mitchellh/vagrant — pull request #2929 by mitchellh (2014-02-03 21:05:48+00:00)
Title: Provisioner Inheritance/Overriding

This allows provisioners to be overridden by sub-scopes (machine configs, provider overrides), allowing common provisioning to be put into the global scope and selectively overriding certain configurations. This allows for getting rid of a lot of duplication without having to know a lot of Ruby.

Completely documenting in the pull request (in website/docs commits), so read there.

This fixes #1113.