cmd, core, eth, params: implement flags to control dao fork blocks

cmd/geth/main.go

@@ -150,7 +150,6 @@ participating.
 		utils.IdentityFlag,
 		utils.UnlockedAccountFlag,
 		utils.PasswordFileFlag,
-		utils.GenesisFileFlag,
 		utils.BootnodesFlag,
 		utils.DataDirFlag,
 		utils.KeyStoreDirFlag,
@@ -165,6 +164,8 @@ participating.
 		utils.MaxPendingPeersFlag,
 		utils.EtherbaseFlag,
 		utils.GasPriceFlag,
+		utils.SupportDAOFork,
+		utils.OpposeDAOFork,
 		utils.MinerThreadsFlag,
 		utils.MiningEnabledFlag,
 		utils.MiningGPUFlag,
@@ -225,12 +226,6 @@ participating.
 		eth.EnableBadBlockReporting = true
 
 		utils.SetupNetwork(ctx)
-
-		// Deprecation warning.
-		if ctx.GlobalIsSet(utils.GenesisFileFlag.Name) {
-			common.PrintDepricationWarning("--genesis is deprecated. Switch to use 'geth init /path/to/file'")
-		}
-
 		return nil
 	}
 

cmd/geth/usage.go

@@ -68,7 +68,6 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.OlympicFlag,
 			utils.TestNetFlag,
 			utils.DevModeFlag,
-			utils.GenesisFileFlag,
 			utils.IdentityFlag,
 			utils.FastSyncFlag,
 			utils.LightKDFFlag,

cmd/utils/flags.go

@@ -126,10 +126,6 @@ var (
 		Name:  "dev",
 		Usage: "Developer mode: pre-configured private network with several debugging flags",
 	}
-	GenesisFileFlag = cli.StringFlag{
-		Name:  "genesis",
-		Usage: "Insert/overwrite the genesis block (JSON format)",
-	}
 	IdentityFlag = cli.StringFlag{
 		Name:  "identity",
 		Usage: "Custom node name",
@@ -161,6 +157,15 @@ var (
 		Name:  "lightkdf",
 		Usage: "Reduce key-derivation RAM & CPU usage at some expense of KDF strength",
 	}
+	// Fork settings
+	SupportDAOFork = cli.BoolFlag{
+		Name:  "support-dao-fork",
+		Usage: "Updates the chain rules to support the DAO hard-fork",
+	}
+	OpposeDAOFork = cli.BoolFlag{
+		Name:  "oppose-dao-fork",
+		Usage: "Updates the chain rules to oppose the DAO hard-fork",
+	}
 	// Miner settings
 	// TODO: refactor CPU vs GPU mining flags
 	MiningEnabledFlag = cli.BoolFlag{
@@ -534,20 +539,6 @@ func MakeWSRpcHost(ctx *cli.Context) string {
 	return ctx.GlobalString(WSListenAddrFlag.Name)
 }
 
-// MakeGenesisBlock loads up a genesis block from an input file specified in the
-// command line, or returns the empty string if none set.
-func MakeGenesisBlock(ctx *cli.Context) string {
-	genesis := ctx.GlobalString(GenesisFileFlag.Name)
-	if genesis == "" {
-		return ""
-	}
-	data, err := ioutil.ReadFile(genesis)
-	if err != nil {
-		Fatalf("Failed to load custom genesis file: %v", err)
-	}
-	return string(data)
-}
-
 // MakeDatabaseHandles raises out the number of allowed file handles per process
 // for Geth and returns half of the allowance to assign to the database.
 func MakeDatabaseHandles() int {
@@ -689,7 +680,6 @@ func MakeSystemNode(name, version string, relconf release.Config, extra []byte,
 
 	ethConf := &eth.Config{
 		ChainConfig:             MustMakeChainConfig(ctx),
-		Genesis:                 MakeGenesisBlock(ctx),
 		FastSync:                ctx.GlobalBool(FastSyncFlag.Name),
 		BlockChainVersion:       ctx.GlobalInt(BlockchainVersionFlag.Name),
 		DatabaseCache:           ctx.GlobalInt(CacheFlag.Name),
@@ -722,17 +712,13 @@ func MakeSystemNode(name, version string, relconf release.Config, extra []byte,
 		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
 			ethConf.NetworkId = 1
 		}
-		if !ctx.GlobalIsSet(GenesisFileFlag.Name) {
 		ethConf.Genesis = core.OlympicGenesisBlock()
-		}
 
 	case ctx.GlobalBool(TestNetFlag.Name):
 		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
 			ethConf.NetworkId = 2
 		}
-		if !ctx.GlobalIsSet(GenesisFileFlag.Name) {
 		ethConf.Genesis = core.TestNetGenesisBlock()
-		}
 		state.StartingNonce = 1048576 // (2**20)
 
 	case ctx.GlobalBool(DevModeFlag.Name):
@@ -747,9 +733,7 @@ func MakeSystemNode(name, version string, relconf release.Config, extra []byte,
 			stackConf.ListenAddr = ":0"
 		}
 		// Override the Ethereum protocol configs
-		if !ctx.GlobalIsSet(GenesisFileFlag.Name) {
 		ethConf.Genesis = core.OlympicGenesisBlock()
-		}
 		if !ctx.GlobalIsSet(GasPriceFlag.Name) {
 			ethConf.GasPrice = new(big.Int)
 		}
@@ -813,24 +797,44 @@ func MustMakeChainConfig(ctx *cli.Context) *core.ChainConfig {
 
