cmd/utils, core, params: explicitly pick reprice fork for fast sync

2 files changed, 12 insertions, 2 deletions

diff --git a/core/block_validator.go b/core/block_validator.go
index e5bc6178b..3f5aa10ff 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -248,7 +248,15 @@ func ValidateHeader(config *ChainConfig, pow pow.PoW, header *types.Header, pare
 		}
 	}
 	// If all checks passed, validate the extra-data field for hard forks
-	return ValidateDAOHeaderExtraData(config, header)
+	if err := ValidateDAOHeaderExtraData(config, header); err != nil {
+		return err
+	}
+	if config.HomesteadGasRepriceBlock != nil && config.HomesteadGasRepriceBlock.Cmp(header.Number) == 0 {
+		if config.HomesteadGasRepriceHash != (common.Hash{}) && config.HomesteadGasRepriceHash != header.Hash() {
+			return ValidationError("Homestead gas reprice fork hash mismatch: have 0x%x, want 0x%x", header.Hash(), config.HomesteadGasRepriceBlock)
+		}
+	}
+	return nil
 }
 
 // CalcDifficulty is the difficulty adjustment algorithm. It returns
diff --git a/core/config.go b/core/config.go
index 3ab04e520..96e39ea3c 100644
--- a/core/config.go
+++ b/core/config.go
@@ -20,6 +20,7 @@ import (
 	"errors"
 	"math/big"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/params"
 )
@@ -36,7 +37,8 @@ type ChainConfig struct {
 	DAOForkBlock   *big.Int `json:"daoForkBlock"`   // TheDAO hard-fork switch block (nil = no fork)
 	DAOForkSupport bool     `json:"daoForkSupport"` // Whether the nodes supports or opposes the DAO hard-fork
 
-	HomesteadGasRepriceBlock *big.Int `json:"homesteadGasRepriceBlock"` // Homestead gas reprice switch block (nil = no fork)
+	HomesteadGasRepriceBlock *big.Int    `json:"homesteadGasRepriceBlock"` // Homestead gas reprice switch block (nil = no fork)
+	HomesteadGasRepriceHash  common.Hash `json:"homesteadGasRepriceHash"`  // Homestead gas reprice switch block hash (fast sync aid)
 
 	VmConfig vm.Config `json:"-"`
 }