Remove terminal info

This maybe a nice extra but it adds complication to the usecase.  The
contract is listen on the socket and you get an fd to the pty master and
that is that.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

contrib/cmd/recvtty/recvtty.go

@@ -24,7 +24,6 @@ import (
 	"os"
 	"strings"
 
-	"github.com/opencontainers/runc/libcontainer"
 	"github.com/opencontainers/runc/libcontainer/utils"
 	"github.com/urfave/cli"
 )
@@ -102,13 +101,6 @@ func handleSingle(path string) error {
 		return err
 	}
 
-	// Print the file descriptor tag.
-	ti, err := libcontainer.GetTerminalInfo(master.Name())
-	if err != nil {
-		return err
-	}
-	fmt.Printf("[recvtty] received masterfd: container '%s'\n", ti.ContainerID)
-
 	// Copy from our stdio to the master fd.
 	quitChan := make(chan struct{})
 	go func() {
@@ -163,13 +155,6 @@ func handleNull(path string) error {
 				return
 			}
 
-			// Print the file descriptor tag.
-			ti, err := libcontainer.GetTerminalInfo(master.Name())
-			if err != nil {
-				bail(err)
-			}
-			fmt.Printf("[recvtty] received masterfd: container '%s'\n", ti.ContainerID)
-
 			// Just do a dumb copy to /dev/null.
 			devnull, err := os.OpenFile("/dev/null", os.O_RDWR, 0)
 			if err != nil {

libcontainer/console.go

@@ -1,8 +1,6 @@
 package libcontainer
 
 import (
-	"encoding/json"
-	"fmt"
 	"io"
 	"os"
 )
@@ -17,57 +15,3 @@ type Console interface {
 	// Fd returns the fd for the master of the pty.
 	File() *os.File
 }
-
-const (
-	TerminalInfoVersion uint32 = 201610041
-	TerminalInfoType    uint8  = 'T'
-)
-
-// TerminalInfo is the structure which is passed as the non-ancillary data
-// in the sendmsg(2) call when runc is run with --console-socket. It
-// contains some information about the container which the console master fd
-// relates to (to allow for consumers to use a single unix socket to handle
-// multiple containers). This structure will probably move to runtime-spec
-// at some point. But for now it lies in libcontainer.
-type TerminalInfo struct {
-	// Version of the API.
-	Version uint32 `json:"version"`
-
-	// Type of message (future proofing).
-	Type uint8 `json:"type"`
-
-	// Container contains the ID of the container.
-	ContainerID string `json:"container_id"`
-}
-
-func (ti *TerminalInfo) String() string {
-	encoded, err := json.Marshal(*ti)
-	if err != nil {
-		panic(err)
-	}
-	return string(encoded)
-}
-
-func NewTerminalInfo(containerId string) *TerminalInfo {
-	return &TerminalInfo{
-		Version:     TerminalInfoVersion,
-		Type:        TerminalInfoType,
-		ContainerID: containerId,
-	}
-}
-
-func GetTerminalInfo(encoded string) (*TerminalInfo, error) {
-	ti := new(TerminalInfo)
-	if err := json.Unmarshal([]byte(encoded), ti); err != nil {
-		return nil, err
-	}
-
-	if ti.Type != TerminalInfoType {
-		return nil, fmt.Errorf("terminal info: incorrect type in payload (%q): %q", TerminalInfoType, ti.Type)
-	}
-	if ti.Version != TerminalInfoVersion {
-		return nil, fmt.Errorf("terminal info: incorrect version in payload (%q): %q", TerminalInfoVersion, ti.Version)
-	}
-
-	return ti, nil
-}

utils_linux.go

@@ -218,10 +218,6 @@ type runner struct {
 	notifySocket    *notifySocket
 }
 
-func (r *runner) terminalinfo() *libcontainer.TerminalInfo {
-	return libcontainer.NewTerminalInfo(r.container.ID())
-}
-
 func (r *runner) run(config *specs.Process) (int, error) {
 	if err := r.checkTerminal(config); err != nil {
 		r.destroy()