I resync'd w/ the work done for 

160 Make IPS cross-platform for use across other supported OS's

and was disappointed to see code of the form:

try:
        from pkg.cfgfiles import *
        have_cfgfiles = True
except ImportError:
        have_cfgfiles = False

and 

        def install(self, pkgplan, orig):
                """client-side method that adds the user...
                   update any attrs that changed from orig
                   unless the on-disk stuff was changed"""

                if not have_cfgfiles:
                        # the user action is ignored if cfgfiles is not
available
                        return

this is a very clumsy, ad-hoc hack to disable user and group actions.  What
happens when the service action appears?  What about other Solaris-specific
features?  How are Windows only actions going to be handled?  Are we shipping
registry-editing actions on Solaris that are disabled if there's no C: drive?

How about designing per-platform actions?  By the way, you missed also
disabling
hardlink and link actions which don't work on windows either according to my
python docs.

Please folks, rethink the way you did this.  This doesn't scale.