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rebase: update kubernetes to v1.20.0

Browse Source 
updated kubernetes packages to latest
release.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna
2020-12-17 17:58:29 +05:30
committed by mergify[bot]
parent 4abe128bd8
commit 83559144b1
1624 changed files with 247222 additions and 160270 deletions
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Apache License
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# See the OWNERS docs at https://go.k8s.io/owners
reviewers:
- jingxu97
- saad-ali
- jsafrane
- msau42
- andyzhangx
- gnufied
approvers:
- jingxu97
- saad-ali
- jsafrane

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## Purpose
This repository defines an interface to mounting filesystems to be consumed by
various Kubernetes and out-of-tree CSI components.
Consumers of this repository can make use of functions like 'Mount' to mount
source to target as fstype with given options, 'Unmount' to unmount a target.
Other useful functions include 'List' all mounted file systems and find all
mount references to a path using 'GetMountRefs'
## Community, discussion, contribution, and support
Learn how to engage with the Kubernetes community on the [community
page](http://kubernetes.io/community/).
You can reach the maintainers of this repository at:
- Slack: #sig-storage (on https://kubernetes.slack.com -- get an
invite at slack.kubernetes.io)
- Mailing List:
https://groups.google.com/forum/#!forum/kubernetes-sig-storage
### Code of Conduct
Participation in the Kubernetes community is governed by the [Kubernetes
Code of Conduct](code-of-conduct.md).
### Contibution Guidelines
See [CONTRIBUTING.md](CONTRIBUTING.md) for more information.

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# Defined below are the security contacts for this repo.
#
# They are the contact point for the Product Security Committee to reach out
# to for triaging and handling of incoming issues.
#
# The below names agree to abide by the
# [Embargo Policy](https://git.k8s.io/security/private-distributors-list.md#embargo-policy)
# and will be removed and replaced if they violate that agreement.
#
# DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
# INSTRUCTIONS AT https://kubernetes.io/security/
saad-ali
cjcullen
joelsmith
liggitt
philips
tallclair

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# Kubernetes Community Code of Conduct
Please refer to our [Kubernetes Community Code of Conduct](https://git.k8s.io/community/code-of-conduct.md)

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/*
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 // import "k8s.io/mount-utils"

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/*
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 (
"os"
"path/filepath"
"sync"
"k8s.io/klog/v2"
)
// FakeMounter implements mount.Interface for tests.
type FakeMounter struct {
MountPoints []MountPoint
log []FakeAction
// Error to return for a path when calling IsLikelyNotMountPoint
MountCheckErrors map[string]error
// Some tests run things in parallel, make sure the mounter does not produce
// any golang's DATA RACE warnings.
mutex sync.Mutex
UnmountFunc UnmountFunc
}
// UnmountFunc is a function callback to be executed during the Unmount() call.
type UnmountFunc func(path string) error
var _ Interface = &FakeMounter{}
const (
// FakeActionMount is the string for specifying mount as FakeAction.Action
FakeActionMount = "mount"
// FakeActionUnmount is the string for specifying unmount as FakeAction.Action
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
}
// NewFakeMounter returns a FakeMounter struct that implements Interface and is
// suitable for testing purposes.
func NewFakeMounter(mps []MountPoint) *FakeMounter {
return &FakeMounter{
MountPoints: mps,
}
}
// ResetLog clears all the log entries in FakeMounter
func (f *FakeMounter) ResetLog() {
f.mutex.Lock()
defer f.mutex.Unlock()
f.log = []FakeAction{}
}
// GetLog returns the slice of FakeActions taken by the mounter
func (f *FakeMounter) GetLog() []FakeAction {
f.mutex.Lock()
defer f.mutex.Unlock()
return f.log
}
// Mount records the mount event and updates the in-memory mount points for FakeMounter
func (f *FakeMounter) Mount(source string, target string, fstype string, options []string) error {
return f.MountSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
}
// Mount records the mount event and updates the in-memory mount points for FakeMounter
// sensitiveOptions to be passed in a separate parameter from the normal
// mount options and ensures the sensitiveOptions are never logged. This
// method should be used by callers that pass sensitive material (like
// passwords) as mount options.
func (f *FakeMounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
f.mutex.Lock()
defer f.mutex.Unlock()
opts := []string{}
for _, option := range options {
// find 'bind' option
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
}
}
}
// reuse MountPoint.Opts field to mark mount as readonly
opts = append(opts, option)
}
// If target is a symlink, get its absolute path
absTarget, err := filepath.EvalSymlinks(target)
if err != nil {
absTarget = target
}
f.MountPoints = append(f.MountPoints, MountPoint{Device: source, Path: absTarget, Type: fstype, Opts: append(opts, sensitiveOptions...)})
klog.V(5).Infof("Fake mounter: mounted %s to %s", source, absTarget)
f.log = append(f.log, FakeAction{Action: FakeActionMount, Target: absTarget, Source: source, FSType: fstype})
return nil
}
func (f *FakeMounter) MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return f.MountSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
}
// Unmount records the unmount event and updates the in-memory mount points for FakeMounter
func (f *FakeMounter) Unmount(target string) error {
f.mutex.Lock()
defer f.mutex.Unlock()
// If target is a symlink, get its absolute path
absTarget, err := filepath.EvalSymlinks(target)
if err != nil {
absTarget = target
}
newMountpoints := []MountPoint{}
for _, mp := range f.MountPoints {
if mp.Path == absTarget {
if f.UnmountFunc != nil {
err := f.UnmountFunc(absTarget)
if err != nil {
return err
}
}
klog.V(5).Infof("Fake mounter: unmounted %s from %s", mp.Device, absTarget)
// 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: absTarget})
delete(f.MountCheckErrors, target)
return nil
}
// List returns all the in-memory mountpoints for FakeMounter
func (f *FakeMounter) List() ([]MountPoint, error) {
f.mutex.Lock()
defer f.mutex.Unlock()
return f.MountPoints, nil
}
// IsLikelyNotMountPoint determines whether a path is a mountpoint by checking
// if the absolute path to file is in the in-memory mountpoints
func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error) {
f.mutex.Lock()
defer f.mutex.Unlock()
err := f.MountCheckErrors[file]
if err != nil {
return false, err
}
_, err = os.Stat(file)
if err != nil {
return true, err
}
// If file is a symlink, get its absolute path
absFile, err := filepath.EvalSymlinks(file)
if err != nil {
absFile = file
}
for _, mp := range f.MountPoints {
if mp.Path == absFile {
klog.V(5).Infof("isLikelyNotMountPoint for %s: mounted %s, false", file, mp.Path)
return false, nil
}
}
klog.V(5).Infof("isLikelyNotMountPoint for %s: true", file)
return true, nil
}
// GetMountRefs finds all mount references to the path, returns a
// list of paths.
func (f *FakeMounter) GetMountRefs(pathname string) ([]string, error) {
realpath, err := filepath.EvalSymlinks(pathname)
if err != nil {
// Ignore error in FakeMounter, because we actually didn't create files.
realpath = pathname
}
return getMountRefsByDev(f, realpath)
}

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// This is a generated file. Do not edit directly.
module k8s.io/mount-utils
go 1.15
require (
github.com/kr/pretty v0.2.0 // indirect
github.com/stretchr/testify v1.6.1
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
k8s.io/klog/v2 v2.4.0
k8s.io/utils v0.0.0-20201110183641-67b214c5f920
)

