{"record":{"id":"eb636efd7e420377","repo":"GitoxideLabs/gitoxide","slug":"tree-extension-exceeds-4gb","errorCode":null,"errorMessage":"tree extension exceeds 4GB","messagePattern":"tree extension exceeds 4GB","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gix-index/src/extension/tree/write.rs","lineNumber":43,"sourceCode":"            }\n\n            for child in &tree.children {\n                tree_entry(out, child, buf)?;\n            }\n\n            Ok(())\n        }\n\n        let signature = tree::SIGNATURE;\n\n        let mut entries = Vec::<u8>::new();\n        let mut num_buf = itoa::Buffer::new();\n        tree_entry(&mut entries, self, &mut num_buf)?;\n\n        out.write_all(&signature)?;\n        out.write_all(\n            &u32::try_from(entries.len())\n                .map_err(|_| std::io::Error::new(std::io::ErrorKind::InvalidData, \"tree extension exceeds 4GB\"))?\n                .to_be_bytes(),\n        )?;\n        out.write_all(&entries)?;\n\n        Ok(())\n    }\n}\n","sourceCodeStart":25,"sourceCodeEnd":51,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-index/src/extension/tree/write.rs#L25-L51","documentation":"The git index TREE extension writer (`write_to` in gix-index) stores the total serialized length as a big-endian `u32`. If the accumulated entry bytes exceed `u32::MAX` (~4GB), `u32::try_from` fails and the writer returns `InvalidData` rather than emitting a structurally invalid index file.","triggerScenarios":"Calling index writing with a TREE extension whose serialized entry data exceeds 4GB — an enormous repository with a gigantic tree extension.","commonSituations":"Monorepo-scale checkouts being rewritten by gix-based tooling; fuzz tests generating pathological index data; a bug duplicating entries during extension construction.","solutions":["Reduce the size of the index/TREE extension data being written (fewer/smaller entries).","Verify entry construction for accidental duplication that inflates `entries.len()`.","File/track an upstream limitation — the git index format itself caps this field at u32."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match gix_index::extension::tree::write_to(&tree, &mut out) {\n    Err(e) if e.to_string().contains(\"exceeds 4GB\") => /* handle oversize index gracefully */,\n    other => /* continue */,\n}","preventionTips":["Watch index size for monorepo-scale repositories.","Validate TREE extension construction to avoid duplicated entries.","Treat the 4GB cap as a hard limit of the git index format."],"tags":["git","index","limit","rust"],"backgroundTag":"file-size-limit-exceeded","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-16T04:17:20.429Z"}