From baef6d0bd9490d0f1ddbacf8bea129e10c998479 Mon Sep 17 00:00:00 2001
From: Romain Primet <romain.primet@inria.fr>
Date: Fri, 13 Jul 2018 15:55:41 +0200
Subject: [PATCH] handle transient 404

---
 tljh/installer.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tljh/installer.py b/tljh/installer.py
index 4dd94fd..0ceb417 100644
--- a/tljh/installer.py
+++ b/tljh/installer.py
@@ -2,6 +2,7 @@ import sys
 import os
 import tljh.systemd as systemd
 import tljh.conda as conda
+from urllib.error import HTTPError
 from urllib.request import urlopen, URLError
 from tljh import user
 import secrets
@@ -151,6 +152,13 @@ def ensure_jupyterhub_running(times=4):
                 continue
             # Everything else should immediately abort
             raise
+        except HTTPError as h:
+            if h.code == 404:
+                # May be transient
+                time.sleep(1)
+                continue
+            # Everything else should immediately abort
+            raise
 
     raise Exception("Installation failed: JupyterHub did not start in {}s".format(times))