's DATA RACE warnings.
+	mutex sync.Mutex
+}
+
+var _ Interface = &FakeMounter{}
+
+// Values for FakeAction.Action
+const FakeActionMount = "mount"
+const FakeActionUnmount = "unmount"
+
+// FakeAction objects are logged every time a fake mount or unmount is called.
+type FakeAction struct {
+	Action string // "mount" or "unmount"
+	Target string // applies to both mount and unmount actions
+	Source string // applies only to "mount" actions
+	FSType string // applies only to "mount" actions
+}
+
+func (f *FakeMounter) ResetLog() {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	f.Log = []FakeAction{}
+}
+
+func (f *FakeMounter) Mount(source string, target string, fstype string, options []string) error {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	// find 'bind' option
+	for _, option := range options {
+		if option == "bind" {
+			// This is a bind-mount. In order to mimic linux behaviour, we must
+			// use the original device of the bind-mount as the real source.
+			// E.g. when mounted /dev/sda like this:
+			//      $ mount /dev/sda /mnt/test
+			//      $ mount -o bind /mnt/test /mnt/bound
+			// then /proc/mount contains:
+			// /dev/sda /mnt/test
+			// /dev/sda /mnt/bound
+			// (and not /mnt/test /mnt/bound)
+			// I.e. we must use /dev/sda as source instead of /mnt/test in the
+			// bind mount.
+			for _, mnt := range f.MountPoints {
+				if source == mnt.Path {
+					source = mnt.Device
+					break
+				}
+			}
+			break
+		}
+	}
+
+	f.MountPoints = append(f.MountPoints, MountPoint{Device: source, Path: target, Type: fstype})
+	glog.V(5).Infof("Fake mounter: mounted %s to %s", source, target)
+	f.Log = append(f.Log, FakeAction{Action: FakeActionMount, Target: target, Source: source, FSType: fstype})
+	return nil
+}
+
+func (f *FakeMounter) Unmount(target string) error {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	newMountpoints := []MountPoint{}
+	for _, mp := range f.MountPoints {
+		if mp.Path == target {
+			glog.V(5).Infof("Fake mounter: unmounted %s from %s", mp.Device, target)
+			// Don't copy it to newMountpoints
+			continue
+		}
+		newMountpoints = append(newMountpoints, MountPoint{Device: mp.Device, Path: mp.Path, Type: mp.Type})
+	}
+	f.MountPoints = newMountpoints
+	f.Log = append(f.Log, FakeAction{Action: FakeActionUnmount, Target: target})
+	return nil
+}
+
+func (f *FakeMounter) List() ([]MountPoint, error) {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	return f.MountPoints, nil
+}
+
+func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	for _, mp := range f.MountPoints {
+		if mp.Path == file {
+			glog.V(5).Infof("isLikelyMountPoint for %s: mounted %s, false", file, mp.Path)
+			return false, nil
+		}
+	}
+	glog.V(5).Infof("isLikelyMountPoint for %s: true", file)
+	return true, nil
+}
+
+func (f *FakeMounter) DeviceOpened(pathname string) (bool, error) {
+	f.mutex.Lock()
+	defer f.mutex.Unlock()
+
+	for _, mp := range f.MountPoints {
+		if mp.Device == pathname {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func (f *FakeMounter) PathIsDevice(pathname string) (bool, error) {
+	return true, nil
+}
+
+func (f *FakeMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
+	return getDeviceNameFromMount(f, mountPath, pluginDir)
+}

vendor/k8s.io/kubernetes/pkg/util/mount/mount.go

@@ -0,0 +1,199 @@
+/*
+Copyright 2014 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.
+*/
+
+// TODO(thockin): This whole pkg is pretty linux-centric.  As soon as we have
+// an alternate platform, we will need to abstract further.
+package mount
+
+import (
+	"fmt"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/util/exec"
+)
+
+const (
+	// Default mount command if mounter path is not specified
+	defaultMountCommand = "mount"
+)
+
+type Interface interface {
+	// Mount mounts source to target as fstype with given options.
+	Mount(source string, target string, fstype string, options []string) error
+	// Unmount unmounts given target.
+	Unmount(target string) error
+	// List returns a list of all mounted filesystems.  This can be large.
+	// On some platforms, reading mounts is not guaranteed consistent (i.e.
