From 068d9cc8b8b651aaaabd3de71f6678f56c38917c Mon Sep 17 00:00:00 2001
From: Fabio Rehm <fgrehm@gmail.com>
Date: Sat, 3 Aug 2013 14:51:31 -0300
Subject: [PATCH] Validate machine scopes from config object and show a nice
 looking message instead of a stacktrace :)

This should be enough to close #33
---
 lib/vagrant-cachier/config.rb | 14 ++++++++++++++
 locales/en.yml                |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/lib/vagrant-cachier/config.rb b/lib/vagrant-cachier/config.rb
index b3fcda0..a450505 100644
--- a/lib/vagrant-cachier/config.rb
+++ b/lib/vagrant-cachier/config.rb
@@ -4,6 +4,8 @@ module VagrantPlugins
       attr_accessor :scope, :auto_detect, :enable_nfs
       attr_reader   :buckets
 
+      ALLOWED_SCOPES = %w( box machine )
+
       def initialize
         @scope       = UNSET_VALUE
         @auto_detect = UNSET_VALUE
@@ -14,6 +16,18 @@ module VagrantPlugins
         (@buckets ||= {})[bucket] = opts
       end
 
+      def validate(machine)
+        errors = _detected_errors
+
+        if enabled? && ! ALLOWED_SCOPES.include?(@scope.to_s)
+          errors << I18n.t('vagrant_cachier.unknown_cache_scope',
+                            allowed:     ALLOWED_SCOPES.inspect,
+                            cache_scope: @scope)
+        end
+
+        { "vagrant cachier" => errors }
+      end
+
       def finalize!
         return unless enabled?
 
diff --git a/locales/en.yml b/locales/en.yml
index 52dc977..ec6d39a 100644
--- a/locales/en.yml
+++ b/locales/en.yml
@@ -4,3 +4,5 @@ en:
       Removing cache buckets symlinks...
     skipping_bucket: |-
       Skipping %{bucket} cache bucket as the guest machine does not support it
+    unknown_cache_scope: |-
+      Unknown cache scope '%{cache_scope}' (allowed scopes: %{allowed})