[Tutor] rexec-environ

[Michael P. Reilly]

Risto Peranen wrote
> Hey all. I'm still making a game which I need your help once again.
> We are planning to do python applets for the game. That's way everyone
> can extend our engine very easily. I have read rexec-howto and it's seems
> quite nice for our purposes but how can one make more restricted
> environment. Since game will run also win32-platforms it's important that
> applets may not open files. How do you do that (with rexec(?))?

By default, a RExec instance allows you to open files for reading only.
But that is handled by a r_open method that you can override in a
subclass.

class NoOpenRExec(RExec):
  def r_open(self, file, mode='r', buf=-1):
    raise IOError, "can't open files in restricted mode"

This method is set as the built-in 'open' function in the rexec
environment.

  -Arcege

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+----------------------------------+-----------------------------------+
| Michael P. Reilly                | arcege@speakeasy.net              |