{"record":{"id":"08e33b7b90cebc01","repo":"Morganamilo/paru","slug":"failed-to-spawn-auth-process","errorCode":null,"errorMessage":"failed to spawn auth process","messagePattern":"failed to spawn auth process","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"src/auth.rs","lineNumber":35,"sourceCode":"    fn wait_ok(&mut self) -> Result<()> {\n        let mut buf = [0; \"ok\\n\".len()];\n        self.read.read_exact(&mut buf)?;\n        ensure!(&buf == b\"ok\\n\");\n        Ok(())\n    }\n}\n\n#[derive(Debug, Default)]\npub struct LazyPipe {\n    pipe: RefCell<Option<Result<Pipe>>>,\n}\n\nimpl LazyPipe {\n    pub fn run(&self, config: &Config) -> Result<()> {\n        let mut pipe = self.pipe.borrow_mut();\n        let pipe = pipe.get_or_insert_with(|| spawn_auth(config).context(\"failed to spawn auth process\"));\n        let pipe = match pipe {\n            Err(e) => bail!(e.to_string()),\n            Ok(p) => p,\n        };\n        loop {}\n        pipe.write.write_all(b\"something\")?;\n        pipe.wait_ok()?;\n        Ok(())\n    }\n}\n\npub fn spawn_auth(config: &Config) -> Result<Pipe> {\n    let (paru_read, auth_write) = pipe()?;\n    let (auth_read, paru_write) = pipe()?;\n\n\n    /*Command::new(&config.sudo_bin)\n        .args(&config.sudo_flags)\n        .arg(std::env::current_exe()?)\n        .arg(\"--authpipe\")","sourceCodeStart":17,"sourceCodeEnd":53,"githubUrl":"https://github.com/Morganamilo/paru/blob/9ac3578807a87858651e81a02586ceb947686e7c/src/auth.rs#L17-L53","documentation":"`LazyPipe::run` failed to spawn the external authentication helper process; the spawn failure is wrapped with context 'failed to spawn auth process' and then cached (memoized) in the lazy pipe, so every subsequent `run` call reuses the same failure. This typically means the auth binary path in Config is wrong, the binary is missing, or it failed at exec time.","triggerScenarios":"First call to `LazyPipe::run(config)` where `spawn_auth(config)` fails (auth executable not found, not executable, bad args). The error is stored in the `RefCell<Option<Result<...>>>`, so all later runs bail with `e.to_string()` — the original spawn error.","commonSituations":"Auth helper not built/installed before running; misconfigured path in Config; environment lacking PATH or permissions to execute the helper; after a package upgrade the binary moved.","solutions":["Fix `spawn_auth`: verify the auth helper binary path in Config exists and is executable","Run the helper manually with the same args to see the underlying spawn error","Clear/replace the cached failure (recreate the LazyPipe) after fixing, since the Err is memoized"],"exampleFix":"// before\nlet pipe = pipe.get_or_insert_with(|| spawn_auth(config).context(\"failed to spawn auth process\"));\n// after\nlet pipe = match pipe.get_or_insert_with(|| spawn_auth(config).context(\"failed to spawn auth process\")) {\n    Err(e) => bail!(\"auth process: {} (verify helper path in config)\", e),\n    Ok(p) => p,\n};","handlingStrategy":"try-catch","validationCode":"// Validate the auth helper before first use\nfn verify_auth_helper(config: &Config) -> Result<()> {\n    let path = config.auth_helper_path();\n    ensure!(Path::new(&path).exists(), \"auth helper missing: {}\", path);\n    ensure!(is_executable(&path), \"auth helper not executable: {}\", path);\n    Ok(())\n}","typeGuard":null,"tryCatchPattern":"if let Err(e) = verify_auth_helper(&config) {\n    eprintln!(\"{}; falling back to interactive auth\", e);\n    return interactive_auth(&config);\n}\nauth_pipe.run(&config).context(\"auth process\")?;","preventionTips":["Check the helper binary exists and is executable at startup, not lazily","Remember the failure is memoized — recreate the LazyPipe after fixing the environment","Log the underlying spawn error, not just the context string","Pin the helper path in config instead of relying on PATH"],"tags":["auth","process-spawn","lazy-initialization","subprocess"],"backgroundTag":"missing-dependency","analyzedSha":"9ac3578807a87858651e81a02586ceb947686e7c","analyzedAt":"2026-09-12T04:57:59.861Z","contentChangedAt":"2026-09-12T04:57:59.861Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}