mount

package
v1.15.0-alpha.2 Latest Latest
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 Go to latest Published: Apr 29, 2019 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Overview

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

View Source 
const FakeActionMount = "mount"

Values for FakeAction.Action

View Source 
const 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, pluginDir string) (string, error)

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

func GetFSGroupLinux added in v1.15.0 

func GetFSGroupLinux(pathname string) (int64, error)

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

func GetModeLinux added in v1.15.0 

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

GetModeLinux is shared between Linux and NsEnterMounter

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

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)

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

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 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 added in v1.8.0 

func NewOsExec() 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
}

Fake for testing.

func NewFakeExec added in v1.8.0 

func NewFakeExec(run runHook) *FakeExec

func (*FakeExec) Run added in v1.8.0 

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

type FakeMounter added in v0.13.0 

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 added in v1.4.0 

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

func (*FakeMounter) ExistsPath added in v1.9.0 

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

func (*FakeMounter) GetDeviceNameFromMount added in v1.3.6 

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

func (*FakeMounter) GetFSGroup added in v1.11.0 

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

func (*FakeMounter) GetFileType added in v1.9.0 

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

func (*FakeMounter) GetMode added in v1.11.0 

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

func (*FakeMounter) GetMountRefs added in v1.11.0 

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

func (*FakeMounter) GetSELinuxSupport added in v1.10.4 

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

func (*FakeMounter) IsLikelyNotMountPoint added in v1.1.0 

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

func (*FakeMounter) IsMountPointMatch added in v1.7.2 

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

func (*FakeMounter) List added in v0.13.0 

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

func (*FakeMounter) MakeDir added in v1.9.0 

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

func (*FakeMounter) MakeFile added in v1.9.0 

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

func (*FakeMounter) MakeRShared added in v1.8.0 

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

func (*FakeMounter) Mount added in v0.13.0 

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

func (*FakeMounter) PathIsDevice added in v1.4.0 

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

func (*FakeMounter) ResetLog added in v0.13.1 

func (f *FakeMounter) ResetLog()

func (*FakeMounter) Unmount added in v0.13.0 

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

type FileType added in v1.9.0 

type FileType string
const (
	MountsInGlobalPDPath          = "mounts"
	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.
	IsLikelyNotMountPoint(file string) (bool, error)
	// DeviceOpened determines if the device is in use elsewhere
	// on the system, i.e. still mounted.
	DeviceOpened(pathname string) (bool, error)
	// PathIsDevice determines if a path is a device.
	PathIsDevice(pathname string) (bool, error)
	// GetDeviceNameFromMount finds the device name by checking the mount path
	// to get the global mount path which matches its plugin directory
	GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
	// 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 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) DeviceOpened added in v1.4.0 

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 added in v1.9.0 

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

func (*Mounter) GetDeviceNameFromMount added in v1.3.6 

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

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

func (*Mounter) GetFSGroup added in v1.11.0 

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

func (*Mounter) GetFileType added in v1.9.0 

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

func (*Mounter) GetMode added in v1.11.0 

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

func (*Mounter) GetMountRefs added in v1.11.0 

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

func (*Mounter) GetSELinuxSupport added in v1.10.4 

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

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. 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 added in v1.7.2 

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

func (*Mounter) List added in v0.10.0 

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

List returns a list of all mounted filesystems.

func (*Mounter) MakeDir added in v1.9.0 

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

func (*Mounter) MakeFile added in v1.9.0 

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

func (*Mounter) MakeRShared added in v1.8.0 

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

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) PathIsDevice added in v1.4.0 

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 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 unformated

type Subpath added in v1.7.14 

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
}

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