* Prints an error message and quit in case Jupyter

did not start after 2 minutes.

turing/calculations/launch_jupyter

@@ -88,13 +88,24 @@ echo " * launching jupyter notebook server"
 (srun -n 1 -c 2 -J juypter "${SLURM_ARGS[@]}" jupyter-notebook --no-browser --port=$((8000 + $RANDOM % 1000)) --ip=0.0.0.0 2>&1 | tee $jupyter_output > /dev/null) &
 
 echo " * waiting for Jupyter server to be ready ..."
-for ((i=0; i < 90; ++i)); do
+for ((i=0; i < 120; ++i)); do
         tokens=$(awk -F: '/  http:/ {print $3}'        $jupyter_output)
         if [ -n "$tokens" ]; then
                 break
         fi
         sleep 1s
 done
+if [ -z "$tokens" ]; then
+        echo "Error: Cannot find the Jupyter server URL!"
+        echo
+        echo "Dump of Jupyter process output:"
+        echo "-------------------------------"
+        cat $jupyter_output
+        echo
+        echo "Exiting due to error..."
+        exit 2
+fi
+
 # Don't use echo to avoid divulging the token (!!)
 port=${tokens%/*}
 token=${tokens#*token=}