Merge pull request #453 from jkfm/add_hook_for_new_user

Add hook for new users

integration-tests/plugins/simplest/tljh_simplest.py

@@ -46,3 +46,9 @@ def tljh_custom_jupyterhub_config(c):
 def tljh_post_install():
     with open('test_post_install', 'w') as f:
         f.write('123456789')
+
+
+@hookimpl
+def tljh_new_user_create(username):
+    with open('test_new_user_create', 'w') as f:
+        f.write("a new userfile")

integration-tests/test_simplest_plugin.py

@@ -72,3 +72,13 @@ def test_post_install_hook():
         content = f.read()
 
     assert content == "123456789"
+
+
+def test_tljh_new_user_create():
+    """
+    Test that plugin receives username as arg
+    """
+    with open("test_new_user_create") as f:
+        content = f.read()
+
+    assert content == "a new userfile"

tljh/hooks.py

@@ -69,3 +69,11 @@ def tljh_post_install():
     This can be arbitrary Python code.
     """
     pass
+
+@hookspec
+def tljh_new_user_create(username):
+    """
+    Script to be executed after a new user has been added.
+    This can be arbitrary Python code.
+    """
+    pass

tljh/jupyterhub_config.py

@@ -4,13 +4,12 @@ JupyterHub config for the littlest jupyterhub.
 
 from glob import glob
 import os
-import pluggy
 
 from systemdspawner import SystemdSpawner
-from tljh import configurer, user, hooks
+from tljh import configurer, user
 from tljh.config import INSTALL_PREFIX, USER_ENV_PREFIX, CONFIG_DIR
 from tljh.normalize import generate_system_username
-from tljh.yaml import yaml
+from tljh.utils import get_plugin_manager
 from jupyterhub_traefik_proxy import TraefikTomlProxy
 
 from traitlets import Dict, Unicode, List
@@ -68,11 +67,8 @@ configurer.apply_config(tljh_config, c)
 
 # Let TLJH hooks modify `c` if they want
 
-# Set up plugin infrastructure
-pm = pluggy.PluginManager('tljh')
-pm.add_hookspecs(hooks)
-pm.load_setuptools_entrypoints('tljh')
 # Call our custom configuration plugin
+pm = get_plugin_manager()
 pm.hook.tljh_custom_jupyterhub_config(c=c)
 
 # Load arbitrary .py config files if they exist.

tljh/user.py

@@ -3,11 +3,14 @@ User management for tljh.
 
 Supports minimal user & group management
 """
-import pwd
 import grp
+import pwd
 import subprocess
 from os.path import expanduser
 
+# Set up plugin infrastructure
+from tljh.utils import get_plugin_manager
+
 
 def ensure_user(username):
     """
@@ -34,6 +37,9 @@ def ensure_user(username):
         expanduser('~{username}'.format(username=username))
     ])
 
+    pm = get_plugin_manager()
+    pm.hook.tljh_new_user_create(username=username)
+
 
 def remove_user(username):
     """

tljh/utils.py

@@ -1,11 +1,15 @@
 """
-Miscelaneous functions useful in at least two places unrelated to each other
+Miscellaneous functions useful in at least two places unrelated to each other
 """
-import subprocess
 import logging
-
+import subprocess
 
 # Copied into bootstrap/bootstrap.py. Make sure these two copies are exactly the same!
+import pluggy
+
+from tljh import hooks
+
+
 def run_subprocess(cmd, *args, **kwargs):
     """
     Run given cmd with smart output behavior.
@@ -34,3 +38,15 @@ def run_subprocess(cmd, *args, **kwargs):
         # This produces multi line log output, unfortunately. Not sure how to fix.
         # For now, prioritizing human readability over machine readability.
         logger.debug(proc.stdout.decode())
+
+
+def get_plugin_manager():
+    """
+    Return plugin manager instance
+    """
+    # Set up plugin infrastructure
+    pm = pluggy.PluginManager('tljh')
+    pm.add_hookspecs(hooks)
+    pm.load_setuptools_entrypoints('tljh')
+
+    return pm