{"record":{"id":"c0c4e141fa0b47d9","repo":"nikivdev/code","slug":"failed-to-capture-stderr","errorCode":null,"errorMessage":"failed to capture stderr","messagePattern":"failed to capture stderr","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"src/storage.rs","lineNumber":398,"sourceCode":"\nfn resolve_jazz_tools_package_spec(raw: Option<&str>) -> String {\n    raw.map(str::trim)\n        .filter(|value| !value.is_empty())\n        .unwrap_or(DEFAULT_JAZZ_TOOLS_NPX_SPEC)\n        .to_string()\n}\n\nfn run_command_with_output(mut cmd: Command) -> Result<Output> {\n    let mut child = cmd.stdout(Stdio::piped()).stderr(Stdio::piped()).spawn()?;\n\n    let mut stdout = child\n        .stdout\n        .take()\n        .ok_or_else(|| anyhow::anyhow!(\"failed to capture stdout\"))?;\n    let mut stderr = child\n        .stderr\n        .take()\n        .ok_or_else(|| anyhow::anyhow!(\"failed to capture stderr\"))?;\n\n    let stdout_handle = thread::spawn(move || {\n        let mut buf = Vec::new();\n        let _ = stdout.read_to_end(&mut buf);\n        buf\n    });\n    let stderr_handle = thread::spawn(move || {\n        let mut buf = Vec::new();\n        let _ = stderr.read_to_end(&mut buf);\n        buf\n    });\n\n    let start = Instant::now();\n    let mut next_log = Duration::from_secs(10);\n    let status = loop {\n        if let Some(status) = child.try_wait()? {\n            break status;\n        }","sourceCodeStart":380,"sourceCodeEnd":416,"githubUrl":"https://github.com/nikivdev/code/blob/a747e741ae92c09071d0ae946ab48488adcff1ce/src/storage.rs#L380-L416","documentation":"Identical guard to the stdout case but for stderr: run_command_with_output pipes stderr and take()s it; if the handle is absent it throws 'failed to capture stderr'. With Stdio::piped() applied before spawn, this should never trigger.","triggerScenarios":"Calling run_command_with_output (via create_jazz_app_credentials) when the child's stderr pipe was not established — only possible if stdio configuration conflicts so child.stderr is None after spawn.","commonSituations":"Effectively unreachable in current code; would appear only after modifications that remove .stderr(Stdio::piped()) or pre-set stderr to inherit/null in the caller.","solutions":["Do not set stderr on the Command before passing it to run_command_with_output","Keep the .stderr(Stdio::piped()) call immediately before spawn()","If triggered, capture the error anyway by falling back to an empty buffer instead of failing"],"exampleFix":"// before\n.take()\n.ok_or_else(|| anyhow::anyhow!(\"failed to capture stderr\"))?;\n// after\n.take().unwrap_or_default(); // or fail with context including the command name","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match run_command_with_output(cmd) {\n    Ok(out) => out,\n    Err(e) if e.to_string().contains(\"failed to capture stderr\") => {\n        // stderr pipe missing; degrade gracefully by ignoring stderr\n        eprintln!(\"stderr unavailable: {}\", e);\n        // proceed without stderr contents\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Do not pre-set stderr on the Command at call sites","Keep .stderr(Stdio::piped()) in the helper itself","Prefer unwrap_or_default over hard error for non-critical streams"],"tags":["subprocess","stdio","defensive-code"],"backgroundTag":"missing-stdio-pipe","analyzedSha":"a747e741ae92c09071d0ae946ab48488adcff1ce","analyzedAt":"2026-09-01T22:43:55.719Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}