open-consul/vendor/github.com/shirou/gopsutil/host/host_linux.go

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// +build linux
package host
import (
"bytes"
"encoding/binary"
"fmt"
"io/ioutil"
"os"
"os/exec"
"regexp"
"runtime"
"strconv"
"strings"
"time"
"github.com/shirou/gopsutil/internal/common"
)
type LSB struct {
ID string
Release string
Codename string
Description string
}
// from utmp.h
const USER_PROCESS = 7
func Info() (*InfoStat, error) {
ret := &InfoStat{
OS: runtime.GOOS,
}
hostname, err := os.Hostname()
if err == nil {
ret.Hostname = hostname
}
platform, family, version, err := PlatformInformation()
if err == nil {
ret.Platform = platform
ret.PlatformFamily = family
ret.PlatformVersion = version
}
kernelVersion, err := KernelVersion()
if err == nil {
ret.KernelVersion = kernelVersion
}
system, role, err := Virtualization()
if err == nil {
ret.VirtualizationSystem = system
ret.VirtualizationRole = role
}
boot, err := BootTime()
if err == nil {
ret.BootTime = boot
ret.Uptime = uptime(boot)
}
if numProcs, err := common.NumProcs(); err == nil {
ret.Procs = numProcs
}
sysProductUUID := common.HostSys("class/dmi/id/product_uuid")
switch {
case common.PathExists(sysProductUUID):
lines, err := common.ReadLines(sysProductUUID)
if err == nil && len(lines) > 0 && lines[0] != "" {
ret.HostID = strings.ToLower(lines[0])
break
}
fallthrough
default:
values, err := common.DoSysctrl("kernel.random.boot_id")
if err == nil && len(values) == 1 && values[0] != "" {
ret.HostID = strings.ToLower(values[0])
}
}
return ret, nil
}
// BootTime returns the system boot time expressed in seconds since the epoch.
func BootTime() (uint64, error) {
if cachedBootTime != 0 {
return cachedBootTime, nil
}
filename := common.HostProc("stat")
lines, err := common.ReadLines(filename)
if err != nil {
return 0, err
}
for _, line := range lines {
if strings.HasPrefix(line, "btime") {
f := strings.Fields(line)
if len(f) != 2 {
return 0, fmt.Errorf("wrong btime format")
}
b, err := strconv.ParseInt(f[1], 10, 64)
if err != nil {
return 0, err
}
cachedBootTime = uint64(b)
return cachedBootTime, nil
}
}
return 0, fmt.Errorf("could not find btime")
}
func uptime(boot uint64) uint64 {
return uint64(time.Now().Unix()) - boot
}
func Uptime() (uint64, error) {
boot, err := BootTime()
if err != nil {
return 0, err
}
return uptime(boot), nil
}
func Users() ([]UserStat, error) {
utmpfile := "/var/run/utmp"
file, err := os.Open(utmpfile)
if err != nil {
return nil, err
}
buf, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
count := len(buf) / sizeOfUtmp
ret := make([]UserStat, 0, count)
for i := 0; i < count; i++ {
b := buf[i*sizeOfUtmp : (i+1)*sizeOfUtmp]
var u utmp
br := bytes.NewReader(b)
err := binary.Read(br, binary.LittleEndian, &u)
if err != nil {
continue
}
if u.Type != USER_PROCESS {
continue
}
user := UserStat{
User: common.IntToString(u.User[:]),
Terminal: common.IntToString(u.Line[:]),
Host: common.IntToString(u.Host[:]),
Started: int(u.Tv.Sec),
}
ret = append(ret, user)
}
return ret, nil
}
func getOSRelease() (platform string, version string, err error) {
contents, err := common.ReadLines(common.HostEtc("os-release"))
if err != nil {
return "", "", nil // return empty
}
for _, line := range contents {
field := strings.Split(line, "=")
if len(field) < 2 {
continue
}
switch field[0] {
case "ID": // use ID for lowercase
platform = field[1]
case "VERSION":
version = field[1]
}
}
return platform, version, nil
}
func getLSB() (*LSB, error) {
ret := &LSB{}
if common.PathExists(common.HostEtc("lsb-release")) {
contents, err := common.ReadLines(common.HostEtc("lsb-release"))
if err != nil {
return ret, err // return empty
}
for _, line := range contents {
field := strings.Split(line, "=")
if len(field) < 2 {
continue
}
switch field[0] {
case "DISTRIB_ID":
ret.ID = field[1]
