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 StripRoot(root, path string) string
• 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 StripRoot ¶

func StripRoot(root, path string) string

StripRoot returns the passed path, stripping the root path if it was (lexicially) inside it. Note that both passed paths will always be treated as absolute, and the returned path will also always be absolute. In addition, the paths are cleaned before stripping the root.

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