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@ -0,0 +1,32 @@
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v0.1.0 h1:M1Tv3VzNlEHg6uyACnRdtrploV2P7wZqH8BoQMtz0cg=
github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
github.com/go-logr/logr v0.2.0 h1:QvGt2nLcHH0WK9orKa+ppBPAxREcH364nPUedEpK0TY=
github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
github.com/kr/pretty v0.2.0 h1:s5hAObm+yFO5uHYt5dYjxi2rXrsnmRpJx4OYvIWUaQs=
github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/spf13/afero v1.2.2 h1:5jhuqJyZCZf2JRofRvN/nIFgIWNzPa3/Vz8mYylgbWc=
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
k8s.io/klog/v2 v2.0.0 h1:Foj74zO6RbjjP4hBEKjnYtjjAhGg4jNynUdYF6fJrok=
k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
k8s.io/klog/v2 v2.4.0 h1:7+X0fUguPyrKEC4WjH8iGDg3laWgMo5tMnRTIGTTxGQ=
k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g7yaSHkYPkpgelw=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=

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/*
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"
"os"
"path/filepath"
"strings"
utilexec "k8s.io/utils/exec"
)
const (
// Default mount command if mounter path is not specified.
defaultMountCommand = "mount"
// Log message where sensitive mount options were removed
sensitiveOptionsRemoved = "<masked>"
)
// Interface defines the set of methods to allow for mount operations on a system.
type Interface interface {
// Mount mounts source to target as fstype with given options.
// options MUST not contain sensitive material (like passwords).
Mount(source string, target string, fstype string, options []string) error
// MountSensitive is the same as Mount() but this method allows
// sensitiveOptions to be passed in a separate parameter from the normal
// mount options and ensures the sensitiveOptions are never logged. This
// method should be used by callers that pass sensitive material (like
// passwords) as mount options.
MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error
// MountSensitiveWithoutSystemd is the same as MountSensitive() but this method disable using systemd mount.
MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []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 directly from the OS is not guaranteed
// consistent (i.e. it could change between chunked reads). This is guaranteed
// to be consistent.
List() ([]MountPoint, error)
// IsLikelyNotMountPoint uses heuristics to determine if a directory
// is not a mountpoint.
// It should return ErrNotExist when the directory does not exist.
// IsLikelyNotMountPoint does NOT properly detect all mountpoint types
// most notably linux bind mounts and symbolic link. For callers that do not
// care about such situations, this is a faster alternative to calling List()
// and scanning that output.
IsLikelyNotMountPoint(file string) (bool, error)
// GetMountRefs finds all mount references to pathname, returning a slice of
// paths. Pathname can be a mountpoint path or a normal directory
// (for bind mount). On Linux, pathname is excluded from the slice.
// For example, if /dev/sdc was mounted at /path/a and /path/b,
// GetMountRefs("/path/a") would return ["/path/b"]
// GetMountRefs("/path/b") would return ["/path/a"]
// On Windows there is no way to query all mount points; as long as pathname is
// a valid mount, it will be returned.
GetMountRefs(pathname string) ([]string, error)
}
// Compile-time check to ensure all Mounter implementations satisfy
// the mount interface.
var _ Interface = &Mounter{}
// MountPoint represents a single line in /proc/mounts or /etc/fstab.
type MountPoint struct { // nolint: golint
Device string
Path string
Type string
Opts []string // Opts may contain sensitive mount options (like passwords) and MUST be treated as such (e.g. not logged).
Freq int
Pass int
}
type MountErrorType string // nolint: golint
const (
FilesystemMismatch MountErrorType = "FilesystemMismatch"
HasFilesystemErrors MountErrorType = "HasFilesystemErrors"
UnformattedReadOnly MountErrorType = "UnformattedReadOnly"
FormatFailed MountErrorType = "FormatFailed"
GetDiskFormatFailed MountErrorType = "GetDiskFormatFailed"
UnknownMountError MountErrorType = "UnknownMountError"
)
type MountError struct { // nolint: golint
Type MountErrorType
Message string
}
func (mountError MountError) String() string {
return mountError.Message
}
func (mountError MountError) Error() string {
return mountError.Message
}
func NewMountError(mountErrorValue MountErrorType, format string, args ...interface{}) error {
mountError := MountError{
Type: mountErrorValue,
Message: fmt.Sprintf(format, args...),
}
return mountError
}
// 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
Exec utilexec.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.
// options MUST not contain sensitive material (like passwords).
func (mounter *SafeFormatAndMount) FormatAndMount(source string, target string, fstype string, options []string) error {
return mounter.FormatAndMountSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
}
// FormatAndMountSensitive is the same as FormatAndMount but this method allows
// sensitiveOptions to be passed in a separate parameter from the normal mount
// options and ensures the sensitiveOptions are never logged. This method should
// be used by callers that pass sensitive material (like passwords) as mount
// options.
func (mounter *SafeFormatAndMount) FormatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return mounter.formatAndMountSensitive(source, target, fstype, options, sensitiveOptions)
}
// getMountRefsByDev finds all references to the device provided
// by mountPath; returns a list of paths.
// Note that mountPath should be path after the evaluation of any symblolic links.
func getMountRefsByDev(mounter Interface, mountPath string) ([]string, error) {
mps, err := mounter.List()
if err != nil {
return nil, err
}
// Finding the device mounted to mountPath.
diskDev := ""
for i := range mps {
if mountPath == mps[i].Path {
diskDev = mps[i].Device
break
}
}
// Find all references to the device.
var refs []string
for i := range mps {
if mps[i].Device == diskDev || mps[i].Device == mountPath {
if mps[i].Path != mountPath {
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
}
// IsNotMountPoint determines if a directory is a mountpoint.
// It should return ErrNotExist when the directory does not exist.
// IsNotMountPoint is more expensive than IsLikelyNotMountPoint.
// IsNotMountPoint detects bind mounts in linux.
// IsNotMountPoint enumerates all the mountpoints using List() and
// the list of mountpoints may be large, then it uses
// isMountPointMatch to evaluate whether the directory is a mountpoint.
func IsNotMountPoint(mounter Interface, file string) (bool, error) {
// IsLikelyNotMountPoint provides a quick check
// to determine whether file IS A mountpoint.
notMnt, notMntErr := mounter.IsLikelyNotMountPoint(file)
if notMntErr != nil && os.IsPermission(notMntErr) {
// We were not allowed to do the simple stat() check, e.g. on NFS with
// root_squash. Fall back to /proc/mounts check below.
notMnt = true
notMntErr = nil
}
if notMntErr != nil {
return notMnt, notMntErr
}
// identified as mountpoint, so return this fact.
if notMnt == false {
return notMnt, nil
}
// Resolve any symlinks in file, kernel would do the same and use the resolved path in /proc/mounts.
resolvedFile, err := filepath.EvalSymlinks(file)
if err != nil {
return true, err
}
// check all mountpoints since IsLikelyNotMountPoint
// is not reliable for some mountpoint types.
mountPoints, mountPointsErr := mounter.List()
if mountPointsErr != nil {
return notMnt, mountPointsErr
}
for _, mp := range mountPoints {
if isMountPointMatch(mp, resolvedFile) {
notMnt = false
break
}
}
return notMnt, nil
}
// MakeBindOpts 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 MakeBindOpts(options []string) (bool, []string, []string) {
bind, bindOpts, bindRemountOpts, _ := MakeBindOptsSensitive(options, nil /* sensitiveOptions */)
return bind, bindOpts, bindRemountOpts
}
// MakeBindOptsSensitive is the same as MakeBindOpts but this method allows
// sensitiveOptions to be passed in a separate parameter from the normal mount
// options and ensures the sensitiveOptions are never logged. This method should
// be used by callers that pass sensitive material (like passwords) as mount
// options.
func MakeBindOptsSensitive(options []string, sensitiveOptions []string) (bool, []string, []string, []string) {
// Because we have an FD opened on the subpath bind mount, the "bind" option
// needs to be included, otherwise the mount target will error as busy if you
// remount as readonly.
//
// As a consequence, all read only bind mounts will no longer change the underlying
// volume mount to be read only.
bindRemountOpts := []string{"bind", "remount"}
bindRemountSensitiveOpts := []string{}
bind := false
bindOpts := []string{"bind"}
// _netdev is a userspace mount option and does not automatically get added when
// bind mount is created and hence we must carry it over.
if checkForNetDev(options, sensitiveOptions) {
bindOpts = append(bindOpts, "_netdev")
}
for _, option := range options {
switch option {
case "bind":
bind = true
case "remount":
default:
bindRemountOpts = append(bindRemountOpts, option)
}
}
for _, sensitiveOption := range sensitiveOptions {
switch sensitiveOption {
case "bind":
bind = true
case "remount":
default:
bindRemountSensitiveOpts = append(bindRemountSensitiveOpts, sensitiveOption)
}
}
return bind, bindOpts, bindRemountOpts, bindRemountSensitiveOpts
}
func checkForNetDev(options []string, sensitiveOptions []string) bool {
for _, option := range options {
if option == "_netdev" {
return true
}
}
for _, sensitiveOption := range sensitiveOptions {
if sensitiveOption == "_netdev" {
return true
}
}
return false
}
// PathWithinBase checks if give path is within given base directory.
func PathWithinBase(fullPath, basePath string) bool {
rel, err := filepath.Rel(basePath, fullPath)
if err != nil {
return false
}
if StartsWithBackstep(rel) {
// Needed to escape the base path.
return false
}
return true
}
// StartsWithBackstep checks if the given path starts with a backstep segment.
func StartsWithBackstep(rel string) bool {
// normalize to / and check for ../
return rel == ".." || strings.HasPrefix(filepath.ToSlash(rel), "../")
}
// sanitizedOptionsForLogging will return a comma separated string containing
// options and sensitiveOptions. Each entry in sensitiveOptions will be
// replaced with the string sensitiveOptionsRemoved
// e.g. o1,o2,<masked>,<masked>
func sanitizedOptionsForLogging(options []string, sensitiveOptions []string) string {
separator := ""
if len(options) > 0 && len(sensitiveOptions) > 0 {
separator = ","
}
sensitiveOptionsStart := ""
sensitiveOptionsEnd := ""
if len(sensitiveOptions) > 0 {
sensitiveOptionsStart = strings.Repeat(sensitiveOptionsRemoved+",", len(sensitiveOptions)-1)
sensitiveOptionsEnd = sensitiveOptionsRemoved
}
return strings.Join(options, ",") +
separator +
sensitiveOptionsStart +
sensitiveOptionsEnd
}

