Document vm.derive

[onbjerg]

See foundry-rs/foundry#2299

[Elyx0]

Am I missing something about the usage?

source .env && forge script script/EOADeploy.s.sol:Deploy --fork-url http://localhost:8545 --broadcast

        uint256 deployerPrivateKey = vm.deriveKey(vm.envString("TESTNET_MNEMONIC"), 0);
 
        vm.startBroadcast(vm.addr(deployerPrivateKey));

Finding wallets for all the necessary addresses...

Transactions saved to: broadcast/EOADeploy.s.sol/80001/run-latest.json

Error:
No associated wallet for addresses: {0x1ba0f96b...4938cf70}. Unlocked wallets: []
error Command failed with exit code 1.

[onbjerg]

You still need to pass in the mnemonic separately to forge script so it knows the private key of the wallet when it has to sign transactions

[Elyx0]

It kinda defeats the purpose of self-aware scripting from env

[onbjerg]

This is not the place to discuss the feature itself, this is only for docs

[devanoneth]

@Elyx0 have you started discussing it somewhere else? FYI, I am also working on a remember cheatcode which will allow you to actually add the private key to Foundry's wallet. I have not had the chance to finish it yet, but once I do I'll update docs to explain the intended usage.

[devanoneth]

@Elyx0 rememberKey landed in foundry-rs/foundry#3047. I'll have docs in the book soon but you can play around with it once the next nightly lands in about 2 hours.