local geth --dev network with shanghai evm support

[q9f]

Rationale

Why should this feature exist?

• Tooling expects a Shanghai EVM target
• Mainnet and all testnets feature a Shanghai EVM target
• However, the local devnets based on Clique/Ethash cannot easily support Shanghai

What are the use-cases?

• Run code and test applications targeting Shanghai on a local devnet
• Use Geth to run tests targeting Shanghai in CI

Implementation

Do you have ideas regarding the implementation of this feature?

• Either create a FakeShanghai config that does not include withdrawals that can be applied to non-beacon consensus engine
• Or create a FakeBeacon consensus that allows us to run a local devnet with beacon consensus (and Shanghai)

Are you willing to implement this feature?

• Honestly, I think this would be a good first issue. Not sure, I'm the one though! 😊
• ref params: default to shanghai evm version on local dev nets #27360

[s1na]

Jared is working on a dev mode that is post-merge and uses the engine API #27327 for block building.

[antazoey]

ah ok, I believe I am also hitting this... I am getting invalid opcode PUSH0 when I compile with shanghai (using vyper)

[q9f]

ah ok, I believe I am also hitting this... I am getting invalid opcode PUSH0 when I compile with shanghai (using vyper)

Yes, exactly.

[holiman]

Done, with #27327

[antazoey]

Is there a way to have this work when not using the --dev option (like for custom dev networks)?

[s1na]

@antazoey In your place I'd look at Kurtosis. They make it easy to spin up PoS testnets.

[rmlearney-digicatapult]

@s1na What if our network needs to be PoA?

[antazoey]

I am having better luck these days with PoA... The thing I was missing was setting "shanghaiTime": 0 in my genesis config.