ISLET Updates

[Jon Schipp]

I've added a lot of new features to ISLET this week.

Features:
* Plugin system - where user scripts can be used to extend functionality. 

  Currently ships with 4 scripts:
    a.) Clear the screen

    b.) Restart the ISLET session without reconnecting (great for seeing newly added changes)

    c.) Delete the current user account

    d.) Delete a training environment

    More to come

* Support setting your own Docker entrypoint command via new COMMAND variable

  e.g. COMMAND="sudo -i -u $VIRTUSER"

         COMMAND="su $VIRTUSER"

         COMMAND="bash"

         COMMAND="top"

* Support setting the working directory via WORKDIR in configs

* Improved method of setting environment variables in the container using new variable ENVS
  In a per image config:

  ...
  export class="cs101"
  export instructor="jschipp"
  ENVS="class instructor"

  ...

  From the training environment a user can access these variables:

  container> echo $class
  cs101

Bugs fixes:

* Use of ENABLE or VISIBLE now works properly

Thanks

--

Jon Schipp, 

jonschipp.com, sickbits.net, open-nsm.net,