+	// it could change between chunked reads). This is guaranteed to be
+	// consistent.
+	List() ([]MountPoint, error)
+	// IsLikelyNotMountPoint determines if a directory is a mountpoint.
+	// It should return ErrNotExist when the directory does not exist.
+	IsLikelyNotMountPoint(file string) (bool, error)
+	// DeviceOpened determines if the device is in use elsewhere
+	// on the system, i.e. still mounted.
+	DeviceOpened(pathname string) (bool, error)
+	// PathIsDevice determines if a path is a device.
+	PathIsDevice(pathname string) (bool, error)
+	// GetDeviceNameFromMount finds the device name by checking the mount path
+	// to get the global mount path which matches its plugin directory
+	GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
+}
+
+// Compile-time check to ensure all Mounter implementations satisfy
+// the mount interface
+var _ Interface = &Mounter{}
+
+// This represents a single line in /proc/mounts or /etc/fstab.
+type MountPoint struct {
+	Device string
+	Path   string
+	Type   string
+	Opts   []string
+	Freq   int
+	Pass   int
+}
+
+// SafeFormatAndMount probes a device to see if it is formatted.
+// Namely it checks to see if a file system is present. If so it
+// mounts it otherwise the device is formatted first then mounted.
+type SafeFormatAndMount struct {
+	Interface
+	Runner exec.Interface
+}
+
+// FormatAndMount formats the given disk, if needed, and mounts it.
+// That is if the disk is not formatted and it is not being mounted as
+// read-only it will format it first then mount it. Otherwise, if the
+// disk is already formatted or it is being mounted as read-only, it
+// will be mounted without formatting.
+func (mounter *SafeFormatAndMount) FormatAndMount(source string, target string, fstype string, options []string) error {
+	// Don't attempt to format if mounting as readonly. Go straight to mounting.
+	for _, option := range options {
+		if option == "ro" {
+			return mounter.Interface.Mount(source, target, fstype, options)
+		}
+	}
+	return mounter.formatAndMount(source, target, fstype, options)
+}
+
+// New returns a mount.Interface for the current system.
+// It provides options to override the default mounter behavior.
+// mounterPath allows using an alternative to `/bin/mount` for mounting.
+func New(mounterPath string) Interface {
+	// If mounter-path flag is not set, use default mount path
+	if mounterPath == "" {
+		mounterPath = defaultMountCommand
+	}
+
+	return &Mounter{
+		mounterPath: mounterPath,
+	}
+}
+
+// GetMountRefs finds all other references to the device referenced
+// by mountPath; returns a list of paths.
+func GetMountRefs(mounter Interface, mountPath string) ([]string, error) {
+	mps, err := mounter.List()
+	if err != nil {
+		return nil, err
+	}
+
+	// Find the device name.
+	deviceName := ""
+	// If mountPath is symlink, need get its target path.
+	slTarget, err := filepath.EvalSymlinks(mountPath)
+	if err != nil {
+		slTarget = mountPath
+	}
+	for i := range mps {
+		if mps[i].Path == slTarget {
+			deviceName = mps[i].Device
+			break
+		}
+	}
+
+	// Find all references to the device.
+	var refs []string
+	if deviceName == "" {
+		glog.Warningf("could not determine device for path: %q", mountPath)
+	} else {
+		for i := range mps {
+			if mps[i].Device == deviceName && mps[i].Path != slTarget {
+				refs = append(refs, mps[i].Path)
+			}
+		}
+	}
+	return refs, nil
+}
+
+// GetDeviceNameFromMount: given a mnt point, find the device from /proc/mounts
+// returns the device name, reference count, and error code
+func GetDeviceNameFromMount(mounter Interface, mountPath string) (string, int, error) {
+	mps, err := mounter.List()
+	if err != nil {
+		return "", 0, err
+	}
+
+	// Find the device name.
+	// FIXME if multiple devices mounted on the same mount path, only the first one is returned
+	device := ""
+	// If mountPath is symlink, need get its target path.
+	slTarget, err := filepath.EvalSymlinks(mountPath)
+	if err != nil {
+		slTarget = mountPath
+	}
+	for i := range mps {
+		if mps[i].Path == slTarget {
+			device = mps[i].Device
+			break
+		}
+	}
+
+	// Find all references to the device.
