mount

package
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 Go to latest Published: Feb 9, 2021 License: Apache-2.0 Imports: 11 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 

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

AddSystemdScope adds "system-run --scope" to given command line If args contains sensitive material, use AddSystemdScopeSensitive to construct a safe to log string.

func AddSystemdScopeSensitive 

func AddSystemdScopeSensitive(systemdRunPath, mountName, command string, args []string, mountArgsLogStr string) (string, []string, string)

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 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 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 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 MakeBindOpts 

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

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 MakeBindOptsSensitive 

func MakeBindOptsSensitive(options []string, sensitiveOptions []string) (bool, []string, []string, []string)

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 MakeMountArgs 

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

MakeMountArgs makes the arguments to the mount(8) command. options MUST not contain sensitive material (like passwords).

func MakeMountArgsSensitive 

func MakeMountArgsSensitive(source, target, fstype string, options []string, sensitiveOptions []string) (mountArgs []string, mountArgsLogStr string)

MakeMountArgsSensitive makes the arguments to the mount(8) command. sensitiveOptions is an extention of options except they will not be logged (because they may contain sensitive material)

func NewMountError 

func NewMountError(mountErrorValue MountErrorType, format string, args ...interface{}) error

func PathExists 

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 

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. 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 StartsWithBackstep 

func StartsWithBackstep(rel string) bool

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

Types

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 FakeMounter 

type FakeMounter struct {
	MountPoints []MountPoint

	// Error to return for a path when calling IsLikelyNotMountPoint
	MountCheckErrors map[string]error

	UnmountFunc UnmountFunc
	// contains filtered or unexported fields
}

FakeMounter implements mount.Interface for tests.

func NewFakeMounter 

func NewFakeMounter(mps []MountPoint) *FakeMounter

NewFakeMounter returns a FakeMounter struct that implements Interface and is suitable for testing purposes.

func (*FakeMounter) GetLog 

func (f *FakeMounter) GetLog() []FakeAction

GetLog returns the slice of FakeActions taken by the mounter

func (*FakeMounter) GetMountRefs 

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

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

func (*FakeMounter) IsLikelyNotMountPoint 

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) List 

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

List returns all the in-memory mountpoints for FakeMounter

func (*FakeMounter) Mount 

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) MountSensitive 

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

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 (*FakeMounter) ResetLog 

func (f *FakeMounter) ResetLog()

ResetLog clears all the log entries in FakeMounter

func (*FakeMounter) Unmount 

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

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

type Interface 

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
	// 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)
}

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 MountError 

type MountError struct {
	Type    MountErrorType
	Message string
}

func (MountError) Error 

func (mountError MountError) Error() string

func (MountError) String 

func (mountError MountError) String() string

type MountErrorType 

type MountErrorType string
const (
	FilesystemMismatch  MountErrorType = "FilesystemMismatch"
	HasFilesystemErrors MountErrorType = "HasFilesystemErrors"
	UnformattedReadOnly MountErrorType = "UnformattedReadOnly"
	FormatFailed        MountErrorType = "FormatFailed"
	GetDiskFormatFailed MountErrorType = "GetDiskFormatFailed"
	UnknownMountError   MountErrorType = "UnknownMountError"
)

type MountInfo 

type MountInfo struct {
	// 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
}

MountInfo represents a single line in /proc/<pid>/mountinfo.

func ParseMountInfo 

func ParseMountInfo(filename string) ([]MountInfo, error)

ParseMountInfo parses /proc/xxx/mountinfo.

type MountPoint 

type MountPoint struct {
	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
}

MountPoint 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) GetMountRefs 

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 or a normal directory (for bind mount).

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

func (*Mounter) List 

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

List returns a list of all mounted filesystems.

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) MountSensitive 

func (mounter *Mounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []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.

func (*Mounter) Unmount 

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

Unmount unmounts the target.

type SafeFormatAndMount 

type SafeFormatAndMount struct {
	Interface
	Exec utilexec.Interface
}

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. options MUST not contain sensitive material (like passwords).

func (*SafeFormatAndMount) FormatAndMountSensitive 

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

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 (*SafeFormatAndMount) GetDiskFormat 

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

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

type UnmountFunc 

type UnmountFunc func(path string) error

UnmountFunc is a function callback to be executed during the Unmount() call.

Source Files

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