*: switch from godep to glide

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/apply_raw.go

@@ -0,0 +1,405 @@
+// +build linux
+
+package fs
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	libcontainerUtils "github.com/opencontainers/runc/libcontainer/utils"
+)
+
+var (
+	subsystems = subsystemSet{
+		&CpusetGroup{},
+		&DevicesGroup{},
+		&MemoryGroup{},
+		&CpuGroup{},
+		&CpuacctGroup{},
+		&PidsGroup{},
+		&BlkioGroup{},
+		&HugetlbGroup{},
+		&NetClsGroup{},
+		&NetPrioGroup{},
+		&PerfEventGroup{},
+		&FreezerGroup{},
+		&NameGroup{GroupName: "name=systemd", Join: true},
+	}
+	HugePageSizes, _ = cgroups.GetHugePageSize()
+)
+
+var errSubsystemDoesNotExist = errors.New("cgroup: subsystem does not exist")
+
+type subsystemSet []subsystem
+
+func (s subsystemSet) Get(name string) (subsystem, error) {
+	for _, ss := range s {
+		if ss.Name() == name {
+			return ss, nil
+		}
+	}
+	return nil, errSubsystemDoesNotExist
+}
+
+type subsystem interface {
+	// Name returns the name of the subsystem.
+	Name() string
+	// Returns the stats, as 'stats', corresponding to the cgroup under 'path'.
+	GetStats(path string, stats *cgroups.Stats) error
+	// Removes the cgroup represented by 'cgroupData'.
+	Remove(*cgroupData) error
+	// Creates and joins the cgroup represented by 'cgroupData'.
+	Apply(*cgroupData) error
+	// Set the cgroup represented by cgroup.
+	Set(path string, cgroup *configs.Cgroup) error
+}
+
+type Manager struct {
+	mu      sync.Mutex
+	Cgroups *configs.Cgroup
+	Paths   map[string]string
+}
+
+// The absolute path to the root of the cgroup hierarchies.
+var cgroupRootLock sync.Mutex
+var cgroupRoot string
+
+// Gets the cgroupRoot.
+func getCgroupRoot() (string, error) {
+	cgroupRootLock.Lock()
+	defer cgroupRootLock.Unlock()
+
+	if cgroupRoot != "" {
+		return cgroupRoot, nil
+	}
+
+	root, err := cgroups.FindCgroupMountpointDir()
+	if err != nil {
+		return "", err
+	}
+
+	if _, err := os.Stat(root); err != nil {
+		return "", err
+	}
+
+	cgroupRoot = root
+	return cgroupRoot, nil
+}
+
+type cgroupData struct {
+	root      string
+	innerPath string
+	config    *configs.Cgroup
+	pid       int
+}
+
+func (m *Manager) Apply(pid int) (err error) {
+	if m.Cgroups == nil {
+		return nil
+	}
+
+	var c = m.Cgroups
+
+	d, err := getCgroupData(m.Cgroups, pid)
+	if err != nil {
+		return err
+	}
+
+	if c.Paths != nil {
+		paths := make(map[string]string)
+		for name, path := range c.Paths {
+			_, err := d.path(name)
+			if err != nil {
+				if cgroups.IsNotFound(err) {
+					continue
+				}
+				return err
+			}
+			paths[name] = path
+		}
+		m.Paths = paths
+		return cgroups.EnterPid(m.Paths, pid)
+	}
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	paths := make(map[string]string)
+	for _, sys := range subsystems {
+		if err := sys.Apply(d); err != nil {
+			return err
+		}
+		// TODO: Apply should, ideally, be reentrant or be broken up into a separate
+		// create and join phase so that the cgroup hierarchy for a container can be
+		// created then join consists of writing the process pids to cgroup.procs
+		p, err := d.path(sys.Name())
+		if err != nil {
+			// The non-presence of the devices subsystem is
+			// considered fatal for security reasons.
+			if cgroups.IsNotFound(err) && sys.Name() != "devices" {
+				continue
+			}
+			return err
+		}
+		paths[sys.Name()] = p
+	}
+	m.Paths = paths
+	return nil
+}
+
+func (m *Manager) Destroy() error {
+	if m.Cgroups.Paths != nil {
+		return nil
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if err := cgroups.RemovePaths(m.Paths); err != nil {
+		return err
+	}
+	m.Paths = make(map[string]string)
+	return nil
+}
+
+func (m *Manager) GetPaths() map[string]string {
+	m.mu.Lock()
+	paths := m.Paths
+	m.mu.Unlock()
+	return paths
+}
+
+func (m *Manager) GetStats() (*cgroups.Stats, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	stats := cgroups.NewStats()
+	for name, path := range m.Paths {
+		sys, err := subsystems.Get(name)
+		if err == errSubsystemDoesNotExist || !cgroups.PathExists(path) {
+			continue
+		}
+		if err := sys.GetStats(path, stats); err != nil {
+			return nil, err
+		}
+	}
+	return stats, nil
+}
+
+func (m *Manager) Set(container *configs.Config) error {
+	// If Paths are set, then we are just joining cgroups paths
+	// and there is no need to set any values.
+	if m.Cgroups.Paths != nil {
+		return nil
+	}
+	for _, sys := range subsystems {
+		// Generate fake cgroup data.
+		d, err := getCgroupData(container.Cgroups, -1)
+		if err != nil {
+			return err
+		}
+		// Get the path, but don't error out if the cgroup wasn't found.
+		path, err := d.path(sys.Name())
+		if err != nil && !cgroups.IsNotFound(err) {
+			return err
+		}
+
+		if err := sys.Set(path, container.Cgroups); err != nil {
+			return err
+		}
+	}
+
+	if m.Paths["cpu"] != "" {