case "DISTRIB_RELEASE":
ret.Release = field[1]
case "DISTRIB_CODENAME":
ret.Codename = field[1]
case "DISTRIB_DESCRIPTION":
ret.Description = field[1]
}
}
} else if common.PathExists("/usr/bin/lsb_release") {
lsb_release, err := exec.LookPath("/usr/bin/lsb_release")
if err != nil {
return ret, err
}
out, err := invoke.Command(lsb_release)
if err != nil {
return ret, err
}
for _, line := range strings.Split(string(out), "\n") {
field := strings.Split(line, ":")
if len(field) < 2 {
continue
}
switch field[0] {
case "Distributor ID":
ret.ID = field[1]
case "Release":
ret.Release = field[1]
case "Codename":
ret.Codename = field[1]
case "Description":
ret.Description = field[1]
}
}
}
return ret, nil
}
func PlatformInformation() (platform string, family string, version string, err error) {
lsb, err := getLSB()
if err != nil {
lsb = &LSB{}
}
if common.PathExists(common.HostEtc("oracle-release")) {
platform = "oracle"
contents, err := common.ReadLines(common.HostEtc("oracle-release"))
if err == nil {
version = getRedhatishVersion(contents)
}
} else if common.PathExists(common.HostEtc("enterprise-release")) {
platform = "oracle"
contents, err := common.ReadLines(common.HostEtc("enterprise-release"))
if err == nil {
version = getRedhatishVersion(contents)
}
} else if common.PathExists(common.HostEtc("debian_version")) {
if lsb.ID == "Ubuntu" {
platform = "ubuntu"
version = lsb.Release
} else if lsb.ID == "LinuxMint" {
platform = "linuxmint"
version = lsb.Release
} else {
if common.PathExists("/usr/bin/raspi-config") {
platform = "raspbian"
} else {
platform = "debian"
}
contents, err := common.ReadLines(common.HostEtc("debian_version"))
if err == nil {
version = contents[0]
}
}
} else if common.PathExists(common.HostEtc("redhat-release")) {
contents, err := common.ReadLines(common.HostEtc("redhat-release"))
if err == nil {
version = getRedhatishVersion(contents)
platform = getRedhatishPlatform(contents)
}
} else if common.PathExists(common.HostEtc("system-release")) {
contents, err := common.ReadLines(common.HostEtc("system-release"))
if err == nil {
version = getRedhatishVersion(contents)
platform = getRedhatishPlatform(contents)
}
} else if common.PathExists(common.HostEtc("gentoo-release")) {
platform = "gentoo"
contents, err := common.ReadLines(common.HostEtc("gentoo-release"))
if err == nil {
version = getRedhatishVersion(contents)
}
} else if common.PathExists(common.HostEtc("SuSE-release")) {
contents, err := common.ReadLines(common.HostEtc("SuSE-release"))
if err == nil {
version = getSuseVersion(contents)
platform = getSusePlatform(contents)
}
// TODO: slackware detecion
} else if common.PathExists(common.HostEtc("arch-release")) {
platform = "arch"
version = lsb.Release
} else if common.PathExists(common.HostEtc("alpine-release")) {
platform = "alpine"
contents, err := common.ReadLines(common.HostEtc("alpine-release"))
if err == nil && len(contents) > 0 {
version = contents[0]
}
} else if common.PathExists(common.HostEtc("os-release")) {
p, v, err := getOSRelease()
if err == nil {
platform = p
version = v
}
} else if lsb.ID == "RedHat" {
platform = "redhat"
version = lsb.Release
} else if lsb.ID == "Amazon" {
platform = "amazon"
version = lsb.Release
} else if lsb.ID == "ScientificSL" {
platform = "scientific"
version = lsb.Release
} else if lsb.ID == "XenServer" {
platform = "xenserver"
version = lsb.Release
} else if lsb.ID != "" {
platform = strings.ToLower(lsb.ID)
version = lsb.Release
}
switch platform {
case "debian", "ubuntu", "linuxmint", "raspbian":
family = "debian"
case "fedora":
family = "fedora"
case "oracle", "centos", "redhat", "scientific", "enterpriseenterprise", "amazon", "xenserver", "cloudlinux", "ibm_powerkvm":
family = "rhel"
case "suse", "opensuse":
family = "suse"
case "gentoo":
family = "gentoo"
case "slackware":
