Update vendors.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/github.com/opencontainers/runc/libcontainer/devices/devices.go

@@ -0,0 +1,104 @@
+package devices
+
+import (
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/opencontainers/runc/libcontainer/configs"
+
+	"golang.org/x/sys/unix"
+)
+
+var (
+	ErrNotADevice = errors.New("not a device node")
+)
+
+// Testing dependencies
+var (
+	unixLstat     = unix.Lstat
+	ioutilReadDir = ioutil.ReadDir
+)
+
+// Given the path to a device and its cgroup_permissions(which cannot be easily queried) look up the information about a linux device and return that information as a Device struct.
+func DeviceFromPath(path, permissions string) (*configs.Device, error) {
+	var stat unix.Stat_t
+	err := unixLstat(path, &stat)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		devNumber = stat.Rdev
+		major     = unix.Major(devNumber)
+	)
+	if major == 0 {
+		return nil, ErrNotADevice
+	}
+
+	var (
+		devType rune
+		mode    = stat.Mode
+	)
+	switch {
+	case mode&unix.S_IFBLK == unix.S_IFBLK:
+		devType = 'b'
+	case mode&unix.S_IFCHR == unix.S_IFCHR:
+		devType = 'c'
+	}
+	return &configs.Device{
+		Type:        devType,
+		Path:        path,
+		Major:       int64(major),
+		Minor:       int64(unix.Minor(devNumber)),
+		Permissions: permissions,
+		FileMode:    os.FileMode(mode),
+		Uid:         stat.Uid,
+		Gid:         stat.Gid,
+	}, nil
+}
+
+func HostDevices() ([]*configs.Device, error) {
+	return getDevices("/dev")
+}
+
+func getDevices(path string) ([]*configs.Device, error) {
+	files, err := ioutilReadDir(path)
+	if err != nil {
+		return nil, err
+	}
+	out := []*configs.Device{}
+	for _, f := range files {
+		switch {
+		case f.IsDir():
+			switch f.Name() {
+			// ".lxc" & ".lxd-mounts" added to address https://github.com/lxc/lxd/issues/2825
+			case "pts", "shm", "fd", "mqueue", ".lxc", ".lxd-mounts":
+				continue
+			default:
+				sub, err := getDevices(filepath.Join(path, f.Name()))
+				if err != nil {
+					return nil, err
+				}
+
+				out = append(out, sub...)
+				continue
+			}
+		case f.Name() == "console":
+			continue
+		}
+		device, err := DeviceFromPath(filepath.Join(path, f.Name()), "rwm")
+		if err != nil {
+			if err == ErrNotADevice {
+				continue
+			}
+			if os.IsNotExist(err) {
+				continue
+			}
+			return nil, err
+		}
+		out = append(out, device)
+	}
+	return out, nil
+}