+		if err := CheckCpushares(m.Paths["cpu"], container.Cgroups.Resources.CpuShares); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Freeze toggles the container's freezer cgroup depending on the state
+// provided
+func (m *Manager) Freeze(state configs.FreezerState) error {
+	d, err := getCgroupData(m.Cgroups, 0)
+	if err != nil {
+		return err
+	}
+	dir, err := d.path("freezer")
+	if err != nil {
+		return err
+	}
+	prevState := m.Cgroups.Resources.Freezer
+	m.Cgroups.Resources.Freezer = state
+	freezer, err := subsystems.Get("freezer")
+	if err != nil {
+		return err
+	}
+	err = freezer.Set(dir, m.Cgroups)
+	if err != nil {
+		m.Cgroups.Resources.Freezer = prevState
+		return err
+	}
+	return nil
+}
+
+func (m *Manager) GetPids() ([]int, error) {
+	dir, err := getCgroupPath(m.Cgroups)
+	if err != nil {
+		return nil, err
+	}
+	return cgroups.GetPids(dir)
+}
+
+func (m *Manager) GetAllPids() ([]int, error) {
+	dir, err := getCgroupPath(m.Cgroups)
+	if err != nil {
+		return nil, err
+	}
+	return cgroups.GetAllPids(dir)
+}
+
+func getCgroupPath(c *configs.Cgroup) (string, error) {
+	d, err := getCgroupData(c, 0)
+	if err != nil {
+		return "", err
+	}
+
+	return d.path("devices")
+}
+
+func getCgroupData(c *configs.Cgroup, pid int) (*cgroupData, error) {
+	root, err := getCgroupRoot()
+	if err != nil {
+		return nil, err
+	}
+
+	if (c.Name != "" || c.Parent != "") && c.Path != "" {
+		return nil, fmt.Errorf("cgroup: either Path or Name and Parent should be used")
+	}
+
+	// XXX: Do not remove this code. Path safety is important! -- cyphar
+	cgPath := libcontainerUtils.CleanPath(c.Path)
+	cgParent := libcontainerUtils.CleanPath(c.Parent)
+	cgName := libcontainerUtils.CleanPath(c.Name)
+
+	innerPath := cgPath
+	if innerPath == "" {
+		innerPath = filepath.Join(cgParent, cgName)
+	}
+
+	return &cgroupData{
+		root:      root,
+		innerPath: innerPath,
+		config:    c,
+		pid:       pid,
+	}, nil
+}
+
+func (raw *cgroupData) parentPath(subsystem, mountpoint, root string) (string, error) {
+	// Use GetThisCgroupDir instead of GetInitCgroupDir, because the creating
+	// process could in container and shared pid namespace with host, and
+	// /proc/1/cgroup could point to whole other world of cgroups.
+	initPath, err := cgroups.GetThisCgroupDir(subsystem)
+	if err != nil {
+		return "", err
+	}
+	// This is needed for nested containers, because in /proc/self/cgroup we
+	// see pathes from host, which don't exist in container.
+	relDir, err := filepath.Rel(root, initPath)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(mountpoint, relDir), nil
+}
+
+func (raw *cgroupData) path(subsystem string) (string, error) {
+	mnt, root, err := cgroups.FindCgroupMountpointAndRoot(subsystem)
+	// If we didn't mount the subsystem, there is no point we make the path.
+	if err != nil {
+		return "", err
+	}
+
+	// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
+	if filepath.IsAbs(raw.innerPath) {
+		// Sometimes subsystems can be mounted togethger as 'cpu,cpuacct'.
+		return filepath.Join(raw.root, filepath.Base(mnt), raw.innerPath), nil
+	}
+
+	parentPath, err := raw.parentPath(subsystem, mnt, root)
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(parentPath, raw.innerPath), nil
+}
+
+func (raw *cgroupData) join(subsystem string) (string, error) {
+	path, err := raw.path(subsystem)
+	if err != nil {
+		return "", err
+	}
+	if err := os.MkdirAll(path, 0755); err != nil {
+		return "", err
+	}
+	if err := cgroups.WriteCgroupProc(path, raw.pid); err != nil {
+		return "", err
+	}
+	return path, nil
+}
+
+func writeFile(dir, file, data string) error {
+	// Normally dir should not be empty, one case is that cgroup subsystem
+	// is not mounted, we will get empty dir, and we want it fail here.
+	if dir == "" {
+		return fmt.Errorf("no such directory for %s", file)
+	}
+	if err := ioutil.WriteFile(filepath.Join(dir, file), []byte(data), 0700); err != nil {
+		return fmt.Errorf("failed to write %v to %v: %v", data, file, err)
+	}
+	return nil
+}
+
+func readFile(dir, file string) (string, error) {
+	data, err := ioutil.ReadFile(filepath.Join(dir, file))
+	return string(data), err
+}
+
+func removePath(p string, err error) error {
+	if err != nil {
+		return err
+	}
+	if p != "" {
+		return os.RemoveAll(p)
+	}
+	return nil
+}
+
+func CheckCpushares(path string, c int64) error {
+	var cpuShares int64
+
+	if c == 0 {
+		return nil
+	}
+
+	fd, err := os.Open(filepath.Join(path, "cpu.shares"))
+	if err != nil {
+		return err
+	}
+	defer fd.Close()
+
+	_, err = fmt.Fscanf(fd, "%d", &cpuShares)
+	if err != nil && err != io.EOF {
+		return err
+	}
+
+	if c > cpuShares {
+		return fmt.Errorf("The maximum allowed cpu-shares is %d", cpuShares)
+	} else if c < cpuShares {
+		return fmt.Errorf("The minimum allowed cpu-shares is %d", cpuShares)
+	}
+
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/blkio.go