 // MustMakeChainConfigFromDb reads the chain configuration from the given database.
 func MustMakeChainConfigFromDb(ctx *cli.Context, db ethdb.Database) *core.ChainConfig {
-	genesis := core.GetBlock(db, core.GetCanonicalHash(db, 0), 0)
-
-	if genesis != nil {
-		// Existing genesis block, use stored config if available.
+	// If the chain is already initialized, use any existing chain configs
+	if genesis := core.GetBlock(db, core.GetCanonicalHash(db, 0), 0); genesis != nil {
 		storedConfig, err := core.GetChainConfig(db, genesis.Hash())
 		if err == nil {
+			// Force override any existing configs if explicitly requested
+			switch {
+			case storedConfig.DAOForkBlock == nil && ctx.GlobalBool(SupportDAOFork.Name) && ctx.GlobalBool(TestNetFlag.Name):
+				storedConfig.DAOForkBlock = params.TestNetDAOForkBlock
+			case storedConfig.DAOForkBlock == nil && ctx.GlobalBool(SupportDAOFork.Name):
+				storedConfig.DAOForkBlock = params.MainNetDAOForkBlock
+			case ctx.GlobalBool(OpposeDAOFork.Name):
+				storedConfig.DAOForkBlock = nil
+			}
 			return storedConfig
 		} else if err != core.ChainConfigNotFoundErr {
 			Fatalf("Could not make chain configuration: %v", err)
 		}
 	}
-	var homesteadBlockNo *big.Int
+	// If the chain is uninitialized nor no configs are present, create one
+	var homesteadBlock *big.Int
 	if ctx.GlobalBool(TestNetFlag.Name) {
-		homesteadBlockNo = params.TestNetHomesteadBlock
+		homesteadBlock = params.TestNetHomesteadBlock
 	} else {
-		homesteadBlockNo = params.MainNetHomesteadBlock
+		homesteadBlock = params.MainNetHomesteadBlock
+	}
+	var daoForkBlock *big.Int
+	switch {
+	case ctx.GlobalBool(SupportDAOFork.Name) && ctx.GlobalBool(TestNetFlag.Name):
+		daoForkBlock = params.TestNetDAOForkBlock
+	case ctx.GlobalBool(SupportDAOFork.Name):
+		daoForkBlock = params.MainNetDAOForkBlock
+	case ctx.GlobalBool(OpposeDAOFork.Name):
+		daoForkBlock = nil
+	}
+	return &core.ChainConfig{
+		HomesteadBlock: homesteadBlock,
+		DAOForkBlock:   daoForkBlock,
 	}
-	return &core.ChainConfig{HomesteadBlock: homesteadBlockNo}
 }
 
 // MakeChainDatabase open an LevelDB using the flags passed to the client and will hard crash if it fails.

core/config.go

@@ -31,7 +31,8 @@ var ChainConfigNotFoundErr = errors.New("ChainConfig not found") // general conf
 // that any network, identified by its genesis block, can have its own
 // set of configuration options.
 type ChainConfig struct {
-	HomesteadBlock *big.Int // homestead switch block
+	HomesteadBlock *big.Int `json:"homesteadBlock"` // homestead switch block (0 = already homestead)
+	DAOForkBlock   *big.Int `json:"daoForkBlock"`   // TheDAO hard-fork block (nil = no fork)
 
 	VmConfig vm.Config `json:"-"`
 }
@@ -41,6 +42,5 @@ func (c *ChainConfig) IsHomestead(num *big.Int) bool {
 	if num == nil {
 		return false
 	}
-
 	return num.Cmp(c.HomesteadBlock) >= 0
 }

eth/backend.go

@@ -205,6 +205,8 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	if config.ChainConfig == nil {
 		return nil, errors.New("missing chain config")
 	}
+	core.WriteChainConfig(chainDb, genesis.Hash(), config.ChainConfig)
+
 	eth.chainConfig = config.ChainConfig
 	eth.chainConfig.VmConfig = vm.Config{
 		EnableJit: config.EnableJit,

params/util.go

@@ -21,4 +21,6 @@ import "math/big"
 var (
 	TestNetHomesteadBlock = big.NewInt(494000)  // testnet homestead block
 	MainNetHomesteadBlock = big.NewInt(1150000) // mainnet homestead block
+	TestNetDAOForkBlock   = big.NewInt(8888888) // testnet dao hard-fork block
+	MainNetDAOForkBlock   = big.NewInt(9999999) // mainnet dao hard-fork block
 )