Added a --plugin-clean-sources parameter that will allow for

only those sources that are defined by the user to be used.

.gitignore

@@ -1,6 +1,10 @@
 # OS-specific
 .DS_Store
 
+# Editor swapfiles
+.*.sw?
+*~
+
 # Vagrant stuff
 acceptance_config.yml
 boxes/*

lib/vagrant/bundler.rb

@@ -178,11 +178,6 @@ module Vagrant
 
       f = File.open(Tempfile.new("vagrant").path + "2", "w+")
       f.tap do |gemfile|
-        if !sources.include?("http://rubygems.org")
-          gemfile.puts(%Q[source "https://rubygems.org"])
-        end
-
-        gemfile.puts(%Q[source "http://gems.hashicorp.com"])
         sources.each do |source|
           next if source == ""
           gemfile.puts(%Q[source "#{source}"])

plugins/commands/plugin/command/mixin_install_opts.rb

@@ -3,6 +3,11 @@ module VagrantPlugins
     module Command
       module MixinInstallOpts
         def build_install_opts(o, options)
+          options[:plugin_sources] = [
+            "https://rubygems.org",
+            "http://gems.hashicorp.com",
+          ]
+
           o.on("--entry-point NAME", String,
                "The name of the entry point file for loading the plugin.") do |entry_point|
             options[:entry_point] = entry_point
@@ -17,9 +22,13 @@ module VagrantPlugins
             puts
           end
 
+          o.on("--plugin-clean-sources", String,
+            "Remove all plugin sources defined so far (including defaults)") do
+            options[:plugin_sources] = []
+          end
+
           o.on("--plugin-source PLUGIN_SOURCE", String,
                "Add a RubyGems repository source") do |plugin_source|
-            options[:plugin_sources] ||= []
             options[:plugin_sources] << plugin_source
           end