{"record":{"id":"4c04d7f9d5ed7da7","repo":"GitoxideLabs/gitoxide","slug":"ran-out-of-bytes-before-reading-desired-amount-of","errorCode":null,"errorMessage":"ran out of bytes before reading desired amount of bytes","messagePattern":"ran out of bytes before reading desired amount of bytes","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gix-pack/src/cache/delta/from_offsets.rs","lineNumber":151,"sourceCode":"        r: &mut io::BufReader<fs::File>,\n        pack_offset: u64,\n        previous_offset: u64,\n    ) -> Result<(), Error> {\n        let bytes_to_skip: u64 = pack_offset\n            .checked_sub(previous_offset)\n            .expect(\"continuously ascending pack offsets\");\n        if bytes_to_skip == 0 {\n            return Ok(());\n        }\n        let buf = r.fill_buf().map_err(|err| Error::Io {\n            source: err,\n            message: \"skip bytes\",\n        })?;\n        if buf.is_empty() {\n            // This means we have reached the end of file and can't make progress anymore, before we have satisfied our need\n            // for more\n            return Err(Error::Io {\n                source: io::Error::new(\n                    io::ErrorKind::UnexpectedEof,\n                    \"ran out of bytes before reading desired amount of bytes\",\n                ),\n                message: \"index file is damaged or corrupt\",\n            });\n        }\n        if bytes_to_skip <= u64::try_from(buf.len()).expect(\"sensible buffer size\") {\n            // SAFETY: bytes_to_skip <= buf.len() <= usize::MAX\n            r.consume(bytes_to_skip as usize);\n        } else {\n            r.seek(SeekFrom::Start(pack_offset)).map_err(|err| Error::Io {\n                source: err,\n                message: \"seek to next entry\",\n            })?;\n        }\n        Ok(())\n    }\n}","sourceCodeStart":133,"sourceCodeEnd":169,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-pack/src/cache/delta/from_offsets.rs#L133-L169","documentation":"This io::Error (UnexpectedEof) is raised when, while skipping bytes in a pack data stream, the underlying reader hits end-of-file before the requested number of bytes could be skipped. The library wraps it with the message 'index file is damaged or corrupt', so it signals a truncated or otherwise corrupt pack/index file rather than a normal EOF. It surfaces as Error::Io from pack reading operations.","triggerScenarios":"Calling pack reading APIs (e.g. decode via cache/delta FromOffsets iterator) when the pack file or index is truncated mid-entry: the reader attempts to skip compressed data but the file ends first.","commonSituations":"Interrupted clone/fetch leaving a truncated .pack/.idx file, disk-full during pack write, manually copied incomplete pack files, corrupted filesystem storage.","solutions":["Verify pack/index integrity with `gix pack verify` or `git fsck` and re-fetch the repository","Delete the truncated .pack/.idx pair and re-clone or re-fetch to regenerate them","Check disk space and filesystem health where the repository is stored","If reading from a custom reader, ensure it supplies the full pack data without premature EOF"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// before reading\nlet meta = std::fs::metadata(&pack_path).map_err(|e| e.to_string())?;\nif meta.len() < expected_min_pack_size { return Err(\"pack truncated\".into()); }\n// optionally: match pack checksum verification up front","typeGuard":null,"tryCatchPattern":"match res {\n    Err(e) if e.to_string().contains(\"ran out of bytes\") => {\n        // re-clone / re-fetch the repository, pack is truncated\n    }\n    other => other?,\n}","preventionTips":["Verify packs after transfer with `gix pack verify`","Never copy .pack/.idx files mid-write; use atomic rename","Monitor disk space on repositories receiving fetches"],"tags":["pack","corruption","eof","git"],"backgroundTag":"file-read-failed","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}