1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// Package operatingsystem provides helper function to get the operating system
// name for different platforms.
package operatingsystem
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/mattn/go-shellwords"
)
var (
// file to use to detect if the daemon is running in a container
proc1Cgroup = "/proc/1/cgroup"
// file to check to determine Operating System
etcOsRelease = "/etc/os-release"
// used by stateless systems like Clear Linux
altOsRelease = "/usr/lib/os-release"
)
// GetOperatingSystem gets the name of the current operating system.
func GetOperatingSystem() (string, error) {
osReleaseFile, err := os.Open(etcOsRelease)
if err != nil {
if !os.IsNotExist(err) {
return "", fmt.Errorf("Error opening %s: %v", etcOsRelease, err)
}
osReleaseFile, err = os.Open(altOsRelease)
if err != nil {
return "", fmt.Errorf("Error opening %s: %v", altOsRelease, err)
}
}
defer osReleaseFile.Close()
var prettyName string
scanner := bufio.NewScanner(osReleaseFile)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "PRETTY_NAME=") {
data := strings.SplitN(line, "=", 2)
prettyNames, err := shellwords.Parse(data[1])
if err != nil {
return "", fmt.Errorf("PRETTY_NAME is invalid: %s", err.Error())
}
if len(prettyNames) != 1 {
return "", fmt.Errorf("PRETTY_NAME needs to be enclosed by quotes if they have spaces: %s", data[1])
}
prettyName = prettyNames[0]
}
}
if prettyName != "" {
return prettyName, nil
}
// If not set, defaults to PRETTY_NAME="Linux"
// c.f. http://www.freedesktop.org/software/systemd/man/os-release.html
return "Linux", nil
}
// IsContainerized returns true if we are running inside a container.
func IsContainerized() (bool, error) {
b, err := ioutil.ReadFile(proc1Cgroup)
if err != nil {
return false, err
}
for _, line := range bytes.Split(b, []byte{'\n'}) {
if len(line) > 0 && !bytes.HasSuffix(line, []byte{'/'}) && !bytes.HasSuffix(line, []byte("init.scope")) {
return true, nil
}
}
return false, nil
}
|