+	refCount := 0
+	for i := range mps {
+		if mps[i].Device == device {
+			refCount++
+		}
+	}
+	return device, refCount, nil
+}
+
+// getDeviceNameFromMount find the device name from /proc/mounts in which
+// the mount path reference should match the given plugin directory. In case no mount path reference
+// matches, returns the volume name taken from its given mountPath
+func getDeviceNameFromMount(mounter Interface, mountPath, pluginDir string) (string, error) {
+	refs, err := GetMountRefs(mounter, mountPath)
+	if err != nil {
+		glog.V(4).Infof("GetMountRefs failed for mount path %q: %v", mountPath, err)
+		return "", err
+	}
+	if len(refs) == 0 {
+		glog.V(4).Infof("Directory %s is not mounted", mountPath)
+		return "", fmt.Errorf("directory %s is not mounted", mountPath)
+	}
+	for _, ref := range refs {
+		if strings.HasPrefix(ref, pluginDir) {
+			return path.Base(ref), nil
+		}
+	}
+
+	return path.Base(mountPath), nil
+}

vendor/k8s.io/kubernetes/pkg/util/mount/mount_linux.go

@@ -0,0 +1,396 @@
+// +build linux
+
+/*
+Copyright 2014 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 mount
+
+import (
+	"bufio"
+	"fmt"
+	"hash/adler32"
+	"io"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/golang/glog"
+	utilExec "k8s.io/kubernetes/pkg/util/exec"
+	"k8s.io/kubernetes/pkg/util/sets"
+)
+
+const (
+	// How many times to retry for a consistent read of /proc/mounts.
+	maxListTries = 3
+	// Number of fields per line in /proc/mounts as per the fstab man page.
+	expectedNumFieldsPerLine = 6
+	// Location of the mount file to use
+	procMountsPath = "/proc/mounts"
+)
+
+const (
+	// 'fsck' found errors and corrected them
+	fsckErrorsCorrected = 1
+	// 'fsck' found errors but exited without correcting them
+	fsckErrorsUncorrected = 4
+)
+
+// Mounter provides the default implementation of mount.Interface
+// for the linux platform.  This implementation assumes that the
+// kubelet is running in the host's root mount namespace.
+type Mounter struct {
+	mounterPath string
+}
+
+// Mount mounts source to target as fstype with given options. 'source' and 'fstype' must
+// be an emtpy string in case it's not required, e.g. for remount, or for auto filesystem
+// type, where kernel handles fs type for you. The mount 'options' is a list of options,
+// currently come from mount(8), e.g. "ro", "remount", "bind", etc. If no more option is
+// required, call Mount with an empty string list or nil.
+func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
+	// Path to mounter binary. Set to mount accessible via $PATH by default.
+	// All Linux distros are expected to be shipped with a mount utility that an support bind mounts.
+	mounterPath := defaultMountCommand
+	bind, bindRemountOpts := isBind(options)
+	if bind {
+		err := doMount(mounterPath, source, target, fstype, []string{"bind"})
+		if err != nil {
+			return err
+		}
+		return doMount(mounterPath, source, target, fstype, bindRemountOpts)
+	}
+	// These filesystem types are expected to be supported by the mount utility on the host across all Linux distros.
+	var defaultMounterFsTypes = sets.NewString("tmpfs", "ext4", "ext3", "ext2")
+	if !defaultMounterFsTypes.Has(fstype) {
+		mounterPath = mounter.mounterPath
+	}
+	return doMount(mounterPath, source, target, fstype, options)
+}
+
+// isBind detects whether a bind mount is being requested and makes the remount options to
+// use in case of bind mount, due to the fact that bind mount doesn't respect mount options.
+// The list equals:
+//   options - 'bind' + 'remount' (no duplicate)
+func isBind(options []string) (bool, []string) {
+	bindRemountOpts := []string{"remount"}
+	bind := false
+
+	if len(options) != 0 {
+		for _, option := range options {
+			switch option {
+			case "bind":
+				bind = true
+				break
+			case "remount":
+				break
+			default:
+				bindRemountOpts = append(bindRemountOpts, option)
+			}
+		}
+	}
+
+	return bind, bindRemountOpts
+}
+
+// doMount runs the mount command.
