fix numeric notation of permissions

core/logs/file.go

@@ -67,6 +67,8 @@ type fileLogWriter struct {
 
 	Perm string `json:"perm"`
 
+	DirPerm string `json:"dirperm"`
+
 	RotatePerm string `json:"rotateperm"`
 
 	fileNameOnly, suffix string // like "project.log", project is fileNameOnly and .log is suffix
@@ -86,6 +88,7 @@ func newFileWriter() Logger {
 		RotatePerm: "0440",
 		Level:      LevelTrace,
 		Perm:       "0660",
+		DirPerm:    "0770",
 		MaxLines:   10000000,
 		MaxFiles:   999,
 		MaxSize:    1 << 28,
@@ -217,8 +220,13 @@ func (w *fileLogWriter) createLogFile() (*os.File, error) {
 		return nil, err
 	}
 
+	dirperm, err := strconv.ParseInt(w.DirPerm, 8, 64)
+	if err != nil {
+		return nil, err
+	}
+
 	filepath := path.Dir(w.Filename)
-	os.MkdirAll(filepath, os.FileMode(perm))
+	os.MkdirAll(filepath, os.FileMode(dirperm))
 
 	fd, err := os.OpenFile(w.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.FileMode(perm))
 	if err == nil {