Set up pluggy before calling hooks in jupyter_config.py

tljh/jupyterhub_config.py

@@ -4,6 +4,7 @@ JupyterHub config for the littlest jupyterhub.
 
 from glob import glob
 import os
+import pluggy
 
 from systemdspawner import SystemdSpawner
 from tljh import configurer, user, hooks
@@ -58,7 +59,13 @@ tljh_config = configurer.load_config()
 configurer.apply_config(tljh_config, c)
 
 # Let TLJH hooks modify `c` if they want
-hooks.tljh_custom_jupyterhub_config(c)
+
+# Set up plugin infrastructure
+pm = pluggy.PluginManager('tljh')
+pm.add_hookspecs(hooks)
+pm.load_setuptools_entrypoints('tljh')
+# Call our custom configuration plugin
+pm.hook.tljh_custom_jupyterhub_config(c=c)
 
 # Load arbitrary .py config files if they exist.
 # This is our escape hatch