@@ -0,0 +1,237 @@
+// +build linux
+
+package fs
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type BlkioGroup struct {
+}
+
+func (s *BlkioGroup) Name() string {
+	return "blkio"
+}
+
+func (s *BlkioGroup) Apply(d *cgroupData) error {
+	_, err := d.join("blkio")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *BlkioGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if cgroup.Resources.BlkioWeight != 0 {
+		if err := writeFile(path, "blkio.weight", strconv.FormatUint(uint64(cgroup.Resources.BlkioWeight), 10)); err != nil {
+			return err
+		}
+	}
+
+	if cgroup.Resources.BlkioLeafWeight != 0 {
+		if err := writeFile(path, "blkio.leaf_weight", strconv.FormatUint(uint64(cgroup.Resources.BlkioLeafWeight), 10)); err != nil {
+			return err
+		}
+	}
+	for _, wd := range cgroup.Resources.BlkioWeightDevice {
+		if err := writeFile(path, "blkio.weight_device", wd.WeightString()); err != nil {
+			return err
+		}
+		if err := writeFile(path, "blkio.leaf_weight_device", wd.LeafWeightString()); err != nil {
+			return err
+		}
+	}
+	for _, td := range cgroup.Resources.BlkioThrottleReadBpsDevice {
+		if err := writeFile(path, "blkio.throttle.read_bps_device", td.String()); err != nil {
+			return err
+		}
+	}
+	for _, td := range cgroup.Resources.BlkioThrottleWriteBpsDevice {
+		if err := writeFile(path, "blkio.throttle.write_bps_device", td.String()); err != nil {
+			return err
+		}
+	}
+	for _, td := range cgroup.Resources.BlkioThrottleReadIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.read_iops_device", td.String()); err != nil {
+			return err
+		}
+	}
+	for _, td := range cgroup.Resources.BlkioThrottleWriteIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.write_iops_device", td.String()); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *BlkioGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("blkio"))
+}
+
+/*
+examples:
+
+    blkio.sectors
+    8:0 6792
+
+    blkio.io_service_bytes
+    8:0 Read 1282048
+    8:0 Write 2195456
+    8:0 Sync 2195456
+    8:0 Async 1282048
+    8:0 Total 3477504
+    Total 3477504
+
+    blkio.io_serviced
+    8:0 Read 124
+    8:0 Write 104
+    8:0 Sync 104
+    8:0 Async 124
+    8:0 Total 228
+    Total 228
+
+    blkio.io_queued
+    8:0 Read 0
+    8:0 Write 0
+    8:0 Sync 0
+    8:0 Async 0
+    8:0 Total 0
+    Total 0
+*/
+
+func splitBlkioStatLine(r rune) bool {
+	return r == ' ' || r == ':'
+}
+
+func getBlkioStat(path string) ([]cgroups.BlkioStatEntry, error) {
+	var blkioStats []cgroups.BlkioStatEntry
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return blkioStats, nil
+		}
+		return nil, err
+	}
+	defer f.Close()
+
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		// format: dev type amount
+		fields := strings.FieldsFunc(sc.Text(), splitBlkioStatLine)
+		if len(fields) < 3 {
+			if len(fields) == 2 && fields[0] == "Total" {
+				// skip total line
+				continue
+			} else {
+				return nil, fmt.Errorf("Invalid line found while parsing %s: %s", path, sc.Text())
+			}
+		}
+
+		v, err := strconv.ParseUint(fields[0], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		major := v
+
+		v, err = strconv.ParseUint(fields[1], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		minor := v
+
+		op := ""
+		valueField := 2
+		if len(fields) == 4 {
+			op = fields[2]
+			valueField = 3
+		}
+		v, err = strconv.ParseUint(fields[valueField], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		blkioStats = append(blkioStats, cgroups.BlkioStatEntry{Major: major, Minor: minor, Op: op, Value: v})
+	}
+
+	return blkioStats, nil
+}
+
+func (s *BlkioGroup) GetStats(path string, stats *cgroups.Stats) error {
+	// Try to read CFQ stats available on all CFQ enabled kernels first
+	if blkioStats, err := getBlkioStat(filepath.Join(path, "blkio.io_serviced_recursive")); err == nil && blkioStats != nil {
+		return getCFQStats(path, stats)
+	}
+	return getStats(path, stats) // Use generic stats as fallback
+}
+
+func getCFQStats(path string, stats *cgroups.Stats) error {
+	var blkioStats []cgroups.BlkioStatEntry
+	var err error
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.sectors_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.SectorsRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_service_bytes_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoServiceBytesRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_serviced_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoServicedRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_queued_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoQueuedRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_service_time_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoServiceTimeRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_wait_time_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoWaitTimeRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_merged_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoMergedRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.time_recursive")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoTimeRecursive = blkioStats
+
+	return nil
+}
+
+func getStats(path string, stats *cgroups.Stats) error {
+	var blkioStats []cgroups.BlkioStatEntry
+	var err error
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.throttle.io_service_bytes")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoServiceBytesRecursive = blkioStats
+
+	if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.throttle.io_serviced")); err != nil {
+		return err
+	}
+	stats.BlkioStats.IoServicedRecursive = blkioStats
+
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/cpu.go

