`vagrant package` checks for output file existing [closes GH-100]

lib/vagrant/actions/vm/package.rb

@@ -10,6 +10,8 @@ module Vagrant
         end
 
         def prepare
+          raise ActionException.new(:box_file_exists, :output_file => tar_path) if File.exist?(tar_path)
+
           # Verify the existance of all the additional files, if any
           include_files.each do |file|
             raise ActionException.new(:package_include_file_doesnt_exist, :filename => file) unless File.exists?(file)

templates/strings.yml

@@ -70,6 +70,12 @@
   A box with the name '<%= box_name %>' already exists, please use another name or use `vagrant box remove <%= box_name %>`
 :box_download_unknown_type: |-
   Unknown URI type for box download.
+:box_file_exists: |-
+  The specified output file for packaging already exists. Please move
+  the file or modify the output filename parameter then try to package
+  again.
+
+  Specified output file: <%= output_file %>
 :box_remove_doesnt_exist: |-
   The box you're attempting to remove does not exist!
 :box_specified_doesnt_exist: |-

test/vagrant/actions/vm/package_test.rb

@@ -226,6 +226,11 @@ class PackageActionTest < Test::Unit::TestCase
         @action.prepare
       end
 
+      should "raise an exception if the output file already exists" do
+        File.expects(:exist?).with(@action.tar_path).returns(false)
+        assert_raises(Vagrant::Actions::ActionException) { @action.prepare }
+      end
+
       should "raise an exception when an include file does not exist" do
         File.expects(:exists?).once.returns(false)
         assert_raises(Vagrant::Actions::ActionException) { @action.prepare }

vagrant.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new("> 1.3.1") if s.respond_to? :required_rubygems_version=
   s.authors = ["Mitchell Hashimoto", "John Bender"]
-  s.date = %q{2010-06-24}
+  s.date = %q{2010-06-29}
   s.default_executable = %q{vagrant}
   s.description = %q{Vagrant is a tool for building and distributing virtualized development environments.}
   s.email = ["mitchell.hashimoto@gmail.com", "john.m.bender@gmail.com"]