vendor: cadvisor v0.39.0

Main upgrades:
- github.com/opencontainers/runc v1.0.0-rc93
- github.com/containerd/containerd v1.4.4
- github.com/docker/docker v20.10.2
- github.com/mrunalp/fileutils v0.5.0
- github.com/opencontainers/selinux v1.8.0
- github.com/cilium/ebpf v0.2.0

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs2/hugetlb.go

@@ -3,10 +3,7 @@
 package fs2
 
 import (
-	"io/ioutil"
-	"path/filepath"
 	"strconv"
-	"strings"
 
 	"github.com/pkg/errors"
 
@@ -24,7 +21,7 @@ func setHugeTlb(dirPath string, cgroup *configs.Cgroup) error {
 		return nil
 	}
 	for _, hugetlb := range cgroup.Resources.HugetlbLimit {
-		if err := fscommon.WriteFile(dirPath, strings.Join([]string{"hugetlb", hugetlb.Pagesize, "max"}, "."), strconv.FormatUint(hugetlb.Limit, 10)); err != nil {
+		if err := fscommon.WriteFile(dirPath, "hugetlb."+hugetlb.Pagesize+".max", strconv.FormatUint(hugetlb.Limit, 10)); err != nil {
 			return err
 		}
 	}
@@ -40,22 +37,20 @@ func statHugeTlb(dirPath string, stats *cgroups.Stats) error {
 	hugetlbStats := cgroups.HugetlbStats{}
 
 	for _, pagesize := range hugePageSizes {
-		usage := strings.Join([]string{"hugetlb", pagesize, "current"}, ".")
-		value, err := fscommon.GetCgroupParamUint(dirPath, usage)
+		value, err := fscommon.GetCgroupParamUint(dirPath, "hugetlb."+pagesize+".current")
 		if err != nil {
-			return errors.Wrapf(err, "failed to parse hugetlb.%s.current file", pagesize)
+			return err
 		}
 		hugetlbStats.Usage = value
 
-		fileName := strings.Join([]string{"hugetlb", pagesize, "events"}, ".")
-		filePath := filepath.Join(dirPath, fileName)
-		contents, err := ioutil.ReadFile(filePath)
+		fileName := "hugetlb." + pagesize + ".events"
+		contents, err := fscommon.ReadFile(dirPath, fileName)
 		if err != nil {
-			return errors.Wrapf(err, "failed to parse hugetlb.%s.events file", pagesize)
+			return errors.Wrap(err, "failed to read stats")
 		}
-		_, value, err = fscommon.GetCgroupParamKeyValue(string(contents))
+		_, value, err = fscommon.GetCgroupParamKeyValue(contents)
 		if err != nil {
-			return errors.Wrapf(err, "failed to parse hugetlb.%s.events file", pagesize)
+			return errors.Wrap(err, "failed to parse "+fileName)
 		}
 		hugetlbStats.Failcnt = value