@@ -0,0 +1,94 @@
+// +build linux
+
+package fs
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type CpuGroup struct {
+}
+
+func (s *CpuGroup) Name() string {
+	return "cpu"
+}
+
+func (s *CpuGroup) Apply(d *cgroupData) error {
+	// We always want to join the cpu group, to allow fair cpu scheduling
+	// on a container basis
+	_, err := d.join("cpu")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *CpuGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if cgroup.Resources.CpuShares != 0 {
+		if err := writeFile(path, "cpu.shares", strconv.FormatInt(cgroup.Resources.CpuShares, 10)); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.CpuPeriod != 0 {
+		if err := writeFile(path, "cpu.cfs_period_us", strconv.FormatInt(cgroup.Resources.CpuPeriod, 10)); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.CpuQuota != 0 {
+		if err := writeFile(path, "cpu.cfs_quota_us", strconv.FormatInt(cgroup.Resources.CpuQuota, 10)); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.CpuRtPeriod != 0 {
+		if err := writeFile(path, "cpu.rt_period_us", strconv.FormatInt(cgroup.Resources.CpuRtPeriod, 10)); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.CpuRtRuntime != 0 {
+		if err := writeFile(path, "cpu.rt_runtime_us", strconv.FormatInt(cgroup.Resources.CpuRtRuntime, 10)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *CpuGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("cpu"))
+}
+
+func (s *CpuGroup) GetStats(path string, stats *cgroups.Stats) error {
+	f, err := os.Open(filepath.Join(path, "cpu.stat"))
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+	defer f.Close()
+
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		t, v, err := getCgroupParamKeyValue(sc.Text())
+		if err != nil {
+			return err
+		}
+		switch t {
+		case "nr_periods":
+			stats.CpuStats.ThrottlingData.Periods = v
+
+		case "nr_throttled":
+			stats.CpuStats.ThrottlingData.ThrottledPeriods = v
+
+		case "throttled_time":
+			stats.CpuStats.ThrottlingData.ThrottledTime = v
+		}
+	}
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/cpuacct.go

