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cmd/geth: add flag to set genesis (#32844)

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This PR is an alternative to #32556.

Instead of trying to be smart and reuse `geth init`, we can introduce a
new flag `--genesis` that loads the `genesis.json` from file into the
`Genesis` object in the same path that the other network flags currently
work in.

Question: is something like `--genesis` enough to start deprecating
`geth init`?

--

```console
$ geth --datadir data --hoodi
..
INFO [10-06|22:37:11.202]  - BPO2:                        @1762955544
..
$ geth --datadir data --genesis genesis.json
..
INFO [10-06|22:37:27.988]  - BPO2:                       @1862955544
..
```

Pull the genesis [from the
specs](https://raw.githubusercontent.com/eth-clients/hoodi/refs/heads/main/metadata/genesis.json)
and modify one of the BPO timestamps to simulate a shadow fork.

---------

Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
This commit is contained in:
lightclient 2025-10-21 08:10:45 -06:00 committed by root
parent f61df31e1f
commit 827a60e9f8
2 changed files with 19 additions and 1 deletions
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1
cmd/geth/main.go
View file

@ -66,6 +66,7 @@ var (
utils.OverrideBPO1,
utils.OverrideBPO2,
utils.OverrideVerkle,
utils.OverrideGenesisFlag,
utils.EnablePersonal, // deprecated
utils.TxPoolLocalsFlag,
utils.TxPoolNoLocalsFlag,

19
cmd/utils/flags.go
View file

@ -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")`,
@ -1613,7 +1618,7 @@ 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
@ -1899,6 +1904,18 @@ 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
default:
if cfg.NetworkId == 1 {
SetDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)