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/*
Copyright 2018 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 (
"fmt"
"os"
"k8s.io/klog/v2"
)
// CleanupMountPoint unmounts the given path and deletes the remaining directory
// if successful. If extensiveMountPointCheck is true IsNotMountPoint will be
// called instead of IsLikelyNotMountPoint. IsNotMountPoint is more expensive
// but properly handles bind mounts within the same fs.
func CleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) error {
pathExists, pathErr := PathExists(mountPath)
if !pathExists {
klog.Warningf("Warning: Unmount skipped because path does not exist: %v", mountPath)
return nil
}
corruptedMnt := IsCorruptedMnt(pathErr)
if pathErr != nil && !corruptedMnt {
return fmt.Errorf("Error checking path: %v", pathErr)
}
return doCleanupMountPoint(mountPath, mounter, extensiveMountPointCheck, corruptedMnt)
}
// doCleanupMountPoint unmounts the given path and
// deletes the remaining directory if successful.
// if extensiveMountPointCheck is true
// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
// IsNotMountPoint is more expensive but properly handles bind mounts within the same fs.
// if corruptedMnt is true, it means that the mountPath is a corrupted mountpoint, and the mount point check
// will be skipped
func doCleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool, corruptedMnt bool) error {
var notMnt bool
var err error
if !corruptedMnt {
if extensiveMountPointCheck {
notMnt, err = IsNotMountPoint(mounter, mountPath)
} else {
notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
}
if err != nil {
return err
}
if notMnt {
klog.Warningf("Warning: %q is not a mountpoint, deleting", mountPath)
return os.Remove(mountPath)
}
}
// Unmount the mount path
klog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
if err := mounter.Unmount(mountPath); err != nil {
return err
}
if extensiveMountPointCheck {
notMnt, err = IsNotMountPoint(mounter, mountPath)
} else {
notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
}
if err != nil {
return err
}
if notMnt {
klog.V(4).Infof("%q is unmounted, deleting the directory", mountPath)
return os.Remove(mountPath)
}
return fmt.Errorf("Failed to unmount path %v", mountPath)
}
// PathExists returns true if the specified path exists.
// TODO: clean this up to use pkg/util/file/FileExists
func PathExists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
} else if os.IsNotExist(err) {
return false, nil
} else if IsCorruptedMnt(err) {
return true, err
}
return false, err
}

