Fix temp binary not starting correclty (#583)

* fix strange temp binary file behavior:

if the binary ends with -temp gets restarted all over

* add some useful logs

* Systray.Start() was called even if the program have to restart

* added useful prints

* replace fmt with a proper logger

Author: umbynos

Diff for: main.go

@@ -132,30 +132,33 @@ func main() {
 
 	// If the executable is temporary, copy it to the full path, then restart
 	if strings.Contains(path, "-temp") {
-		err := copyExe(path, updater.BinPath(path))
+		newPath := updater.BinPath(path)
+		err := copyExe(path, newPath)
 		if err != nil {
+			log.Println("Copy error: ", err)
 			panic(err)
 		}
 
-		Systray.Restart()
+		Systray.Update(newPath)
 	} else {
 		// Otherwise copy to a path with -temp suffix
 		err := copyExe(path, updater.TempPath(path))
 		if err != nil {
 			panic(err)
 		}
+		Systray.Start()
 	}
-
-	Systray.Start()
 }
 
 func copyExe(from, to string) error {
 	data, err := ioutil.ReadFile(from)
 	if err != nil {
+		log.Println("Cannot read file: ", from)
 		return err
 	}
 	err = ioutil.WriteFile(to, data, 0755)
 	if err != nil {
+		log.Println("Cannot write file: ", to)
 		return err
 	}
 	return nil

Diff for: systray/systray.go

@@ -5,6 +5,8 @@ import (
 	"os/exec"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/kardianos/osext"
 )
 
@@ -26,14 +28,15 @@ type Systray struct {
 // it works by finding the executable path and launching it before quitting
 func (s *Systray) Restart() {
 
-	fmt.Println(s.path)
-	fmt.Println(osext.Executable())
 	if s.path == "" {
+		log.Println("Update binary path not set")
 		var err error
 		s.path, err = osext.Executable()
 		if err != nil {
-			fmt.Printf("Error getting exe path using osext lib. err: %v\n", err)
+			log.Printf("Error getting exe path using osext lib. err: %v\n", err)
 		}
+	} else {
+		log.Println("Starting updated binary: ", s.path)
 	}
 
 	// Trim newlines (needed on osx)
@@ -50,7 +53,7 @@ func (s *Systray) Restart() {
 	cmd := exec.Command(s.path, args...)
 	err := cmd.Start()
 	if err != nil {
-		fmt.Printf("Error restarting process: %v\n", err)
+		log.Printf("Error restarting process: %v\n", err)
 		return
 	}