Merge pull request #20004 from karalabe/istanbul-override

cmd, core, eth, les: support --override.istanbul

cmd/geth/config.go

@@ -20,6 +20,7 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
+	"math/big"
 	"os"
 	"reflect"
 	"unicode"
@@ -150,6 +151,9 @@ func enableWhisper(ctx *cli.Context) bool {
 
 func makeFullNode(ctx *cli.Context) *node.Node {
 	stack, cfg := makeConfigNode(ctx)
+	if ctx.GlobalIsSet(utils.OverrideIstanbulFlag.Name) {
+		cfg.Eth.OverrideIstanbul = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideIstanbulFlag.Name))
+	}
 	utils.RegisterEthService(stack, &cfg.Eth)
 
 	if ctx.GlobalBool(utils.DashboardEnabledFlag.Name) {

cmd/geth/main.go

@@ -69,6 +69,7 @@ var (
 		utils.ExternalSignerFlag,
 		utils.NoUSBFlag,
 		utils.SmartCardDaemonPathFlag,
+		utils.OverrideIstanbulFlag,
 		utils.DashboardEnabledFlag,
 		utils.DashboardAddrFlag,
 		utils.DashboardPortFlag,

cmd/utils/flags.go

@@ -223,6 +223,10 @@ var (
 		Name:  "whitelist",
 		Usage: "Comma separated block number-to-hash mappings to enforce (<number>=<hash>)",
 	}
+	OverrideIstanbulFlag = cli.Uint64Flag{
+		Name:  "override.istanbul",
+		Usage: "Manually specify Istanbul fork-block, overriding the bundled setting",
+	}
 	// Light server and client settings
 	LightLegacyServFlag = cli.IntFlag{ // Deprecated in favor of light.serve, remove in 2021
 		Name:  "lightserv",