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// +build !windows
/*
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 mount
import (
"fmt"
"os"
"strconv"
"strings"
"syscall"
utilio "k8s.io/utils/io"
)
const (
// At least number of fields per line in /proc/<pid>/mountinfo.
expectedAtLeastNumFieldsPerMountInfo = 10
// How many times to retry for a consistent read of /proc/mounts.
maxListTries = 3
)
// IsCorruptedMnt return true if err is about corrupted mount point
func IsCorruptedMnt(err error) bool {
if err == nil {
return false
}
var underlyingError error
switch pe := err.(type) {
case nil:
return false
case *os.PathError:
underlyingError = pe.Err
case *os.LinkError:
underlyingError = pe.Err
case *os.SyscallError:
underlyingError = pe.Err
}
return underlyingError == syscall.ENOTCONN || underlyingError == syscall.ESTALE || underlyingError == syscall.EIO || underlyingError == syscall.EACCES
}
// MountInfo represents a single line in /proc/<pid>/mountinfo.
type MountInfo struct { // nolint: golint
// Unique ID for the mount (maybe reused after umount).
ID int
// The ID of the parent mount (or of self for the root of this mount namespace's mount tree).
ParentID int
// Major indicates one half of the device ID which identifies the device class
// (parsed from `st_dev` for files on this filesystem).
Major int
// Minor indicates one half of the device ID which identifies a specific
// instance of device (parsed from `st_dev` for files on this filesystem).
Minor int
// The pathname of the directory in the filesystem which forms the root of this mount.
Root string
// Mount source, filesystem-specific information. e.g. device, tmpfs name.
Source string
// Mount point, the pathname of the mount point.
MountPoint string
// Optional fieds, zero or more fields of the form "tag[:value]".
OptionalFields []string
// The filesystem type in the form "type[.subtype]".
FsType string
// Per-mount options.
MountOptions []string
// Per-superblock options.
SuperOptions []string
}
// ParseMountInfo parses /proc/xxx/mountinfo.
func ParseMountInfo(filename string) ([]MountInfo, error) {
content, err := utilio.ConsistentRead(filename, maxListTries)
if err != nil {
return []MountInfo{}, err
}
contentStr := string(content)
infos := []MountInfo{}
for _, line := range strings.Split(contentStr, "\n") {
if line == "" {
// the last split() item is empty string following the last \n
continue
}
// See `man proc` for authoritative description of format of the file.
fields := strings.Fields(line)
if len(fields) < expectedAtLeastNumFieldsPerMountInfo {
return nil, fmt.Errorf("wrong number of fields in (expected at least %d, got %d): %s", expectedAtLeastNumFieldsPerMountInfo, len(fields), line)
}
id, err := strconv.Atoi(fields[0])
if err != nil {
return nil, err
}
parentID, err := strconv.Atoi(fields[1])
if err != nil {
return nil, err
}
mm := strings.Split(fields[2], ":")
if len(mm) != 2 {
return nil, fmt.Errorf("parsing '%s' failed: unexpected minor:major pair %s", line, mm)
}
major, err := strconv.Atoi(mm[0])
if err != nil {
return nil, fmt.Errorf("parsing '%s' failed: unable to parse major device id, err:%v", mm[0], err)
}
minor, err := strconv.Atoi(mm[1])
if err != nil {
return nil, fmt.Errorf("parsing '%s' failed: unable to parse minor device id, err:%v", mm[1], err)
}
info := MountInfo{
ID: id,
ParentID: parentID,
Major: major,
Minor: minor,
Root: fields[3],
MountPoint: fields[4],
MountOptions: strings.Split(fields[5], ","),
}
// All fields until "-" are "optional fields".
i := 6
for ; i < len(fields) && fields[i] != "-"; i++ {
info.OptionalFields = append(info.OptionalFields, fields[i])
}
// Parse the rest 3 fields.
i++
if len(fields)-i < 3 {
return nil, fmt.Errorf("expect 3 fields in %s, got %d", line, len(fields)-i)
}
info.FsType = fields[i]
info.Source = fields[i+1]
info.SuperOptions = strings.Split(fields[i+2], ",")
infos = append(infos, info)
}
return infos, nil
}
// isMountPointMatch returns true if the path in mp is the same as dir.
// Handles case where mountpoint dir has been renamed due to stale NFS mount.
func isMountPointMatch(mp MountPoint, dir string) bool {
deletedDir := fmt.Sprintf("%s\\040(deleted)", dir)
return ((mp.Path == dir) || (mp.Path == deletedDir))
}

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// +build windows
/*
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 mount
import (
"fmt"
"os"
"strconv"
"strings"
"syscall"
"k8s.io/klog/v2"
)
// following failure codes are from https://docs.microsoft.com/en-us/windows/desktop/debug/system-error-codes--1300-1699-
// ERROR_BAD_NETPATH = 53
// ERROR_NETWORK_BUSY = 54
// ERROR_UNEXP_NET_ERR = 59
// ERROR_NETNAME_DELETED = 64
// ERROR_NETWORK_ACCESS_DENIED = 65
// ERROR_BAD_DEV_TYPE = 66
// ERROR_BAD_NET_NAME = 67
// ERROR_SESSION_CREDENTIAL_CONFLICT = 1219
// ERROR_LOGON_FAILURE = 1326
var errorNoList = [...]int{53, 54, 59, 64, 65, 66, 67, 1219, 1326}
// IsCorruptedMnt return true if err is about corrupted mount point
func IsCorruptedMnt(err error) bool {
if err == nil {
return false
}
var underlyingError error
switch pe := err.(type) {
case nil:
return false
case *os.PathError:
underlyingError = pe.Err
case *os.LinkError:
underlyingError = pe.Err
case *os.SyscallError:
underlyingError = pe.Err
}
if ee, ok := underlyingError.(syscall.Errno); ok {
for _, errno := range errorNoList {
if int(ee) == errno {
klog.Warningf("IsCorruptedMnt failed with error: %v, error code: %v", err, errno)
return true
}
}
}
return false
}
// NormalizeWindowsPath makes sure the given path is a valid path on Windows
// systems by making sure all instances of `/` are replaced with `\\`, and the
// path beings with `c:`
func NormalizeWindowsPath(path string) string {
normalizedPath := strings.Replace(path, "/", "\\", -1)
if strings.HasPrefix(normalizedPath, "\\") {
normalizedPath = "c:" + normalizedPath
}
return normalizedPath
}
// ValidateDiskNumber : disk number should be a number in [0, 99]
func ValidateDiskNumber(disk string) error {
diskNum, err := strconv.Atoi(disk)
if err != nil {
return fmt.Errorf("wrong disk number format: %q, err:%v", disk, err)
}
if diskNum < 0 || diskNum > 99 {
return fmt.Errorf("disk number out of range: %q", disk)
}
return nil
}
// isMountPointMatch determines if the mountpoint matches the dir
func isMountPointMatch(mp MountPoint, dir string) bool {
return mp.Path == dir
}

