1 files changed, 159 insertions, 0 deletions
diff --git a/pkg/adapter/terminal.go b/pkg/adapter/terminal.go
new file mode 100644
index 000000000..0b608decf
--- /dev/null
+++ b/pkg/adapter/terminal.go
@@ -0,0 +1,159 @@
+package adapter
+
+import (
+	"context"
+	"fmt"
+	"os"
+	gosignal "os/signal"
+
+	"github.com/containers/libpod/libpod"
+	"github.com/docker/docker/pkg/signal"
+	"github.com/docker/docker/pkg/term"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/crypto/ssh/terminal"
+	"k8s.io/client-go/tools/remotecommand"
+)
+
+// RawTtyFormatter ...
+type RawTtyFormatter struct {
+}
+
+// StartAttachCtr starts and (if required) attaches to a container
+func StartAttachCtr(ctx context.Context, ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool, startContainer bool, recursive bool) error {
+	resize := make(chan remotecommand.TerminalSize)
+
+	haveTerminal := terminal.IsTerminal(int(os.Stdin.Fd()))
+
+	// Check if we are attached to a terminal. If we are, generate resize
+	// events, and set the terminal to raw mode
+	if haveTerminal && ctr.Spec().Process.Terminal {
+		logrus.Debugf("Handling terminal attach")
+
+		subCtx, cancel := context.WithCancel(ctx)
+		defer cancel()
+
+		resizeTty(subCtx, resize)
+
+		oldTermState, err := term.SaveState(os.Stdin.Fd())
+		if err != nil {
+			return errors.Wrapf(err, "unable to save terminal state")
+		}
+
+		logrus.SetFormatter(&RawTtyFormatter{})
+		term.SetRawTerminal(os.Stdin.Fd())
+
+		defer restoreTerminal(oldTermState)
+	}
+
+	streams := new(libpod.AttachStreams)
+	streams.OutputStream = stdout
+	streams.ErrorStream = stderr
+	streams.InputStream = stdin
+	streams.AttachOutput = true
+	streams.AttachError = true
+	streams.AttachInput = true
+
+	if stdout == nil {
+		logrus.Debugf("Not attaching to stdout")
+		streams.AttachOutput = false
+	}
+	if stderr == nil {
+		logrus.Debugf("Not attaching to stderr")
+		streams.AttachError = false
+	}
+	if stdin == nil {
+		logrus.Debugf("Not attaching to stdin")
+		streams.AttachInput = false
+	}
+
+	if !startContainer {
+		if sigProxy {
+			ProxySignals(ctr)
+		}
+
+		return ctr.Attach(streams, detachKeys, resize)
+	}
+
+	attachChan, err := ctr.StartAndAttach(ctx, streams, detachKeys, resize, recursive)
+	if err != nil {
+		return err
+	}
+
+	if sigProxy {
+		ProxySignals(ctr)
+	}
+
+	if stdout == nil && stderr == nil {
+		fmt.Printf("%s\n", ctr.ID())
+	}
+
+	err = <-attachChan
+	if err != nil {
+		return errors.Wrapf(err, "error attaching to container %s", ctr.ID())
+	}
+
+	return nil
+}
+
+// getResize returns a TerminalSize command matching stdin's current
+// size on success, and nil on errors.
+func getResize() *remotecommand.TerminalSize {
+	winsize, err := term.GetWinsize(os.Stdin.Fd())
+	if err != nil {
+		logrus.Warnf("Could not get terminal size %v", err)
+		return nil
+	}
+	return &remotecommand.TerminalSize{
+		Width:  winsize.Width,
+		Height: winsize.Height,
+	}
+}
+
+// Helper for prepareAttach - set up a goroutine to generate terminal resize events
+func resizeTty(ctx context.Context, resize chan remotecommand.TerminalSize) {
+	sigchan := make(chan os.Signal, 1)
+	gosignal.Notify(sigchan, signal.SIGWINCH)
+	go func() {
+		defer close(resize)
+		// Update the terminal size immediately without waiting
+		// for a SIGWINCH to get the correct initial size.
+		resizeEvent := getResize()
+		for {
+			if resizeEvent == nil {
+				select {
+				case <-ctx.Done():
+					return
+				case <-sigchan:
+					resizeEvent = getResize()
+				}
+			} else {
+				select {
+				case <-ctx.Done():
+					return
+				case <-sigchan:
+					resizeEvent = getResize()
+				case resize <- *resizeEvent:
+					resizeEvent = nil
+				}
+			}
+		}
+	}()
+}
+
+func restoreTerminal(state *term.State) error {
+	logrus.SetFormatter(&logrus.TextFormatter{})
+	return term.RestoreTerminal(os.Stdin.Fd(), state)
+}
+
+// Format ...
+func (f *RawTtyFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	textFormatter := logrus.TextFormatter{}
+	bytes, err := textFormatter.Format(entry)
+
+	if err == nil {
+		bytes = append(bytes, '\r')
+	}
+
+	return bytes, err
+}