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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 (
"errors"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"text/template"
"time"
)
type sysv struct {
i Interface
platform string
*Config
}
func newSystemVService(i Interface, platform string, c *Config) (Service, error) {
s := &sysv{
i: i,
platform: platform,
Config: c,
}
return s, nil
}
func (s *sysv) String() string {
if len(s.DisplayName) > 0 {
return s.DisplayName
}
return s.Name
}
func (s *sysv) Platform() string {
return s.platform
}
var errNoUserServiceSystemV = errors.New("User services are not supported on SystemV.")
func (s *sysv) configPath() (cp string, err error) {
if s.Option.bool(optionUserService, optionUserServiceDefault) {
err = errNoUserServiceSystemV
return
}
cp = "/etc/init.d/" + s.Config.Name
return
}
func (s *sysv) template() *template.Template {
customScript := s.Option.string(optionSysvScript, "")
if customScript != "" {
return template.Must(template.New("").Funcs(tf).Parse(customScript))
} else {
return template.Must(template.New("").Funcs(tf).Parse(sysvScript))
}
}
func (s *sysv) Install() error {
confPath, err := s.configPath()
if err != nil {
return err
}
_, err = os.Stat(confPath)
if err == nil {
return fmt.Errorf("Init already exists: %s", confPath)
}
f, err := os.Create(confPath)
if err != nil {
return err
}
defer f.Close()
path, err := s.execPath()
if err != nil {
return err
}
var to = &struct {
*Config
Path string
}{
s.Config,
path,
}
err = s.template().Execute(f, to)
if err != nil {
return err
}
if err = os.Chmod(confPath, 0755); err != nil {
return err
}
for _, i := range [...]string{"2", "3", "4", "5"} {
if err = os.Symlink(confPath, "/etc/rc"+i+".d/S50"+s.Name); err != nil {
continue
}
}
for _, i := range [...]string{"0", "1", "6"} {
if err = os.Symlink(confPath, "/etc/rc"+i+".d/K02"+s.Name); err != nil {
continue
}
}
return nil
}
func (s *sysv) Uninstall() error {
cp, err := s.configPath()
if err != nil {
return err
}
if err := os.Remove(cp); err != nil {
return err
}
return nil
}
func (s *sysv) Logger(errs chan<- error) (Logger, error) {
if system.Interactive() {
return ConsoleLogger, nil
}
return s.SystemLogger(errs)
}
func (s *sysv) SystemLogger(errs chan<- error) (Logger, error) {
return newSysLogger(s.Name, errs)
}
func (s *sysv) Run() (err error) {
err = s.i.Start(s)
if err != nil {
return err
}
s.Option.funcSingle(optionRunWait, func() {
var sigChan = make(chan os.Signal, 3)
signal.Notify(sigChan, syscall.SIGTERM, os.Interrupt)
<-sigChan
})()
return s.i.Stop(s)
}
func (s *sysv) Status() (Status, error) {
_, out, err := runWithOutput("service", s.Name, "status")
if err != nil {
return StatusUnknown, err
}
switch {
case strings.HasPrefix(out, "Running"):
return StatusRunning, nil
case strings.HasPrefix(out, "Stopped"):
return StatusStopped, nil
default:
return StatusUnknown, ErrNotInstalled
}
}
func (s *sysv) Start() error {
return run("service", s.Name, "start")
}
func (s *sysv) Stop() error {
return run("service", s.Name, "stop")
}
func (s *sysv) Restart() error {
err := s.Stop()
if err != nil {
return err
}
time.Sleep(50 * time.Millisecond)
return s.Start()
}
const sysvScript = `#!/bin/sh
# For RedHat and cousins:
# chkconfig: - 99 01
# description: {{.Description}}
# processname: {{.Path}}
### BEGIN INIT INFO
# Provides: {{.Path}}
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: {{.DisplayName}}
# Description: {{.Description}}
### END INIT INFO
cmd="{{.Path}}{{range .Arguments}} {{.|cmd}}{{end}}"
name=$(basename $(readlink -f $0))
pid_file="/var/run/$name.pid"
stdout_log="/var/log/$name.log"
stderr_log="/var/log/$name.err"
[ -e /etc/sysconfig/$name ] && . /etc/sysconfig/$name
get_pid() {
cat "$pid_file"
}
is_running() {
[ -f "$pid_file" ] && ps $(get_pid) > /dev/null 2>&1
}
case "$1" in
start)
if is_running; then
echo "Already started"
else
echo "Starting $name"
{{if .WorkingDirectory}}cd '{{.WorkingDirectory}}'{{end}}
$cmd >> "$stdout_log" 2>> "$stderr_log" &
echo $! > "$pid_file"
if ! is_running; then
echo "Unable to start, see $stdout_log and $stderr_log"
exit 1
fi
fi
;;
stop)
if is_running; then
echo -n "Stopping $name.."
kill $(get_pid)
for i in $(seq 1 10)
do
if ! is_running; then
break
fi
echo -n "."
sleep 1
done
echo
if is_running; then
echo "Not stopped; may still be shutting down or shutdown may have failed"
exit 1
else
echo "Stopped"
if [ -f "$pid_file" ]; then
rm "$pid_file"
fi
fi
else
echo "Not running"
fi
;;
restart)
$0 stop
if is_running; then
echo "Unable to stop, will not attempt to start"
exit 1
fi
$0 start
;;
status)
if is_running; then
echo "Running"
else
echo "Stopped"
exit 1
fi
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit 0
`