utils

package
v1.0.0-rc4 Latest Latest
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Published: Aug 2, 2017 License: Apache-2.0 Imports: 11 Imported by: 0

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Constants

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const MaxNameLen = 4096

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

Variables

This section is empty.

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 added in v0.0.8

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 CloseExecFrom

func CloseExecFrom(minFd int) error

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 GenerateRandomName

func GenerateRandomName(prefix string, size int) (string, error)

GenerateRandomName returns a new name joined with a prefix. This size specified is used to truncate the randomly generated value

func GetIntSize

func GetIntSize() int

func NewSockPair

func NewSockPair(name string) (parent *os.File, child *os.File, err error)

NewSockPair returns a new unix socket pair

func RecvFd

func RecvFd(socket *os.File) (*os.File, error)

RecvFd 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 ResolveRootfs

func ResolveRootfs(uncleanRootfs string) (string, error)

ResolveRootfs ensures that the current working directory is not a symlink and returns the absolute path to the rootfs

func SearchLabels added in v0.1.0

func SearchLabels(labels []string, query string) string

SearchLabels searches a list of key-value pairs for the provided key and returns the corresponding value. The pairs must be separated with '='.

func SendFd

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

SendFd sends a file descriptor over the given AF_UNIX socket. In addition, the file.Name() of the given file will also be sent as non-auxiliary data in the same payload (allowing to send contextual information for a file descriptor).

func WriteJSON added in v0.0.7

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

WriteJSON writes the provided struct v to w using standard json marshaling

Types

This section is empty.

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