+func doMount(mountCmd string, source string, target string, fstype string, options []string) error {
+	glog.V(4).Infof("Mounting %s %s %s %v with command: %q", source, target, fstype, options, mountCmd)
+	mountArgs := makeMountArgs(source, target, fstype, options)
+
+	glog.V(4).Infof("Mounting cmd (%s) with arguments (%s)", mountCmd, mountArgs)
+	command := exec.Command(mountCmd, mountArgs...)
+	output, err := command.CombinedOutput()
+	if err != nil {
+		glog.Errorf("Mount failed: %v\nMounting command: %s\nMounting arguments: %s %s %s %v\nOutput: %s\n", err, mountCmd, source, target, fstype, options, string(output))
+		return fmt.Errorf("mount failed: %v\nMounting command: %s\nMounting arguments: %s %s %s %v\nOutput: %s\n",
+			err, mountCmd, source, target, fstype, options, string(output))
+	}
+	return err
+}
+
+// makeMountArgs makes the arguments to the mount(8) command.
+func makeMountArgs(source, target, fstype string, options []string) []string {
+	// Build mount command as follows:
+	//   mount [-t $fstype] [-o $options] [$source] $target
+	mountArgs := []string{}
+	if len(fstype) > 0 {
+		mountArgs = append(mountArgs, "-t", fstype)
+	}
+	if len(options) > 0 {
+		mountArgs = append(mountArgs, "-o", strings.Join(options, ","))
+	}
+	if len(source) > 0 {
+		mountArgs = append(mountArgs, source)
+	}
+	mountArgs = append(mountArgs, target)
+
+	return mountArgs
+}
+
+// Unmount unmounts the target.
+func (mounter *Mounter) Unmount(target string) error {
+	glog.V(4).Infof("Unmounting %s", target)
+	command := exec.Command("umount", target)
+	output, err := command.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("Unmount failed: %v\nUnmounting arguments: %s\nOutput: %s\n", err, target, string(output))
+	}
+	return nil
+}
+
+// List returns a list of all mounted filesystems.
+func (*Mounter) List() ([]MountPoint, error) {
+	return listProcMounts(procMountsPath)
+}
+
+// IsLikelyNotMountPoint determines if a directory is not a mountpoint.
+// It is fast but not necessarily ALWAYS correct. If the path is in fact
+// a bind mount from one part of a mount to another it will not be detected.
+// mkdir /tmp/a /tmp/b; mount --bin /tmp/a /tmp/b; IsLikelyNotMountPoint("/tmp/b")
+// will return true. When in fact /tmp/b is a mount point. If this situation
+// if of interest to you, don't use this function...
+func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	return IsNotMountPoint(file)
+}
+
+func IsNotMountPoint(file string) (bool, error) {
+	stat, err := os.Stat(file)
+	if err != nil {
+		return true, err
+	}
+	rootStat, err := os.Lstat(file + "/..")
+	if err != nil {
+		return true, err
+	}
+	// If the directory has a different device as parent, then it is a mountpoint.
+	if stat.Sys().(*syscall.Stat_t).Dev != rootStat.Sys().(*syscall.Stat_t).Dev {
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// DeviceOpened checks if block device in use by calling Open with O_EXCL flag.
+// If pathname is not a device, log and return false with nil error.
+// If open returns errno EBUSY, return true with nil error.
+// If open returns nil, return false with nil error.
+// Otherwise, return false with error
+func (mounter *Mounter) DeviceOpened(pathname string) (bool, error) {
+	return exclusiveOpenFailsOnDevice(pathname)
+}
+
+// PathIsDevice uses FileInfo returned from os.Stat to check if path refers
+// to a device.
+func (mounter *Mounter) PathIsDevice(pathname string) (bool, error) {
+	return pathIsDevice(pathname)
+}
+
+func exclusiveOpenFailsOnDevice(pathname string) (bool, error) {
+	isDevice, err := pathIsDevice(pathname)
+	if err != nil {
+		return false, fmt.Errorf(
+			"PathIsDevice failed for path %q: %v",
+			pathname,
+			err)
+	}
+	if !isDevice {
+		glog.Errorf("Path %q is not refering to a device.", pathname)
+		return false, nil
+	}
+	fd, errno := syscall.Open(pathname, syscall.O_RDONLY|syscall.O_EXCL, 0)
+	// If the device is in use, open will return an invalid fd.
+	// When this happens, it is expected that Close will fail and throw an error.
