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diff --git a/src/ceph/src/mgr/MgrContext.h b/src/ceph/src/mgr/MgrContext.h
new file mode 100644
index 0000000..3268e5c
--- /dev/null
+++ b/src/ceph/src/mgr/MgrContext.h
@@ -0,0 +1,66 @@
+// -*- 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) 2016 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.
+ */
+
+#ifndef MGR_CONTEXT_H_
+#define MGR_CONTEXT_H_
+
+#include <memory>
+
+#include "common/ceph_json.h"
+#include "mon/MonClient.h"
+
+class Command
+{
+protected:
+  C_SaferCond cond;
+public:
+  bufferlist outbl;
+  std::string outs;
+  int r;
+
+  void run(MonClient *monc, const std::string &command)
+  {
+    monc->start_mon_command({command}, {},
+        &outbl, &outs, &cond);
+  }
+
+  virtual void wait()
+  {
+    r = cond.wait();
+  }
+
+  virtual ~Command() {}
+};
+
+
+class JSONCommand : public Command
+{
+public:
+  json_spirit::mValue json_result;
+
+  void wait() override
+  {
+    Command::wait();
+
+    if (r == 0) {
+      bool read_ok = json_spirit::read(
+          outbl.to_str(), json_result);
+      if (!read_ok) {
+        r = -EINVAL;
+      }
+    }
+  }
+};
+
+#endif
+