github.com/wlan0/docker@v1.5.0/pkg/parsers/operatingsystem/operatingsystem.go (about)

     1  package operatingsystem
     2  
     3  import (
     4  	"bytes"
     5  	"errors"
     6  	"io/ioutil"
     7  )
     8  
     9  var (
    10  	// file to use to detect if the daemon is running in a container
    11  	proc1Cgroup = "/proc/1/cgroup"
    12  
    13  	// file to check to determine Operating System
    14  	etcOsRelease = "/etc/os-release"
    15  )
    16  
    17  func GetOperatingSystem() (string, error) {
    18  	b, err := ioutil.ReadFile(etcOsRelease)
    19  	if err != nil {
    20  		return "", err
    21  	}
    22  	if i := bytes.Index(b, []byte("PRETTY_NAME")); i >= 0 {
    23  		b = b[i+13:]
    24  		return string(b[:bytes.IndexByte(b, '"')]), nil
    25  	}
    26  	return "", errors.New("PRETTY_NAME not found")
    27  }
    28  
    29  func IsContainerized() (bool, error) {
    30  	b, err := ioutil.ReadFile(proc1Cgroup)
    31  	if err != nil {
    32  		return false, err
    33  	}
    34  	for _, line := range bytes.Split(b, []byte{'\n'}) {
    35  		if len(line) > 0 && !bytes.HasSuffix(line, []byte{'/'}) {
    36  			return true, nil
    37  		}
    38  	}
    39  	return false, nil
    40  }