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Debugging Foundry tools

This is a working document intended to outline some commands contributors can use to debug various parts of Foundry.

Logs

All crates use tracing for logging. An console formatter is installed in each binary (cast, forge, anvil).

By setting RUST_LOG=<filter> you can get a lot more info out of Forge and Cast. For example, running Forge with RUST_LOG=forge will emit all logs of the cli crate, same for Cast.

The most basic valid filter is a log level, of which these are valid:

  • error
  • warn
  • info
  • debug
  • trace

Filters are explained in detail in the env_logger crate docs.

Compiler input and output

You can get the compiler input JSON and output JSON from ethers-solc by passing the --build-info flag. This will create two files: one for the input and one for the output.