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$module_name is not documented. Suggest we add it to http://docs.puppetlabs.com/learning/variables.html
#1 Updated by Cody Herriges about 2 years ago
To be more specific. Usage of $module_name and $caller_module_name should be more thoroughly explained as part of our documentation, beyond what is available at http://docs.puppetlabs.com/guides/faq.html. What affect does the caller_module_name variable have when it is defined or redefined as part of a override and does it have scoping implications, e.g. try inheriting a class vs. including it. If you include the variable is evaluated in the scope it is included in, if you inherit it is evaluated it in the scope it was defined. Same goes for module_name since it behaves differently, always being evaluated in the class it was defined.