update vendor to use containerd cgroups

vendor/github.com/containerd/cgroups/subsystem.go

@@ -0,0 +1,116 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package cgroups
+
+import (
+	"fmt"
+	"os"
+
+	v1 "github.com/containerd/cgroups/stats/v1"
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// Name is a typed name for a cgroup subsystem
+type Name string
+
+const (
+	Devices   Name = "devices"
+	Hugetlb   Name = "hugetlb"
+	Freezer   Name = "freezer"
+	Pids      Name = "pids"
+	NetCLS    Name = "net_cls"
+	NetPrio   Name = "net_prio"
+	PerfEvent Name = "perf_event"
+	Cpuset    Name = "cpuset"
+	Cpu       Name = "cpu"
+	Cpuacct   Name = "cpuacct"
+	Memory    Name = "memory"
+	Blkio     Name = "blkio"
+	Rdma      Name = "rdma"
+)
+
+// Subsystems returns a complete list of the default cgroups
+// available on most linux systems
+func Subsystems() []Name {
+	n := []Name{
+		Freezer,
+		Pids,
+		NetCLS,
+		NetPrio,
+		PerfEvent,
+		Cpuset,
+		Cpu,
+		Cpuacct,
+		Memory,
+		Blkio,
+		Rdma,
+	}
+	if !RunningInUserNS() {
+		n = append(n, Devices)
+	}
+	if _, err := os.Stat("/sys/kernel/mm/hugepages"); err == nil {
+		n = append(n, Hugetlb)
+	}
+	return n
+}
+
+type Subsystem interface {
+	Name() Name
+}
+
+type pather interface {
+	Subsystem
+	Path(path string) string
+}
+
+type creator interface {
+	Subsystem
+	Create(path string, resources *specs.LinuxResources) error
+}
+
+type deleter interface {
+	Subsystem
+	Delete(path string) error
+}
+
+type stater interface {
+	Subsystem
+	Stat(path string, stats *v1.Metrics) error
+}
+
+type updater interface {
+	Subsystem
+	Update(path string, resources *specs.LinuxResources) error
+}
+
+// SingleSubsystem returns a single cgroup subsystem within the base Hierarchy
+func SingleSubsystem(baseHierarchy Hierarchy, subsystem Name) Hierarchy {
+	return func() ([]Subsystem, error) {
+		subsystems, err := baseHierarchy()
+		if err != nil {
+			return nil, err
+		}
+		for _, s := range subsystems {
+			if s.Name() == subsystem {
+				return []Subsystem{
+					s,
+				}, nil
+			}
+		}
+		return nil, fmt.Errorf("unable to find subsystem %s", subsystem)
+	}
+}