{"record":{"id":"2d9380c3df272ba9","repo":"hashicorp/nomad","slug":"failed-to-fingerprint-plugins-v","errorCode":null,"errorMessage":"failed to fingerprint plugins: %v","messagePattern":"failed to fingerprint plugins: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"helper/pluginutils/loader/init.go","lineNumber":76,"sourceCode":"\t// Create a mapping of name to config\n\tconfigMap := configMap(cfg.Configs)\n\n\t// Initialize the internal plugins\n\tinternal, err := l.initInternal(cfg.InternalPlugins, configMap)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to fingerprint internal plugins: %v\", err)\n\t}\n\n\t// Scan for eligibile binaries\n\tplugins, err := l.scan()\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to scan plugin directory %q: %v\", l.pluginDir, err)\n\t}\n\n\t// Fingerprint the passed plugins\n\texternal, err := l.fingerprintPlugins(plugins, configMap)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to fingerprint plugins: %v\", err)\n\t}\n\n\t// Merge external and internal plugins\n\tl.plugins = l.mergePlugins(internal, external)\n\n\t// Validate that the configs are valid for the plugins\n\tcanonicalizedConfigs, err := l.validatePluginConfigs()\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"parsing plugin configurations failed: %v\", err)\n\t}\n\n\tfor i := range configMap {\n\t\tif updated, ok := canonicalizedConfigs[i]; ok {\n\t\t\tconfigMap[i].Config = updated.Config\n\t\t}\n\t}\n\n\treturn configMap, nil","sourceCodeStart":58,"sourceCodeEnd":94,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/helper/pluginutils/loader/init.go#L58-L94","documentation":"Once binaries are scanned, fingerprintPlugins runs each candidate binary (the loader launches it with a fingerprint argument) to detect its API version and plugin type. Failures here—binary that won't exec, crashes, bad exit, unreadable file—are wrapped with this message and abort construction.","triggerScenarios":"A file in the plugin dir is not a valid executable for the host (wrong architecture, script without shebang, corrupted binary); the plugin binary crashes during fingerprinting; timeout on the fingerprint handshake.","commonSituations":"Copying plugins built for a different OS/arch (linux/amd64 binary on arm64); downloading a plugin over HTTP that got an HTML error page instead of a binary; SELinux or noexec mount preventing execution; plugin built against an incompatible plugin API version.","solutions":["Run the failing binary manually (path shown by enabling loader logs) to see the exec error.","Re-download/rebuild the plugin for the host GOOS/GOARCH and verify with `file <binary>`.","Check mount flags (noexec) and security modules (SELinux) that block execution.","Remove incompatible binaries from the plugin directory if they are not needed."],"exampleFix":"// before\n$ curl -o /opt/plugins/my-plugin https://example.com/my-plugin  # may fetch HTML\n\n// after\n$ curl -fSL -o /opt/plugins/my-plugin https://example.com/my-plugin\n$ chmod +x /opt/plugins/my-plugin && file /opt/plugins/my-plugin","handlingStrategy":"validation","validationCode":"entries, err := os.ReadDir(cfg.PluginDir)\nif err != nil {\n    return err\n}\nfor _, e := range entries {\n    p := filepath.Join(cfg.PluginDir, e.Name())\n    if err := exec.Command(p, \"-version\").Run(); err != nil {\n        return fmt.Errorf(\"plugin %q not executable on this host: %w\", p, err)\n    }\n}","typeGuard":null,"tryCatchPattern":"loader, err := NewPluginLoader(cfg)\nif err != nil {\n    if strings.Contains(err.Error(), \"failed to fingerprint plugins\") {\n        logger.Warn(\"plugin fingerprinting failed; check binaries\", \"err\", err)\n        return fmt.Errorf(\"repair or remove incompatible plugin binaries: %w\", err)\n    }\n    return err\n}","preventionTips":["Download plugins with checksum verification for the host GOOS/GOARCH.","Keep plugin binaries out of noexec mounts and SELinux-restricted paths.","Match plugin API versions between binary and host library.","Test `file <binary>` / exec a dry-run after deployment."],"tags":["go","plugins","fingerprinting","exec"],"backgroundTag":"plugin-fingerprint-failed","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}