Move execdrivers into runtime top level pkg

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

runtime/execdriver/native/term.go

@@ -0,0 +1,42 @@
+/*
+   These types are wrappers around the libcontainer Terminal interface so that
+   we can resuse the docker implementations where possible.
+*/
+package native
+
+import (
+	"github.com/dotcloud/docker/runtime/execdriver"
+	"io"
+	"os"
+	"os/exec"
+)
+
+type dockerStdTerm struct {
+	execdriver.StdConsole
+	pipes *execdriver.Pipes
+}
+
+func (d *dockerStdTerm) Attach(cmd *exec.Cmd) error {
+	return d.AttachPipes(cmd, d.pipes)
+}
+
+func (d *dockerStdTerm) SetMaster(master *os.File) {
+	// do nothing
+}
+
+type dockerTtyTerm struct {
+	execdriver.TtyConsole
+	pipes *execdriver.Pipes
+}
+
+func (t *dockerTtyTerm) Attach(cmd *exec.Cmd) error {
+	go io.Copy(t.pipes.Stdout, t.MasterPty)
+	if t.pipes.Stdin != nil {
+		go io.Copy(t.MasterPty, t.pipes.Stdin)
+	}
+	return nil
+}
+
+func (t *dockerTtyTerm) SetMaster(master *os.File) {
+	t.MasterPty = master
+}