Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (25cc1ac 2024-11-21T00:22:12.782328000Z)

What command(s) is the bug in?

forge test

Operating System

Linux

Describe the bug

TLDR minimal reproduction here

I commented on this in another issue yesterday.

We started seeing CI builds break for flex-voting (as well as other internal projects) a few days ago. The errors happened during the forge test step:

Run forge test
2024-11-19T15:32:25.463715Z ERROR foundry_compilers_artifacts_solc::sources: error="/home/runner/work/flexible-voting/flexible-voting/lib/openzeppelin-contracts/contracts/utils/math/SafeCast.sol": No such file or directory (os error 2)
Error: failed to resolve file: "/home/runner/work/flexible-voting/flexible-voting/lib/openzeppelin-contracts/contracts/utils/math/SafeCast.sol": No such file or directory (os error 2); check configured remappings
	--> /home/runner/work/flexible-voting/flexible-voting/src/FlexVotingClient.sol
	@openzeppelin/contracts/utils/math/SafeCast.sol

Weirdly, we were never able to reproduce this locally. However, we resolved it in CI by pinning foundry to e649e62 in our workflow yaml, as seen here.

This morning we tried to reproduce the issue in a clean repo. We found that the issue requires:

• forge installing a library like OZ
• adding a remapping for that repo in foundry.toml
• using the remapping in a file compiled/run for testing

If the remapping is removed from the foundry.toml the issue is fixed -- forge test is able to run again in CI.

Open questions at this point:

1. How is the code able to compile if there are no remappings? import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol"; should not compile without a remapping, but it does.
2. Why are the remappings breaking CI?
3. What changed in foundry to cause this to happen? Nothing obvious stands out in the diff.

Thanks for your help!