{"record":{"id":"7a393e9d39a51f54","repo":"ahmetb/kubectx","slug":"failed-to-serialize-kubeconfig-w","errorCode":null,"errorMessage":"failed to serialize kubeconfig: %w","messagePattern":"failed to serialize kubeconfig: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/proxy/kubeconfig.go","lineNumber":48,"sourceCode":"\t\tcfg.AuthInfos[name] = &clientcmdapi.AuthInfo{}\n\t}\n\n\t// Rename contexts with [RO] suffix to indicate readonly mode.\n\trenames := make(map[string]string, len(cfg.Contexts))\n\tfor name := range cfg.Contexts {\n\t\trenames[name] = name + \"[RO]\"\n\t}\n\tfor old, roName := range renames {\n\t\tcfg.Contexts[roName] = cfg.Contexts[old]\n\t\tdelete(cfg.Contexts, old)\n\t\tif cfg.CurrentContext == old {\n\t\t\tcfg.CurrentContext = roName\n\t\t}\n\t}\n\n\tout, err := clientcmd.Write(*cfg)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to serialize kubeconfig: %w\", err)\n\t}\n\treturn out, nil\n}\n","sourceCodeStart":30,"sourceCodeEnd":52,"githubUrl":"https://github.com/ahmetb/kubectx/blob/12ad6fb22e8c546ee2b54e7de38aa51c906832f7/internal/proxy/kubeconfig.go#L30-L52","documentation":"After rewriting clusters and contexts, RewriteKubeconfig serializes the modified clientcmdapi.Config back to YAML with clientcmd.Write. This error wraps any serialization failure from client-go. It is rare in practice because the in-memory struct was valid, but clientcmd.Write can fail when the config contains data that cannot round-trip (e.g. invalid LocationOfOrigin-derived entries or internal validation errors).","triggerScenarios":"Calling RewriteKubeconfig where clientcmd.Write(*cfg) returns an error — most commonly from malformed values injected into the config struct (invalid YAML-encodable field content) or a client-go internal validation failure during write.","commonSituations":"A source kubeconfig containing exotic/invalid field values that survive parse but fail write; a client-go version whose Write implementation validates more strictly than Load; extremely large or binary fields that cannot be encoded.","solutions":["Read the wrapped error from client-go to identify which entry fails; remove/repair that cluster or user entry in the source kubeconfig","Upgrade or align client-go/sigstore versions — older clientcmd versions had stricter Write validation","Sanitize the input kubeconfig (e.g. kubectl config view --raw --minify) before passing it to RewriteKubeconfig","If reproducible, round-trip test: clientcmd.Load then Write a minimal config to isolate the offending stanza"],"exampleFix":"// before\nout, err := proxy.RewriteKubeconfig(dirtyData, addr)\n// after\nclean, _ := clientcmd.Write(*minifiedCfg) // sanitize first\nout, err := proxy.RewriteKubeconfig(clean, addr)","handlingStrategy":"try-catch","validationCode":"// Go\n// Round-trip sanity check before calling RewriteKubeconfig\ncfg, err := clientcmd.Load(data)\nif err != nil { return err }\nif _, err := clientcmd.Write(*cfg); err != nil {\n    return fmt.Errorf(\"source kubeconfig cannot be serialized: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"out, err := proxy.RewriteKubeconfig(data, addr)\nif err != nil && strings.Contains(err.Error(), \"failed to serialize\") {\n    return fmt.Errorf(\"sanitize source kubeconfig (kubectl config view --raw --minify): %w\", err)\n}","preventionTips":["Minify/sanitize kubeconfigs before rewriting unusual sources","Keep client-go versions consistent across build and runtime","Round-trip test (Load→Write) suspicious kubeconfigs in CI","Remove exotic user/cluster entries (binary data, exec blobs) before programmatic rewriting"],"tags":["kubeconfig","serialization","client-go","go"],"backgroundTag":"kubeconfig-serialize-failed","analyzedSha":"12ad6fb22e8c546ee2b54e7de38aa51c906832f7","analyzedAt":"2026-09-02T12:23:10.107Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T16:17:10.729Z"}