Skip to content

cmd/geth: add flag to set genesis #32844

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Oct 21, 2025
Merged

cmd/geth: add flag to set genesis #32844

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
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
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions cmd/geth/main.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@ var (
utils.OverrideBPO1,
utils.OverrideBPO2,
utils.OverrideVerkle,
utils.OverrideGenesisFlag,
utils.EnablePersonal, // deprecated
utils.TxPoolLocalsFlag,
utils.TxPoolNoLocalsFlag,
Expand Down
19 changes: 18 additions & 1 deletion cmd/utils/flags.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -262,6 +262,11 @@ var (
Usage: "Manually specify the Verkle fork timestamp, overriding the bundled setting",
Category: flags.EthCategory,
}
OverrideGenesisFlag = &cli.StringFlag{
Name: "override.genesis",
Usage: "Load genesis block and configuration from file at this path",
Category: flags.EthCategory,
}
SyncModeFlag = &cli.StringFlag{
Name: "syncmode",
Usage: `Blockchain sync mode ("snap" or "full")`,
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, OverrideGenesisFlag)
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(OverrideGenesisFlag.Name) != "":
f, err := os.Open(ctx.String(OverrideGenesisFlag.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
Copy link
Member

@rjl493456442 rjl493456442 Oct 9, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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)
Expand Down