mount

package
v1.16.0-beta.0 Latest Latest
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 Go to latest Published: Aug 13, 2019 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Overview

Package mount defines an interface to mounting filesystems.

Index

Constants

View Source 
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"
)

Variables

This section is empty.

Functions

func AddSystemdScope added in v1.15.0 

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 added in v1.11.7 

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 added in v1.15.0 

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 added in v1.15.0 

func ExclusiveOpenFailsOnDevice(pathname string) (bool, error)

ExclusiveOpenFailsOnDevice is shared with NsEnterMounter

func GetDeviceNameFromMount added in v0.15.0 

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 added in v1.15.0 

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 GetModeLinux added in v1.15.0 

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

GetModeLinux is shared between Linux and NsEnterMounter

func GetOwnerLinux 

func GetOwnerLinux(pathname string) (int64, int64, error)

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

func GetSELinux added in v1.15.0 

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

GetSELinux is common implementation of GetSELinuxSupport on Linux.

func HasMountRefs added in v1.10.0 

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

HasMountRefs checks if the given mountPath has mountRefs. TODO: this is a workaround for the unmount device issue caused by gci mounter. In GCI cluster, if gci mounter is used for mounting, the container started by mounter script will cause additional mounts created in the container. Since these mounts are irrelevant to the original mounts, they should be not considered when checking the mount references. Current solution is to filter out those mount paths that contain the string of original mount path. Plan to work on better approach to solve this issue.

func IsBind added in v1.15.0 

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 added in v1.11.7 

func IsCorruptedMnt(err error) bool

IsCorruptedMnt return true if err is about corrupted mount point

func IsNotMountPoint added in v1.4.5 

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 added in v1.15.0 

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 added in v1.11.7 

func PathExists(path string) (bool, error)

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

func PathWithinBase added in v1.12.0 

func PathWithinBase(fullPath, basePath string) bool

PathWithinBase checks if give path is within given base directory.

func SearchMountPoints added in v1.15.0 

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 added in v1.14.0 

func StartsWithBackstep(rel string) bool

StartsWithBackstep checks if the given path starts with a backstep segment.

Types

type Exec added in v1.8.0 

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

Exec is an interface for executing commands on systems.

func NewOSExec added in v1.16.0 

func NewOSExec() Exec

NewOSExec returns a new Exec interface implementation based on exec()

type FakeAction added in v0.13.1 

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 added in v1.8.0 

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

FakeExec for testing.

func NewFakeExec added in v1.8.0 

func NewFakeExec(run runHook) *FakeExec

NewFakeExec returns a new FakeExec

func (*FakeExec) Run added in v1.8.0 

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

Run executes the command using the optional runhook, if given

type FakeHostUtil 

type FakeHostUtil struct {
	MountPoints []MountPoint
	Filesystem  map[string]FileType
	// contains filtered or unexported fields
}

FakeHostUtil is a fake mount.HostUtils implementation for testing

func (*FakeHostUtil) DeviceOpened 

func (hu *FakeHostUtil) DeviceOpened(pathname string) (bool, error)

DeviceOpened checks if block device referenced by pathname is in use by checking if is listed as a device in the in-memory mountpoint table. 

func (hu *FakeHostUtil) EvalHostSymlinks(pathname string) (string, error)

EvalHostSymlinks returns the path name after evaluating symlinks. No-op for testing

func (*FakeHostUtil) GetDeviceNameFromMount 

func (hu *FakeHostUtil) GetDeviceNameFromMount(mounter Interface, mountPath, pluginMountDir string) (string, error)

GetDeviceNameFromMount given a mount point, find the volume id

func (*FakeHostUtil) GetFileType 

func (hu *FakeHostUtil) GetFileType(pathname string) (FileType, error)

GetFileType checks for file/directory/socket/block/character devices. Defaults to Directory if otherwise unspecified.

func (*FakeHostUtil) GetMode 

func (hu *FakeHostUtil) GetMode(pathname string) (os.FileMode, error)

GetMode returns permissions of pathname. Not implemented for testing

func (*FakeHostUtil) GetOwner 

func (hu *FakeHostUtil) GetOwner(pathname string) (int64, int64, error)

GetOwner returns the integer ID for the user and group of the given path Not implemented for testing

func (*FakeHostUtil) GetSELinuxSupport 

func (hu *FakeHostUtil) GetSELinuxSupport(pathname string) (bool, error)