@@ -0,0 +1,121 @@
+// +build linux
+
+package fs
+
+import (
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	"github.com/opencontainers/runc/libcontainer/system"
+)
+
+const (
+	cgroupCpuacctStat   = "cpuacct.stat"
+	nanosecondsInSecond = 1000000000
+)
+
+var clockTicks = uint64(system.GetClockTicks())
+
+type CpuacctGroup struct {
+}
+
+func (s *CpuacctGroup) Name() string {
+	return "cpuacct"
+}
+
+func (s *CpuacctGroup) Apply(d *cgroupData) error {
+	// we just want to join this group even though we don't set anything
+	if _, err := d.join("cpuacct"); err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+
+	return nil
+}
+
+func (s *CpuacctGroup) Set(path string, cgroup *configs.Cgroup) error {
+	return nil
+}
+
+func (s *CpuacctGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("cpuacct"))
+}
+
+func (s *CpuacctGroup) GetStats(path string, stats *cgroups.Stats) error {
+	userModeUsage, kernelModeUsage, err := getCpuUsageBreakdown(path)
+	if err != nil {
+		return err
+	}
+
+	totalUsage, err := getCgroupParamUint(path, "cpuacct.usage")
+	if err != nil {
+		return err
+	}
+
+	percpuUsage, err := getPercpuUsage(path)
+	if err != nil {
+		return err
+	}
+
+	stats.CpuStats.CpuUsage.TotalUsage = totalUsage
+	stats.CpuStats.CpuUsage.PercpuUsage = percpuUsage
+	stats.CpuStats.CpuUsage.UsageInUsermode = userModeUsage
+	stats.CpuStats.CpuUsage.UsageInKernelmode = kernelModeUsage
+	return nil
+}
+
+// Returns user and kernel usage breakdown in nanoseconds.
+func getCpuUsageBreakdown(path string) (uint64, uint64, error) {
+	userModeUsage := uint64(0)
+	kernelModeUsage := uint64(0)
+	const (
+		userField   = "user"
+		systemField = "system"
+	)
+
+	// Expected format:
+	// user <usage in ticks>
+	// system <usage in ticks>
+	data, err := ioutil.ReadFile(filepath.Join(path, cgroupCpuacctStat))
+	if err != nil {
+		return 0, 0, err
+	}
+	fields := strings.Fields(string(data))
+	if len(fields) != 4 {
+		return 0, 0, fmt.Errorf("failure - %s is expected to have 4 fields", filepath.Join(path, cgroupCpuacctStat))
+	}
+	if fields[0] != userField {
+		return 0, 0, fmt.Errorf("unexpected field %q in %q, expected %q", fields[0], cgroupCpuacctStat, userField)
+	}
+	if fields[2] != systemField {
+		return 0, 0, fmt.Errorf("unexpected field %q in %q, expected %q", fields[2], cgroupCpuacctStat, systemField)
+	}
+	if userModeUsage, err = strconv.ParseUint(fields[1], 10, 64); err != nil {
+		return 0, 0, err
+	}
+	if kernelModeUsage, err = strconv.ParseUint(fields[3], 10, 64); err != nil {
+		return 0, 0, err
+	}
+
+	return (userModeUsage * nanosecondsInSecond) / clockTicks, (kernelModeUsage * nanosecondsInSecond) / clockTicks, nil
+}
+
+func getPercpuUsage(path string) ([]uint64, error) {
+	percpuUsage := []uint64{}
+	data, err := ioutil.ReadFile(filepath.Join(path, "cpuacct.usage_percpu"))
+	if err != nil {
+		return percpuUsage, err
+	}
+	for _, value := range strings.Fields(string(data)) {
+		value, err := strconv.ParseUint(value, 10, 64)
+		if err != nil {
+			return percpuUsage, fmt.Errorf("Unable to convert param value to uint64: %s", err)
+		}
+		percpuUsage = append(percpuUsage, value)
+	}
+	return percpuUsage, nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/cpuset.go

@@ -0,0 +1,138 @@
+// +build linux
+
+package fs
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	libcontainerUtils "github.com/opencontainers/runc/libcontainer/utils"
+)
+
+type CpusetGroup struct {
+}
+
+func (s *CpusetGroup) Name() string {
+	return "cpuset"
+}
+
+func (s *CpusetGroup) Apply(d *cgroupData) error {
+	dir, err := d.path("cpuset")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return s.ApplyDir(dir, d.config, d.pid)
+}
+
+func (s *CpusetGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if cgroup.Resources.CpusetCpus != "" {
+		if err := writeFile(path, "cpuset.cpus", cgroup.Resources.CpusetCpus); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.CpusetMems != "" {
+		if err := writeFile(path, "cpuset.mems", cgroup.Resources.CpusetMems); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *CpusetGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("cpuset"))
+}
+
+func (s *CpusetGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}
+
+func (s *CpusetGroup) ApplyDir(dir string, cgroup *configs.Cgroup, pid int) error {
+	// This might happen if we have no cpuset cgroup mounted.
+	// Just do nothing and don't fail.
+	if dir == "" {
+		return nil
+	}
+	root, err := getCgroupRoot()
+	if err != nil {
+		return err
+	}
+	if err := s.ensureParent(dir, root); err != nil {
+		return err
+	}
+	// because we are not using d.join we need to place the pid into the procs file
+	// unlike the other subsystems
+	if err := cgroups.WriteCgroupProc(dir, pid); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *CpusetGroup) getSubsystemSettings(parent string) (cpus []byte, mems []byte, err error) {
+	if cpus, err = ioutil.ReadFile(filepath.Join(parent, "cpuset.cpus")); err != nil {
+		return
+	}
+	if mems, err = ioutil.ReadFile(filepath.Join(parent, "cpuset.mems")); err != nil {
+		return
+	}
+	return cpus, mems, nil
+}
+
+// ensureParent makes sure that the parent directory of current is created
+// and populated with the proper cpus and mems files copied from
+// it's parent.
+func (s *CpusetGroup) ensureParent(current, root string) error {
+	parent := filepath.Dir(current)
+	if libcontainerUtils.CleanPath(parent) == root {
+		return nil
+	}
+	// Avoid infinite recursion.
+	if parent == current {
+		return fmt.Errorf("cpuset: cgroup parent path outside cgroup root")
+	}
+	if err := s.ensureParent(parent, root); err != nil {
+		return err
+	}
+	if err := os.MkdirAll(current, 0755); err != nil {
+		return err
+	}
+	return s.copyIfNeeded(current, parent)
+}
+
+// copyIfNeeded copies the cpuset.cpus and cpuset.mems from the parent
+// directory to the current directory if the file's contents are 0
+func (s *CpusetGroup) copyIfNeeded(current, parent string) error {
+	var (
+		err                      error
+		currentCpus, currentMems []byte
+		parentCpus, parentMems   []byte
+	)
+
+	if currentCpus, currentMems, err = s.getSubsystemSettings(current); err != nil {
+		return err
+	}
+	if parentCpus, parentMems, err = s.getSubsystemSettings(parent); err != nil {
+		return err
+	}
+
+	if s.isEmpty(currentCpus) {
+		if err := writeFile(current, "cpuset.cpus", string(parentCpus)); err != nil {
+			return err
+		}
+	}
+	if s.isEmpty(currentMems) {
+		if err := writeFile(current, "cpuset.mems", string(parentMems)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *CpusetGroup) isEmpty(b []byte) bool {
+	return len(bytes.Trim(b, "\n")) == 0
+}

