create neccessary parent folder if path does not exists

utils.go

@@ -213,10 +213,18 @@ func contains(needle int, haystack []int) bool {
 	return false
 }
 
+// appendFile appends to a file, create the file if not exists
 func appendFile(path string, content string) error {
 	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
-		return tracerr.Wrap(err)
+		if err != os.ErrNotExist {
+			return tracerr.Wrap(err)
+		}
+		// create the neccessary parent directory
+		err = os.MkdirAll(filepath.Dir(expandFilePath(path)), os.ModePerm)
+		if err != nil {
+			return err
+		}
 	}
 	defer f.Close()
 	if _, err := f.WriteString(content); err != nil {