fix cached self entries fsspec

[Light2Dark]

📝 Summary

Some fsspec backends can return the queried directory itself as a child entry when listings are from a stale parent cache.

Backend
We check if there is an exact match & only 1 returned result when doing ls. If yes, invalidate cache, and try ls again.

The logic is intentionally simple to catch the simplest case, I've not seen more complex cases of this.

Frontend
Updated the generated GoogleDriveFileSystem(...) snippet to include use_listings_cache=False, which wouldn't cause this issue in the first place.

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• Tests have been added for the changes made.
• Documentation has been updated where applicable, including docstrings for API changes.
• Pull request title is a good summary of the changes - it will be used in the release notes.

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Mar 25, 2026 6:00am

[codecov]

Bundle Report

Changes will increase total bundle size by 52 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
marimo-esm	25.59MB	52 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: marimo-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/add-*.js	52 bytes	55.39kB	0.09%

Files in assets/add-*.js:

• ./src/components/editor/connections/storage/as-code.ts → Total Size: 4.97kB

[Copilot]

Pull request overview

Addresses an edge case in fsspec directory listings where some backends can return the queried directory itself as a child entry (often due to stale listing caches), which can cause recursive “folder contains itself” trees in the storage inspector UI.

Changes:

• Backend: detect self-entry echoes in FsspecFilesystem.list_entries, invalidate relevant fsspec dircache keys, retry once, and finally filter exact self-entries.
• Tests: add coverage for the retry-on-self-entry and exact-self-entry filtering behavior.
• Frontend: update generated GoogleDriveFileSystem(...) snippet to set use_listings_cache=False.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tests/_data/_external_storage/test_storage_models.py	Adds tests for retrying and filtering when a self-entry is returned by ls().
marimo/_data/_external_storage/storage.py	Implements self-entry detection, cache invalidation + retry, and final filtering for fsspec listings.
frontend/src/components/editor/connections/storage/as-code.ts	Updates generated Google Drive connection code to disable listing cache.
frontend/src/components/editor/connections/storage/tests/snapshots/as-code.test.ts.snap	Updates snapshots to reflect the new generated Google Drive code.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.21.2-dev55