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// +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 (
"fmt"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"syscall"
"k8s.io/klog/v2"
utilexec "k8s.io/utils/exec"
utilio "k8s.io/utils/io"
)
const (
// 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"
// Location of the mountinfo file
procMountInfoPath = "/proc/self/mountinfo"
// '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
withSystemd bool
}
// 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 {
return &Mounter{
mounterPath: mounterPath,
withSystemd: detectSystemd(),
}
}
// Mount mounts source to target as fstype with given options. 'source' and 'fstype' must
// be an empty string in case it's not required, e.g. for remount, or for auto filesystem
// type, where kernel handles fstype 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 {
return mounter.MountSensitive(source, target, fstype, options, nil)
}
// MountSensitive is the same as Mount() but this method allows
// sensitiveOptions to be passed in a separate parameter from the normal
// mount options and ensures the sensitiveOptions are never logged. This
// method should be used by callers that pass sensitive material (like
// passwords) as mount options.
func (mounter *Mounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
// Path to mounter binary if containerized mounter is needed. Otherwise, it is set to empty.
// All Linux distros are expected to be shipped with a mount utility that a support bind mounts.
mounterPath := ""
bind, bindOpts, bindRemountOpts, bindRemountOptsSensitive := MakeBindOptsSensitive(options, sensitiveOptions)
if bind {
err := mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindOpts, bindRemountOptsSensitive, true)
if err != nil {
return err
}
return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindRemountOpts, bindRemountOptsSensitive, true)
}
// The list of filesystems that require containerized mounter on GCI image cluster
fsTypesNeedMounter := map[string]struct{}{
"nfs": {},
"glusterfs": {},
"ceph": {},
"cifs": {},
}
if _, ok := fsTypesNeedMounter[fstype]; ok {
mounterPath = mounter.mounterPath
}
return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, options, sensitiveOptions, true)
}
// MountSensitiveWithoutSystemd is the same as MountSensitive() but disable using systemd mount.
func (mounter *Mounter) MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
mounterPath := ""
bind, bindOpts, bindRemountOpts, bindRemountOptsSensitive := MakeBindOptsSensitive(options, sensitiveOptions)
if bind {
err := mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindOpts, bindRemountOptsSensitive, false)
if err != nil {
return err
}
return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindRemountOpts, bindRemountOptsSensitive, false)
}
// The list of filesystems that require containerized mounter on GCI image cluster
fsTypesNeedMounter := map[string]struct{}{
"nfs": {},
"glusterfs": {},
"ceph": {},
"cifs": {},
}
if _, ok := fsTypesNeedMounter[fstype]; ok {
mounterPath = mounter.mounterPath
}
return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, options, sensitiveOptions, false)
}
// doMount runs the mount command. mounterPath is the path to mounter binary if containerized mounter is used.
// sensitiveOptions is an extension of options except they will not be logged (because they may contain sensitive material)
// systemdMountRequired is an extension of option to decide whether uses systemd mount.
func (mounter *Mounter) doMount(mounterPath string, mountCmd string, source string, target string, fstype string, options []string, sensitiveOptions []string, systemdMountRequired bool) error {
mountArgs, mountArgsLogStr := MakeMountArgsSensitive(source, target, fstype, options, sensitiveOptions)
if len(mounterPath) > 0 {
mountArgs = append([]string{mountCmd}, mountArgs...)
mountArgsLogStr = mountCmd + " " + mountArgsLogStr
mountCmd = mounterPath
}
if mounter.withSystemd && systemdMountRequired {
// Try to run mount via systemd-run --scope. This will escape the
// service where kubelet runs and any fuse daemons will be started in a
// specific scope. kubelet service than can be restarted without killing
// these fuse daemons.
//
// Complete command line (when mounterPath is not used):
// systemd-run --description=... --scope -- mount -t <type> <what> <where>
//
// Expected flow:
// * systemd-run creates a transient scope (=~ cgroup) and executes its
// argument (/bin/mount) there.
// * mount does its job, forks a fuse daemon if necessary and finishes.
// (systemd-run --scope finishes at this point, returning mount's exit
// code and stdout/stderr - thats one of --scope benefits).
// * systemd keeps the fuse daemon running in the scope (i.e. in its own
// cgroup) until the fuse daemon dies (another --scope benefit).
// Kubelet service can be restarted and the fuse daemon survives.
// * When the fuse daemon dies (e.g. during unmount) systemd removes the
// scope automatically.
//
// systemd-mount is not used because it's too new for older distros
// (CentOS 7, Debian Jessie).
mountCmd, mountArgs, mountArgsLogStr = AddSystemdScopeSensitive("systemd-run", target, mountCmd, mountArgs, mountArgsLogStr)
// } else {
// No systemd-run on the host (or we failed to check it), assume kubelet
// does not run as a systemd service.
// No code here, mountCmd and mountArgs are already populated.
}
// Logging with sensitive mount options removed.
klog.V(4).Infof("Mounting cmd (%s) with arguments (%s)", mountCmd, mountArgsLogStr)
command := exec.Command(mountCmd, mountArgs...)
output, err := command.CombinedOutput()
if err != nil {
klog.Errorf("Mount failed: %v\nMounting command: %s\nMounting arguments: %s\nOutput: %s\n", err, mountCmd, mountArgsLogStr, string(output))
return fmt.Errorf("mount failed: %v\nMounting command: %s\nMounting arguments: %s\nOutput: %s",
err, mountCmd, mountArgsLogStr, string(output))
}
return err
}
// detectSystemd returns true if OS runs with systemd as init. When not sure
// (permission errors, ...), it returns false.
// There may be different ways how to detect systemd, this one makes sure that
// systemd-runs (needed by Mount()) works.
func detectSystemd() bool {
if _, err := exec.LookPath("systemd-run"); err != nil {
klog.V(2).Infof("Detected OS without systemd")
return false
}
// Try to run systemd-run --scope /bin/true, that should be enough
// to make sure that systemd is really running and not just installed,
// which happens when running in a container with a systemd-based image
// but with different pid 1.
cmd := exec.Command("systemd-run", "--description=Kubernetes systemd probe", "--scope", "true")
output, err := cmd.CombinedOutput()
if err != nil {
klog.V(2).Infof("Cannot run systemd-run, assuming non-systemd OS")
klog.V(4).Infof("systemd-run output: %s, failed with: %v", string(output), err)
return false
}
klog.V(2).Infof("Detected OS with systemd")
return true
}
// MakeMountArgs makes the arguments to the mount(8) command.
// options MUST not contain sensitive material (like passwords).
func MakeMountArgs(source, target, fstype string, options []string) (mountArgs []string) {
mountArgs, _ = MakeMountArgsSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
return mountArgs
}
// MakeMountArgsSensitive makes the arguments to the mount(8) command.
// sensitiveOptions is an extension of options except they will not be logged (because they may contain sensitive material)
func MakeMountArgsSensitive(source, target, fstype string, options []string, sensitiveOptions []string) (mountArgs []string, mountArgsLogStr string) {
// Build mount command as follows:
// mount [-t $fstype] [-o $options] [$source] $target
mountArgs = []string{}
mountArgsLogStr = ""
if len(fstype) > 0 {
mountArgs = append(mountArgs, "-t", fstype)
mountArgsLogStr += strings.Join(mountArgs, " ")
}
if len(options) > 0 || len(sensitiveOptions) > 0 {
combinedOptions := []string{}
combinedOptions = append(combinedOptions, options...)
combinedOptions = append(combinedOptions, sensitiveOptions...)
mountArgs = append(mountArgs, "-o", strings.Join(combinedOptions, ","))
// exclude sensitiveOptions from log string
mountArgsLogStr += " -o " + sanitizedOptionsForLogging(options, sensitiveOptions)
}
if len(source) > 0 {
mountArgs = append(mountArgs, source)
mountArgsLogStr += " " + source
}
mountArgs = append(mountArgs, target)
mountArgsLogStr += " " + target
return mountArgs, mountArgsLogStr
}
// AddSystemdScope adds "system-run --scope" to given command line
// If args contains sensitive material, use AddSystemdScopeSensitive to construct
// a safe to log string.
func AddSystemdScope(systemdRunPath, mountName, command string, args []string) (string, []string) {
descriptionArg := fmt.Sprintf("--description=Kubernetes transient mount for %s", mountName)
systemdRunArgs := []string{descriptionArg, "--scope", "--", command}
return systemdRunPath, append(systemdRunArgs, args...)
}
// AddSystemdScopeSensitive adds "system-run --scope" to given command line
// It also accepts takes a sanitized string containing mount arguments, mountArgsLogStr,
// and returns the string appended to the systemd command for logging.
func AddSystemdScopeSensitive(systemdRunPath, mountName, command string, args []string, mountArgsLogStr string) (string, []string, string) {
descriptionArg := fmt.Sprintf("--description=Kubernetes transient mount for %s", mountName)
