From 0311836f6927aec4ba5687ea12af35df3c509682 Mon Sep 17 00:00:00 2001
From: Suhas Daftuar <sdaftuar@gmail.com>
Date: Sun, 7 May 2017 14:10:19 -0400
Subject: Allow setting nMinimumChainWork on command line

---
 src/init.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/init.cpp')

diff --git a/src/init.cpp b/src/init.cpp
index 6114bbaa2d..6cacb9c8d5 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -354,6 +354,9 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     strUsage += HelpMessageOpt("-maxmempool=<n>", strprintf(_("Keep the transaction memory pool below <n> megabytes (default: %u)"), DEFAULT_MAX_MEMPOOL_SIZE));
     strUsage += HelpMessageOpt("-mempoolexpiry=<n>", strprintf(_("Do not keep transactions in the mempool longer than <n> hours (default: %u)"), DEFAULT_MEMPOOL_EXPIRY));
+    if (showDebug) {
+        strUsage += HelpMessageOpt("-minimumchainwork=<hex>", strprintf("Minimum work assumed to exist on a valid chain in hex (default: %s, testnet: %s)", defaultChainParams->GetConsensus().nMinimumChainWork.GetHex(), testnetChainParams->GetConsensus().nMinimumChainWork.GetHex()));
+    }
     strUsage += HelpMessageOpt("-persistmempool", strprintf(_("Whether to save the mempool on shutdown and load on restart (default: %u)"), DEFAULT_PERSIST_MEMPOOL));
     strUsage += HelpMessageOpt("-blockreconstructionextratxn=<n>", strprintf(_("Extra transactions to keep in memory for compact block reconstructions (default: %u)"), DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN));
     strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"),
@@ -970,6 +973,20 @@ bool AppInitParameterInteraction()
     else
         LogPrintf("Validating signatures for all blocks.\n");
 
+    if (gArgs.IsArgSet("-minimumchainwork")) {
+        const std::string minChainWorkStr = gArgs.GetArg("-minimumchainwork", "");
+        if (!IsHexNumber(minChainWorkStr)) {
+            return InitError(strprintf("Invalid non-hex (%s) minimum chain work value specified", minChainWorkStr));
+        }
+        nMinimumChainWork = UintToArith256(uint256S(minChainWorkStr));
+    } else {
+        nMinimumChainWork = UintToArith256(chainparams.GetConsensus().nMinimumChainWork);
+    }
+    LogPrintf("Setting nMinimumChainWork=%s\n", nMinimumChainWork.GetHex());
+    if (nMinimumChainWork < UintToArith256(chainparams.GetConsensus().nMinimumChainWork)) {
+        LogPrintf("Warning: nMinimumChainWork set below default value of %s\n", chainparams.GetConsensus().nMinimumChainWork.GetHex());
+    }
+
     // mempool limits
     int64_t nMempoolSizeMax = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
     int64_t nMempoolSizeMin = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000 * 40;
-- 
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