kubernetes – k8s.io/kubernetes/pkg/util/mount Index | Files

package mount

import "k8s.io/kubernetes/pkg/util/mount"

Package mount defines an interface to mounting filesystems.

TODO(thockin): This whole pkg is pretty linux-centric. As soon as we have an alternate platform, we will need to abstract further.

Index

Constants 

const FakeActionMount = "mount"

Values for FakeAction.Action 

const FakeActionUnmount = "unmount"

Functions

func AddSystemdScope 

func AddSystemdScope(systemdRunPath, mountName, command string, args []string) (string, []string)

AddSystemdScope adds "system-run --scope" to given command line implementation is shared with NsEnterMounter

func CleanupMountPoint 

func CleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) error

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 DoMakeRShared 

func DoMakeRShared(path string, mountInfoFilename string) error

DoMakeRShared is common implementation of MakeRShared on Linux. It checks if path is shared and bind-mounts it as rshared if needed. mountCmd and mountArgs are expected to contain mount-like command, DoMakeRShared will add '--bind <path> <path>' and '--make-rshared <path>' to mountArgs.

func ExclusiveOpenFailsOnDevice 

func ExclusiveOpenFailsOnDevice(pathname string) (bool, error)

ExclusiveOpenFailsOnDevice is shared with NsEnterMounter

func GetDeviceNameFromMount 

func GetDeviceNameFromMount(mounter Interface, mountPath string) (string, int, error)

GetDeviceNameFromMount: given a mnt point, find the device from /proc/mounts returns the device name, reference count, and error code

func GetDeviceNameFromMountLinux 

func GetDeviceNameFromMountLinux(mounter Interface, mountPath, pluginMountDir string) (string, error)

GetDeviceNameFromMountLinux find the device name from /proc/mounts in which the mount path reference should match the given plugin mount directory. In case no mount path reference matches, returns the volume name taken from its given mountPath This implementation is shared with NsEnterMounter

func GetFSGroupLinux 

func GetFSGroupLinux(pathname string) (int64, error)

GetFSGroupLinux is shared between Linux and NsEnterMounter pathname must already be evaluated for symlinks

func GetModeLinux 

func GetModeLinux(pathname string) (os.FileMode, error)

GetModeLinux is shared between Linux and NsEnterMounter

func GetSELinux 

func GetSELinux(path string, mountInfoFilename string) (bool, error)

GetSELinux is common implementation of GetSELinuxSupport on Linux.

func HasMountRefs 

func HasMountRefs(mountPath string, mountRefs []string) bool

func IsBind 

func IsBind(options []string) (bool, []string, []string)

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 IsCorruptedMnt 

func IsCorruptedMnt(err error) bool

IsCorruptedMnt return true if err is about corrupted mount point

func IsNotMountPoint 

func IsNotMountPoint(mounter Interface, file string) (bool, error)

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 MakeMountArgs 

func MakeMountArgs(source, target, fstype string, options []string) []string

MakeMountArgs makes the arguments to the mount(8) command. Implementation is shared with NsEnterMounter

func PathExists 

func PathExists(path string) (bool, error)

TODO: clean this up to use pkg/util/file/FileExists PathExists returns true if the specified path exists.

func PathWithinBase 

func PathWithinBase(fullPath, basePath string) bool

PathWithinBase checks if give path is within given base directory.

func SearchMountPoints 

func SearchMountPoints(hostSource, mountInfoPath string) ([]string, error)

SearchMountPoints finds all mount references to the source, returns a list of mountpoints. This function assumes source cannot be device. 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 StartsWithBackstep 

func StartsWithBackstep(rel string) bool

StartsWithBackstep checks if the given path starts with a backstep segment

Types

type Exec 

type Exec interface {
	// Run executes a command and returns its stdout + stderr combined in one
	// stream.
	Run(cmd string, args ...string) ([]byte, error)
}

Exec executes command where mount utilities are. This can be either the host, container where kubelet runs or even a remote pod with mount utilities. Usual k8s.io/utils/exec interface is not used because kubelet.RunInContainer does not provide stdin/stdout/stderr streams.

func NewOsExec 

func NewOsExec() Exec

type FakeAction 

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
}

FakeAction objects are logged every time a fake mount or unmount is called.

type FakeExec 

type FakeExec struct {
	// contains filtered or unexported fields
}

Fake for testing.

