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

core/genesis.go

@@ -580,6 +580,19 @@ func DefaultSepoliaGenesisBlock() *Genesis {
 	}
 }
 
+// DefaultHoleskyGenesisBlock returns the Holesky network genesis block.
+func DefaultHoleskyGenesisBlock() *Genesis {
+	return &Genesis{
+		Config:     params.HoleskyChainConfig,
+		Nonce:      0x1234,
+		ExtraData:  hexutil.MustDecode("0x686f77206d7563682069732074686520666973683f"),
+		GasLimit:   0x17d7840,
+		Difficulty: big.NewInt(0x01),
+		Timestamp:  1694786100,
+		Alloc:      decodePrealloc(holeskyAllocData),
+	}
+}
+
 // DeveloperGenesisBlock returns the 'geth --dev' genesis block.
 func DeveloperGenesisBlock(gasLimit uint64, faucet common.Address) *Genesis {
 	// Override the default period to the user requested one
@@ -607,13 +620,34 @@ func DeveloperGenesisBlock(gasLimit uint64, faucet common.Address) *Genesis {
 }
 
 func decodePrealloc(data string) GenesisAlloc {
-	var p []struct{ Addr, Balance *big.Int }
+	var p []struct {
+		Addr    *big.Int
+		Balance *big.Int
+		Misc    *struct {
+			Nonce uint64
+			Code  []byte
+			Slots []struct {
+				Key common.Hash
+				Val common.Hash
+			}
+		} `rlp:"optional"`
+	}
 	if err := rlp.NewStream(strings.NewReader(data), 0).Decode(&p); err != nil {
 		panic(err)
 	}
 	ga := make(GenesisAlloc, len(p))
 	for _, account := range p {
-		ga[common.BigToAddress(account.Addr)] = GenesisAccount{Balance: account.Balance}
+		acc := GenesisAccount{Balance: account.Balance}
+		if account.Misc != nil {
+			acc.Nonce = account.Misc.Nonce
+			acc.Code = account.Misc.Code
+
+			acc.Storage = make(map[common.Hash]common.Hash)
+			for _, slot := range account.Misc.Slots {
+				acc.Storage[slot.Key] = slot.Val
+			}
+		}
+		ga[common.BigToAddress(account.Addr)] = acc
 	}
 	return ga
 }

core/mkalloc.go

@@ -32,24 +32,51 @@ import (
 	"os"
 	"strconv"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/rlp"
 	"golang.org/x/exp/slices"
 )
 
-type allocItem struct{ Addr, Balance *big.Int }
+type allocItem struct {
+	Addr    *big.Int
+	Balance *big.Int
+	Misc    *allocItemMisc `rlp:"optional"`
+}
+
+type allocItemMisc struct {
+	Nonce uint64
+	Code  []byte
+	Slots []allocItemStorageItem
+}
+
+type allocItemStorageItem struct {
+	Key common.Hash
+	Val common.Hash
+}
 
 func makelist(g *core.Genesis) []allocItem {
 	items := make([]allocItem, 0, len(g.Alloc))
 	for addr, account := range g.Alloc {
+		var misc *allocItemMisc
 		if len(account.Storage) > 0 || len(account.Code) > 0 || account.Nonce != 0 {
-			panic(fmt.Sprintf("can't encode account %x", addr))
+			misc = &allocItemMisc{
+				Nonce: account.Nonce,
+				Code:  account.Code,
+				Slots: make([]allocItemStorageItem, 0, len(account.Storage)),
+			}
+			for key, val := range account.Storage {
+				misc.Slots = append(misc.Slots, allocItemStorageItem{key, val})
+			}
+			slices.SortFunc(misc.Slots, func(a, b allocItemStorageItem) int {
+				return a.Key.Cmp(b.Key)
+			})
 		}
 		bigAddr := new(big.Int).SetBytes(addr.Bytes())
-		items = append(items, allocItem{bigAddr, account.Balance})
+		items = append(items, allocItem{bigAddr, account.Balance, misc})
 	}
-	slices.SortFunc(items, func(a, b allocItem) bool {
-		return a.Addr.Cmp(b.Addr) < 0
+	slices.SortFunc(items, func(a, b allocItem) int {
+		return a.Addr.Cmp(b.Addr)
 	})
 	return items
 }