Fix MIME types for path-backed feedback attachments - #30796
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Codex Review: Didn't find any major issues. Bravo. Reviewed commit: ℹ️ About Codex in GitHubCodex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you
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btraut-openai
marked this pull request as ready for review
July 1, 2026 06:18
etraut-openai
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Jul 3, 2026
etraut-openai
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Code looks good. I also had codex run a manual test, and I confirmed (by using Sentry) that the file type and MIME types were correct.
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Why
Path-backed feedback attachments were always labeled
text/plain, even when the attached file was a gzip archive. Sentry consumers could therefore UTF-8-decode a valid Codex Desktop log bundle and corrupt the transferred bytes before anyone inspected it. Desktop already creates a valid archive and sends its path throughfeedback/upload; the bad metadata was assigned later by app-server's feedback upload path.Slack investigation: https://openai.slack.com/archives/C09NZ54M4KY/p1782867266569699
What changed
Path-backed feedback attachments now derive their MIME type from the final uploaded filename. Gzip files use
application/gzip, known text formats remain text, and unrecognized files use the safeapplication/octet-streamfallback. Attachment filenames and bytes are unchanged.How it works
.jsonlrollouts remaintext/plain, while other known formats use the repository's existingmime_guessmapping.application/octet-streaminstead of being treated as UTF-8 text.feedback/uploadstill accepts the same path list, so Desktop, generated protocol surfaces, and remote-host minimums do not change.Verification
Added focused coverage for gzip MIME, unknown binary fallback,
.jsonltext handling, and exact filename/byte preservation. Ran the completecodex-feedbacktest suite (9 tests), crate-scoped Clippy, Rust formatting, Bazel lock refresh, and diff checks successfully.