Update cadvisor and containerd

vendor/github.com/google/cadvisor/machine/operatingsystem_unix.go

@@ -0,0 +1,55 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// +build freebsd darwin linux
+
+package machine
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"strings"
+)
+
+var rex = regexp.MustCompile("(PRETTY_NAME)=(.*)")
+
+// getOperatingSystem gets the name of the current operating system.
+func getOperatingSystem() (string, error) {
+	if runtime.GOOS == "darwin" || runtime.GOOS == "freebsd" {
+		cmd := exec.Command("uname", "-s")
+		osName, err := cmd.Output()
+		if err != nil {
+			return "", err
+		}
+		return string(osName), nil
+	} else {
+		bytes, err := ioutil.ReadFile("/etc/os-release")
+		if err != nil && os.IsNotExist(err) {
+			// /usr/lib/os-release in stateless systems like Clear Linux
+			bytes, err = ioutil.ReadFile("/usr/lib/os-release")
+		}
+		if err != nil {
+			return "", fmt.Errorf("error opening file : %v", err)
+		}
+		line := rex.FindAllStringSubmatch(string(bytes), -1)
+		if len(line) > 0 {
+			return strings.Trim(line[0][2], "\""), nil
+		}
+		return "Linux", nil
+	}
+}