cmd/geth: remove deprecated lightchaindata db (#30527)

This PR removes the dependencies on `lightchaindata` db as the light
protocol has been deprecated and removed from the codebase.

cmd/geth/chaincmd.go

@@ -221,8 +221,8 @@ func initGenesis(ctx *cli.Context) error {
 		v := ctx.Uint64(utils.OverrideVerkle.Name)
 		overrides.OverrideVerkle = &v
 	}
-	for _, name := range []string{"chaindata", "lightchaindata"} {
-		chaindb, err := stack.OpenDatabaseWithFreezer(name, 0, 0, ctx.String(utils.AncientFlag.Name), "", false)
+
+	chaindb, err := stack.OpenDatabaseWithFreezer("chaindata", 0, 0, ctx.String(utils.AncientFlag.Name), "", false)
 	if err != nil {
 		utils.Fatalf("Failed to open database: %v", err)
 	}
@@ -235,8 +235,9 @@ func initGenesis(ctx *cli.Context) error {
 	if err != nil {
 		utils.Fatalf("Failed to write genesis block: %v", err)
 	}
-		log.Info("Successfully wrote genesis state", "database", name, "hash", hash)
-	}
+
+	log.Info("Successfully wrote genesis state", "database", "chaindata", "hash", hash)
+
 	return nil
 }
 
@@ -258,29 +259,22 @@ func dumpGenesis(ctx *cli.Context) error {
 
 	// dump whatever already exists in the datadir
 	stack, _ := makeConfigNode(ctx)
-	for _, name := range []string{"chaindata", "lightchaindata"} {
-		db, err := stack.OpenDatabase(name, 0, 0, "", true)
+
+	db, err := stack.OpenDatabase("chaindata", 0, 0, "", true)
 	if err != nil {
-			if !os.IsNotExist(err) {
 		return err
 	}
-			continue
-		}
-		genesis, err := core.ReadGenesis(db)
+	defer db.Close()
+
+	genesis, err = core.ReadGenesis(db)
 	if err != nil {
 		utils.Fatalf("failed to read genesis: %s", err)
 	}
-		db.Close()
 
 	if err := json.NewEncoder(os.Stdout).Encode(*genesis); err != nil {
 		utils.Fatalf("could not encode stored genesis: %s", err)
 	}
-		return nil
-	}
-	if ctx.IsSet(utils.DataDirFlag.Name) {
-		utils.Fatalf("no existing datadir at %s", stack.Config().DataDir)
-	}
-	utils.Fatalf("no network preset provided, and no genesis exists in the default datadir")
+
 	return nil
 }
 
@@ -557,7 +551,7 @@ func parseDumpConfig(ctx *cli.Context, db ethdb.Database) (*state.DumpConfig, co
 	default:
 		return nil, common.Hash{}, fmt.Errorf("invalid start argument: %x. 20 or 32 hex-encoded bytes required", startArg)
 	}
-	var conf = &state.DumpConfig{
+	conf := &state.DumpConfig{
 		SkipCode:          ctx.Bool(utils.ExcludeCodeFlag.Name),
 		SkipStorage:       ctx.Bool(utils.ExcludeStorageFlag.Name),
 		OnlyWithAddresses: !ctx.Bool(utils.IncludeIncompletesFlag.Name),

cmd/utils/flags.go

@@ -2061,8 +2061,6 @@ func MakeChainDatabase(ctx *cli.Context, stack *node.Node, readonly bool) ethdb.
 			break
 		}
 		chainDb = remotedb.New(client)
-	case ctx.String(SyncModeFlag.Name) == "light":
-		chainDb, err = stack.OpenDatabase("lightchaindata", cache, handles, "", readonly)
 	default:
 		chainDb, err = stack.OpenDatabaseWithFreezer("chaindata", cache, handles, ctx.String(AncientFlag.Name), "", readonly)
 	}