systemdRunArgs := []string{descriptionArg, "--scope", "--", command}
return systemdRunPath, append(systemdRunArgs, args...), strings.Join(systemdRunArgs, " ") + " " + mountArgsLogStr
}
// Unmount unmounts the target.
func (mounter *Mounter) Unmount(target string) error {
klog.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", 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.
// It also can not distinguish between mountpoints and symbolic links.
// mkdir /tmp/a /tmp/b; mount --bind /tmp/a /tmp/b; IsLikelyNotMountPoint("/tmp/b")
// will return true. When in fact /tmp/b is a mount point. If this situation
// is of interest to you, don't use this function...
func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
stat, err := os.Stat(file)
if err != nil {
return true, err
}
rootStat, err := os.Stat(filepath.Dir(strings.TrimSuffix(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
}
// GetMountRefs finds all mount references to pathname, returns a
// list of paths. Path could be a mountpoint or a normal
// directory (for bind mount).
func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
pathExists, pathErr := PathExists(pathname)
if !pathExists {
return []string{}, nil
} else if IsCorruptedMnt(pathErr) {
klog.Warningf("GetMountRefs found corrupted mount at %s, treating as unmounted path", pathname)
return []string{}, nil
} else if pathErr != nil {
return nil, fmt.Errorf("error checking path %s: %v", pathname, pathErr)
}
realpath, err := filepath.EvalSymlinks(pathname)
if err != nil {
return nil, err
}
return SearchMountPoints(realpath, procMountInfoPath)
}
// checkAndRepairFileSystem checks and repairs filesystems using command fsck.
func (mounter *SafeFormatAndMount) checkAndRepairFilesystem(source string) error {
klog.V(4).Infof("Checking for issues with fsck on disk: %s", source)
args := []string{"-a", source}
out, err := mounter.Exec.Command("fsck", args...).CombinedOutput()
if err != nil {
ee, isExitError := err.(utilexec.ExitError)
switch {
case err == utilexec.ErrExecutableNotFound:
klog.Warningf("'fsck' not found on system; continuing mount without running 'fsck'.")
case isExitError && ee.ExitStatus() == fsckErrorsCorrected:
klog.Infof("Device %s has errors which were corrected by fsck.", source)
case isExitError && ee.ExitStatus() == fsckErrorsUncorrected:
return NewMountError(HasFilesystemErrors, "'fsck' found errors on device %s but could not correct them: %s", source, string(out))
case isExitError && ee.ExitStatus() > fsckErrorsUncorrected:
klog.Infof("`fsck` error %s", string(out))
}
}
return nil
}
// formatAndMount uses unix utils to format and mount the given disk
func (mounter *SafeFormatAndMount) formatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
readOnly := false
for _, option := range options {
if option == "ro" {
readOnly = true
break
}
}
if !readOnly {
// Check sensitiveOptions for ro
for _, option := range sensitiveOptions {
if option == "ro" {
readOnly = true
break
}
}
}
options = append(options, "defaults")
mountErrorValue := UnknownMountError
// Check if the disk is already formatted
existingFormat, err := mounter.GetDiskFormat(source)
if err != nil {
return NewMountError(GetDiskFormatFailed, "failed to get disk format of disk %s: %v", source, err)
}
// Use 'ext4' as the default
if len(fstype) == 0 {
fstype = "ext4"
}
if existingFormat == "" {
// Do not attempt to format the disk if mounting as readonly, return an error to reflect this.
if readOnly {
return NewMountError(UnformattedReadOnly, "cannot mount unformatted disk %s as we are manipulating it in read-only mode", source)
}
// Disk is unformatted so format it.
args := []string{source}
if fstype == "ext4" || fstype == "ext3" {
args = []string{
"-F", // Force flag
"-m0", // Zero blocks reserved for super-user
source,
}
}
klog.Infof("Disk %q appears to be unformatted, attempting to format as type: %q with options: %v", source, fstype, args)
output, err := mounter.Exec.Command("mkfs."+fstype, args...).CombinedOutput()
if err != nil {
// Do not log sensitiveOptions only options
sensitiveOptionsLog := sanitizedOptionsForLogging(options, sensitiveOptions)
detailedErr := fmt.Sprintf("format of disk %q failed: type:(%q) target:(%q) options:(%q) errcode:(%v) output:(%v) ", source, fstype, target, sensitiveOptionsLog, err, string(output))
klog.Error(detailedErr)
return NewMountError(FormatFailed, detailedErr)
}
klog.Infof("Disk successfully formatted (mkfs): %s - %s %s", fstype, source, target)
} else {
if fstype != existingFormat {
// Verify that the disk is formatted with filesystem type we are expecting
mountErrorValue = FilesystemMismatch
klog.Warningf("Configured to mount disk %s as %s but current format is %s, things might break", source, existingFormat, fstype)
}
if !readOnly {
// Run check tools on the disk to fix repairable issues, only do this for formatted volumes requested as rw.
err := mounter.checkAndRepairFilesystem(source)
if err != nil {
return err
}
}
}
// Mount the disk
klog.V(4).Infof("Attempting to mount disk %s in %s format at %s", source, fstype, target)
if err := mounter.MountSensitive(source, target, fstype, options, sensitiveOptions); err != nil {
return NewMountError(mountErrorValue, err.Error())
}
return nil
}
// GetDiskFormat uses 'blkid' to see if the given disk is unformatted
func (mounter *SafeFormatAndMount) GetDiskFormat(disk string) (string, error) {
args := []string{"-p", "-s", "TYPE", "-s", "PTTYPE", "-o", "export", disk}
klog.V(4).Infof("Attempting to determine if disk %q is formatted using blkid with args: (%v)", disk, args)
dataOut, err := mounter.Exec.Command("blkid", args...).CombinedOutput()
output := string(dataOut)
klog.V(4).Infof("Output: %q", output)
if err != nil {
if exit, ok := err.(utilexec.ExitError); ok {
if exit.ExitStatus() == 2 {
// Disk device is unformatted.
// For `blkid`, if the specified token (TYPE/PTTYPE, etc) was
// not found, or no (specified) devices could be identified, an
// exit code of 2 is returned.
return "", nil
}
}
klog.Errorf("Could not determine if disk %q is formatted (%v)", disk, err)
return "", err
}
var fstype, pttype string
lines := strings.Split(output, "\n")
for _, l := range lines {
if len(l) <= 0 {
// Ignore empty line.
continue
}
cs := strings.Split(l, "=")
if len(cs) != 2 {
return "", fmt.Errorf("blkid returns invalid output: %s", output)
}
// TYPE is filesystem type, and PTTYPE is partition table type, according
// to https://www.kernel.org/pub/linux/utils/util-linux/v2.21/libblkid-docs/.
if cs[0] == "TYPE" {
fstype = cs[1]
} else if cs[0] == "PTTYPE" {
pttype = cs[1]
}
}
if len(pttype) > 0 {
klog.V(4).Infof("Disk %s detected partition table type: %s", disk, pttype)
// Returns a special non-empty string as filesystem type, then kubelet
// will not format it.
return "unknown data, probably partitions", nil
}
return fstype, nil
}
// ListProcMounts is shared with NsEnterMounter
func ListProcMounts(mountFilePath string) ([]MountPoint, error) {
content, err := utilio.ConsistentRead(mountFilePath, maxListTries)
if err != nil {
return nil, err
}
return parseProcMounts(content)
}
func parseProcMounts(content []byte) ([]MountPoint, error) {
out := []MountPoint{}
lines := strings.Split(string(content), "\n")
for _, line := range lines {
if line == "" {
// the last split() item is empty string following the last \n
continue
}
fields := strings.Fields(line)
if len(fields) != expectedNumFieldsPerLine {
// Do not log line in case it contains sensitive Mount options
return nil, fmt.Errorf("wrong number of fields (expected %d, got %d)", expectedNumFieldsPerLine, len(fields))
}
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 nil, err
}
mp.Freq = freq
pass, err := strconv.Atoi(fields[5])
if err != nil {
return nil, err
}
mp.Pass = pass
out = append(out, mp)
}
return out, nil
}
// SearchMountPoints finds all mount references to the source, returns a list of
// mountpoints.
// The source can be a mount point or a normal directory (bind mount). We
// didn't support device because there is no use case by now.
// Some filesystems may share a source name, e.g. tmpfs. And for bind mounting,
// it's possible to mount a non-root path of a filesystem, so we need to use
// root path and major:minor to represent mount source uniquely.
// This implementation is shared between Linux and NsEnterMounter
func SearchMountPoints(hostSource, mountInfoPath string) ([]string, error) {
mis, err := ParseMountInfo(mountInfoPath)
if err != nil {
return nil, err
}
mountID := 0
rootPath := ""
major := -1
minor := -1
// Finding the underlying root path and major:minor if possible.
// We need search in backward order because it's possible for later mounts
// to overlap earlier mounts.
for i := len(mis) - 1; i >= 0; i-- {
if hostSource == mis[i].MountPoint || PathWithinBase(hostSource, mis[i].MountPoint) {
// If it's a mount point or path under a mount point.
mountID = mis[i].ID
rootPath = filepath.Join(mis[i].Root, strings.TrimPrefix(hostSource, mis[i].MountPoint))
major = mis[i].Major
minor = mis[i].Minor
break
}
}
if rootPath == "" || major == -1 || minor == -1 {
return nil, fmt.Errorf("failed to get root path and major:minor for %s", hostSource)
}
var refs []string
for i := range mis {
if mis[i].ID == mountID {
// Ignore mount entry for mount source itself.
continue
}
if mis[i].Root == rootPath && mis[i].Major == major && mis[i].Minor == minor {
refs = append(refs, mis[i].MountPoint)
}
}
return refs, nil
}

