74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package libcontainer
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import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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)
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// Console represents a pseudo TTY.
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type Console interface {
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io.ReadWriteCloser
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// Path returns the filesystem path to the slave side of the pty.
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Path() string
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// Fd returns the fd for the master of the pty.
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File() *os.File
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}
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const (
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TerminalInfoVersion uint32 = 201610041
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TerminalInfoType uint8 = 'T'
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)
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// TerminalInfo is the structure which is passed as the non-ancillary data
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// in the sendmsg(2) call when runc is run with --console-socket. It
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// contains some information about the container which the console master fd
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// relates to (to allow for consumers to use a single unix socket to handle
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// multiple containers). This structure will probably move to runtime-spec
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// at some point. But for now it lies in libcontainer.
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type TerminalInfo struct {
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// Version of the API.
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Version uint32 `json:"version"`
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// Type of message (future proofing).
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Type uint8 `json:"type"`
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// Container contains the ID of the container.
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ContainerID string `json:"container_id"`
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}
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func (ti *TerminalInfo) String() string {
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encoded, err := json.Marshal(*ti)
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if err != nil {
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panic(err)
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}
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return string(encoded)
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}
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func NewTerminalInfo(containerId string) *TerminalInfo {
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return &TerminalInfo{
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Version: TerminalInfoVersion,
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Type: TerminalInfoType,
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ContainerID: containerId,
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}
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}
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func GetTerminalInfo(encoded string) (*TerminalInfo, error) {
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ti := new(TerminalInfo)
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if err := json.Unmarshal([]byte(encoded), ti); err != nil {
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return nil, err
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}
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if ti.Type != TerminalInfoType {
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return nil, fmt.Errorf("terminal info: incorrect type in payload (%q): %q", TerminalInfoType, ti.Type)
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}
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if ti.Version != TerminalInfoVersion {
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return nil, fmt.Errorf("terminal info: incorrect version in payload (%q): %q", TerminalInfoVersion, ti.Version)
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}
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return ti, nil
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}
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