Add maintd utility function to annotate all its opcodes

The maintenance daemon will submit jobs. As per design, they will be
indicated as originating from the maintenance daemon in the reason
trail. Add a utility function to do this annotation.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>

Makefile.am

@@ -974,6 +974,7 @@ HS_LIB_SRCS = \
 	src/Ganeti/Logging/WriterLog.hs \
 	src/Ganeti/Luxi.hs \
 	src/Ganeti/MaintD/Server.hs \
+	src/Ganeti/MaintD/Utils.hs \
 	src/Ganeti/Network.hs \
 	src/Ganeti/Objects.hs \
 	src/Ganeti/Objects/BitArray.hs \

src/Ganeti/Constants.hs

@@ -4787,6 +4787,9 @@ _opcodeReasonSrcMasterd = _opcodeReasonSrcDaemon ++ ":masterd"
 opcodeReasonSrcNoded :: String
 opcodeReasonSrcNoded = _opcodeReasonSrcDaemon ++ ":noded"
 
+opcodeReasonSrcMaintd :: String
+opcodeReasonSrcMaintd = _opcodeReasonSrcDaemon ++ ":maintd"
+
 opcodeReasonSrcOpcode :: String
 opcodeReasonSrcOpcode = "gnt:opcode"
 

src/Ganeti/MaintD/Utils.hs

+{-| Utility functions for the maintenance daemon.
+
+-}
+
+{-
+
+Copyright (C) 2015 Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+-}
+
+module Ganeti.MaintD.Utils
+  ( annotateOpCode
+  ) where
+
+import Control.Lens.Setter (over)
+
+import qualified Ganeti.Constants as C
+import Ganeti.JQueue (reasonTrailTimestamp)
+import Ganeti.JQueue.Objects (Timestamp)
+import Ganeti.OpCodes (OpCode, MetaOpCode, wrapOpCode)
+import Ganeti.OpCodes.Lens (metaParamsL, opReasonL)
+
+-- | Wrap an `OpCode` into a `MetaOpCode` and adding an indication
+-- that the `OpCode` was submitted by the maintenance daemon.
+annotateOpCode :: String -> Timestamp -> OpCode -> MetaOpCode
+annotateOpCode reason ts =
+  over (metaParamsL . opReasonL)
+    (++ [(C.opcodeReasonSrcMaintd, reason, reasonTrailTimestamp ts)])
+  . wrapOpCode