From 386037615ae02f972287a958d22a5bd2760626a7 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Wed, 30 Jan 2013 21:43:36 +0100
Subject: Make sure the genesis block is present after reindex

---
 src/main.cpp | 46 +++++++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 19 deletions(-)

(limited to 'src/main.cpp')

diff --git a/src/main.cpp b/src/main.cpp
index 847b1ea8a6..ee1d23c337 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2661,18 +2661,22 @@ bool LoadBlockIndex()
     if (!fReindex && !LoadBlockIndexDB())
         return false;
 
-    //
-    // Init with genesis block
-    //
-    if (mapBlockIndex.empty())
-    {
-        fTxIndex = GetBoolArg("-txindex", false);
-        pblocktree->WriteFlag("txindex", fTxIndex);
-        printf("Initializing databases...\n");
+    return true;
+}
 
-        if (fReindex)
-            return true;
 
+bool InitBlockIndex() {
+    // Check whether we're already initialized
+    if (pindexGenesisBlock != NULL)
+        return true;
+
+    // Use the provided setting for -txindex in the new database
+    fTxIndex = GetBoolArg("-txindex", false);
+    pblocktree->WriteFlag("txindex", fTxIndex);
+    printf("Initializing databases...\n");
+
+    // Only add the genesis block if not reindexing (in which case we reuse the one already on disk)
+    if (!fReindex) {
         // Genesis Block:
         // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
         //   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
@@ -2713,15 +2717,19 @@ bool LoadBlockIndex()
         assert(hash == hashGenesisBlock);
 
         // Start new block file
-        unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
-        CDiskBlockPos blockPos;
-        CValidationState state;
-        if (!FindBlockPos(state, blockPos, nBlockSize+8, 0, block.nTime))
-            return error("AcceptBlock() : FindBlockPos failed");
-        if (!block.WriteToDisk(blockPos))
-            return error("LoadBlockIndex() : writing genesis block to disk failed");
-        if (!block.AddToBlockIndex(state, blockPos))
-            return error("LoadBlockIndex() : genesis block not accepted");
+        try {
+            unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
+            CDiskBlockPos blockPos;
+            CValidationState state;
+            if (!FindBlockPos(state, blockPos, nBlockSize+8, 0, block.nTime))
+                return error("AcceptBlock() : FindBlockPos failed");
+            if (!block.WriteToDisk(blockPos))
+                return error("LoadBlockIndex() : writing genesis block to disk failed");
+            if (!block.AddToBlockIndex(state, blockPos))
+                return error("LoadBlockIndex() : genesis block not accepted");
+        } catch(std::runtime_error &e) {
+            return error("LoadBlockIndex() : failed to initialize block database: %s", e.what());
+        }
     }
 
     return true;
-- 
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