Nice error message given if ".vagrant" is a directory and therefore can't be accessed. [closes GH-172]

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## 0.6.5 (unreleased)
 
+  - A nice error message is given if ".vagrant" is a directory and therefore
+    can't be accessed. [GH-172]
   - Fix plugin loading in a Rails 2.3.x project. [GH-176]
 
 ## 0.6.4 (October 4, 2010)

lib/vagrant/data_store.rb

@@ -24,6 +24,8 @@ module Vagrant
       end
     rescue Errno::ENOENT
       clear
+    rescue Errno::EISDIR
+      raise Errors::DotfileIsDirectory
     end
 
     # Commits any changes to the data to disk. Even if the data

lib/vagrant/errors.rb

@@ -133,6 +133,11 @@ module Vagrant
       error_key(:config_validation)
     end
 
+    class DotfileIsDirectory < VagrantError
+      status_code(46)
+      error_key(:dotfile_is_directory)
+    end
+
     class DownloaderFileDoesntExist < VagrantError
       status_code(37)
       error_key(:file_missing, "vagrant.downloaders.file")

templates/locales/en.yml

@@ -15,6 +15,12 @@ en:
         are printed below:
 
         %{messages}
+      dotfile_is_directory: |-
+        The local file Vagrant uses to store data ".vagrant" already exists
+        and is a directory! If you are in your home directory, then please run
+        this command in another directory. If you aren't in a home directory,
+        then please rename ".vagrant" to something else, or configure Vagrant
+        to use another filename by modifying `config.vagrant.dotfile_name`.
       interrupted: Vagrant exited after cleanup due to external interrupt.
       multi_vm_required: A multi-vm environment is required for name specification to this command.
       multi_vm_target_required: `vagrant %{command}` requires a specific VM name to target in a multi-VM environment.

test/vagrant/data_store_test.rb

@@ -1,3 +1,4 @@
+require "fileutils"
 require "test_helper"
 
 class DataStoreTest < Test::Unit::TestCase
@@ -11,7 +12,15 @@ class DataStoreTest < Test::Unit::TestCase
   end
 
   teardown do
-    File.delete(@db_file) if File.file?(@db_file)
+    File.delete(@db_file) if File.exist?(@db_file)
+  end
+
+  should "raise an exception if the db file is a directory" do
+    file = tmp_path.join("data_store_folder_test")
+    FileUtils.mkdir_p(file)
+    assert_raises (Vagrant::Errors::DotfileIsDirectory) {
+      @klass.new(file)
+    }
   end
 
   should "be a hash with indifferent access" do