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vendor/k8s.io/mount-utils/mount_unsupported.go generated vendored Normal file
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// +build !linux,!windows
/*
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 (
"errors"
)
// Mounter implements mount.Interface for unsupported platforms
type Mounter struct {
mounterPath string
}
var errUnsupported = errors.New("util/mount on this platform is not supported")
// 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 {
return &Mounter{
mounterPath: mounterPath,
}
}
// Mount always returns an error on unsupported platforms
func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
return errUnsupported
}
// MountSensitive always returns an error on unsupported platforms
func (mounter *Mounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return errUnsupported
}
// MountSensitiveWithoutSystemd always returns an error on unsupported platforms
func (mounter *Mounter) MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return errUnsupported
}
// Unmount always returns an error on unsupported platforms
func (mounter *Mounter) Unmount(target string) error {
return errUnsupported
}
// List always returns an error on unsupported platforms
func (mounter *Mounter) List() ([]MountPoint, error) {
return []MountPoint{}, errUnsupported
}
// IsLikelyNotMountPoint always returns an error on unsupported platforms
func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
return true, errUnsupported
}
// GetMountRefs always returns an error on unsupported platforms
func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
return nil, errUnsupported
}
func (mounter *SafeFormatAndMount) formatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return mounter.Interface.Mount(source, target, fstype, options)
}
func (mounter *SafeFormatAndMount) diskLooksUnformatted(disk string) (bool, error) {
return true, errUnsupported
}