GetSELinuxSupport tests if pathname is on a mount that supports SELinux. Not implemented for testing

func (*FakeHostUtil) MakeDir 

func (hu *FakeHostUtil) MakeDir(pathname string) error

MakeDir creates a new directory. No-op for testing

func (*FakeHostUtil) MakeFile 

func (hu *FakeHostUtil) MakeFile(pathname string) error

MakeFile creates a new file. No-op for testing

func (*FakeHostUtil) MakeRShared 

func (hu *FakeHostUtil) MakeRShared(path string) error

MakeRShared checks if path is shared and bind-mounts it as rshared if needed. No-op for testing

func (*FakeHostUtil) PathExists 

func (hu *FakeHostUtil) PathExists(pathname string) (bool, error)

PathExists checks if pathname exists.

func (*FakeHostUtil) PathIsDevice 

func (hu *FakeHostUtil) PathIsDevice(pathname string) (bool, error)

PathIsDevice always returns true

type FakeMounter added in v0.13.0 

type FakeMounter struct {
	MountPoints []MountPoint
	Log         []FakeAction
	// 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) GetMountRefs added in v1.11.0 

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

GetMountRefs finds all mount references to the path, returns a list of paths.

func (*FakeMounter) IsLikelyNotMountPoint added in v1.1.0 

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

IsLikelyNotMountPoint determines whether a path is a mountpoint by checking if the absolute path to file is in the in-memory mountpoints

func (*FakeMounter) IsMountPointMatch added in v1.7.2 

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

IsMountPointMatch tests if dir and mp are the same path

func (*FakeMounter) List added in v0.13.0 

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

List returns all the in-memory mountpoints for FakeMounter

func (*FakeMounter) Mount added in v0.13.0 

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

Mount records the mount event and updates the in-memory mount points for FakeMounter

func (*FakeMounter) ResetLog added in v0.13.1 

func (f *FakeMounter) ResetLog()

ResetLog clears all the log entries in FakeMounter

func (*FakeMounter) Unmount added in v0.13.0 

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

Unmount records the unmount event and updates the in-memory mount points for FakeMounter

type FileType added in v1.9.0 

type FileType string

FileType enumerates the known set of possible file types. 

const (

	// FileTypeBlockDev defines a constant for the block device FileType.
	FileTypeBlockDev FileType = "BlockDevice"
	// FileTypeCharDev defines a constant for the character device FileType.
	FileTypeCharDev FileType = "CharDevice"
	// FileTypeDirectory defines a constant for the directory FileType.
	FileTypeDirectory FileType = "Directory"
	// FileTypeFile defines a constant for the file FileType.
	FileTypeFile FileType = "File"
	// FileTypeSocket defines a constant for the socket FileType.
	FileTypeSocket FileType = "Socket"
	// FileTypeUnknown defines a constant for an unknown FileType.
	FileTypeUnknown FileType = ""
)

type HostUtils 

type HostUtils interface {
	// DeviceOpened determines if the device (e.g. /dev/sdc) 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(mounter Interface, 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.
	GetFileType(pathname string) (FileType, error)
	// MakeFile creates an empty file.
	MakeFile(pathname string) error
	// MakeDir creates a new directory.
	MakeDir(pathname string) error
	// PathExists tests if the given path already exists
	// Error is returned on any other error than "file not found".
	PathExists(pathname string) (bool, error)
	// EvalHostSymlinks returns the path name after evaluating symlinks.
	EvalHostSymlinks(pathname string) (string, error)
	// GetOwner returns the integer ID for the user and group of the given path
	GetOwner(pathname string) (int64, 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)
}

HostUtils defines the set of methods for interacting with paths on a host.

func NewHostUtil 

func NewHostUtil() HostUtils

NewHostUtil returns a struct that implements the HostUtils interface on linux platforms

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 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)
	// IsMountPointMatch determines if the mountpoint matches the dir.
	IsMountPointMatch(mp MountPoint, dir string) bool
	// 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.
	IsLikelyNotMountPoint(file string) (bool, 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)
}

Interface defines the set of methods to allow for mount operations on a system.

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
}

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

func ListProcMounts added in v1.15.0 

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

ListProcMounts is shared with NsEnterMounter

type Mounter added in v0.10.0 

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) GetMountRefs added in v1.11.0 

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

GetMountRefs finds all mount references to pathname, returns a list of paths. Path could be a mountpoint path, device or a normal directory (for bind mount).

func (*Mounter) IsLikelyNotMountPoint added in v1.1.0 

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

func (*Mounter) IsMountPointMatch added in v1.7.2 

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

IsMountPointMatch returns true if the path in mp is the same as dir

func (*Mounter) List added in v0.10.0 

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

List returns a list of all mounted filesystems.

func (*Mounter) Mount added in v0.10.0 

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) Unmount added in v0.10.0 

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

Unmount unmounts the target.

type SafeFormatAndMount added in v1.1.0 

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 added in v1.2.0 

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 added in v1.9.0 

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

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

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