+	defer syscall.Close(fd)
+	if errno == nil {
+		// device not in use
+		return false, nil
+	} else if errno == syscall.EBUSY {
+		// device is in use
+		return true, nil
+	}
+	// error during call to Open
+	return false, errno
+}
+
+func pathIsDevice(pathname string) (bool, error) {
+	finfo, err := os.Stat(pathname)
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	// err in call to os.Stat
+	if err != nil {
+		return false, err
+	}
+	// path refers to a device
+	if finfo.Mode()&os.ModeDevice != 0 {
+		return true, nil
+	}
+	// path does not refer to device
+	return false, nil
+}
+
+//GetDeviceNameFromMount: given a mount point, find the device name from its global mount point
+func (mounter *Mounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
+	return getDeviceNameFromMount(mounter, mountPath, pluginDir)
+}
+
+func listProcMounts(mountFilePath string) ([]MountPoint, error) {
+	hash1, err := readProcMounts(mountFilePath, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	for i := 0; i < maxListTries; i++ {
+		mps := []MountPoint{}
+		hash2, err := readProcMounts(mountFilePath, &mps)
+		if err != nil {
+			return nil, err
+		}
+		if hash1 == hash2 {
+			// Success
+			return mps, nil
+		}
+		hash1 = hash2
+	}
+	return nil, fmt.Errorf("failed to get a consistent snapshot of %v after %d tries", mountFilePath, maxListTries)
+}
+
+// readProcMounts reads the given mountFilePath (normally /proc/mounts) and produces a hash
+// of the contents.  If the out argument is not nil, this fills it with MountPoint structs.
+func readProcMounts(mountFilePath string, out *[]MountPoint) (uint32, error) {
+	file, err := os.Open(mountFilePath)
+	if err != nil {
+		return 0, err
+	}
+	defer file.Close()
+	return readProcMountsFrom(file, out)
+}
+
+func readProcMountsFrom(file io.Reader, out *[]MountPoint) (uint32, error) {
+	hash := adler32.New()
+	scanner := bufio.NewReader(file)
+	for {
+		line, err := scanner.ReadString('\n')
+		if err == io.EOF {
+			break
+		}
+		fields := strings.Fields(line)
+		if len(fields) != expectedNumFieldsPerLine {
+			return 0, fmt.Errorf("wrong number of fields (expected %d, got %d): %s", expectedNumFieldsPerLine, len(fields), line)
+		}
+
+		fmt.Fprintf(hash, "%s", line)
+
+		if out != nil {
+			mp := MountPoint{
+				Device: fields[0],
+				Path:   fields[1],
+				Type:   fields[2],
+				Opts:   strings.Split(fields[3], ","),
+			}
+
+			freq, err := strconv.Atoi(fields[4])
+			if err != nil {
+				return 0, err
+			}
+			mp.Freq = freq
+
+			pass, err := strconv.Atoi(fields[5])
+			if err != nil {
+				return 0, err
+			}
+			mp.Pass = pass
+
+			*out = append(*out, mp)
+		}
+	}
+	return hash.Sum32(), nil
+}
+
+// formatAndMount uses unix utils to format and mount the given disk
+func (mounter *SafeFormatAndMount) formatAndMount(source string, target string, fstype string, options []string) error {
+	options = append(options, "defaults")
+
+	// Run fsck on the disk to fix repairable issues
+	glog.V(4).Infof("Checking for issues with fsck on disk: %s", source)
+	args := []string{"-a", source}
+	cmd := mounter.Runner.Command("fsck", args...)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		ee, isExitError := err.(utilExec.ExitError)
+		switch {
+		case err == utilExec.ErrExecutableNotFound:
+			glog.Warningf("'fsck' not found on system; continuing mount without running 'fsck'.")
+		case isExitError && ee.ExitStatus() == fsckErrorsCorrected:
+			glog.Infof("Device %s has errors which were corrected by fsck.", source)
+		case isExitError && ee.ExitStatus() == fsckErrorsUncorrected:
+			return fmt.Errorf("'fsck' found errors on device %s but could not correct them: %s.", source, string(out))
+		case isExitError && ee.ExitStatus() > fsckErrorsUncorrected:
+			glog.Infof("`fsck` error %s", string(out))
+		}
+	}
+
+	// Try to mount the disk
+	glog.V(4).Infof("Attempting to mount disk: %s %s %s", fstype, source, target)
+	err = mounter.Interface.Mount(source, target, fstype, options)
+	if err != nil {
+		// It is possible that this disk is not formatted. Double check using diskLooksUnformatted
+		notFormatted, err := mounter.diskLooksUnformatted(source)
+		if err == nil && notFormatted {
+			args = []string{source}
+			// Disk is unformatted so format it.
