fix: handle EEXIST in mkdir for OneDrive-synced .git/info on Windows

[0xSkybreaker]

@

Summary

Fixes #721 — MiMo Code crashes on startup in OneDrive-synced Git repositories on Windows because mkdir(".git/info", { recursive: true }) throws EEXIST when the directory has the ReadOnly NTFS attribute.

Root Cause

This is a known libuv/Node.js issue (nodejs#43994): on Windows, mkdir with { recursive: true } throws EEXIST when the target directory already exists and has the ReadOnly attribute. OneDrive sets this attribute on synced folders by default.

Changes

packages/opencode/src/project/project.ts — Catch and suppress EEXIST in setupProjectIdEnvironment when creating .git/info:

await nodeFs
  .mkdir(nodePath.dirname(excludeFile), { recursive: true })
  .catch((e: any) => {
    if (e?.code !== "EEXIST") throw e
  })

Impact

Before this fix, MiMo Code was completely unusable on Windows with OneDrive-synced projects — it crashed before the TUI loaded. This affects a large portion of Windows users since OneDrive is the default sync for Documents/Desktop on Windows 10/11.

Reproduction (before fix)

attrib +R ".git\info"
mimo  # crashes with EEXIST: file already exists, mkdir .gitinfo

🤖 Generated with Claude Code@