330
vendor/k8s.io/mount-utils/mount_windows.go generated vendored Normal file
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// +build windows
/*
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 mount
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"k8s.io/klog/v2"
"k8s.io/utils/keymutex"
)
const (
accessDenied string = "access is denied"
)
// Mounter provides the default implementation of mount.Interface
// for the windows platform. This implementation assumes that the
// kubelet is running in the host's root mount namespace.
type Mounter struct {
mounterPath string
}
// 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 {
return &Mounter{
mounterPath: mounterPath,
}
}
// acquire lock for smb mount
var getSMBMountMutex = keymutex.NewHashed(0)
// Mount : mounts source to target with given options.
// currently only supports cifs(smb), bind mount(for disk)
func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
return mounter.MountSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
}
// MountSensitiveWithoutSystemd is the same as MountSensitive() but disable using ssytemd mount.
// Windows not supported systemd mount, this function degrades to MountSensitive().
func (mounter *Mounter) MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
return mounter.MountSensitive(source, target, fstype, options, sensitiveOptions /* sensitiveOptions */)
}
// MountSensitive is the same as Mount() but this method allows
// sensitiveOptions to be passed in a separate parameter from the normal
// mount options and ensures the sensitiveOptions are never logged. This
// method should be used by callers that pass sensitive material (like
// passwords) as mount options.
func (mounter *Mounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
target = NormalizeWindowsPath(target)
sanitizedOptionsForLogging := sanitizedOptionsForLogging(options, sensitiveOptions)
if source == "tmpfs" {
klog.V(3).Infof("mounting source (%q), target (%q), with options (%q)", source, target, sanitizedOptionsForLogging)
return os.MkdirAll(target, 0755)
}
parentDir := filepath.Dir(target)
if err := os.MkdirAll(parentDir, 0755); err != nil {
return err
}
klog.V(4).Infof("mount options(%q) source:%q, target:%q, fstype:%q, begin to mount",
sanitizedOptionsForLogging, source, target, fstype)
bindSource := source
if bind, _, _, _ := MakeBindOptsSensitive(options, sensitiveOptions); bind {
bindSource = NormalizeWindowsPath(source)
} else {
allOptions := []string{}
allOptions = append(allOptions, options...)
allOptions = append(allOptions, sensitiveOptions...)
if len(allOptions) < 2 {
return fmt.Errorf("mount options(%q) should have at least 2 options, current number:%d, source:%q, target:%q",
sanitizedOptionsForLogging, len(allOptions), source, target)
}
// currently only cifs mount is supported
if strings.ToLower(fstype) != "cifs" {
return fmt.Errorf("only cifs mount is supported now, fstype: %q, mounting source (%q), target (%q), with options (%q)", fstype, source, target, sanitizedOptionsForLogging)
}
// lock smb mount for the same source
getSMBMountMutex.LockKey(source)
defer getSMBMountMutex.UnlockKey(source)
username := allOptions[0]
password := allOptions[1]
if output, err := newSMBMapping(username, password, source); err != nil {
klog.Warningf("SMB Mapping(%s) returned with error(%v), output(%s)", source, err, string(output))
if isSMBMappingExist(source) {
valid, err := isValidPath(source)
if !valid {
if err == nil || isAccessDeniedError(err) {
klog.V(2).Infof("SMB Mapping(%s) already exists while it's not valid, return error: %v, now begin to remove and remount", source, err)
if output, err = removeSMBMapping(source); err != nil {
return fmt.Errorf("Remove-SmbGlobalMapping failed: %v, output: %q", err, output)
}
if output, err := newSMBMapping(username, password, source); err != nil {
return fmt.Errorf("New-SmbGlobalMapping(%s) failed: %v, output: %q", source, err, output)
}
}
} else {
klog.V(2).Infof("SMB Mapping(%s) already exists and is still valid, skip error(%v)", source, err)
}
} else {
return fmt.Errorf("New-SmbGlobalMapping(%s) failed: %v, output: %q", source, err, output)
}
}
}
// There is an issue in golang where EvalSymlinks fails on Windows when passed a
// UNC share root path without a trailing backslash.
// Ex: \\SERVER\share will fail to resolve but \\SERVER\share\ will resolve
// containerD on Windows calls EvalSymlinks so we'll add the backslash when making the symlink if it is missing.
// https://github.com/golang/go/pull/42096 fixes this issue in golang but a fix will not be available until
// golang v1.16
mklinkSource := bindSource
if !strings.HasSuffix(mklinkSource, "\\") {
mklinkSource = mklinkSource + "\\"
}
output, err := exec.Command("cmd", "/c", "mklink", "/D", target, mklinkSource).CombinedOutput()
if err != nil {
klog.Errorf("mklink failed: %v, source(%q) target(%q) output: %q", err, mklinkSource, target, string(output))
return err
}
klog.V(2).Infof("mklink source(%q) on target(%q) successfully, output: %q", mklinkSource, target, string(output))
return nil
}
// do the SMB mount with username, password, remotepath
// return (output, error)
func newSMBMapping(username, password, remotepath string) (string, error) {
if username == "" || password == "" || remotepath == "" {
return "", fmt.Errorf("invalid parameter(username: %s, password: %s, remoteapth: %s)", username, sensitiveOptionsRemoved, remotepath)
}
// use PowerShell Environment Variables to store user input string to prevent command line injection
// https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-5.1
cmdLine := `$PWord = ConvertTo-SecureString -String $Env:smbpassword -AsPlainText -Force` +
`;$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Env:smbuser, $PWord` +
`;New-SmbGlobalMapping -RemotePath $Env:smbremotepath -Credential $Credential`
cmd := exec.Command("powershell", "/c", cmdLine)
cmd.Env = append(os.Environ(),
fmt.Sprintf("smbuser=%s", username),
fmt.Sprintf("smbpassword=%s", password),
fmt.Sprintf("smbremotepath=%s", remotepath))
output, err := cmd.CombinedOutput()
return string(output), err
}
// check whether remotepath is already mounted
func isSMBMappingExist(remotepath string) bool {
cmd := exec.Command("powershell", "/c", `Get-SmbGlobalMapping -RemotePath $Env:smbremotepath`)
cmd.Env = append(os.Environ(), fmt.Sprintf("smbremotepath=%s", remotepath))
_, err := cmd.CombinedOutput()
return err == nil
}
// check whether remotepath is valid
// return (true, nil) if remotepath is valid
func isValidPath(remotepath string) (bool, error) {
cmd := exec.Command("powershell", "/c", `Test-Path $Env:remoteapth`)
cmd.Env = append(os.Environ(), fmt.Sprintf("remoteapth=%s", remotepath))
output, err := cmd.CombinedOutput()
if err != nil {
return false, fmt.Errorf("returned output: %s, error: %v", string(output), err)
}
return strings.HasPrefix(strings.ToLower(string(output)), "true"), nil
}
func isAccessDeniedError(err error) bool {
return err != nil && strings.Contains(strings.ToLower(err.Error()), accessDenied)
}
// remove SMB mapping
func removeSMBMapping(remotepath string) (string, error) {
cmd := exec.Command("powershell", "/c", `Remove-SmbGlobalMapping -RemotePath $Env:smbremotepath -Force`)
cmd.Env = append(os.Environ(), fmt.Sprintf("smbremotepath=%s", remotepath))
output, err := cmd.CombinedOutput()
return string(output), err
}
// Unmount unmounts the target.
func (mounter *Mounter) Unmount(target string) error {
klog.V(4).Infof("azureMount: Unmount target (%q)", target)
target = NormalizeWindowsPath(target)
if output, err := exec.Command("cmd", "/c", "rmdir", target).CombinedOutput(); err != nil {
klog.Errorf("rmdir failed: %v, output: %q", err, string(output))
return err
}
return nil
}
// List returns a list of all mounted filesystems. todo
func (mounter *Mounter) List() ([]MountPoint, error) {
return []MountPoint{}, nil
}
// IsLikelyNotMountPoint determines if a directory is not a mountpoint.
func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
stat, err := os.Lstat(file)
if err != nil {
return true, err
}
if stat.Mode()&os.ModeSymlink != 0 {
return false, err
}
return true, nil
}
// GetMountRefs : empty implementation here since there is no place to query all mount points on Windows
func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
windowsPath := NormalizeWindowsPath(pathname)
pathExists, pathErr := PathExists(windowsPath)
if !pathExists {
return []string{}, nil
} else if IsCorruptedMnt(pathErr) {
klog.Warningf("GetMountRefs found corrupted mount at %s, treating as unmounted path", windowsPath)
return []string{}, nil
} else if pathErr != nil {
return nil, fmt.Errorf("error checking path %s: %v", windowsPath, pathErr)
}
return []string{pathname}, nil
}
func (mounter *SafeFormatAndMount) formatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
// Try to mount the disk
klog.V(4).Infof("Attempting to formatAndMount disk: %s %s %s", fstype, source, target)
if err := ValidateDiskNumber(source); err != nil {
klog.Errorf("diskMount: formatAndMount failed, err: %v", err)
return err
}
if len(fstype) == 0 {
// Use 'NTFS' as the default
fstype = "NTFS"
}
// format disk if it is unformatted(raw)
cmd := fmt.Sprintf("Get-Disk -Number %s | Where partitionstyle -eq 'raw' | Initialize-Disk -PartitionStyle MBR -PassThru"+
" | New-Partition -UseMaximumSize | Format-Volume -FileSystem %s -Confirm:$false", source, fstype)
if output, err := mounter.Exec.Command("powershell", "/c", cmd).CombinedOutput(); err != nil {
return fmt.Errorf("diskMount: format disk failed, error: %v, output: %q", err, string(output))
}
klog.V(4).Infof("diskMount: Disk successfully formatted, disk: %q, fstype: %q", source, fstype)
volumeIds, err := listVolumesOnDisk(source)
if err != nil {
return err
}
driverPath := volumeIds[0]
target = NormalizeWindowsPath(target)
output, err := mounter.Exec.Command("cmd", "/c", "mklink", "/D", target, driverPath).CombinedOutput()
if err != nil {
klog.Errorf("mklink(%s, %s) failed: %v, output: %q", target, driverPath, err, string(output))
return err
}
klog.V(2).Infof("formatAndMount disk(%s) fstype(%s) on(%s) with output(%s) successfully", driverPath, fstype, target, string(output))
return nil
}
// ListVolumesOnDisk - returns back list of volumes(volumeIDs) in the disk (requested in diskID).
func listVolumesOnDisk(diskID string) (volumeIDs []string, err error) {
cmd := fmt.Sprintf("(Get-Disk -DeviceId %s | Get-Partition | Get-Volume).UniqueId", diskID)
output, err := exec.Command("powershell", "/c", cmd).CombinedOutput()
klog.V(4).Infof("listVolumesOnDisk id from %s: %s", diskID, string(output))
if err != nil {
return []string{}, fmt.Errorf("error list volumes on disk. cmd: %s, output: %s, error: %v", cmd, string(output), err)
}
volumeIds := strings.Split(strings.TrimSpace(string(output)), "\r\n")
return volumeIds, nil
}
// getAllParentLinks walks all symbolic links and return all the parent targets recursively
func getAllParentLinks(path string) ([]string, error) {
const maxIter = 255
links := []string{}
for {
links = append(links, path)
if len(links) > maxIter {
return links, fmt.Errorf("unexpected length of parent links: %v", links)
}
fi, err := os.Lstat(path)
if err != nil {
return links, fmt.Errorf("Lstat: %v", err)
}
if fi.Mode()&os.ModeSymlink == 0 {
break
}
path, err = os.Readlink(path)
if err != nil {
return links, fmt.Errorf("Readlink error: %v", err)
}
}
return links, nil
}