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diff --git a/src/ceph/src/mgr/PyModuleRegistry.h b/src/ceph/src/mgr/PyModuleRegistry.h
new file mode 100644
index 0000000..5564e7f
--- /dev/null
+++ b/src/ceph/src/mgr/PyModuleRegistry.h
@@ -0,0 +1,173 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#pragma once
+
+// Python.h comes first because otherwise it clobbers ceph's assert
+#include "Python.h"
+
+#include <string>
+#include <map>
+#include <memory>
+
+#include "common/LogClient.h"
+
+#include "ActivePyModules.h"
+#include "StandbyPyModules.h"
+
+class PyModule
+{
+private:
+  const std::string module_name;
+  std::string get_site_packages();
+
+public:
+  SafeThreadState pMyThreadState;
+  PyObject *pClass = nullptr;
+  PyObject *pStandbyClass = nullptr;
+
+  PyModule(const std::string &module_name_)
+    : module_name(module_name_)
+  {
+  }
+
+  ~PyModule();
+
+  int load(PyThreadState *pMainThreadState);
+
+  std::string get_name() const {
+    return module_name;
+  }
+};
+
+/**
+ * This class is responsible for setting up the python runtime environment
+ * and importing the python modules.
+ *
+ * It is *not* responsible for constructing instances of their BaseMgrModule
+ * subclasses.
+ */
+class PyModuleRegistry
+{
+private:
+  mutable Mutex lock{"PyModuleRegistry::lock"};
+
+  LogChannelRef clog;
+
+  std::map<std::string, std::unique_ptr<PyModule>> modules;
+
+  std::unique_ptr<ActivePyModules> active_modules;
+  std::unique_ptr<StandbyPyModules> standby_modules;
+
+  PyThreadState *pMainThreadState;
+
+  // We have our own copy of MgrMap, because we are constructed
+  // before ClusterState exists.
+  MgrMap mgr_map;
+
+public:
+  static std::string config_prefix;
+
+  static void list_modules(std::set<std::string> *modules);
+
+  PyModuleRegistry(LogChannelRef clog_)
+    : clog(clog_)
+  {}
+
+  bool handle_mgr_map(const MgrMap &mgr_map_)
+  {
+    Mutex::Locker l(lock);
+
+    bool modules_changed = mgr_map_.modules != mgr_map.modules;
+    mgr_map = mgr_map_;
+
+    if (standby_modules != nullptr) {
+      standby_modules->handle_mgr_map(mgr_map_);
+    }
+
+    return modules_changed;
+  }
+
+  bool is_initialized() const
+  {
+    return mgr_map.epoch > 0;
+  }
+
+  int init(const MgrMap &map);
+
+  void active_start(
+                PyModuleConfig &config_,
+                DaemonStateIndex &ds, ClusterState &cs, MonClient &mc,
+                LogChannelRef clog_, Objecter &objecter_, Client &client_,
+                Finisher &f);
+  void standby_start(
+      MonClient *monc);
+
+  bool is_standby_running() const
+  {
+    return standby_modules != nullptr;
+  }
+
+  void active_shutdown();
+  void shutdown();
+
+  template<typename Callback, typename...Args>
+  void with_active_modules(Callback&& cb, Args&&...args) const
+  {
+    Mutex::Locker l(lock);
+    assert(active_modules != nullptr);
+
+    std::forward<Callback>(cb)(*active_modules, std::forward<Args>(args)...);
+  }
+
+  // FIXME: breaking interface so that I don't have to go rewrite all
+  // the places that call into these (for now)
+  // >>>
+  void notify_all(const std::string &notify_type,
+                  const std::string &notify_id)
+  {
+    if (active_modules) {
+      active_modules->notify_all(notify_type, notify_id);
+    }
+  }
+
+  void notify_all(const LogEntry &log_entry)
+  {
+    if (active_modules) {
+      active_modules->notify_all(log_entry);
+    }
+  }
+
+  std::vector<MonCommand> get_commands() const
+  {
+    assert(active_modules);
+    return active_modules->get_commands();
+  }
+  std::vector<ModuleCommand> get_py_commands() const
+  {
+    assert(active_modules);
+    return active_modules->get_py_commands();
+  }
+  void get_health_checks(health_check_map_t *checks)
+  {
+    assert(active_modules);
+    active_modules->get_health_checks(checks);
+  }
+  std::map<std::string, std::string> get_services() const
+  {
+    assert(active_modules);
+    return active_modules->get_services();
+  }
+  // <<< (end of ActivePyModules cheeky call-throughs)
+};