Better Hardfork -> evm SpecId handling for L2s

[mattsse]

Component

Anvil

Describe the feature you would like

currently the Hardfork to specid conversion is only handled properly for mainnet

foundry/crates/anvil/src/config.rs

Line 805 in 6432031

cfg.spec_id = self.get_hardfork().into();

if no hardfork argument is provided:

foundry/crates/anvil/src/config.rs

Lines 940 to 941 in 6432031

	if chain_id == ethers::types::Chain::Mainnet.into() {
	let hardfork: Hardfork = fork_block_number.into();

we can make this smarter if we have hardfork/specid heights for L2s

TODO

gather hardfork to evm specid blockheights for commonly used L2s/networks

• polygon
• OP
• Arbitrum
• ...

Additional context

No response

[MuhtasimTanmoy]

Is this active?

[zerosnacks]

I think this issue has not been resolved yet

foundry/crates/anvil/src/config.rs

Lines 1047 to 1051 in 642f13f

	if alloy_chains::NamedChain::Mainnet == chain_id {
	let hardfork: Hardfork = fork_block_number.into();
	env.handler_cfg.spec_id = hardfork.into();
	self.hardfork = Some(hardfork);
	}

Users are however, as stated, able to specify the hardfork

foundry/crates/anvil/src/config.rs

Lines 592 to 597 in 642f13f

	/// Sets the hardfork
	#[must_use]
	pub fn with_hardfork(mut self, hardfork: Option<Hardfork>) -> Self {
	self.hardfork = hardfork;
	self
	}

[zerosnacks]

@mattsse

Optimism recently contributed the specifying of their hardforks here: #8749

Is this sufficient or should we consider a more generalized solution