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

@@ -0,0 +1,80 @@
+// +build linux
+
+package fs
+
+import (
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	"github.com/opencontainers/runc/libcontainer/system"
+)
+
+type DevicesGroup struct {
+}
+
+func (s *DevicesGroup) Name() string {
+	return "devices"
+}
+
+func (s *DevicesGroup) Apply(d *cgroupData) error {
+	_, err := d.join("devices")
+	if err != nil {
+		// We will return error even it's `not found` error, devices
+		// cgroup is hard requirement for container's security.
+		return err
+	}
+	return nil
+}
+
+func (s *DevicesGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if system.RunningInUserNS() {
+		return nil
+	}
+
+	devices := cgroup.Resources.Devices
+	if len(devices) > 0 {
+		for _, dev := range devices {
+			file := "devices.deny"
+			if dev.Allow {
+				file = "devices.allow"
+			}
+			if err := writeFile(path, file, dev.CgroupString()); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+	if cgroup.Resources.AllowAllDevices != nil {
+		if *cgroup.Resources.AllowAllDevices == false {
+			if err := writeFile(path, "devices.deny", "a"); err != nil {
+				return err
+			}
+
+			for _, dev := range cgroup.Resources.AllowedDevices {
+				if err := writeFile(path, "devices.allow", dev.CgroupString()); err != nil {
+					return err
+				}
+			}
+			return nil
+		}
+
+		if err := writeFile(path, "devices.allow", "a"); err != nil {
+			return err
+		}
+	}
+
+	for _, dev := range cgroup.Resources.DeniedDevices {
+		if err := writeFile(path, "devices.deny", dev.CgroupString()); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *DevicesGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("devices"))
+}
+
+func (s *DevicesGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/freezer.go

@@ -0,0 +1,61 @@
+// +build linux
+
+package fs
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type FreezerGroup struct {
+}
+
+func (s *FreezerGroup) Name() string {
+	return "freezer"
+}
+
+func (s *FreezerGroup) Apply(d *cgroupData) error {
+	_, err := d.join("freezer")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *FreezerGroup) Set(path string, cgroup *configs.Cgroup) error {
+	switch cgroup.Resources.Freezer {
+	case configs.Frozen, configs.Thawed:
+		if err := writeFile(path, "freezer.state", string(cgroup.Resources.Freezer)); err != nil {
+			return err
+		}
+
+		for {
+			state, err := readFile(path, "freezer.state")
+			if err != nil {
+				return err
+			}
+			if strings.TrimSpace(state) == string(cgroup.Resources.Freezer) {
+				break
+			}
+			time.Sleep(1 * time.Millisecond)
+		}
+	case configs.Undefined:
+		return nil
+	default:
+		return fmt.Errorf("Invalid argument '%s' to freezer.state", string(cgroup.Resources.Freezer))
+	}
+
+	return nil
+}
+
+func (s *FreezerGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("freezer"))
+}
+
+func (s *FreezerGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/fs_unsupported.go

@@ -0,0 +1,3 @@
+// +build !linux
+
+package fs

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/hugetlb.go

@@ -0,0 +1,71 @@
+// +build linux
+
+package fs
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type HugetlbGroup struct {
+}
+
+func (s *HugetlbGroup) Name() string {
+	return "hugetlb"
+}
+
+func (s *HugetlbGroup) Apply(d *cgroupData) error {
+	_, err := d.join("hugetlb")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *HugetlbGroup) Set(path string, cgroup *configs.Cgroup) error {
+	for _, hugetlb := range cgroup.Resources.HugetlbLimit {
+		if err := writeFile(path, strings.Join([]string{"hugetlb", hugetlb.Pagesize, "limit_in_bytes"}, "."), strconv.FormatUint(hugetlb.Limit, 10)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *HugetlbGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("hugetlb"))
+}
+
+func (s *HugetlbGroup) GetStats(path string, stats *cgroups.Stats) error {
+	hugetlbStats := cgroups.HugetlbStats{}
+	for _, pageSize := range HugePageSizes {
+		usage := strings.Join([]string{"hugetlb", pageSize, "usage_in_bytes"}, ".")
+		value, err := getCgroupParamUint(path, usage)
+		if err != nil {
+			return fmt.Errorf("failed to parse %s - %v", usage, err)
+		}
+		hugetlbStats.Usage = value
+
+		maxUsage := strings.Join([]string{"hugetlb", pageSize, "max_usage_in_bytes"}, ".")
+		value, err = getCgroupParamUint(path, maxUsage)
+		if err != nil {
+			return fmt.Errorf("failed to parse %s - %v", maxUsage, err)
+		}
+		hugetlbStats.MaxUsage = value
+
+		failcnt := strings.Join([]string{"hugetlb", pageSize, "failcnt"}, ".")
+		value, err = getCgroupParamUint(path, failcnt)
+		if err != nil {
+			return fmt.Errorf("failed to parse %s - %v", failcnt, err)
+		}
+		hugetlbStats.Failcnt = value
+
+		stats.HugetlbStats[pageSize] = hugetlbStats
+	}
+
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/memory.go

