New validation method on the root that returns errors

lib/vagrant/config/v2/root.rb

@@ -39,24 +39,30 @@ module Vagrant
           end
         end
 
-        # Validates the configuration classes of this instance and raises an
-        # exception if they are invalid. If you are implementing a custom configuration
-        # class, the method you want to implement is {Base#validate}. This is
-        # the method that checks all the validation, not one which defines
-        # validation rules.
-        def validate!(env)
-          # Validate each of the configured classes and store the results into
-          # a hash.
-          errors = @keys.inject({}) do |container, data|
-            key, instance = data
-            recorder = ErrorRecorder.new
-            instance.validate(env, recorder)
-            container[key.to_sym] = recorder if !recorder.errors.empty?
-            container
+        # This validates the configuration and returns a hash of error
+        # messages by section. If there are no errors, an empty hash
+        # is returned.
+        #
+        # @param [Environment] env
+        # @return [Hash]
+        def validate(env)
+          # Go through each of the configuration keys and validate
+          errors = {}
+          @keys.each do |_key, instance|
+            if instance.respond_to?(:validate)
+              # Validate this single item, and if we have errors then
+              # we merge them into our total errors list.
+              result = instance.validate(env)
+              if result && !result.empty?
+                result.each do |key, value|
+                  errors[key] ||= []
+                  errors[key] += value
+                end
+              end
+            end
           end
 
-          return if errors.empty?
-          raise Errors::ConfigValidationFailed, :messages => Util::TemplateRenderer.render("config/validation_failed", :errors => errors)
+          errors
         end
 
         # Returns the internal state of the root object. This is used

test/unit/vagrant/config/v2/root_test.rb

@@ -31,4 +31,47 @@ describe Vagrant::Config::V2::Root do
       "keys"       => {}
     }
   end
+
+  describe "validation" do
+    let(:instance) do
+      map = { :foo => Object, :bar => Object }
+      described_class.new(map)
+    end
+
+    it "should return nil if valid" do
+      instance.validate({}).should == {}
+    end
+
+    it "should return errors if invalid" do
+      errors = { "foo" => ["errors!"] }
+      env    = { "errors" => errors }
+      foo    = instance.foo
+      def foo.validate(env)
+        env["errors"]
+      end
+
+      instance.validate(env).should == errors
+    end
+
+    it "should merge errors via array concat if matching keys" do
+      errors = { "foo" => ["errors!"] }
+      env    = { "errors" => errors }
+      foo    = instance.foo
+      bar    = instance.bar
+      def foo.validate(env)
+        env["errors"]
+      end
+
+      def bar.validate(env)
+        env["errors"].merge({ "bar" => ["bar"] })
+      end
+
+      expected_errors = {
+        "foo" => ["errors!", "errors!"],
+        "bar" => ["bar"]
+      }
+
+      instance.validate(env).should == expected_errors
+    end
+  end
 end