family = "slackware"
case "arch":
family = "arch"
case "exherbo":
family = "exherbo"
case "alpine":
family = "alpine"
case "coreos":
family = "coreos"
}
return platform, family, version, nil
}
func KernelVersion() (version string, err error) {
filename := common.HostProc("sys/kernel/osrelease")
if common.PathExists(filename) {
contents, err := common.ReadLines(filename)
if err != nil {
return "", err
}
if len(contents) > 0 {
version = contents[0]
}
}
return version, nil
}
func getRedhatishVersion(contents []string) string {
c := strings.ToLower(strings.Join(contents, ""))
if strings.Contains(c, "rawhide") {
return "rawhide"
}
if matches := regexp.MustCompile(`release (\d[\d.]*)`).FindStringSubmatch(c); matches != nil {
return matches[1]
}
return ""
}
func getRedhatishPlatform(contents []string) string {
c := strings.ToLower(strings.Join(contents, ""))
if strings.Contains(c, "red hat") {
return "redhat"
}
f := strings.Split(c, " ")
return f[0]
}
func getSuseVersion(contents []string) string {
version := ""
for _, line := range contents {
if matches := regexp.MustCompile(`VERSION = ([\d.]+)`).FindStringSubmatch(line); matches != nil {
version = matches[1]
} else if matches := regexp.MustCompile(`PATCHLEVEL = ([\d]+)`).FindStringSubmatch(line); matches != nil {
version = version + "." + matches[1]
}
}
return version
}
func getSusePlatform(contents []string) string {
c := strings.ToLower(strings.Join(contents, ""))
if strings.Contains(c, "opensuse") {
return "opensuse"
}
return "suse"
}
func Virtualization() (string, string, error) {
var system string
var role string
filename := common.HostProc("xen")
if common.PathExists(filename) {
system = "xen"
role = "guest" // assume guest
if common.PathExists(filename + "/capabilities") {
contents, err := common.ReadLines(filename + "/capabilities")
if err == nil {
if common.StringsContains(contents, "control_d") {
role = "host"
}
}
}
}
filename = common.HostProc("modules")
if common.PathExists(filename) {
contents, err := common.ReadLines(filename)
if err == nil {
if common.StringsContains(contents, "kvm") {
system = "kvm"
role = "host"
} else if common.StringsContains(contents, "vboxdrv") {
system = "vbox"
role = "host"
} else if common.StringsContains(contents, "vboxguest") {
system = "vbox"
role = "guest"
}
}
}
filename = common.HostProc("cpuinfo")
if common.PathExists(filename) {
contents, err := common.ReadLines(filename)
if err == nil {
if common.StringsContains(contents, "QEMU Virtual CPU") ||
common.StringsContains(contents, "Common KVM processor") ||
common.StringsContains(contents, "Common 32-bit KVM processor") {
system = "kvm"
role = "guest"
}
}
}
filename = common.HostProc()
if common.PathExists(filename + "/bc/0") {
system = "openvz"
role = "host"
} else if common.PathExists(filename + "/vz") {
system = "openvz"
role = "guest"
}
// not use dmidecode because it requires root
if common.PathExists(filename + "/self/status") {
contents, err := common.ReadLines(filename + "/self/status")
if err == nil {
if common.StringsContains(contents, "s_context:") ||
common.StringsContains(contents, "VxID:") {
system = "linux-vserver"
}
// TODO: guest or host
}
}
if common.PathExists(filename + "/self/cgroup") {
contents, err := common.ReadLines(filename + "/self/cgroup")
if err == nil {
if common.StringsContains(contents, "lxc") {
system = "lxc"
role = "guest"
} else if common.StringsContains(contents, "docker") {
system = "docker"
role = "guest"
} else if common.StringsContains(contents, "machine-rkt") {
system = "rkt"
role = "guest"
} else if common.PathExists("/usr/bin/lxc-version") {
system = "lxc"
role = "host"
}
}
}
if common.PathExists(common.HostEtc("os-release")) {
p, _, err := getOSRelease()
if err == nil && p == "coreos" {
system = "rkt" // Is it true?
role = "host"
}
}
return system, role, nil
}