Merge pull request opencontainers#428 from crosbymichael/console

Export console New func

libcontainer/console_freebsd.go

@@ -6,8 +6,8 @@ import (
 	"errors"
 )
 
-// newConsole returns an initalized console that can be used within a container by copying bytes
+// NewConsole returns an initalized console that can be used within a container by copying bytes
 // from the master side to the slave that is attached as the tty for the container's init process.
-func newConsole(uid, gid int) (Console, error) {
+func NewConsole(uid, gid int) (Console, error) {
 	return nil, errors.New("libcontainer console is not supported on FreeBSD")
 }

libcontainer/console_linux.go

@@ -10,9 +10,9 @@ import (
 	"github.com/opencontainers/runc/libcontainer/label"
 )
 
-// newConsole returns an initalized console that can be used within a container by copying bytes
+// NewConsole returns an initalized console that can be used within a container by copying bytes
 // from the master side to the slave that is attached as the tty for the container's init process.
-func newConsole(uid, gid int) (Console, error) {
+func NewConsole(uid, gid int) (Console, error) {
 	master, err := os.OpenFile("/dev/ptmx", syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0)
 	if err != nil {
 		return nil, err

libcontainer/console_windows.go

@@ -1,7 +1,7 @@
 package libcontainer
 
-// newConsole returns an initalized console that can be used within a container
-func newConsole(uid, gid int) (Console, error) {
+// NewConsole returns an initalized console that can be used within a container
+func NewConsole(uid, gid int) (Console, error) {
 	return &windowsConsole{}, nil
 }
 

libcontainer/error.go

@@ -22,6 +22,7 @@ const (
 
 	// Common errors
 	ConfigInvalid
+	ConsoleExists
 	SystemError
 )
 
@@ -43,6 +44,8 @@ func (c ErrorCode) String() string {
 		return "Container is not stopped"
 	case ContainerNotRunning:
 		return "Container is not running"
+	case ConsoleExists:
+		return "Console exist for process"
 	default:
 		return "Unknown error"
 	}

libcontainer/process.go

@@ -80,10 +80,19 @@ func (p Process) Signal(sig os.Signal) error {
 
 // NewConsole creates new console for process and returns it
 func (p *Process) NewConsole(rootuid int) (Console, error) {
-	console, err := newConsole(rootuid, rootuid)
+	console, err := NewConsole(rootuid, rootuid)
 	if err != nil {
 		return nil, err
 	}
 	p.consolePath = console.Path()
 	return console, nil
 }
+
+// ConsoleFromPath sets the process's console with the path provided
+func (p *Process) ConsoleFromPath(path string) error {
+	if p.consolePath != "" {
+		return newGenericError(fmt.Errorf("console path already exists for process"), ConsoleExists)
+	}
+	p.consolePath = path
+	return nil
+}