{"record":{"id":"665b011910203da4","repo":"DioxusLabs/dioxus","slug":"failed-to-write-rustc-args-to-file","errorCode":null,"errorMessage":"Failed to write rustc args to file","messagePattern":"Failed to write rustc args to file","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/cli/src/rustcwrapper.rs","lineNumber":135,"sourceCode":"                .map(|s| s.as_str());\n\n            let serialized_args =\n                serde_json::to_string(rustc_args).expect(\"Failed to serialize rustc args\");\n\n            // Write args with an explicit target suffix: {crate_name}.lib.json or\n            // {crate_name}.bin.json. This avoids the ambiguity of a bare {crate_name}.json\n            // and ensures lib+bin crates don't overwrite each other.\n            let suffix = match crate_type {\n                Some(\"lib\" | \"rlib\") => \"lib\",\n                Some(\"bin\") => \"bin\",\n                _ => \"bin\", // proc-macro, cdylib, etc. — treat as bin\n            };\n\n            std::fs::write(\n                args_dir.join(format!(\"{crate_name}.{suffix}.json\")),\n                &serialized_args,\n            )\n            .expect(\"Failed to write rustc args to file\");\n        }\n    }\n}\n\n/// Check if the arguments indicate a linking step, including those in command files.\nfn has_linking_args() -> bool {\n    for arg in std::env::args() {\n        // Direct check for linker-like arguments\n        if arg.ends_with(\".o\") || arg == \"-flavor\" {\n            return true;\n        }\n\n        // Check inside command files\n        if let Some(path_str) = arg.strip_prefix('@') {\n            if let Ok(file_binary) = std::fs::read(path_str) {\n                // Handle both UTF-8 and UTF-16LE encodings for response files.\n                let content = String::from_utf8(file_binary.clone()).unwrap_or_else(|_| {\n                    let binary_u16le: Vec<u16> = file_binary","sourceCodeStart":117,"sourceCodeEnd":153,"githubUrl":"https://github.com/DioxusLabs/dioxus/blob/393d190a801ccb441d41923e232289b4f8a5c669/packages/cli/src/rustcwrapper.rs#L117-L153","documentation":"Final step of the rustc wrapper's arg capture: writing the serialized args to {crate_name}.{lib|bin}.json fails at the fs::write level after the directory already exists - disk full, permission denied on the file, or an OS-level path problem.","triggerScenarios":"ENOSPC/quota exhaustion during a dx build; a same-named args file owned by another user from a concurrent build; path-length limits on Windows with deep target dirs and long crate names.","commonSituations":"CI runners with small ephemeral disks; two dx builds sharing one target dir under different users; very deep project paths on Windows.","solutions":["Free disk space or raise the quota, then rebuild","Delete the dioxus rustc-args directory under target and retry so files are recreated cleanly","Set CARGO_TARGET_DIR to a short path (e.g. C:\\\\dx\\\\target) to dodge Windows path-length limits","Don't share one target dir between dx instances running as different users"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["Monitor disk space during long dx sessions; the wrapper writes one JSON per crate","Use a short CARGO_TARGET_DIR on Windows to avoid path-length failures","Don't share one target dir between dx instances running as different users"],"tags":["cli","rustc-wrapper","io","disk-full","build"],"backgroundTag":null,"analyzedSha":"393d190a801ccb441d41923e232289b4f8a5c669","analyzedAt":"2026-08-16T11:27:45.815Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}