@@ -0,0 +1,289 @@
+// +build linux
+
+package fs
+
+import (
+	"bufio"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+const (
+	cgroupKernelMemoryLimit = "memory.kmem.limit_in_bytes"
+)
+
+type MemoryGroup struct {
+}
+
+func (s *MemoryGroup) Name() string {
+	return "memory"
+}
+
+func (s *MemoryGroup) Apply(d *cgroupData) (err error) {
+	path, err := d.path("memory")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	if memoryAssigned(d.config) {
+		if path != "" {
+			if err := os.MkdirAll(path, 0755); err != nil {
+				return err
+			}
+		}
+		if err := EnableKernelMemoryAccounting(path); err != nil {
+			return err
+		}
+	}
+	defer func() {
+		if err != nil {
+			os.RemoveAll(path)
+		}
+	}()
+
+	// We need to join memory cgroup after set memory limits, because
+	// kmem.limit_in_bytes can only be set when the cgroup is empty.
+	_, err = d.join("memory")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func EnableKernelMemoryAccounting(path string) error {
+	// Check if kernel memory is enabled
+	// We have to limit the kernel memory here as it won't be accounted at all
+	// until a limit is set on the cgroup and limit cannot be set once the
+	// cgroup has children, or if there are already tasks in the cgroup.
+	kernelMemoryLimit := int64(1)
+	if err := setKernelMemory(path, kernelMemoryLimit); err != nil {
+		return err
+	}
+	kernelMemoryLimit = int64(-1)
+	if err := setKernelMemory(path, kernelMemoryLimit); err != nil {
+		return err
+	}
+	return nil
+}
+
+func setKernelMemory(path string, kernelMemoryLimit int64) error {
+	if path == "" {
+		return fmt.Errorf("no such directory for %s", cgroupKernelMemoryLimit)
+	}
+	if !cgroups.PathExists(filepath.Join(path, cgroupKernelMemoryLimit)) {
+		// kernel memory is not enabled on the system so we should do nothing
+		return nil
+	}
+	if err := ioutil.WriteFile(filepath.Join(path, cgroupKernelMemoryLimit), []byte(strconv.FormatInt(kernelMemoryLimit, 10)), 0700); err != nil {
+		// Check if the error number returned by the syscall is "EBUSY"
+		// The EBUSY signal is returned on attempts to write to the
+		// memory.kmem.limit_in_bytes file if the cgroup has children or
+		// once tasks have been attached to the cgroup
+		if pathErr, ok := err.(*os.PathError); ok {
+			if errNo, ok := pathErr.Err.(syscall.Errno); ok {
+				if errNo == syscall.EBUSY {
+					return fmt.Errorf("failed to set %s, because either tasks have already joined this cgroup or it has children", cgroupKernelMemoryLimit)
+				}
+			}
+		}
+		return fmt.Errorf("failed to write %v to %v: %v", kernelMemoryLimit, cgroupKernelMemoryLimit, err)
+	}
+	return nil
+}
+
+func setMemoryAndSwap(path string, cgroup *configs.Cgroup) error {
+	// When memory and swap memory are both set, we need to handle the cases
+	// for updating container.
+	if cgroup.Resources.Memory != 0 && cgroup.Resources.MemorySwap > 0 {
+		memoryUsage, err := getMemoryData(path, "")
+		if err != nil {
+			return err
+		}
+
+		// When update memory limit, we should adapt the write sequence
+		// for memory and swap memory, so it won't fail because the new
+		// value and the old value don't fit kernel's validation.
+		if memoryUsage.Limit < uint64(cgroup.Resources.MemorySwap) {
+			if err := writeFile(path, "memory.memsw.limit_in_bytes", strconv.FormatInt(cgroup.Resources.MemorySwap, 10)); err != nil {
+				return err
+			}
+			if err := writeFile(path, "memory.limit_in_bytes", strconv.FormatInt(cgroup.Resources.Memory, 10)); err != nil {
+				return err
+			}
+		} else {
+			if err := writeFile(path, "memory.limit_in_bytes", strconv.FormatInt(cgroup.Resources.Memory, 10)); err != nil {
+				return err
+			}
+			if err := writeFile(path, "memory.memsw.limit_in_bytes", strconv.FormatInt(cgroup.Resources.MemorySwap, 10)); err != nil {
+				return err
+			}
+		}
+	} else {
+		if cgroup.Resources.Memory != 0 {
+			if err := writeFile(path, "memory.limit_in_bytes", strconv.FormatInt(cgroup.Resources.Memory, 10)); err != nil {
+				return err
+			}
+		}
+		if cgroup.Resources.MemorySwap > 0 {
+			if err := writeFile(path, "memory.memsw.limit_in_bytes", strconv.FormatInt(cgroup.Resources.MemorySwap, 10)); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (s *MemoryGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if err := setMemoryAndSwap(path, cgroup); err != nil {
+		return err
+	}
+
+	if cgroup.Resources.KernelMemory != 0 {
+		if err := setKernelMemory(path, cgroup.Resources.KernelMemory); err != nil {
+			return err
+		}
+	}
+
+	if cgroup.Resources.MemoryReservation != 0 {
+		if err := writeFile(path, "memory.soft_limit_in_bytes", strconv.FormatInt(cgroup.Resources.MemoryReservation, 10)); err != nil {
+			return err
+		}
+	}
+
+	if cgroup.Resources.KernelMemoryTCP != 0 {
+		if err := writeFile(path, "memory.kmem.tcp.limit_in_bytes", strconv.FormatInt(cgroup.Resources.KernelMemoryTCP, 10)); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.OomKillDisable {
+		if err := writeFile(path, "memory.oom_control", "1"); err != nil {
+			return err
+		}
+	}
+	if cgroup.Resources.MemorySwappiness == nil || int64(*cgroup.Resources.MemorySwappiness) == -1 {
+		return nil
+	} else if int64(*cgroup.Resources.MemorySwappiness) >= 0 && int64(*cgroup.Resources.MemorySwappiness) <= 100 {
+		if err := writeFile(path, "memory.swappiness", strconv.FormatInt(*cgroup.Resources.MemorySwappiness, 10)); err != nil {
+			return err
+		}
+	} else {
+		return fmt.Errorf("invalid value:%d. valid memory swappiness range is 0-100", int64(*cgroup.Resources.MemorySwappiness))
+	}
+
+	return nil
+}
+
+func (s *MemoryGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("memory"))
+}
+
+func (s *MemoryGroup) GetStats(path string, stats *cgroups.Stats) error {
+	// Set stats from memory.stat.
+	statsFile, err := os.Open(filepath.Join(path, "memory.stat"))
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+	defer statsFile.Close()
+
+	sc := bufio.NewScanner(statsFile)
+	for sc.Scan() {
+		t, v, err := getCgroupParamKeyValue(sc.Text())
+		if err != nil {
+			return fmt.Errorf("failed to parse memory.stat (%q) - %v", sc.Text(), err)
+		}
+		stats.MemoryStats.Stats[t] = v
+	}
+	stats.MemoryStats.Cache = stats.MemoryStats.Stats["cache"]
+
+	memoryUsage, err := getMemoryData(path, "")
+	if err != nil {
+		return err
+	}
+	stats.MemoryStats.Usage = memoryUsage
+	swapUsage, err := getMemoryData(path, "memsw")
+	if err != nil {
+		return err
+	}
+	stats.MemoryStats.SwapUsage = swapUsage
+	kernelUsage, err := getMemoryData(path, "kmem")
+	if err != nil {
+		return err
+	}
+	stats.MemoryStats.KernelUsage = kernelUsage
+	kernelTCPUsage, err := getMemoryData(path, "kmem.tcp")
+	if err != nil {
+		return err
+	}
+	stats.MemoryStats.KernelTCPUsage = kernelTCPUsage
+
+	return nil
+}
+
+func memoryAssigned(cgroup *configs.Cgroup) bool {
+	return cgroup.Resources.Memory != 0 ||
+		cgroup.Resources.MemoryReservation != 0 ||
+		cgroup.Resources.MemorySwap > 0 ||
+		cgroup.Resources.KernelMemory > 0 ||
+		cgroup.Resources.KernelMemoryTCP > 0 ||
+		cgroup.Resources.OomKillDisable ||
+		(cgroup.Resources.MemorySwappiness != nil && *cgroup.Resources.MemorySwappiness != -1)
+}
+
+func getMemoryData(path, name string) (cgroups.MemoryData, error) {
+	memoryData := cgroups.MemoryData{}
+
+	moduleName := "memory"
+	if name != "" {
+		moduleName = strings.Join([]string{"memory", name}, ".")
+	}
+	usage := strings.Join([]string{moduleName, "usage_in_bytes"}, ".")
+	maxUsage := strings.Join([]string{moduleName, "max_usage_in_bytes"}, ".")
+	failcnt := strings.Join([]string{moduleName, "failcnt"}, ".")
+	limit := strings.Join([]string{moduleName, "limit_in_bytes"}, ".")
+
+	value, err := getCgroupParamUint(path, usage)
+	if err != nil {
+		if moduleName != "memory" && os.IsNotExist(err) {
+			return cgroups.MemoryData{}, nil
+		}
+		return cgroups.MemoryData{}, fmt.Errorf("failed to parse %s - %v", usage, err)
+	}
+	memoryData.Usage = value
+	value, err = getCgroupParamUint(path, maxUsage)
+	if err != nil {
+		if moduleName != "memory" && os.IsNotExist(err) {
+			return cgroups.MemoryData{}, nil
+		}
+		return cgroups.MemoryData{}, fmt.Errorf("failed to parse %s - %v", maxUsage, err)
+	}
+	memoryData.MaxUsage = value
+	value, err = getCgroupParamUint(path, failcnt)
+	if err != nil {
+		if moduleName != "memory" && os.IsNotExist(err) {
+			return cgroups.MemoryData{}, nil
+		}
+		return cgroups.MemoryData{}, fmt.Errorf("failed to parse %s - %v", failcnt, err)
+	}
+	memoryData.Failcnt = value
+	value, err = getCgroupParamUint(path, limit)
+	if err != nil {
+		if moduleName != "memory" && os.IsNotExist(err) {
+			return cgroups.MemoryData{}, nil
+		}
+		return cgroups.MemoryData{}, fmt.Errorf("failed to parse %s - %v", limit, err)
+	}
+	memoryData.Limit = value
+
+	return memoryData, nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/name.go

