Add stdin support for client and daemon

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

add_process.go

@@ -17,7 +17,7 @@ func (h *AddProcessEvent) Handle(e *Event) error {
 	if err != nil {
 		return err
 	}
-	l, err := h.s.copyIO(e.Stdout, e.Stderr, io)
+	l, err := h.s.copyIO(e.Stdin, e.Stdout, e.Stderr, io)
 	if err != nil {
 		// log the error but continue with the other commands
 		logrus.WithFields(logrus.Fields{

api/grpc/server/server.go

@@ -35,6 +35,7 @@ func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContaine
 	e.BundlePath = c.BundlePath
 	e.Stdout = c.Stdout
 	e.Stderr = c.Stderr
+	e.Stdin = c.Stdin
 	if c.Checkpoint != "" {
 		e.Checkpoint = &runtime.Checkpoint{
 			Name: c.Checkpoint,

ctr/container.go

@@ -6,7 +6,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"sync"
 	"syscall"
 	"text/tabwriter"
 
@@ -89,9 +88,8 @@ var StartCommand = cli.Command{
 			BundlePath: path,
 			Checkpoint: context.String("checkpoint"),
 		}
-		wg := &sync.WaitGroup{}
 		if context.Bool("interactive") {
-			if err := attachStdio(r, wg); err != nil {
+			if err := attachStdio(r); err != nil {
 				fatal(err.Error(), 1)
 			}
 		}
@@ -99,30 +97,38 @@ var StartCommand = cli.Command{
 		if _, err := c.CreateContainer(netcontext.Background(), r); err != nil {
 			fatal(err.Error(), 1)
 		}
-		wg.Wait()
+		if stdin != nil {
+			io.Copy(stdin, os.Stdin)
+		}
 	},
 }
 
-func attachStdio(r *types.CreateContainerRequest, wg *sync.WaitGroup) error {
+var stdin io.WriteCloser
+
+func attachStdio(r *types.CreateContainerRequest) error {
 	dir, err := ioutil.TempDir("", "ctr-")
 	if err != nil {
 		return err
 	}
-	wg.Add(2)
 	for _, p := range []struct {
 		path string
 		flag int
 		done func(f *os.File)
 	}{
+		{
+			path: filepath.Join(dir, "stdin"),
+			flag: syscall.O_RDWR,
+			done: func(f *os.File) {
+				r.Stdin = filepath.Join(dir, "stdin")
+				stdin = f
+			},
+		},
 		{
 			path: filepath.Join(dir, "stdout"),
 			flag: syscall.O_RDWR,
 			done: func(f *os.File) {
 				r.Stdout = filepath.Join(dir, "stdout")
-				go func() {
-					io.Copy(os.Stdout, f)
-					wg.Done()
-				}()
+				go io.Copy(os.Stdout, f)
 			},
 		},
 		{
@@ -130,10 +136,7 @@ func attachStdio(r *types.CreateContainerRequest, wg *sync.WaitGroup) error {
 			flag: syscall.O_RDWR,
 			done: func(f *os.File) {
 				r.Stderr = filepath.Join(dir, "stderr")
-				go func() {
-					io.Copy(os.Stderr, f)
-					wg.Done()
-				}()
+				go io.Copy(os.Stderr, f)
 			},
 		},
 	} {

event.go

@@ -38,6 +38,7 @@ type Event struct {
 	BundlePath string
 	Stdout     string
 	Stderr     string
+	Stdin      string
 	Pid        int
 	Status     int
 	Signal     os.Signal

io.go

@@ -8,20 +8,31 @@ import (
 type ioConfig struct {
 	StdoutPath string
 	StderrPath string
-	Stdin      io.WriteCloser
-	Stdout     io.ReadCloser
-	Stderr     io.ReadCloser
+	StdinPath  string
+
+	Stdin  io.WriteCloser
+	Stdout io.ReadCloser
+	Stderr io.ReadCloser
 }
 
 func newCopier(i *ioConfig) (*copier, error) {
 	l := &copier{
 		config: i,
 	}
+	if i.StdinPath != "" {
+		f, err := os.OpenFile(i.StdinPath, os.O_RDONLY, 0)
+		if err != nil {
+			return nil, err
+		}
+		l.closers = append(l.closers, f)
+		go io.Copy(i.Stdin, f)
+	}
 	if i.StdoutPath != "" {
 		f, err := os.OpenFile(i.StdoutPath, os.O_RDWR, 0)
 		if err != nil {
 			return nil, err
 		}
+		l.closers = append(l.closers, f)
 		go io.Copy(f, i.Stdout)
 	}
 	if i.StderrPath != "" {
@@ -29,21 +40,19 @@ func newCopier(i *ioConfig) (*copier, error) {
 		if err != nil {
 			return nil, err
 		}
+		l.closers = append(l.closers, f)
 		go io.Copy(f, i.Stderr)
 	}
 	return l, nil
 }
 
 type copier struct {
-	config *ioConfig
+	config  *ioConfig
+	closers []io.Closer
 }
 
 func (l *copier) Close() (err error) {
-	for _, c := range []io.Closer{
-		l.config.Stdin,
-		l.config.Stdout,
-		l.config.Stderr,
-	} {
+	for _, c := range append(l.closers, l.config.Stdin, l.config.Stdout, l.config.Stderr) {
 		if cerr := c.Close(); err == nil {
 			err = cerr
 		}

start.go

@@ -18,6 +18,7 @@ func (h *StartEvent) Handle(e *Event) error {
 		Err:       e.Err,
 		IO:        io,
 		Container: container,
+		Stdin:     e.Stdin,
 		Stdout:    e.Stdout,
 		Stderr:    e.Stderr,
 	}

supervisor.go

@@ -222,13 +222,14 @@ func (s *Supervisor) SendEvent(evt *Event) {
 	s.events <- evt
 }
 
-func (s *Supervisor) copyIO(stdout, stderr string, i *runtime.IO) (*copier, error) {
+func (s *Supervisor) copyIO(stdin, stdout, stderr string, i *runtime.IO) (*copier, error) {
 	config := &ioConfig{
 		Stdin:      i.Stdin,
 		Stdout:     i.Stdout,
 		Stderr:     i.Stderr,
 		StdoutPath: stdout,
 		StderrPath: stderr,
+		StdinPath:  stdin,
 	}
 	l, err := newCopier(config)
 	if err != nil {

worker.go

@@ -15,6 +15,7 @@ type StartTask struct {
 	Container  runtime.Container
 	Checkpoint string
 	IO         *runtime.IO
+	Stdin      string
 	Stdout     string
 	Stderr     string
 	Err        chan error
@@ -36,7 +37,7 @@ func (w *worker) Start() {
 	defer w.wg.Done()
 	for t := range w.s.tasks {
 		started := time.Now()
-		l, err := w.s.copyIO(t.Stdout, t.Stderr, t.IO)
+		l, err := w.s.copyIO(t.Stdin, t.Stdout, t.Stderr, t.IO)
 		if err != nil {
 			evt := NewEvent(DeleteEventType)
 			evt.ID = t.Container.ID()