AdGuard Home as a system service

1. Reworked working with command-line arguments
2. Added service control actions: install/uninstall/start/stop/status
3. Added log settings to the configuration file
4. Updated the README file

service.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"os"
+
+	"github.com/hmage/golibs/log"
+	"github.com/kardianos/service"
+)
+
+// Represents the program that will be launched by a service or daemon
+type program struct {
+}
+
+// Start should quickly start the program
+func (p *program) Start(s service.Service) error {
+	// Start should not block. Do the actual work async.
+	args := options{}
+	go run(args)
+	return nil
+}
+
+// Stop stops the program
+func (p *program) Stop(s service.Service) error {
+	// Stop should not block. Return with a few seconds.
+	cleanup()
+	return nil
+}
+
+// handleServiceControlAction one of the possible control actions:
+// install -- installs a service/daemon
+// uninstall -- uninstalls it
+// status -- prints the service status
+// start -- starts the previously installed service
+// stop -- stops the previously installed service
+// restart - restarts the previously installed service
+func handleServiceControlAction(action string) {
+	log.Printf("Service control action: %s", action)
+
+	pwd, err := os.Getwd()
+	if err != nil {
+		log.Fatal("Unable to find the path to the current directory")
+	}
+	svcConfig := &service.Config{
+		Name:             "AdGuardHome",
+		DisplayName:      "AdGuard Home service",
+		Description:      "AdGuard Home: Network-level blocker",
+		WorkingDirectory: pwd,
+	}
+	prg := &program{}
+	s, err := service.New(prg, svcConfig)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if action == "status" {
+		status, errSt := s.Status()
+		if errSt != nil {
+			log.Fatalf("failed to get service status: %s", errSt)
+		}
+
+		switch status {
+		case service.StatusUnknown:
+			log.Printf("Service status is unknown")
+		case service.StatusStopped:
+			log.Printf("Service is stopped")
+		case service.StatusRunning:
+			log.Printf("Service is running")
+		}
+	} else {
+		err = service.Control(s, action)
+		if err != nil {
+			log.Fatal(err)
+		}
+		log.Printf("Action %s has been done successfully", action)
+	}
+}