Create notebook directory on first login

[Craig Ching]

I want to create the notebook directory when my user logs in for the first time.  Looking through the issues, I found a couple of suggestions and am trying this:

from jupyterhub.spawner import LocalProcessSpawner

import os

class MySpawner(LocalProcessSpawner):

    def _notebook_dir_validate(self, value, trait):

        # Strip any trailing slashes

        # *except* if it's root

        _, path = os.path.splitdrive(value)

        if path == os.sep:

            return value

        value = value.rstrip(os.sep)

        if not os.path.isabs(value):

            # If we receive a non-absolute path, make it absolute.

            value = os.path.abspath(value)

        if not os.path.isdir(value):

            os.mkdir(value, mode=0o755)

        return value

c.JupyterHub.spawner_class = MySpawner

But I'm getting this when I start jupyterhub:

Traceback (most recent call last):                                     

  File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line

    yield self.initialize(argv)                                        

  File "/usr/lib/python3.5/types.py", line 179, in throw               

    return self.__wrapped.throw(tp, *rest)                             

  File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line

    yield self.init_spawners()                                         

  File "/usr/local/lib/python3.5/dist-packages/jupyterhub/app.py", line

    self.users[orm_user.id] = user = User(orm_user, self.tornado_settin

  File "/usr/local/lib/python3.5/dist-packages/jupyterhub/user.py", lin

    config=self.settings.get('config'),                                

  File "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py",

    inst.setup_instance(*args, **kwargs)                               

  File "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py",

    super(HasTraits, self).setup_instance(*args, **kwargs)             

  File "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py",

    value.instance_init(self)                                          

  File "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py",

    inst._register_validator(self, self.trait_names)                   

  File "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py",

    _deprecated_method(class_value, self.__class, magic_name,          

AttributeError: 'MySpawner' object has no attribute '_HasTraits__class'

What am I doing wrong?  Thanks for any help!

[Thomas Kluyver]

Looks like a bug in traitlets, I think this should fix it:
https://github.com/ipython/traitlets/pull/440

In the meantime, you can probably work around it by doing:

from traitlets import validate

class MySpawner(LocalProcessSpawner):

    @validate('notebook_dir')

    def _notebook_dir_validate(self, value, trait):
    ...

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[Craig Ching]

Hi takowl!

Thanks much for your help!

On Monday, August 14, 2017 at 4:43:04 AM UTC-5, takowl wrote:

from traitlets import validate

class MySpawner(LocalProcessSpawner):

    @validate('notebook_dir')

    def _notebook_dir_validate(self, value, trait):
    ...

I've done that, but now I'm getting:

TypeError: _notebook_dir_validate() missing 1 required positional argument: 'trait'

I've tried looking through the source code to see if I have the arguments defined correctly, but I'm afraid I'm not that strong at Python yet. 

[Thomas Kluyver]

Sorry, my mistake. The method should take just one argument like this:

@validate('notebook_dir')

def _validate_notebook_dir(self, proposal):

    value = proposal['value']
    ...

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