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cmd/geth: add flag to set genesis #32844

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Merged
rjl493456442 merged 3 commits into from
Oct 21, 2025
Merged

cmd/geth: add flag to set genesis #32844

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b02b46d
cmd/geth: add flag to override genesis
lightclient Oct 7, 2025
caf1b2a
Update GenesisFlag usage description
rjl493456442 Oct 21, 2025
2374076
cmd: rename genesis flag to override.genesis
lightclient Oct 21, 2025
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1 change: 1 addition & 0 deletions cmd/geth/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,7 @@ var (
utils.SyncModeFlag,
utils.SyncTargetFlag,
utils.ExitWhenSyncedFlag,
utils.GenesisFlag,
utils.GCModeFlag,
utils.SnapshotFlag,
utils.TxLookupLimitFlag, // deprecated
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19 changes: 18 additions & 1 deletion cmd/utils/flags.go
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,11 @@ var (
Usage: "Exits after block synchronisation completes",
Category: flags.EthCategory,
}
GenesisFlag = &cli.StringFlag{
Name: "genesis",
Usage: "Load genesis block and configuration from file at this path",
Category: flags.EthCategory,
}

// Dump command options.
IterativeOutputFlag = &cli.BoolFlag{
Expand Down Expand Up @@ -1593,7 +1598,7 @@ func setRequiredBlocks(ctx *cli.Context, cfg *ethconfig.Config) {
// 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, don't allow network id override on preset networks
flags.CheckExclusive(ctx, MainnetFlag, DeveloperFlag, SepoliaFlag, HoleskyFlag, HoodiFlag, NetworkIdFlag)
flags.CheckExclusive(ctx, MainnetFlag, DeveloperFlag, SepoliaFlag, HoleskyFlag, HoodiFlag, NetworkIdFlag, GenesisFlag)
flags.CheckExclusive(ctx, DeveloperFlag, ExternalSignerFlag) // Can't use both ephemeral unlocked and external signer

// Set configurations from CLI flags
Expand Down Expand Up @@ -1873,6 +1878,18 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
if !ctx.IsSet(MinerGasPriceFlag.Name) {
cfg.Miner.GasPrice = big.NewInt(1)
}
case ctx.String(GenesisFlag.Name) != "":
f, err := os.Open(ctx.String(GenesisFlag.Name))
if err != nil {
Fatalf("Failed to read genesis file: %v", err)
}
defer f.Close()

genesis := new(core.Genesis)
if err := json.NewDecoder(f).Decode(genesis); err != nil {
Fatalf("Invalid genesis file: %v", err)
}
cfg.Genesis = genesis
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@rjl493456442 rjl493456442 Oct 9, 2025

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Just want to highlight that, in this case, the ChainID will be used as the NetworkID.

I guess it's expected behavior

default:
if cfg.NetworkId == 1 {
SetDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)
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