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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate(self):
 """ Validate the target environment """

        self.phase = PHASE.VALIDATE
        self.logger.info("Validating %s..." % self.namespace)
        self.instantiate_features()
        context_dict = {}
        if self.target:
            for s in self.target.formula_sections():
                context_dict["%s:root_dir" % s] = self.directory.install_directory(s)
                context_dict['config:root_dir'] = self.directory.root_dir
                context_dict['config:node'] = system.NODE
                self.target.add_additional_context(context_dict)
        for feature in self.features.run_order:
            self.run_action(feature, 'validate', run_if_error=True)