Fix GitLab auth diagnostic waking WSL

[Jinwoo-H]

Summary

• keep the global GitLab auth diagnostic on the Windows host
• prevent a missing host glab from waking the default WSL distro
• preserve the existing default-WSL fallback for GitLab operations that use normal runner behavior

Root cause and reproduction

On Windows, diagnoseAuth() runs cwd-less glab auth status. When host glab returns ENOENT, the shared runner automatically resolves the default WSL distro and retries through wsl.exe, even when the workspace and agent runtimes are Windows and GitLab is unused.

The regression harness simulates that exact subprocess sequence: Windows host glab missing, Ubuntu configured as the default distro, and the global auth command invoked. Before the fix it recorded a second wsl.exe call running glab auth status. It now asserts that the host-only diagnostic stops after the single host attempt. A separate existing test continues to cover default-WSL fallback for ordinary cwd-less GitLab API operations.

Validation

• pnpm exec vitest run --config config/vitest.config.ts src/main/git/runner-wsl-gh-fallback.test.ts src/main/gitlab/client-mr.test.ts
• pnpm exec vitest run --config config/vitest.config.ts src/main/gitlab/client-mr.test.ts src/main/gitlab/gl-utils.test.ts
• pnpm typecheck:node
• pnpm exec oxlint src/main/git/runner.ts src/main/git/runner-wsl-gh-fallback.test.ts src/main/gitlab/client.ts src/main/gitlab/client-mr.test.ts
• pnpm check:max-lines-ratchet
• git diff --check

Closes #7536

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 5b692da7-a0d8-48b0-bac5-4ebcf53639dd

📥 Commits

Reviewing files that changed from the base of the PR and between 1b0febc and 05db504.

📒 Files selected for processing (4)

• src/main/git/runner-wsl-gh-fallback.test.ts
• src/main/git/runner.ts
• src/main/gitlab/client-mr.test.ts
• src/main/gitlab/client.ts

---

📝 Walkthrough

Walkthrough

Adds an allowDefaultWslFallback option to glabExecFileAsync in the git runner, allowing callers to disable the Windows default WSL distro fallback that normally occurs when the host glab command is missing. Updates diagnoseAuth in the GitLab client to invoke glabExecFileAsync(['auth', 'status'], { allowDefaultWslFallback: false }), preventing that diagnostic call from triggering WSL fallback. Corresponding test files are updated: a new test verifies the fallback is skipped on ENOENT with the option disabled, and an existing test asserts the option is passed to the mocked call.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description covers summary, root cause, and validation, but it omits required Screenshots, AI Review Report, Security Audit, and Notes sections.	Add the missing template sections, especially Screenshots/No visual change, AI Review Report, Security Audit, and Notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly names the GitLab auth diagnostic and the WSL wakeup issue, matching the main change.
Linked Issues check	✅ Passed	The change disables default WSL fallback only for diagnoseAuth, which matches the issue's goal while preserving normal GitLab fallback behavior.
Out of Scope Changes check	✅ Passed	Changes are limited to the runner option, the GitLab auth call, and matching tests, with no unrelated scope visible.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}