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diff --git a/omaha_response_handler_action.h b/omaha_response_handler_action.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_RESPONSE_HANDLER_ACTION_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_RESPONSE_HANDLER_ACTION_H__
+
+#include <string>
+#include "update_engine/action.h"
+#include "update_engine/install_plan.h"
+#include "update_engine/update_check_action.h"
+
+// This class reads in an Omaha response and converts what it sees into
+// an install plan which is passed out.
+
+namespace chromeos_update_engine {
+
+class OmahaResponseHandlerAction;
+
+template<>
+class ActionTraits<OmahaResponseHandlerAction> {
+ public:
+  typedef UpdateCheckResponse InputObjectType;
+  typedef InstallPlan OutputObjectType;
+};
+
+class OmahaResponseHandlerAction : public Action<OmahaResponseHandlerAction> {
+ public:
+  OmahaResponseHandlerAction() {}
+  typedef ActionTraits<OmahaResponseHandlerAction>::InputObjectType
+      InputObjectType;
+  typedef ActionTraits<OmahaResponseHandlerAction>::OutputObjectType
+      OutputObjectType;
+  void PerformAction();
+
+  // This is a synchronous action, and thus TerminateProcessing() should
+  // never be called
+  void TerminateProcessing() { CHECK(false); }
+
+  // For unit-testing
+  void set_boot_device(const std::string& boot_device) {
+    boot_device_ = boot_device;
+  }
+
+  // Debugging/logging
+  static std::string StaticType() { return "OmahaResponseHandlerAction"; }
+  std::string Type() const { return StaticType(); }
+
+ private:
+  // Assumes you want to install on the "other" device, where the other
+  // device is what you get if you swap 1 for 2 or 3 for 4 or vice versa
+  // for the number at the end of the boot device. E.g., /dev/sda1 -> /dev/sda2
+  // or /dev/sda4 -> /dev/sda3
+  static bool GetInstallDev(const std::string& boot_dev,
+                            std::string* install_dev);
+
+  // set to non-empty in unit tests
+  std::string boot_device_;
+
+  DISALLOW_COPY_AND_ASSIGN(OmahaResponseHandlerAction);
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_RESPONSE_HANDLER_ACTION_H__