[Freeipa-devel] [PATCH] jderose 007 part1 of limiting param to certain contexts

[Jason Gerard DeRose]

Both Andrew and Rob have requested the ability to limit a parameter to
certain contexts (server, cli, webui, whatever).

I had started work on this a while ago (not all of it ever made it into
master), but my previous work only allowed you to specify contexts you
wanted a param active in... you couldn't instead specify contexts you
*didn't* want a param to be active in.

So this patch removes the Param.limit_to kwarg and adds Param.incude and
Param.exclude kwargs.  For example:

Str('webui', include=['webui'])  # Only active when in 'webui' context.

Str('client_only', exclude=['server'])  # All contexts except 'server'

Only the 'include' or 'exclude' kwarg can be specified at once; if you
provide both, a ValueError is raised.

This patch also adds a new frontend.UsesParams base class with methods
implementing the filtering.  This new functionality doesn't do anything
yet till I change Command and Object to subclass from UsesParams, which
will come in a separate patch.

Lastly, this patch also includes fairly extensive tests for these new
features (UsesParams is at this point tested only through doctests).


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