Friendship Quest remix of mobius, a hotline server in go #cli https://git.r.bdr.sh/mobius/atom/docs/r2-file-store.md?h=main 2026-07-08T22:01:05Z 2026-07-08T22:01:05Z Jeff Halter 868228+jhalter@users.noreply.github.com 2026-07-08T22:01:05Z urn:sha1:4bd4c14daff4cb8807a91305239cae1e8544f276 Implement R2FileStore, a FileStore backed by Cloudflare R2 via its S3-compatible API, selectable with --file-store r2 and configured through R2_* environment variables. The store follows the MemFileStore model: a flat keyspace where directories are derived from key prefixes, with zero-byte marker objects so empty folders persist, and errors.ErrUnsupported for symlink/alias operations. Because R2 has no append, in-progress .incomplete uploads are routed to a local staging directory (real O_APPEND and size-based resume) and promoted to a finished R2 object on the terminal upload-commit Rename; all other paths live in R2. A narrow s3API seam plus an s3Uploader interface make the backend unit-testable against an in-memory fake without a network. Adds a user setup guide at docs/r2-file-store.md.