Add FreeBSD support (#197)

* Add FreeBSD support

* freebsd: use service cmd instead of rc script directly

service_freebsd.go

@@ -0,0 +1,220 @@
+// Copyright 2019 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 (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+	"text/template"
+)
+
+const version = "freebsd"
+
+type freebsdSystem struct{}
+
+func (freebsdSystem) String() string {
+	return version
+}
+func (freebsdSystem) Detect() bool {
+	return true
+}
+func (freebsdSystem) Interactive() bool {
+	return interactive
+}
+func (freebsdSystem) New(i Interface, c *Config) (Service, error) {
+	s := &freebsdService{
+		i:      i,
+		Config: c,
+	}
+
+	return s, nil
+}
+
+func init() {
+	ChooseSystem(freebsdSystem{})
+}
+
+var interactive = false
+
+func init() {
+	var err error
+	interactive, err = isInteractive()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func isInteractive() (bool, error) {
+	return os.Getenv("IS_DAEMON") != "1", nil
+}
+
+type freebsdService struct {
+	i Interface
+	*Config
+}
+
+func (s *freebsdService) String() string {
+	if len(s.DisplayName) > 0 {
+		return s.DisplayName
+	}
+	return s.Name
+}
+
+func (s *freebsdService) Platform() string {
+	return version
+}
+
+func (s *freebsdService) template() *template.Template {
+	functions := template.FuncMap{
+		"bool": func(v bool) string {
+			if v {
+				return "true"
+			}
+			return "false"
+		},
+	}
+
+	customConfig := s.Option.string(optionSysvScript, "")
+
+	if customConfig != "" {
+		return template.Must(template.New("").Funcs(functions).Parse(customConfig))
+	} else {
+		return template.Must(template.New("").Funcs(functions).Parse(rcScript))
+	}
+}
+
+func (s *freebsdService) configPath() (cp string, err error) {
+	cp = "/usr/local/etc/rc.d/" + s.Config.Name
+	return
+}
+
+func (s *freebsdService) Install() error {
+	path, err := s.execPath()
+	if err != nil {
+		return err
+	}
+
+	// write start script
+	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()
+
+	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
+	}
+
+	return nil
+}
+
+func (s *freebsdService) Uninstall() error {
+	cp, err := s.configPath()
+	if err != nil {
+		return err
+	}
+	return os.Remove(cp)
+}
+
+func (s *freebsdService) Status() (Status, error) {
+	cp, err := s.configPath()
+	if err != nil {
+		return StatusUnknown, err
+	}
+
+	if _, err = os.Stat(cp); os.IsNotExist(err) {
+		return StatusStopped, ErrNotInstalled
+	}
+
+	status, _, err := runCommand("service", false, s.Name, "status")
+	if status == 1 {
+		return StatusStopped, nil
+	} else if err != nil {
+		return StatusUnknown, err
+	}
+	return StatusRunning, nil
+}
+
+func (s *freebsdService) Start() error {
+	return run("service", s.Name, "start")
+}
+
+func (s *freebsdService) Stop() error {
+	return run("service", s.Name, "stop")
+}
+
+func (s *freebsdService) Restart() error {
+	return run("service", s.Name, "restart")
+}
+
+func (s *freebsdService) Run() error {
+	var 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 *freebsdService) Logger(errs chan<- error) (Logger, error) {
+	if interactive {
+		return ConsoleLogger, nil
+	}
+	return s.SystemLogger(errs)
+}
+
+func (s *freebsdService) SystemLogger(errs chan<- error) (Logger, error) {
+	return newSysLogger(s.Name, errs)
+}
+
+var rcScript = `#!/bin/sh
+
+# PROVIDE: {{.Name}}
+# REQUIRE: SERVERS
+# KEYWORD: shutdown
+
+. /etc/rc.subr
+
+name="{{.Name}}"
+{{.Name}}_env="IS_DAEMON=1"
+pidfile="/var/run/${name}.pid"
+command="/usr/sbin/daemon"
+daemon_args="-P ${pidfile} -r -t \"${name}: daemon\"{{if .WorkingDirectory}} -c {{.WorkingDirectory}}{{end}}"
+command_args="${daemon_args} {{.Path}}{{range .Arguments}} {{.}}{{end}}"
+
+run_rc_command "$1"
+`

service_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a zlib-style
 // license that can be found in the LICENSE file.
 
-// +build linux darwin solaris aix
+// +build linux darwin solaris aix freebsd
 
 package service