+			// Use 'ext4' as the default
+			if len(fstype) == 0 {
+				fstype = "ext4"
+			}
+			if fstype == "ext4" || fstype == "ext3" {
+				args = []string{"-E", "lazy_itable_init=0,lazy_journal_init=0", "-F", source}
+			}
+			glog.Infof("Disk %q appears to be unformatted, attempting to format as type: %q with options: %v", source, fstype, args)
+			cmd := mounter.Runner.Command("mkfs."+fstype, args...)
+			_, err := cmd.CombinedOutput()
+			if err == nil {
+				// the disk has been formatted successfully try to mount it again.
+				glog.Infof("Disk successfully formatted (mkfs): %s - %s %s", fstype, source, target)
+				return mounter.Interface.Mount(source, target, fstype, options)
+			}
+			glog.Errorf("format of disk %q failed: type:(%q) target:(%q) options:(%q)error:(%v)", source, fstype, target, options, err)
+			return err
+		}
+	}
+	return err
+}
+
+// diskLooksUnformatted uses 'lsblk' to see if the given disk is unformated
+func (mounter *SafeFormatAndMount) diskLooksUnformatted(disk string) (bool, error) {
+	args := []string{"-nd", "-o", "FSTYPE", disk}
+	cmd := mounter.Runner.Command("lsblk", args...)
+	glog.V(4).Infof("Attempting to determine if disk %q is formatted using lsblk with args: (%v)", disk, args)
+	dataOut, err := cmd.CombinedOutput()
+	output := strings.TrimSpace(string(dataOut))
+
+	// TODO (#13212): check if this disk has partitions and return false, and
+	// an error if so.
+
+	if err != nil {
+		glog.Errorf("Could not determine if disk %q is formatted (%v)", disk, err)
+		return false, err
+	}
+
+	return output == "", nil
+}

vendor/k8s.io/kubernetes/pkg/util/mount/mount_unsupported.go

@@ -0,0 +1,63 @@
+// +build !linux
+
+/*
+Copyright 2014 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 mount
+
+type Mounter struct {
+	mounterPath string
+}
+
+func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
+	return nil
+}
+
+func (mounter *Mounter) Unmount(target string) error {
+	return nil
+}
+
+func (mounter *Mounter) List() ([]MountPoint, error) {
+	return []MountPoint{}, nil
+}
+
+func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	return true, nil
+}
+
+func (mounter *Mounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
+	return "", nil
+}
+
+func (mounter *Mounter) DeviceOpened(pathname string) (bool, error) {
+	return false, nil
+}
+
+func (mounter *Mounter) PathIsDevice(pathname string) (bool, error) {
+	return true, nil
+}
+
+func (mounter *SafeFormatAndMount) formatAndMount(source string, target string, fstype string, options []string) error {
+	return nil
+}
+
+func (mounter *SafeFormatAndMount) diskLooksUnformatted(disk string) (bool, error) {
+	return true, nil
+}
+
+func IsNotMountPoint(file string) (bool, error) {
+	return true, nil
+}

vendor/k8s.io/kubernetes/pkg/util/mount/nsenter_mount.go

@@ -0,0 +1,231 @@
+// +build linux
+
+/*
+Copyright 2014 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 mount
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/util/exec"
+)
+
+// NsenterMounter is part of experimental support for running the kubelet
+// in a container.  Currently, all docker containers receive their own mount
+// namespaces.  NsenterMounter works by executing nsenter to run commands in
+// the host's mount namespace.
+//
+// NsenterMounter requires:
+//
+// 1.  Docker >= 1.6 due to the dependency on the slave propagation mode
+//     of the bind-mount of the kubelet root directory in the container.
+//     Docker 1.5 used a private propagation mode for bind-mounts, so mounts
+//     performed in the host's mount namespace do not propagate out to the
+//     bind-mount in this docker version.
+// 2.  The host's root filesystem must be available at /rootfs
+// 3.  The nsenter binary must be on the Kubelet process' PATH in the container's
+//     filesystem.
