Fix syntax error in jupyter-server-config Python file (#2286)

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/configmaps.tf

@@ -30,11 +30,21 @@ locals {
 resource "local_file" "jupyter_server_config_py" {
   content  = local.jupyter-notebook-config-py-template
   filename = "${path.module}/files/jupyter/jupyter_server_config.py"
+
+  provisioner "local-exec" {
+    # check the syntax of the config file without running it
+    command = "python -m py_compile ${self.filename}"
+  }
 }
 
 resource "local_file" "jupyter_jupyterlab_pioneer_config_py" {
   content  = local.jupyter-pioneer-config-py-template
   filename = "${path.module}/files/jupyter/jupyter_jupyterlab_pioneer_config.py"
+
+  provisioner "local-exec" {
+    # check the syntax of the config file without running it
+    command = "python -m py_compile ${self.filename}"
+  }
 }
 
 

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/files/jupyter/jupyter_jupyterlab_pioneer_config.py.tpl

@@ -3,7 +3,7 @@ import json
 
 
 default_log_format = "%(asctime)s %(levelname)9s %(lineno)4s %(module)s: %(message)s"
-log_format = ${log_format}
+log_format = "${log_format}"
 
 logging.basicConfig(
     level=logging.INFO,

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/files/jupyter/jupyter_server_config.py.tpl

@@ -4,14 +4,12 @@
 
 # Extra config available at:
 # https://zero-to-jupyterhub.readthedocs.io/en/1.x/jupyterhub/customizing/user-management.html#culling-user-pods
-
 # Enable Show Hidden Files menu option in View menu
 c.ContentsManager.allow_hidden = True
 c.FileContentsManager.allow_hidden = True
 
 # Set the preferred path for the frontend to start in
-preferred_dir = ${jupyterlab_preferred_dir}
-c.FileContentsManager.preferred_dir = preferred_dir if preferred_dir else None
+c.FileContentsManager.preferred_dir = "${jupyterlab_preferred_dir}"
 
 # Timeout (in seconds) in which a terminal has been inactive and ready to
 # be culled.