cmd/geth: add flag --dev.gaslimit for dev mode (#23686)

* cmd, core: add flag --dev.gaslimit to allow configuring initial block gas limit in dev mode

* core: use provided gaslimit
Co-authored-by: Martin Holst Swende <martin@swende.se>

cmd/geth/main.go

@@ -140,6 +140,7 @@ var (
 		utils.MainnetFlag,
 		utils.DeveloperFlag,
 		utils.DeveloperPeriodFlag,
+		utils.DeveloperGasLimitFlag,
 		utils.RopstenFlag,
 		utils.SepoliaFlag,
 		utils.RinkebyFlag,

cmd/geth/usage.go

@@ -75,6 +75,7 @@ var AppHelpFlagGroups = []flags.FlagGroup{
 		Flags: []cli.Flag{
 			utils.DeveloperFlag,
 			utils.DeveloperPeriodFlag,
+			utils.DeveloperGasLimitFlag,
 		},
 	},
 	{

cmd/utils/flags.go

@@ -167,6 +167,11 @@ var (
 		Name:  "dev.period",
 		Usage: "Block period to use in developer mode (0 = mine only if transaction pending)",
 	}
+	DeveloperGasLimitFlag = cli.Uint64Flag{
+		Name:  "dev.gaslimit",
+		Usage: "Initial block gas limit",
+		Value: 11500000,
+	}
 	IdentityFlag = cli.StringFlag{
 		Name:  "identity",
 		Usage: "Custom node name",
@@ -1661,7 +1666,7 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 		log.Info("Using developer account", "address", developer.Address)
 
 		// Create a new developer genesis block or reuse existing one
-		cfg.Genesis = core.DeveloperGenesisBlock(uint64(ctx.GlobalInt(DeveloperPeriodFlag.Name)), developer.Address)
+		cfg.Genesis = core.DeveloperGenesisBlock(uint64(ctx.GlobalInt(DeveloperPeriodFlag.Name)), ctx.GlobalUint64(DeveloperGasLimitFlag.Name), developer.Address)
 		if ctx.GlobalIsSet(DataDirFlag.Name) {
 			// Check if we have an already initialized chain and fall back to
 			// that if so. Otherwise we need to generate a new genesis spec.

console/console_test.go

@@ -99,7 +99,7 @@ func newTester(t *testing.T, confOverride func(*ethconfig.Config)) *tester {
 		t.Fatalf("failed to create node: %v", err)
 	}
 	ethConf := &ethconfig.Config{
-		Genesis: core.DeveloperGenesisBlock(15, common.Address{}),
+		Genesis: core.DeveloperGenesisBlock(15, 11_500_000, common.Address{}),
 		Miner: miner.Config{
 			Etherbase: common.HexToAddress(testAddress),
 		},

core/genesis.go

@@ -416,7 +416,7 @@ func DefaultSepoliaGenesisBlock() *Genesis {
 }
 
 // DeveloperGenesisBlock returns the 'geth --dev' genesis block.
-func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
+func DeveloperGenesisBlock(period uint64, gasLimit uint64, faucet common.Address) *Genesis {
 	// Override the default period to the user requested one
 	config := *params.AllCliqueProtocolChanges
 	config.Clique = &params.CliqueConfig{
@@ -428,7 +428,7 @@ func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
 	return &Genesis{
 		Config:     &config,
 		ExtraData:  append(append(make([]byte, 32), faucet[:]...), make([]byte, crypto.SignatureLength)...),
-		GasLimit:   11500000,
+		GasLimit:   gasLimit,
 		BaseFee:    big.NewInt(params.InitialBaseFee),
 		Difficulty: big.NewInt(1),
 		Alloc: map[common.Address]GenesisAccount{

miner/miner_test.go

@@ -237,7 +237,7 @@ func createMiner(t *testing.T) (*Miner, *event.TypeMux) {
 	// Create chainConfig
 	memdb := memorydb.New()
 	chainDB := rawdb.NewDatabase(memdb)
-	genesis := core.DeveloperGenesisBlock(15, common.HexToAddress("12345"))
+	genesis := core.DeveloperGenesisBlock(15, 11_500_000, common.HexToAddress("12345"))
 	chainConfig, _, err := core.SetupGenesisBlock(chainDB, genesis)
 	if err != nil {
 		t.Fatalf("can't create new chain config: %v", err)