fix Cmd and CopyFile

backend-golang/file.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"time"
 )
 
@@ -100,6 +101,11 @@ func (a *App) CopyFile(src string, dst string) error {
 	}
 	defer sourceFile.Close()
 
+	err = os.MkdirAll(dst[:strings.LastIndex(dst, "/")], 0755)
+	if err != nil {
+		return err
+	}
+
 	destFile, err := os.Create(dst)
 	if err != nil {
 		return err

backend-golang/utils.go

@@ -15,6 +15,11 @@ import (
 )
 
 func Cmd(args ...string) (string, error) {
+	path, err := filepath.Abs(args[0])
+	if err != nil {
+		return "", err
+	}
+	args[0] = path
 	if runtime.GOOS == "windows" {
 		_, err := os.Stat("cmd-helper.bat")
 		if err != nil {