{"record":{"id":"1a4b66163eb2bb6a","repo":"xai-org/grok-build","slug":"npm-view-failed","errorCode":null,"errorMessage":"npm view @{} failed: {}","messagePattern":"npm view @(.+?) failed: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/codegen/xai-grok-update/src/version.rs","lineNumber":192,"sourceCode":"        NPM_PACKAGE.to_string()\n    } else {\n        format!(\"{}@{}\", NPM_PACKAGE, tag)\n    };\n    let mut args = vec![\"view\", &pkg_spec, \"version\", \"--json\"];\n    let registry_flag;\n    if let Some(registry) = npm_registry {\n        registry_flag = format!(\"--registry={}\", registry);\n        args.push(&registry_flag);\n    }\n    let mut cmd = Command::new(\"npm\");\n    cmd.args(&args).stdin(std::process::Stdio::null());\n    xai_grok_tools::util::detach_command(&mut cmd);\n    cmd.envs(xai_grok_tools::util::pager_env());\n    let output = cmd.output().await?;\n\n    if !output.status.success() {\n        let stderr = String::from_utf8_lossy(&output.stderr);\n        anyhow::bail!(\"npm view @{} failed: {}\", tag, stderr.trim());\n    }\n\n    let stdout = String::from_utf8(output.stdout)?;\n    let value: Value = serde_json::from_str(stdout.trim())?;\n    match value {\n        Value::String(version) => Ok(version),\n        Value::Array(values) => values\n            .iter()\n            .rev()\n            .find_map(|entry| entry.as_str().map(|item| item.to_string()))\n            .ok_or_else(|| anyhow::anyhow!(\"npm view @{} returned empty version list\", tag)),\n        _ => anyhow::bail!(\"npm view @{} returned unexpected JSON\", tag),\n    }\n}\n\n/// Fetch the latest version from GitHub Releases using `gh release list`.\n/// For alpha channel, fetches both pre-release and stable-only, returns the\n/// semver-greater — `gh release list --limit 1` orders by publication date,","sourceCodeStart":174,"sourceCodeEnd":210,"githubUrl":"https://github.com/xai-org/grok-build/blob/bc7f02eddd3d84085849dc19ed216f11c23b0571/crates/codegen/xai-grok-update/src/version.rs#L174-L210","documentation":"fetch_npm_tag runs `npm view <pkg>@<tag> --json` (detached, with pager disabled) and reads its JSON stdout. If the npm process exits non-zero, the function bails with the tag and the trimmed stderr, so npm's own diagnostic (network error, 404, auth failure) is embedded in this error message.","triggerScenarios":"Any non-zero exit of the underlying `npm view` command in fetch_npm_tag — e.g. the package@tag does not exist, npm is missing or not on PATH, the registry is unreachable, a proxy blocks the request, or auth is required for a private package. Called via fetch_npm_version and fetch_npm_tag_for_test.","commonSituations":"Offline/VPN/CI environment without registry access; typo'd package name or tag (latest/alpha); corporate proxy or custom registry misconfiguration; private registry requiring login (npm login); npm not installed in container images.","solutions":["Inspect the stderr embedded in the message — it contains npm's actual cause (ENOTFOUND, 404, E401, etc.)","Verify network/registry access: run `npm view <pkg>@<tag>` manually and check .npmrc registry/proxy settings","Confirm the package name and dist-tag exist on the registry (npm view <pkg> versions)","For private registries, run npm login or configure credentials; ensure npm is installed and on PATH"],"exampleFix":"// before (no registry access)\nnpm view @xai/grok@latest  -> ENOTFOUND registry.npmjs.org\n// after: point npm at the reachable registry and retry\nnpm config set registry https://registry.npmjs.org/\n# or set proxy: npm config set proxy http://proxy.corp:8080","handlingStrategy":"retry","validationCode":"// Preflight: ensure npm exists and the registry is reachable before calling fetch_npm_tag\nwhich::\"npm\".ok_or(\"npm not found on PATH\")?;\nlet ok = std::process::Command::new(\"npm\")\n    .args([\"ping\"])\n    .output()\n    .map(|o| o.status.success())\n    .unwrap_or(false);\nif !ok { eprintln!(\"npm registry unreachable; fix network/.npmrc before updating\"); }","typeGuard":null,"tryCatchPattern":"// Retry transient npm failures with backoff; surface stderr for permanent ones\nfor attempt in 0..3 {\n    match fetch_npm_version(tag).await {\n        Ok(v) => break Ok(v),\n        Err(e) if e.to_string().contains(\"npm view\") && is_transient(&e) && attempt < 2 => {\n            tokio::time::sleep(Duration::from_secs(2u64.pow(attempt))).await;\n        }\n        Err(e) => break Err(e),\n    }\n}","preventionTips":["Ensure npm is installed and on PATH in CI images and containers","Configure registry/proxy/auth in .npmrc before running updates (npm login for private registries)","Check the embedded stderr in the message first — it names the real npm failure (ENOTFOUND, E401, 404)","Add retry-with-backoff around version lookups to tolerate transient registry/network blips"],"tags":["npm","network","version-lookup"],"backgroundTag":"npm-command-failed","analyzedSha":"bc7f02eddd3d84085849dc19ed216f11c23b0571","analyzedAt":"2026-08-31T04:59:42.031Z","schemaVersion":2},"datasetVersion":"2026-08-31T09:17:48.483Z"}