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// Copyright 2015 Daniel Theophanes.
// Use of this source code is governed by a zlib-style
// license that can be found in the LICENSE file.
package service
import (
"bufio"
"errors"
"fmt"
"io/ioutil"
"os"
"strings"
)
var cgroupFile = "/proc/1/cgroup"
var mountInfoFile = "/proc/self/mountinfo"
var dockerEnvFile = "/.dockerenv"
type linuxSystemService struct {
name string
detect func() bool
interactive func() bool
new func(i Interface, platform string, c *Config) (Service, error)
}
func (sc linuxSystemService) String() string {
return sc.name
}
func (sc linuxSystemService) Detect() bool {
return sc.detect()
}
func (sc linuxSystemService) Interactive() bool {
return sc.interactive()
}
func (sc linuxSystemService) New(i Interface, c *Config) (Service, error) {
return sc.new(i, sc.String(), c)
}
func init() {
ChooseSystem(linuxSystemService{
name: "linux-systemd",
detect: isSystemd,
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newSystemdService,
},
linuxSystemService{
name: "linux-upstart",
detect: isUpstart,
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newUpstartService,
},
linuxSystemService{
name: "linux-openrc",
detect: isOpenRC,
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newOpenRCService,
},
linuxSystemService{
name: "linux-rcs",
detect: isRCS,
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newRCSService,
},
linuxSystemService{
name: "linux-procd",
detect: isProcd,
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newProcdService,
},
linuxSystemService{
name: "unix-systemv",
detect: func() bool { return true },
interactive: func() bool {
is, _ := isInteractive()
return is
},
new: newSystemVService,
},
)
}
func binaryName(pid int) (string, error) {
statPath := fmt.Sprintf("/proc/%d/stat", pid)
dataBytes, err := ioutil.ReadFile(statPath)
if err != nil {
return "", err
}
// First, parse out the image name
data := string(dataBytes)
binStart := strings.IndexRune(data, '(') + 1
binEnd := strings.IndexRune(data[binStart:], ')')
return data[binStart : binStart+binEnd], nil
}
func isInteractive() (bool, error) {
inContainer, err := isInContainer()
if err != nil {
return false, err
}
if inContainer {
return true, nil
}
ppid := os.Getppid()
if ppid == 1 {
return false, nil
}
binary, _ := binaryName(ppid)
return binary != "systemd", nil
}
// isInContainer checks if the service is being executed in docker or lxc
// container.
func isInContainer() (bool, error) {
inContainer, err := isInContainerDockerEnv(dockerEnvFile)
if err != nil {
return false, err
}
if inContainer {
return true, nil
}
inContainer, err = isInContainerCGroup(cgroupFile)
if err != nil {
return false, err
}
if inContainer {
return true, nil
}
return isInContainerMountInfo(mountInfoFile)
}
func isInContainerDockerEnv(filePath string) (bool, error) {
_, err := os.Stat(filePath)
if err == nil {
return true, nil
}
if errors.Is(err, os.ErrNotExist) {
return false, nil
}
return false, err
}
func isInContainerMountInfo(filePath string) (bool, error) {
const maxlines = 15 // maximum lines to scan
f, err := os.Open(filePath)
if err != nil {
return false, err
}
defer f.Close()
scan := bufio.NewScanner(f)
lines := 0
for scan.Scan() && !(lines > maxlines) {
if strings.Contains(scan.Text(), "/docker/containers") {
return true, nil
}
lines++
}
if err := scan.Err(); err != nil {
return false, err
}
return false, nil
}
func isInContainerCGroup(cgroupPath string) (bool, error) {
const maxlines = 5 // maximum lines to scan
f, err := os.Open(cgroupPath)
if err != nil {
return false, err
}
defer f.Close()
scan := bufio.NewScanner(f)
lines := 0
for scan.Scan() && !(lines > maxlines) {
if strings.Contains(scan.Text(), "docker") || strings.Contains(scan.Text(), "lxc") {
return true, nil
}
lines++
}
if err := scan.Err(); err != nil {
return false, err
}
return false, nil
}
var tf = map[string]interface{}{
"cmd": func(s string) string {
return `"` + strings.Replace(s, `"`, `\"`, -1) + `"`
},
"cmdEscape": func(s string) string {
return strings.Replace(s, " ", `\x20`, -1)
},
}
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