cmd, core, params: add support for the Holesky testnet (#28007)

* cmd, core, params: add support for the Holesky testnet

* cmd/devp2p: add support for holesky for the dns crawler

cmd/utils/flags.go

@@ -136,7 +136,7 @@ var (
 	}
 	NetworkIdFlag = &cli.Uint64Flag{
 		Name:     "networkid",
-		Usage:    "Explicitly set network id (integer)(For testnets: use --goerli, --sepolia instead)",
+		Usage:    "Explicitly set network id (integer)(For testnets: use --goerli, --sepolia, --holesky instead)",
 		Value:    ethconfig.Defaults.NetworkId,
 		Category: flags.EthCategory,
 	}
@@ -155,7 +155,11 @@ var (
 		Usage:    "Sepolia network: pre-configured proof-of-work test network",
 		Category: flags.EthCategory,
 	}
-
+	HoleskyFlag = &cli.BoolFlag{
+		Name:     "holesky",
+		Usage:    "Holesky network: pre-configured proof-of-stake test network",
+		Category: flags.EthCategory,
+	}
 	// Dev mode
 	DeveloperFlag = &cli.BoolFlag{
 		Name:     "dev",
@@ -952,6 +956,7 @@ var (
 	TestnetFlags = []cli.Flag{
 		GoerliFlag,
 		SepoliaFlag,
+		HoleskyFlag,
 	}
 	// NetworkFlags is the flag group of all built-in supported networks.
 	NetworkFlags = append([]cli.Flag{MainnetFlag}, TestnetFlags...)
@@ -982,6 +987,9 @@ func MakeDataDir(ctx *cli.Context) string {
 		if ctx.Bool(SepoliaFlag.Name) {
 			return filepath.Join(path, "sepolia")
 		}
+		if ctx.Bool(HoleskyFlag.Name) {
+			return filepath.Join(path, "holesky")
+		}
 		return path
 	}
 	Fatalf("Cannot determine default data directory, please set manually (--datadir)")
@@ -1028,6 +1036,8 @@ func setBootstrapNodes(ctx *cli.Context, cfg *p2p.Config) {
 	switch {
 	case ctx.IsSet(BootnodesFlag.Name):
 		urls = SplitAndTrim(ctx.String(BootnodesFlag.Name))
+	case ctx.Bool(HoleskyFlag.Name):
+		urls = params.HoleskyBootnodes
 	case ctx.Bool(SepoliaFlag.Name):
 		urls = params.SepoliaBootnodes
 	case ctx.Bool(GoerliFlag.Name):
@@ -1480,6 +1490,8 @@ func SetDataDir(ctx *cli.Context, cfg *node.Config) {
 		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "goerli")
 	case ctx.Bool(SepoliaFlag.Name) && cfg.DataDir == node.DefaultDataDir():
 		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "sepolia")
+	case ctx.Bool(HoleskyFlag.Name) && cfg.DataDir == node.DefaultDataDir():
+		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "holesky")
 	}
 }
 
@@ -1636,7 +1648,7 @@ func CheckExclusive(ctx *cli.Context, args ...interface{}) {
 // SetEthConfig applies eth-related command line flags to the config.
 func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 	// Avoid conflicting network flags
-	CheckExclusive(ctx, MainnetFlag, DeveloperFlag, GoerliFlag, SepoliaFlag)
+	CheckExclusive(ctx, MainnetFlag, DeveloperFlag, GoerliFlag, SepoliaFlag, HoleskyFlag)
 	CheckExclusive(ctx, LightServeFlag, SyncModeFlag, "light")
 	CheckExclusive(ctx, DeveloperFlag, ExternalSignerFlag) // Can't use both ephemeral unlocked and external signer
 
@@ -1789,6 +1801,12 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 		}
 		cfg.Genesis = core.DefaultGenesisBlock()
 		SetDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)
+	case ctx.Bool(HoleskyFlag.Name):
+		if !ctx.IsSet(NetworkIdFlag.Name) {
+			cfg.NetworkId = 17000
+		}
+		cfg.Genesis = core.DefaultHoleskyGenesisBlock()
+		SetDNSDiscoveryDefaults(cfg, params.HoleskyGenesisHash)
 	case ctx.Bool(SepoliaFlag.Name):
 		if !ctx.IsSet(NetworkIdFlag.Name) {
 			cfg.NetworkId = 11155111
@@ -2121,6 +2139,8 @@ func MakeGenesis(ctx *cli.Context) *core.Genesis {
 	switch {
 	case ctx.Bool(MainnetFlag.Name):
 		genesis = core.DefaultGenesisBlock()
+	case ctx.Bool(HoleskyFlag.Name):
+		genesis = core.DefaultHoleskyGenesisBlock()
 	case ctx.Bool(SepoliaFlag.Name):
 		genesis = core.DefaultSepoliaGenesisBlock()
 	case ctx.Bool(GoerliFlag.Name):