cfg: support --clmtonly flag

This is used to test and benchmark the claimtrie rebuilding from a
previous downloaded and validated blocks.

btcd.go

@@ -159,6 +159,10 @@ func btcdMain(serverChan chan<- *server) error {
 			cfg.Listeners, err)
 		return err
 	}
+	if cfg.ClaimTrieOnly {
+		clmtLog.Infof("ClaimTrie has caught up the best height.")
+		return nil
+	}
 	defer func() {
 		btcdLog.Infof("Gracefully shutting down the server...")
 		server.Stop()

config.go

@@ -109,6 +109,7 @@ type config struct {
 	BlocksOnly           bool          `long:"blocksonly" description:"Do not accept transactions from remote peers."`
 	ConfigFile           string        `short:"C" long:"configfile" description:"Path to configuration file"`
 	ClaimTrieImpl        string        `long:"clmtimpl" description:"Implementation of ClaimTrie"`
+	ClaimTrieOnly        bool          `long:"clmtonly" description:"Rebuild ClaimTrie from the database on start up and then exits."`
 	ClaimTrieRecord      bool          `long:"clmtrecord" description:"Record claim operations made to ClaimTrie"`
 	ClaimTrieHeight      uint32        `long:"clmtheight" description:"Reset height of ClaimTrie"`
 	ConnectPeers         []string      `long:"connect" description:"Connect only to the specified peers at startup"`

doc.go

@@ -46,6 +46,7 @@ Application Options:
       --blocksonly            Do not accept transactions from remote peers.
   -C, --configfile=           Path to configuration file
 	    --clmtimpl=             Implementation of ClaimTrie
+	    --clmtonly=             Rebuild ClaimTrie from the database on start up and then exits.
 	    --clmtrecord=           Record claim operations
 	    --clmtheight=           Reset height of ClaimTrie
       --connect=              Connect only to the specified peers at startup