Override Vagrant configuration settings locally (per-dev)

Question

I\'d like the question to be answered in general, but to illustrate it, here\'s a use case:

I\'m using Vagrant for a simple LMAP project. I use standalone Puppet for pro

Answer 1

Here's an idea. It may be "ugly" and "wrong", but, at least, it works :)

# file2.rb, this is your per-dev configuration file
puts "included external file which uses outer var: #{foo}"

# file1.rb, this would be your Vagrantfile
puts 'first'
foo = 'bar'

external = File.read 'file2.rb'
eval external
puts 'second'

Let's run that

$ ruby file1.rb
first
included external file which uses outer var: bar
second

Adapting to your example, file2.rb would contain only usage of config without defining it (config will be provided from outer context)

  config.vm.provision :puppet do |puppet|
    puppet.facter = { "proxy" => "proxy.host:80" }
  end

And your Vagrant file may look like this:

Vagrant::Config.run do |config|
  external = File.read 'Vagrantfile.local'
  eval external

  # proceed with general settings here
  config.vm.provision :puppet do |puppet|
    puppet.facter = { "proxy" => "proxy.host:80" }
  end
end

Update (another, "data-driven" approach)

# Vagranfile.local
config_values[:puppet][:facter][:proxy] = 'proxy.host:80'

# Vargantfile
Vagrant::Config.run do |config|
  config_values = {
    puppet: {
      facter: {
        proxy: nil
      },
      manifests_file: 'my_manifest.pp'

    }
  }
  external = File.read 'Vagrantfile.local'
  eval external # this should overwrite proxy config

  # proceed with general settings here
  config.vm.provision :puppet do |puppet|
    if config_values[:puppet][:facter][:proxy]
      puppet.facter = { "proxy" => config_values[:puppet][:facter][:proxy] } 
    end

    puppet.manifests_file = config_values[:puppet][:manifests_file]
  end
end