{"record":{"id":"767961ca01c1f6cf","repo":"jdx/mise","slug":"rustup-show-profile-returned-an-empty-profile-for","errorCode":null,"errorMessage":"rustup show profile returned an empty profile for {}","messagePattern":"rustup show profile returned an empty profile for (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/plugins/core/rust.rs","lineNumber":281,"sourceCode":"        let mut cmd = cmd(runtime.bin_dir.join(RUSTUP_BIN), args)\n            .env(\"PATH\", rustup_path_env(runtime)?)\n            .stdout_capture()\n            .stderr_capture()\n            .unchecked();\n        for (key, value) in rustup_env(&runtime.homes, &tv.version) {\n            cmd = cmd.env(key, value);\n        }\n        let output = cmd.run()?;\n        if !output.status.success() {\n            bail!(\n                \"rustup show profile failed for {}: {}\",\n                tv.style(),\n                String::from_utf8_lossy(&output.stderr).trim()\n            );\n        }\n        let profile = String::from_utf8_lossy(&output.stdout).trim().to_string();\n        if profile.is_empty() {\n            bail!(\n                \"rustup show profile returned an empty profile for {}\",\n                tv.style()\n            );\n        }\n        Ok(profile)\n    }\n\n    fn missing_components(\n        &self,\n        requested: &[String],\n        installed: &BTreeSet<String>,\n    ) -> Vec<String> {\n        requested\n            .iter()\n            .filter(|component| !rustup_component_installed(installed, component))\n            .cloned()\n            .collect()\n    }","sourceCodeStart":263,"sourceCodeEnd":299,"githubUrl":"https://github.com/jdx/mise/blob/afd2eddd3a50c16190efc1c7e94404b48f72af57/src/plugins/core/rust.rs#L263-L299","documentation":"After `rustup show profile` exits successfully, mise trims stdout and requires a non-empty profile name. An empty output means rustup succeeded but returned nothing parseable, so mise cannot determine the default profile and refuses to continue rather than guessing.","triggerScenarios":"Called from is_install_satisfied or install_version_ via rustup_default_profile when `rustup show profile` exits 0 but prints no profile — typically a rustup version too old to support `show profile`, or output redirected/swallowed by a rustup shim/wrapper that emits nothing.","commonSituations":"Very old rustup versions predating `rustup show profile`; a wrapper script or shim intercepting rustup and dropping stdout; rustup configured with no default toolchain in a way that prints empty output.","solutions":["Update rustup (`rustup self update`) to a version that supports `show profile`.","Run `rustup show profile` manually; if empty, set a default toolchain (`rustup default stable`).","Check for rustup shims/wrappers on PATH that may swallow stdout and bypass them.","Reinstall rustup cleanly if the installation is corrupted."],"exampleFix":"// before: ancient rustup\n$ rustup show profile\n(empty output)\n// after\n$ rustup self update\n$ rustup show profile\ndefault","handlingStrategy":"validation","validationCode":"let out = std::process::Command::new(\"rustup\").args([\"show\", \"profile\"]).output()?;\nlet profile = String::from_utf8_lossy(&out.stdout).trim().to_string();\nif profile.is_empty() {\n    eprintln!(\"rustup too old or misconfigured; run `rustup self update` and `rustup default stable`\");\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Update rustup regularly (`rustup self update`) — `show profile` needs a recent version.","Check for and remove rustup shim/wrapper scripts that swallow stdout.","Always set a default toolchain so `rustup show profile` prints a value."],"tags":["rust","rustup","subprocess","empty-output"],"backgroundTag":"empty-response-body","analyzedSha":"afd2eddd3a50c16190efc1c7e94404b48f72af57","analyzedAt":"2026-09-09T01:38:25.179Z","contentChangedAt":"2026-09-09T01:38:25.179Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}