+// 4.  The Kubelet process must have CAP_SYS_ADMIN (required by nsenter); at
+//     the present, this effectively means that the kubelet is running in a
+//     privileged container.
+// 5.  The volume path used by the Kubelet must be the same inside and outside
+//     the container and be writable by the container (to initialize volume)
+//     contents. TODO: remove this requirement.
+// 6.  The host image must have mount, findmnt, and umount binaries in /bin,
+//     /usr/sbin, or /usr/bin
+//
+// For more information about mount propagation modes, see:
+//   https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
+type NsenterMounter struct {
+	// a map of commands to their paths on the host filesystem
+	paths map[string]string
+}
+
+func NewNsenterMounter() *NsenterMounter {
+	m := &NsenterMounter{
+		paths: map[string]string{
+			"mount":   "",
+			"findmnt": "",
+			"umount":  "",
+		},
+	}
+	// search for the mount command in other locations besides /usr/bin
+	for binary := range m.paths {
+		// default to root
+		m.paths[binary] = filepath.Join("/", binary)
+		for _, path := range []string{"/bin", "/usr/sbin", "/usr/bin"} {
+			binPath := filepath.Join(path, binary)
+			if _, err := os.Stat(filepath.Join(hostRootFsPath, binPath)); err != nil {
+				continue
+			}
+			m.paths[binary] = binPath
+			break
+		}
+		// TODO: error, so that the kubelet can stop if the mounts don't exist
+	}
+	return m
+}
+
+// NsenterMounter implements mount.Interface
+var _ = Interface(&NsenterMounter{})
+
+const (
+	hostRootFsPath     = "/rootfs"
+	hostProcMountsPath = "/rootfs/proc/1/mounts"
+	nsenterPath        = "nsenter"
+)
+
+// Mount runs mount(8) in the host's root mount namespace.  Aside from this
+// aspect, Mount has the same semantics as the mounter returned by mount.New()
+func (n *NsenterMounter) Mount(source string, target string, fstype string, options []string) error {
+	bind, bindRemountOpts := isBind(options)
+
+	if bind {
+		err := n.doNsenterMount(source, target, fstype, []string{"bind"})
+		if err != nil {
+			return err
+		}
+		return n.doNsenterMount(source, target, fstype, bindRemountOpts)
+	}
+
+	return n.doNsenterMount(source, target, fstype, options)
+}
+
+// doNsenterMount nsenters the host's mount namespace and performs the
+// requested mount.
+func (n *NsenterMounter) doNsenterMount(source, target, fstype string, options []string) error {
+	glog.V(5).Infof("nsenter Mounting %s %s %s %v", source, target, fstype, options)
+	args := n.makeNsenterArgs(source, target, fstype, options)
+
+	glog.V(5).Infof("Mount command: %v %v", nsenterPath, args)
+	exec := exec.New()
+	outputBytes, err := exec.Command(nsenterPath, args...).CombinedOutput()
+	if len(outputBytes) != 0 {
+		glog.V(5).Infof("Output of mounting %s to %s: %v", source, target, string(outputBytes))
+	}
+
+	return err
+}
+
+// makeNsenterArgs makes a list of argument to nsenter in order to do the
+// requested mount.
+func (n *NsenterMounter) makeNsenterArgs(source, target, fstype string, options []string) []string {
+	nsenterArgs := []string{
+		"--mount=/rootfs/proc/1/ns/mnt",
+		"--",
+		n.absHostPath("mount"),
+	}
+
+	args := makeMountArgs(source, target, fstype, options)
+
+	return append(nsenterArgs, args...)
+}
+
+// Unmount runs umount(8) in the host's mount namespace.
+func (n *NsenterMounter) Unmount(target string) error {
+	args := []string{
+		"--mount=/rootfs/proc/1/ns/mnt",
+		"--",
+		n.absHostPath("umount"),
+		target,
+	}
+
+	glog.V(5).Infof("Unmount command: %v %v", nsenterPath, args)
+	exec := exec.New()
+	outputBytes, err := exec.Command(nsenterPath, args...).CombinedOutput()
+	if len(outputBytes) != 0 {
+		glog.V(5).Infof("Output of unmounting %s: %v", target, string(outputBytes))
+	}
+
+	return err
+}
+
+// List returns a list of all mounted filesystems in the host's mount namespace.
