From ce898be69ac2a7f5128ac569de9752e5403e4019 Mon Sep 17 00:00:00 2001
From: Jeremy Tuloup <jeremy.tuloup@gmail.com>
Date: Mon, 25 Apr 2022 17:41:02 +0200
Subject: [PATCH] Copy logic for preferred path

---
 notebook/app.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/notebook/app.py b/notebook/app.py
index 878fbcc6a..c06fd7ed5 100644
--- a/notebook/app.py
+++ b/notebook/app.py
@@ -59,6 +59,20 @@ class NotebookBaseHandler(ExtensionHandlerJinjaMixin, ExtensionHandlerMixin, Jup
             api_token = os.getenv("JUPYTERHUB_API_TOKEN", "")
             page_config["token"] = api_token
 
+        server_root = self.settings.get("server_root_dir", "")
+        server_root = server_root.replace(os.sep, "/")
+        server_root = os.path.normpath(os.path.expanduser(server_root))
+        try:
+            # Remove the server_root from pref dir
+            if self.serverapp.preferred_dir != server_root:
+                page_config["preferredPath"] = "/" + os.path.relpath(
+                    self.serverapp.preferred_dir, server_root
+                )
+            else:
+                page_config["preferredPath"] = "/"
+        except Exception:
+            page_config["preferredPath"] = "/"
+
         mathjax_config = self.settings.get("mathjax_config", "TeX-AMS_HTML-full,Safe")
         # TODO Remove CDN usage.
         mathjax_url = self.settings.get(