/
config.go
274 lines (215 loc) · 5.05 KB
/
config.go
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package upstart
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
var InitDir = "/etc/init"
type Script string
func (s Script) Indented() string {
return " " + strings.Join(strings.Split(string(s), "\n"), "\n ")
}
type Code struct {
Exec string
Script Script
}
func (c Code) Set() bool {
return c.Exec != "" || c.Script != ""
}
func (c Code) Output(name string) string {
if c.Exec != "" {
return fmt.Sprintf("%s exec %s\n", name, c.Exec)
}
if c.Script != "" {
return fmt.Sprintf("%s script\n%s\nend script\n", name, c.Script.Indented())
}
return ""
}
type Config struct {
Name string
Type string
Console string
Directory string
Description string
Emits []string
Env map[string]string
Exec string
Expect string
Instance string
KillSignal []string
KillTimeout int
Limit []string
Manual bool
Nice int
OomScore int
PostStart Code
PostStop Code
PreStart Code
PreStop Code
ReloadSignal string
Respawn bool
Script Script
SetGid string
SetUid string
StartOn string
StopOn string
Umask int
Usage string
Version string
}
func NewConfig() *Config {
return &Config{
Nice: -1,
OomScore: -1000,
Umask: -1,
Env: make(map[string]string),
}
}
func DaemonConfig(name string, cmd string) *Config {
cfg := &Config{
Nice: -1,
OomScore: -1000,
Umask: -1,
Env: make(map[string]string),
Name: name,
Type: "daemon",
Console: "log",
Description: fmt.Sprintf("%s service", name),
Exec: cmd,
Expect: "daemon",
Respawn: true,
StartOn: "runlevel [2345]",
StopOn: "runlevel [!2345]",
}
return cfg
}
func TaskConfig(name string, cmd string) *Config {
cfg := &Config{
Nice: -1,
OomScore: -1000,
Umask: -1,
Env: make(map[string]string),
Name: name,
Type: "task",
Console: "log",
Description: fmt.Sprintf("%s task", name),
Exec: cmd,
StartOn: "runlevel [2345]",
StopOn: "runlevel [!2345]",
}
return cfg
}
func (c *Config) UpdateDefaults() {
if c.Description == "" {
c.Description = fmt.Sprintf("%s %s", c.Name, c.Type)
}
}
func (c *Config) Foreground() {
c.Expect = ""
}
func (c *Config) Generate() []byte {
var buf bytes.Buffer
c.UpdateDefaults()
buf.WriteString(fmt.Sprintf("# %s %s\n\n", c.Name, c.Type))
buf.WriteString(fmt.Sprintf("description \"%s\"\n", c.Description))
if c.Usage != "" {
buf.WriteString(fmt.Sprintf("usage \"%s\"\n", c.Usage))
}
if c.Version != "" {
buf.WriteString(fmt.Sprintf("version \"%s\"\n", c.Version))
}
buf.WriteString(fmt.Sprintf("start on %s\n", c.StartOn))
buf.WriteString(fmt.Sprintf("stop on %s\n", c.StopOn))
if c.Type == "task" {
buf.WriteString("task\n")
}
for _, e := range c.Emits {
buf.WriteString(fmt.Sprintf("emits %s\n", e))
}
if c.Instance != "" {
buf.WriteString(fmt.Sprintf("instance %s\n", c.Instance))
}
if c.Expect != "" {
buf.WriteString(fmt.Sprintf("expect %s\n", c.Expect))
}
if c.Respawn {
buf.WriteString("respawn\n")
}
if len(c.Limit) > 0 {
ls := strings.Join(c.Limit, " ")
buf.WriteString(fmt.Sprintf("limit %s\n", ls))
}
if c.Console != "" {
buf.WriteString(fmt.Sprintf("console %s\n", c.Console))
}
if c.Directory != "" {
buf.WriteString(fmt.Sprintf("chdir %s\n", c.Directory))
}
for k, v := range c.Env {
buf.WriteString(fmt.Sprintf("env %s=\"%s\"\n", k, v))
}
for _, v := range c.KillSignal {
buf.WriteString(fmt.Sprintf("kill signal %s\n", v))
}
if c.KillTimeout != 0 {
buf.WriteString(fmt.Sprintf("kill timeout %d\n", c.KillTimeout))
}
if c.ReloadSignal != "" {
buf.WriteString(fmt.Sprintf("reload signal %s\n", c.ReloadSignal))
}
if c.Manual {
buf.WriteString("manual\n")
}
if c.Nice != -1 {
buf.WriteString(fmt.Sprintf("nice %d\n", c.Nice))
}
if c.OomScore != -1000 {
buf.WriteString(fmt.Sprintf("oom score %d\n", c.OomScore))
}
if c.SetGid != "" {
buf.WriteString(fmt.Sprintf("setgid %s\n", c.SetGid))
}
if c.SetUid != "" {
buf.WriteString(fmt.Sprintf("setuid %s\n", c.SetUid))
}
if c.Umask != -1 {
buf.WriteString(fmt.Sprintf("umask %03o\n", c.Umask))
}
if c.PreStart.Set() {
buf.WriteString(c.PreStart.Output("pre-start"))
}
if c.PostStart.Set() {
buf.WriteString(c.PostStart.Output("post-start"))
}
if c.PreStop.Set() {
buf.WriteString(c.PreStop.Output("pre-stop"))
}
if c.PostStop.Set() {
buf.WriteString(c.PostStop.Output("post-stop"))
}
if c.Script != "" {
s := fmt.Sprintf("script\n%s\nend script\n", c.Script.Indented())
buf.WriteString(s)
}
if c.Exec != "" {
buf.WriteString(fmt.Sprintf("exec %s\n", c.Exec))
}
return buf.Bytes()
}
func (c *Config) Install() error {
return InstallConfig(c.Name, c.Generate())
}
func (c *Config) Exists() bool {
_, err := os.Stat(filepath.Join(InitDir, c.Name+".conf"))
if err == nil {
return true
}
return false
}
func InstallConfig(name string, config []byte) error {
path := filepath.Join(InitDir, name+".conf")
return ioutil.WriteFile(path, config, 0644)
}