package utils

import "github.com/opencontainers/runc/libcontainer/utils"

Index ¶

• Constants
• func Annotations(labels []string) (bundle string, userAnnotations map[string]string)
• func CleanPath(path string) string
• func ExitStatus(status unix.WaitStatus) int
• func RecvFile(socket *os.File) (_ *os.File, Err error)
• func SearchLabels(labels []string, key string) (string, bool)
• func SendFile(socket *os.File, file *os.File) error
• func SendRawFd(socket *os.File, msg string, fd uintptr) error
• func WriteJSON(w io.Writer, v interface{}) error

Constants ¶

const MaxNameLen = 4096

MaxNameLen is the maximum length of the name of a file descriptor being sent using SendFile. The name of the file handle returned by RecvFile will never be larger than this value.

Functions ¶

func Annotations ¶

func Annotations(labels []string) (bundle string, userAnnotations map[string]string)

Annotations returns the bundle path and user defined annotations from the libcontainer state. We need to remove the bundle because that is a label added by libcontainer.

func CleanPath ¶

func CleanPath(path string) string

CleanPath makes a path safe for use with filepath.Join. This is done by not only cleaning the path, but also (if the path is relative) adding a leading '/' and cleaning it (then removing the leading '/'). This ensures that a path resulting from prepending another path will always resolve to lexically be a subdirectory of the prefixed path. This is all done lexically, so paths that include symlinks won't be safe as a result of using CleanPath.

func ExitStatus ¶

func ExitStatus(status unix.WaitStatus) int

ExitStatus returns the correct exit status for a process based on if it was signaled or exited cleanly

func RecvFile ¶

func RecvFile(socket *os.File) (_ *os.File, Err error)

RecvFile waits for a file descriptor to be sent over the given AF_UNIX socket. The file name of the remote file descriptor will be recreated locally (it is sent as non-auxiliary data in the same payload).

func SearchLabels ¶

func SearchLabels(labels []string, key string) (string, bool)

SearchLabels searches through a list of key=value pairs for a given key, returning its value, and the binary flag telling whether the key exist.

func SendFile ¶

func SendFile(socket *os.File, file *os.File) error

SendFile sends a file over the given AF_UNIX socket. file.Name() is also included so that if the other end uses RecvFile, the file will have the same name information.

func SendRawFd ¶

func SendRawFd(socket *os.File, msg string, fd uintptr) error

SendRawFd sends a specific file descriptor over the given AF_UNIX socket.

func WriteJSON ¶

func WriteJSON(w io.Writer, v interface{}) error

WriteJSON writes the provided struct v to w using standard json marshaling without a trailing newline. This is used instead of json.Encoder because there might be a problem in json decoder in some cases, see: https://github.com/docker/docker/issues/14203#issuecomment-174177790

Source Files ¶

cmsg.go utils.go