func NewFakeExec 

func NewFakeExec(run runHook) *FakeExec

func (*FakeExec) Run 

func (f *FakeExec) Run(cmd string, args ...string) ([]byte, error)

type FakeMounter 

type FakeMounter struct {
	MountPoints []MountPoint
	Log         []FakeAction
	Filesystem  map[string]FileType
	// Error to return for a path when calling IsLikelyNotMountPoint
	MountCheckErrors map[string]error
	// contains filtered or unexported fields
}

FakeMounter implements mount.Interface for tests.

func (*FakeMounter) DeviceOpened 

func (f *FakeMounter) DeviceOpened(pathname string) (bool, error)
func (f *FakeMounter) EvalHostSymlinks(pathname string) (string, error)

func (*FakeMounter) ExistsPath 

func (f *FakeMounter) ExistsPath(pathname string) (bool, error)

func (*FakeMounter) GetDeviceNameFromMount 

func (f *FakeMounter) GetDeviceNameFromMount(mountPath, pluginMountDir string) (string, error)

func (*FakeMounter) GetFSGroup 

func (f *FakeMounter) GetFSGroup(pathname string) (int64, error)

func (*FakeMounter) GetFileType 

func (f *FakeMounter) GetFileType(pathname string) (FileType, error)

func (*FakeMounter) GetMode 

func (f *FakeMounter) GetMode(pathname string) (os.FileMode, error)

func (*FakeMounter) GetMountRefs 

func (f *FakeMounter) GetMountRefs(pathname string) ([]string, error)

func (*FakeMounter) GetSELinuxSupport 

func (f *FakeMounter) GetSELinuxSupport(pathname string) (bool, error)

func (*FakeMounter) IsLikelyNotMountPoint 

func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error)

func (*FakeMounter) IsMountPointMatch 

func (f *FakeMounter) IsMountPointMatch(mp MountPoint, dir string) bool

func (*FakeMounter) List 

func (f *FakeMounter) List() ([]MountPoint, error)

func (*FakeMounter) MakeDir 

func (f *FakeMounter) MakeDir(pathname string) error

func (*FakeMounter) MakeFile 

func (f *FakeMounter) MakeFile(pathname string) error

func (*FakeMounter) MakeRShared 

func (f *FakeMounter) MakeRShared(path string) error

func (*FakeMounter) Mount 

func (f *FakeMounter) Mount(source string, target string, fstype string, options []string) error

func (*FakeMounter) PathIsDevice 

func (f *FakeMounter) PathIsDevice(pathname string) (bool, error)

func (*FakeMounter) ResetLog 

func (f *FakeMounter) ResetLog()

func (*FakeMounter) Unmount 

func (f *FakeMounter) Unmount(target string) error

type FileType 

type FileType string
const (
	FileTypeDirectory FileType = "Directory"
	FileTypeFile      FileType = "File"
	FileTypeSocket    FileType = "Socket"
	FileTypeCharDev   FileType = "CharDevice"
	FileTypeBlockDev  FileType = "BlockDevice"
)

type Interface 

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)
	// IsMountPointMatch determines if the mountpoint matches the dir
	IsMountPointMatch(mp MountPoint, dir string) bool
	// IsLikelyNotMountPoint uses heuristics to determine if a directory
	// is 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.
	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 within its plugin directory
	GetDeviceNameFromMount(mountPath, pluginMountDir string) (string, error)
	// MakeRShared checks that given path is on a mount with 'rshared' mount
	// propagation. If not, it bind-mounts the path as rshared.
	MakeRShared(path string) error
	// GetFileType checks for file/directory/socket/block/character devices.
	// Will operate in the host mount namespace if kubelet is running in a container
	GetFileType(pathname string) (FileType, error)
	// MakeFile creates an empty file.
	// Will operate in the host mount namespace if kubelet is running in a container
	MakeFile(pathname string) error
	// MakeDir creates a new directory.
	// Will operate in the host mount namespace if kubelet is running in a container
	MakeDir(pathname string) error
	// Will operate in the host mount namespace if kubelet is running in a container.
	// Error is returned on any other error than "file not found".
	ExistsPath(pathname string) (bool, error)
	// EvalHostSymlinks returns the path name after evaluating symlinks.
	// Will operate in the host mount namespace if kubelet is running in a container.
	EvalHostSymlinks(pathname string) (string, error)
	// GetMountRefs finds all mount references to the path, returns a
	// list of paths. Path could be a mountpoint path, device or a normal
	// directory (for bind mount).
	GetMountRefs(pathname string) ([]string, error)
	// GetFSGroup returns FSGroup of the path.
	GetFSGroup(pathname string) (int64, error)
	// GetSELinuxSupport returns true if given path is on a mount that supports
	// SELinux.
	GetSELinuxSupport(pathname string) (bool, error)
	// GetMode returns permissions of the path.
	GetMode(pathname string) (os.FileMode, error)
}

func New 

func New(mounterPath string) Interface

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.

