From ddd178cee9560a7ea2af4ae9b5e289647870e0fc Mon Sep 17 00:00:00 2001
From: "Christian Y. Brenninkmeijer"
 <christian.brenninkmeijer@manchester.ac.uk>
Date: Mon, 3 Jun 2024 09:49:55 +0100
Subject: [PATCH] better error message

---
 spinnman/spalloc/session.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/spinnman/spalloc/session.py b/spinnman/spalloc/session.py
index b58c7b01b..cb73dc77e 100644
--- a/spinnman/spalloc/session.py
+++ b/spinnman/spalloc/session.py
@@ -238,7 +238,10 @@ def renew(self) -> JsonObject:
                          self.__login_form_url, r.status_code)
             m = csrf_matcher.search(r.text)
             if not m:
-                raise SpallocException("could not establish temporary session")
+                 raise SpallocException(
+                    "Could not establish temporary session to "
+                    f"{self._service_url} for user {self.__username} "
+                    f"with a {len(self.__password)} character password")
             csrf = m.group(1)
             session = r.cookies[_SESSION_COOKIE]