fix symbolic links issue on Linux. (#281)

Former-commit-id: 84a15d1ff70cbdcb91aaa7a40cb86604f036e349 [formerly 60e5a702fd98686193c5ee7bfb66698453de05ae] [formerly b863bd64cfc4e953c005f71ccc3fd936456b8a5e [formerly d269e239bf]]
Former-commit-id: 24b6c15a5c3a54a866106eff843bea0d7401cf15 [formerly 6b6c3036a90776bb16d93a4b7e864e4f433f5531]
Former-commit-id: 5b7aacabf2ceb1a5303fd303d5132bbdd711362f

file.go

@@ -133,6 +133,16 @@ func (i *File) GetListing(u *User, r *http.Request) error {
 			continue
 		}
 
+		if strings.HasPrefix(f.Mode().String(), "L") {
+			// It's a symbolic link
+			// The FileInfo from Readdir treats symbolic link as a file only.
+			info, err := os.Stat(f.Name())
+			if err != nil {
+				return err
+			}
+			f = info
+		}
+
 		if f.IsDir() {
 			name += "/"
 			dirCount++