@@ -0,0 +1,40 @@
+// +build linux
+
+package fs
+
+import (
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type NameGroup struct {
+	GroupName string
+	Join      bool
+}
+
+func (s *NameGroup) Name() string {
+	return s.GroupName
+}
+
+func (s *NameGroup) Apply(d *cgroupData) error {
+	if s.Join {
+		// ignore errors if the named cgroup does not exist
+		d.join(s.GroupName)
+	}
+	return nil
+}
+
+func (s *NameGroup) Set(path string, cgroup *configs.Cgroup) error {
+	return nil
+}
+
+func (s *NameGroup) Remove(d *cgroupData) error {
+	if s.Join {
+		removePath(d.path(s.GroupName))
+	}
+	return nil
+}
+
+func (s *NameGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/net_cls.go

@@ -0,0 +1,43 @@
+// +build linux
+
+package fs
+
+import (
+	"strconv"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type NetClsGroup struct {
+}
+
+func (s *NetClsGroup) Name() string {
+	return "net_cls"
+}
+
+func (s *NetClsGroup) Apply(d *cgroupData) error {
+	_, err := d.join("net_cls")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *NetClsGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if cgroup.Resources.NetClsClassid != 0 {
+		if err := writeFile(path, "net_cls.classid", strconv.FormatUint(uint64(cgroup.Resources.NetClsClassid), 10)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *NetClsGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("net_cls"))
+}
+
+func (s *NetClsGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/net_prio.go

@@ -0,0 +1,41 @@
+// +build linux
+
+package fs
+
+import (
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type NetPrioGroup struct {
+}
+
+func (s *NetPrioGroup) Name() string {
+	return "net_prio"
+}
+
+func (s *NetPrioGroup) Apply(d *cgroupData) error {
+	_, err := d.join("net_prio")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *NetPrioGroup) Set(path string, cgroup *configs.Cgroup) error {
+	for _, prioMap := range cgroup.Resources.NetPrioIfpriomap {
+		if err := writeFile(path, "net_prio.ifpriomap", prioMap.CgroupString()); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *NetPrioGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("net_prio"))
+}
+
+func (s *NetPrioGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/perf_event.go

@@ -0,0 +1,35 @@
+// +build linux
+
+package fs
+
+import (
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type PerfEventGroup struct {
+}
+
+func (s *PerfEventGroup) Name() string {
+	return "perf_event"
+}
+
+func (s *PerfEventGroup) Apply(d *cgroupData) error {
+	// we just want to join this group even though we don't set anything
+	if _, err := d.join("perf_event"); err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *PerfEventGroup) Set(path string, cgroup *configs.Cgroup) error {
+	return nil
+}
+
+func (s *PerfEventGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("perf_event"))
+}
+
+func (s *PerfEventGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/pids.go

@@ -0,0 +1,73 @@
+// +build linux
+
+package fs
+
+import (
+	"fmt"
+	"path/filepath"
+	"strconv"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type PidsGroup struct {
+}
+
+func (s *PidsGroup) Name() string {
+	return "pids"
+}
+
+func (s *PidsGroup) Apply(d *cgroupData) error {
+	_, err := d.join("pids")
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+	return nil
+}
+
+func (s *PidsGroup) Set(path string, cgroup *configs.Cgroup) error {
+	if cgroup.Resources.PidsLimit != 0 {
+		// "max" is the fallback value.
+		limit := "max"
+
+		if cgroup.Resources.PidsLimit > 0 {
+			limit = strconv.FormatInt(cgroup.Resources.PidsLimit, 10)
+		}
+
+		if err := writeFile(path, "pids.max", limit); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *PidsGroup) Remove(d *cgroupData) error {
+	return removePath(d.path("pids"))
+}
+
+func (s *PidsGroup) GetStats(path string, stats *cgroups.Stats) error {
+	current, err := getCgroupParamUint(path, "pids.current")
+	if err != nil {
+		return fmt.Errorf("failed to parse pids.current - %s", err)
+	}
+
+	maxString, err := getCgroupParamString(path, "pids.max")
+	if err != nil {
+		return fmt.Errorf("failed to parse pids.max - %s", err)
+	}
+
+	// Default if pids.max == "max" is 0 -- which represents "no limit".
+	var max uint64
+	if maxString != "max" {
+		max, err = parseUint(maxString, 10, 64)
+		if err != nil {
+			return fmt.Errorf("failed to parse pids.max - unable to parse %q as a uint from Cgroup file %q", maxString, filepath.Join(path, "pids.max"))
+		}
+	}
+
+	stats.PidsStats.Current = current
+	stats.PidsStats.Limit = max
+	return nil
+}

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/utils.go

@@ -0,0 +1,78 @@
+// +build linux
+
+package fs
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+var (
+	ErrNotValidFormat = errors.New("line is not a valid key value format")
+)
+
+// Saturates negative values at zero and returns a uint64.
+// Due to kernel bugs, some of the memory cgroup stats can be negative.
+func parseUint(s string, base, bitSize int) (uint64, error) {
+	value, err := strconv.ParseUint(s, base, bitSize)
+	if err != nil {
+		intValue, intErr := strconv.ParseInt(s, base, bitSize)
+		// 1. Handle negative values greater than MinInt64 (and)
+		// 2. Handle negative values lesser than MinInt64
+		if intErr == nil && intValue < 0 {
+			return 0, nil
+		} else if intErr != nil && intErr.(*strconv.NumError).Err == strconv.ErrRange && intValue < 0 {
+			return 0, nil
+		}
+
+		return value, err
+	}
+
+	return value, nil
+}
+
+// Parses a cgroup param and returns as name, value
+//  i.e. "io_service_bytes 1234" will return as io_service_bytes, 1234
+func getCgroupParamKeyValue(t string) (string, uint64, error) {
+	parts := strings.Fields(t)
+	switch len(parts) {
+	case 2:
+		value, err := parseUint(parts[1], 10, 64)
+		if err != nil {
+			return "", 0, fmt.Errorf("unable to convert param value (%q) to uint64: %v", parts[1], err)
+		}
+
+		return parts[0], value, nil
+	default:
+		return "", 0, ErrNotValidFormat
+	}
+}
+
+// Gets a single uint64 value from the specified cgroup file.
+func getCgroupParamUint(cgroupPath, cgroupFile string) (uint64, error) {
+	fileName := filepath.Join(cgroupPath, cgroupFile)
+	contents, err := ioutil.ReadFile(fileName)
+	if err != nil {
+		return 0, err
+	}
+
+	res, err := parseUint(strings.TrimSpace(string(contents)), 10, 64)
+	if err != nil {
+		return res, fmt.Errorf("unable to parse %q as a uint from Cgroup file %q", string(contents), fileName)
+	}
+	return res, nil
+}
+
+// Gets a string value from the specified cgroup file
+func getCgroupParamString(cgroupPath, cgroupFile string) (string, error) {
+	contents, err := ioutil.ReadFile(filepath.Join(cgroupPath, cgroupFile))
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(string(contents)), nil
+}