Add console pkg and update go-runc

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

vendor/github.com/crosbymichael/console/tc.go

@@ -0,0 +1,52 @@
+// +build linux
+
+package console
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+func tcget(fd uintptr, p *syscall.Termios) error {
+	return ioctl(fd, syscall.TCGETS, uintptr(unsafe.Pointer(p)))
+}
+
+func tcset(fd uintptr, p *syscall.Termios) error {
+	return ioctl(fd, syscall.TCSETS, uintptr(unsafe.Pointer(p)))
+}
+
+func ioctl(fd, flag, data uintptr) error {
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, flag, data); err != 0 {
+		return err
+	}
+	return nil
+}
+
+// unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
+// unlockpt should be called before opening the slave side of a pty.
+func unlockpt(f *os.File) error {
+	var u int32
+	return ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
+}
+
+// ptsname retrieves the name of the first available pts for the given master.
+func ptsname(f *os.File) (string, error) {
+	var n int32
+	if err := ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("/dev/pts/%d", n), nil
+}
+
+func saneTerminal(f *os.File) error {
+	// Go doesn't have a wrapper for any of the termios ioctls.
+	var termios syscall.Termios
+	if err := tcget(f.Fd(), &termios); err != nil {
+		return err
+	}
+	// Set -onlcr so we don't have to deal with \r.
+	termios.Oflag &^= syscall.ONLCR
+	return tcset(f.Fd(), &termios)
+}