{"record":{"id":"f447591849389e36","repo":"hashicorp/nomad","slug":"failed-to-fingerprint-internal-plugins-v","errorCode":null,"errorMessage":"failed to fingerprint internal plugins: %v","messagePattern":"failed to fingerprint internal plugins: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"helper/pluginutils/loader/init.go","lineNumber":64,"sourceCode":"\t\t} else if config.Factory == nil {\n\t\t\t_ = multierror.Append(&mErr, fmt.Errorf(\"nil factory passed for internal plugin %s\", k))\n\t\t\tcontinue\n\t\t}\n\t}\n\n\treturn mErr.ErrorOrNil()\n}\n\n// init initializes the plugin loader by compiling both internal and external\n// plugins and selecting the highest versioned version of any given plugin.\nfunc (l *PluginLoader) init(cfg *PluginLoaderConfig) (map[string]*config.PluginConfig, error) {\n\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","sourceCodeStart":46,"sourceCodeEnd":82,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/helper/pluginutils/loader/init.go#L46-L82","documentation":"During loader initialization, initInternal instantiates each internal plugin via its factory and fingerprints it. Any error from that step (factory panic-free failure, fingerprint failure) is wrapped with this message and aborts NewPluginLoader.","triggerScenarios":"An internal plugin's Factory returns an object that fails fingerprinting (BasePlugin handshake fails), or the underlying fingerprint routine errors (unsupported platform, plugin API version mismatch).","commonSituations":"A custom internal plugin whose implementation doesn't satisfy the fingerprint handshake; architecture/OS where the plugin can't run; version skew between the plugin library and the loader.","solutions":["Inspect the wrapped inner error (%v) to find which internal plugin failed and why.","Verify the plugin's Factory returns an object implementing the full base.BasePlugin interface.","Test the plugin's fingerprint handshake in isolation before loading it via the loader.","Skip registering the problematic internal plugin if it is optional for your build."],"exampleFix":"// before\nplugins := map[string]*InternalPluginConfig{\"dev\": {Factory: myFactory}}\n\n// after\nif _, ok := myFactory(ctx, logger).(base.BasePlugin); !ok {\n    logger.Warn(\"plugin does not implement base interface; not registering\")\n} else {\n    plugins[\"dev\"] = &InternalPluginConfig{Factory: myFactory}\n}","handlingStrategy":"try-catch","validationCode":"for name, ipc := range cfg.InternalPlugins {\n    if probe := ipc.Factory(context.Background(), logger); probe == nil {\n        return fmt.Errorf(\"internal plugin %q factory returned nil\", name)\n    }\n}","typeGuard":"func implementsBasePlugin(raw interface{}) bool {\n    _, ok := raw.(base.BasePlugin)\n    return ok\n}","tryCatchPattern":"loader, err := NewPluginLoader(cfg)\nif err != nil {\n    var inner string = err.Error()\n    if strings.Contains(inner, \"failed to fingerprint internal plugins\") {\n        logger.Error(\"internal plugin init failed\", \"detail\", inner)\n        // drop the failing internal plugin and retry\n        loader, retryErr := NewPluginLoader(cfgWithoutFailingPlugin)\n        ...\n    }\n    return err\n}","preventionTips":["Unit-test each internal plugin's fingerprint path on all target GOOS/GOARCH values.","Ensure factories return base.BasePlugin-compatible objects, never nil.","Keep the plugin API library version in sync between host and plugin."],"tags":["go","plugins","fingerprinting","initialization"],"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"}