github.com/google/cadvisor@v0.49.1/machine/operatingsystem_unix.go (about)

     1  // Copyright 2020 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build freebsd || darwin || linux
    16  // +build freebsd darwin linux
    17  
    18  package machine
    19  
    20  import (
    21  	"fmt"
    22  	"os"
    23  	"os/exec"
    24  	"regexp"
    25  	"runtime"
    26  	"strings"
    27  )
    28  
    29  var rex = regexp.MustCompile("(PRETTY_NAME)=(.*)")
    30  
    31  // getOperatingSystem gets the name of the current operating system.
    32  func getOperatingSystem() (string, error) {
    33  	if runtime.GOOS == "darwin" || runtime.GOOS == "freebsd" {
    34  		cmd := exec.Command("uname", "-s")
    35  		osName, err := cmd.Output()
    36  		if err != nil {
    37  			return "", err
    38  		}
    39  		return string(osName), nil
    40  	}
    41  	bytes, err := os.ReadFile("/etc/os-release")
    42  	if err != nil && os.IsNotExist(err) {
    43  		// /usr/lib/os-release in stateless systems like Clear Linux
    44  		bytes, err = os.ReadFile("/usr/lib/os-release")
    45  	}
    46  	if err != nil {
    47  		return "", fmt.Errorf("error opening file : %v", err)
    48  	}
    49  	line := rex.FindAllStringSubmatch(string(bytes), -1)
    50  	if len(line) > 0 {
    51  		return strings.Trim(line[0][2], "\""), nil
    52  	}
    53  	return "Linux", nil
    54  }