@@ -238,11 +238,13 @@ definitions:

           - `bind` Mounts a file or directory from the host into the container. Must exist prior to creating the container.

           - `volume` Creates a volume with the given name and options (or uses a pre-existing volume with the same name and options). These are **not** removed when the container is removed.

           - `tmpfs` Create a tmpfs with the given options. The mount source cannot be specified for tmpfs.

+          - `npipe` Mounts a named pipe from the host into the container. Must exist prior to creating the container.

         type: "string"

         enum:

           - "bind"

           - "volume"

           - "tmpfs"

+          - "npipe"

       ReadOnly:

         description: "Whether the mount should be read-only."

         type: "boolean"

@@ -285,6 +285,8 @@ func convertMount(m api.Mount) enginemount.Mount {

 		mount.Type = enginemount.TypeVolume

 	case api.MountTypeTmpfs:

 		mount.Type = enginemount.TypeTmpfs

+	case api.MountTypeNamedPipe:

+		mount.Type = enginemount.TypeNamedPipe

 	}

 	if m.BindOptions != nil {

@@ -11,7 +11,8 @@ import (

 func validateMounts(mounts []api.Mount) error {

 	for _, mount := range mounts {

 		// Target must always be absolute

-		if !filepath.IsAbs(mount.Target) {

+		// except if target is Windows named pipe

+		if !filepath.IsAbs(mount.Target) && mount.Type != api.MountTypeNamedPipe {

 			return fmt.Errorf("invalid mount target, must be an absolute path: %s", mount.Target)

 		}

@@ -32,6 +33,10 @@ func validateMounts(mounts []api.Mount) error {

 			if mount.Source != "" {

 				return errors.New("invalid tmpfs source, source must be empty")

 			}

+		case api.MountTypeNamedPipe:

+			if mount.Source == "" {

+				return errors.New("invalid npipe source, source must not be empty")

+			}

 		default:

 			return fmt.Errorf("invalid mount type: %s", mount.Type)

 		}

@@ -1,8 +1,24 @@

 // +build windows

 package container // import "github.com/docker/docker/daemon/cluster/executor/container"

+import (

+	"strings"

+	"testing"

+

+	"github.com/docker/swarmkit/api"

+)

 const (

 	testAbsPath        = `c:\foo`

 	testAbsNonExistent = `c:\some-non-existing-host-path\`

 )

+

+func TestControllerValidateMountNamedPipe(t *testing.T) {

+	if _, err := newTestControllerWithMount(api.Mount{

+		Type:   api.MountTypeNamedPipe,

+		Source: "",

+		Target: `\\.\pipe\foo`,

+	}); err == nil || !strings.Contains(err.Error(), "invalid npipe source, source must not be empty") {

+		t.Fatalf("expected error, got: %v", err)

+	}

+}