mountidmapped

package module

v0.0.0-...-6f26c4d Latest Latest Go to latest Published: Apr 26, 2023 License: Apache-2.0 Imports: 7 Imported by: 0

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Repository

github.com/fuweid/go-mountidmapped

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Documentation ¶

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Index ¶

Variables
func Fsconfig(fd int, cmd int, key string, value string, aux int) (err error)
func GetUsernsFD(uidMaps, gidMaps []ProcIDMap) (_ *os.File, retErr error)
func IDMapMount(dir string, usernsFD uintptr) (int, error)
type ProcIDMap
type ProcIDMaps
- func (idMaps ProcIDMaps) Marshal() []byte
type ProcSyncType
- func (typ ProcSyncType) String() string

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	FSCONFIG_SET_FLAG        = 0x0
	FSCONFIG_SET_STRING      = 0x1
	FSCONFIG_SET_BINARY      = 0x2
	FSCONFIG_SET_PATH        = 0x3
	FSCONFIG_SET_PATH_EMPTY  = 0x4
	FSCONFIG_SET_FD          = 0x5
	FSCONFIG_CMD_CREATE      = 0x6
	FSCONFIG_CMD_RECONFIGURE = 0x7
)

Functions ¶

func Fsconfig ¶

func Fsconfig(fd int, cmd int, key string, value string, aux int) (err error)

Fsconfig is to call SYS_FSCONFIG syscall.

NOTE: It's based on https://go-review.googlesource.com/c/sys/+/398434.

func GetUsernsFD ¶

func GetUsernsFD(uidMaps, gidMaps []ProcIDMap) (_ *os.File, retErr error)

GetUsernsFD returns a userns file descriptor.

NOTE: It forks a short-live process without CLONE_FILES, which the process might hold the copied file descriptors in a short time.

func IDMapMount ¶

func IDMapMount(dir string, usernsFD uintptr) (int, error)

IDMapMount calls mount_setattr syscall with a given userns fd.

Types ¶

type ProcIDMap ¶

type ProcIDMap = syscall.SysProcIDMap

ProcIDMap holds Container ID to Host ID mappings used for User Namespaces in Linux. It's alias to syscall.SysProcIDMap.

type ProcIDMaps ¶

type ProcIDMaps []ProcIDMap

func (ProcIDMaps) Marshal ¶

func (idMaps ProcIDMaps) Marshal() []byte

Marshal returns data in the /proc/{uid,gid}_map's format.

type ProcSyncType ¶

type ProcSyncType uint8

ProcSyncType is used for synchronisation between parent and child process during setup user namespace mappings.

const (
	// ProcSyncReady is to notify parent that child is running with
	// pdeathsig and parent can start to write uid/gid maps.
	ProcSyncReady ProcSyncType = 1
	// ProcSyncExit is to notify parent that the child is going to exit.
	ProcSyncExit ProcSyncType = 2
)

func (ProcSyncType) String ¶

func (typ ProcSyncType) String() string

String returns human-readable type.

Source Files ¶

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Directories ¶

Path	Synopsis
cmd
ovl-mountidmapped

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