+func (*NsenterMounter) List() ([]MountPoint, error) {
+	return listProcMounts(hostProcMountsPath)
+}
+
+// IsLikelyNotMountPoint determines whether a path is a mountpoint by calling findmnt
+// in the host's root mount namespace.
+func (n *NsenterMounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	file, err := filepath.Abs(file)
+	if err != nil {
+		return true, err
+	}
+
+	// Check the directory exists
+	if _, err = os.Stat(file); os.IsNotExist(err) {
+		glog.V(5).Infof("findmnt: directory %s does not exist", file)
+		return true, err
+	}
+	// Add --first-only option: since we are testing for the absence of a mountpoint, it is sufficient to get only
+	// the first of multiple possible mountpoints using --first-only.
+	// Also add fstype output to make sure that the output of target file will give the full path
+	// TODO: Need more refactoring for this function. Track the solution with issue #26996
+	args := []string{"--mount=/rootfs/proc/1/ns/mnt", "--", n.absHostPath("findmnt"), "-o", "target,fstype", "--noheadings", "--first-only", "--target", file}
+	glog.V(5).Infof("findmnt command: %v %v", nsenterPath, args)
+
+	exec := exec.New()
+	out, err := exec.Command(nsenterPath, args...).CombinedOutput()
+	if err != nil {
+		glog.V(2).Infof("Failed findmnt command for path %s: %v", file, err)
+		// Different operating systems behave differently for paths which are not mount points.
+		// On older versions (e.g. 2.20.1) we'd get error, on newer ones (e.g. 2.26.2) we'd get "/".
+		// It's safer to assume that it's not a mount point.
+		return true, nil
+	}
+	mountTarget := strings.Split(string(out), " ")[0]
+	mountTarget = strings.TrimSuffix(mountTarget, "\n")
+	glog.V(5).Infof("IsLikelyNotMountPoint findmnt output for path %s: %v:", file, mountTarget)
+
+	if mountTarget == file {
+		glog.V(5).Infof("IsLikelyNotMountPoint: %s is a mount point", file)
+		return false, nil
+	}
+	glog.V(5).Infof("IsLikelyNotMountPoint: %s is not a mount point", file)
+	return true, nil
+}
+
+// DeviceOpened checks if block device in use by calling Open with O_EXCL flag.
+// Returns true if open returns errno EBUSY, and false if errno is nil.
+// Returns an error if errno is any error other than EBUSY.
+// Returns with error if pathname is not a device.
+func (n *NsenterMounter) DeviceOpened(pathname string) (bool, error) {
+	return exclusiveOpenFailsOnDevice(pathname)
+}
+
+// PathIsDevice uses FileInfo returned from os.Stat to check if path refers
+// to a device.
+func (n *NsenterMounter) PathIsDevice(pathname string) (bool, error) {
+	return pathIsDevice(pathname)
+}
+
+//GetDeviceNameFromMount given a mount point, find the volume id from checking /proc/mounts
+func (n *NsenterMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
+	return getDeviceNameFromMount(n, mountPath, pluginDir)
+}
+
+func (n *NsenterMounter) absHostPath(command string) string {
+	path, ok := n.paths[command]
+	if !ok {
+		return command
+	}
+	return path
+}

vendor/k8s.io/kubernetes/pkg/util/mount/nsenter_mount_unsupported.go

@@ -0,0 +1,55 @@
+// +build !linux
+
+/*
+Copyright 2014 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 mount
+
+type NsenterMounter struct{}
+
+func NewNsenterMounter() *NsenterMounter {
+	return &NsenterMounter{}
+}
+
+var _ = Interface(&NsenterMounter{})
+
+func (*NsenterMounter) Mount(source string, target string, fstype string, options []string) error {
+	return nil
+}
+
+func (*NsenterMounter) Unmount(target string) error {
+	return nil
+}
+
+func (*NsenterMounter) List() ([]MountPoint, error) {
+	return []MountPoint{}, nil
+}
+
+func (*NsenterMounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	return true, nil
+}
+
+func (*NsenterMounter) DeviceOpened(pathname string) (bool, error) {
+	return false, nil
+}
+
+func (*NsenterMounter) PathIsDevice(pathname string) (bool, error) {
+	return true, nil
+}
+
+func (*NsenterMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) {
+	return "", nil
+}