type MountPoint 

type MountPoint struct {
	Device string
	Path   string
	Type   string
	Opts   []string
	Freq   int
	Pass   int
}

This represents a single line in /proc/mounts or /etc/fstab.

func ListProcMounts 

func ListProcMounts(mountFilePath string) ([]MountPoint, error)

ListProcMounts is shared with NsEnterMounter

type Mounter 

type Mounter struct {
	// contains filtered or unexported fields
}

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.

func (*Mounter) DeviceOpened 

func (mounter *Mounter) DeviceOpened(pathname string) (bool, error)

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) EvalHostSymlinks(pathname string) (string, error)

func (*Mounter) ExistsPath 

func (mounter *Mounter) ExistsPath(pathname string) (bool, error)

func (*Mounter) GetDeviceNameFromMount 

func (mounter *Mounter) GetDeviceNameFromMount(mountPath, pluginMountDir string) (string, error)

GetDeviceNameFromMount: given a mount point, find the device name from its global mount point

func (*Mounter) GetFSGroup 

func (mounter *Mounter) GetFSGroup(pathname string) (int64, error)

func (*Mounter) GetFileType 

func (mounter *Mounter) GetFileType(pathname string) (FileType, error)

func (*Mounter) GetMode 

func (mounter *Mounter) GetMode(pathname string) (os.FileMode, error)

func (*Mounter) GetMountRefs 

func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error)

func (*Mounter) GetSELinuxSupport 

func (mounter *Mounter) GetSELinuxSupport(pathname string) (bool, error)

func (*Mounter) IsLikelyNotMountPoint 

func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error)

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 if of interest to you, don't use this function...

func (*Mounter) IsMountPointMatch 

func (mounter *Mounter) IsMountPointMatch(mp MountPoint, dir string) bool

func (*Mounter) List 

func (*Mounter) List() ([]MountPoint, error)

List returns a list of all mounted filesystems.

func (*Mounter) MakeDir 

func (mounter *Mounter) MakeDir(pathname string) error

func (*Mounter) MakeFile 

func (mounter *Mounter) MakeFile(pathname string) error

func (*Mounter) MakeRShared 

func (mounter *Mounter) MakeRShared(path string) error

func (*Mounter) Mount 

func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error

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) PathIsDevice 

func (mounter *Mounter) PathIsDevice(pathname string) (bool, error)

PathIsDevice uses FileInfo returned from os.Stat to check if path refers to a device.

func (*Mounter) Unmount 

func (mounter *Mounter) Unmount(target string) error

Unmount unmounts the target.

type SafeFormatAndMount 

type SafeFormatAndMount struct {
	Interface
	Exec
}

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.

func (*SafeFormatAndMount) FormatAndMount 

func (mounter *SafeFormatAndMount) FormatAndMount(source string, target string, fstype string, options []string) error

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 (*SafeFormatAndMount) GetDiskFormat 

func (mounter *SafeFormatAndMount) GetDiskFormat(disk string) (string, error)

GetDiskFormat uses 'blkid' to see if the given disk is unformatted

type Subpath 

type Subpath struct {
	// index of the VolumeMount for this container
	VolumeMountIndex int
	// Full path to the subpath directory on the host
	Path string
	// name of the volume that is a valid directory name.
	VolumeName string
	// Full path to the volume path
	VolumePath string
	// Path to the pod's directory, including pod UID
	PodDir string
	// Name of the container
	ContainerName string
}

Source Files

doc.go exec.go fake.go mount.go mount_helper_common.go mount_helper_unix.go mount_linux.go

Version
v1.15.6
Published
Nov 9, 2019
Platform
linux/amd64
Imports
15 packages
Last checked
20 minutes ago –

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