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// Package operatingsystem provides helper function to get the operating system
// name for different platforms.
package operatingsystem // import "github.com/docker/docker/pkg/parsers/operatingsystem"
import (
"bufio"
"bytes"
"os"
"strings"
)
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) {
if prettyName, err := getValueFromOsRelease("PRETTY_NAME"); err != nil {
return "", err
} else 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
}
// GetOperatingSystemVersion gets the version of the current operating system, as a string.
func GetOperatingSystemVersion() (string, error) {
return getValueFromOsRelease("VERSION_ID")
}
// parses the os-release file and returns the value associated with `key`
func getValueFromOsRelease(key string) (string, error) {
osReleaseFile, err := os.Open(etcOsRelease)
if err != nil {
if !os.IsNotExist(err) {
return "", err
}
osReleaseFile, err = os.Open(altOsRelease)
if err != nil {
return "", err
}
}
defer osReleaseFile.Close()
var value string
scanner := bufio.NewScanner(osReleaseFile)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, key+"=") {
value = strings.TrimPrefix(line, key+"=")
value = strings.Trim(value, `"' `) // remove leading/trailing quotes and whitespace
}
}
return value, nil
}
// IsContainerized returns true if we are running inside a container.
func IsContainerized() (bool, error) {
b, err := os.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
}
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