{"record":{"id":"38c42020683b5b42","repo":"GoogleContainerTools/skaffold","slug":"marshalling-configuration-w","errorCode":null,"errorMessage":"marshalling configuration: %w","messagePattern":"marshalling configuration: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/skaffold/app/cmd/diagnose.go","lineNumber":98,"sourceCode":"\t}\n\n\tif !yamlOnly {\n\t\tif err := printArtifactDiagnostics(ctx, out, configs); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\t// remove the dependency config references since they have already been imported and will be marshalled together.\n\tfor i := range configs {\n\t\tconfigs[i].(*latest.SkaffoldConfig).Dependencies = nil\n\t}\n\tif enableTemplating {\n\t\tif err := tags.ApplyTemplates(configs); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\tbuf, err := yaml.MarshalWithSeparator(configs)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"marshalling configuration: %w\", err)\n\t}\n\n\tout.Write(buf)\n\n\treturn nil\n}\n\nfunc printArtifactDiagnostics(ctx context.Context, out io.Writer, configs []schemaUtil.VersionedConfig) error {\n\trunCtx, err := getRunContext(ctx, opts, configs)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"getting run context: %w\", err)\n\t}\n\ttagger, err := tag.NewTaggerMux(runCtx)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"getting tagger: %w\", err)\n\t}\n\timageTags, err := deployutil.ImageTags(ctx, runCtx, tagger, out, runCtx.Artifacts())\n\tif err != nil {","sourceCodeStart":80,"sourceCodeEnd":116,"githubUrl":"https://github.com/GoogleContainerTools/skaffold/blob/a1189de023efc32d4b8e11f395acc678aa555011/cmd/skaffold/app/cmd/diagnose.go#L80-L116","documentation":"Wraps a yaml.MarshalWithSeparator failure in `skaffold diagnose` when serializing the parsed skaffold configs for the diagnostics output. Marshalling a parsed latest.SkaffoldConfig should virtually never fail; if it does, the config contains data that cannot round-trip through the YAML encoder (unsupported types introduced by a schema/plugin mismatch).","triggerScenarios":"`skaffold diagnose` calls yaml.MarshalWithSeparator(configs) and the marshaller returns an error, typically because configs contain an unsupported value type after custom deserialization or a versioned-config conversion.","commonSituations":"Using skaffold with custom transform/extension plugins that inject non-marshalable values; version skew between skaffold binary and config schema producing unrepresentable fields.","solutions":["Re-run with an official skaffold build matching your skaffold.yaml apiVersion","Remove custom transforms/plugins temporarily and re-run diagnose to isolate the cause","Simplify the skaffold.yaml (drop experimental fields) to find the non-marshalable section","File a bug with the wrapped error if a plain config still fails"],"exampleFix":"// before: diagnose fails on exotic config\n// after: validate the config parses and round-trips\nskaffold diagnose --yaml-only   # or\nskaffold config list            # sanity check CLI works on same config","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"err := diagnose(); err != nil {\n    if strings.Contains(err.Error(), \"marshalling configuration:\") {\n        // config contains unmarshalable data — test with a minimal skaffold.yaml\n    }\n}","preventionTips":["Keep skaffold binary and config apiVersion in sync","Avoid experimental plugin fields in production configs","Report persistent marshal failures with a minimal repro to skaffold"],"tags":["skaffold","yaml","serialization"],"backgroundTag":"yaml-marshal-failed","analyzedSha":"a1189de023efc32d4b8e11f395acc678aa555011","analyzedAt":"2026-09-05T12:09:27.064Z","contentChangedAt":"2026-09-05T12:09:27.064Z","schemaVersion":2},"datasetVersion":"2026-09-12T17:17:11.597Z"}