{"record":{"id":"7dbdadc2daa0e720","repo":"hyperledger/fabric","slug":"failed-to-generate-a-dockerfile-s","errorCode":null,"errorMessage":"Failed to generate a Dockerfile: %s","messagePattern":"Failed to generate a Dockerfile: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"core/chaincode/platforms/platforms.go","lineNumber":187,"sourceCode":"\t}\n\n\t_, err = tw.Write(payload)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (r *Registry) GenerateDockerBuild(ccType, path string, codePackage io.Reader, client dcli.APIClient) (io.Reader, error) {\n\tinputFiles := make(map[string][]byte)\n\n\t// ----------------------------------------------------------------------------------------------------\n\t// Generate the Dockerfile specific to our context\n\t// ----------------------------------------------------------------------------------------------------\n\tdockerFile, err := r.GenerateDockerfile(ccType)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"Failed to generate a Dockerfile: %s\", err)\n\t}\n\n\tinputFiles[\"Dockerfile\"] = []byte(dockerFile)\n\n\t// ----------------------------------------------------------------------------------------------------\n\t// Finally, launch an asynchronous process to stream all of the above into a docker build context\n\t// ----------------------------------------------------------------------------------------------------\n\tinput, output := io.Pipe()\n\n\tgo func() {\n\t\tgw := gzip.NewWriter(output)\n\t\ttw := tar.NewWriter(gw)\n\t\terr := r.StreamDockerBuild(ccType, path, codePackage, inputFiles, tw, client)\n\t\tif err != nil {\n\t\t\tlogger.Error(err)\n\t\t}\n\n\t\ttw.Close()","sourceCodeStart":169,"sourceCodeEnd":205,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/core/chaincode/platforms/platforms.go#L169-L205","documentation":"GenerateDockerBuild fails when the platform's GenerateDockerfile call returns an error while producing the Dockerfile specific to the chaincode context. This error is created with fmt.Errorf (not errors.Wrap), so the underlying reason is embedded via %s. Without a valid Dockerfile the docker build context cannot be assembled.","triggerScenarios":"Calling GenerateDockerBuild for a chaincode package where the platform's GenerateDockerfile(ccType) returns an error — typically an unsupported chaincode type or failure to read version metadata.","commonSituations":"Packaging chaincode with an unsupported ccType, or platform code failing to detect the Go/runtime version needed to template the Dockerfile.","solutions":["Check the embedded %s cause for the platform-specific failure","Verify ccType is a supported pb.ChaincodeSpec type","Ensure runtime version metadata (Go version, OS) is detectable in the environment","Regenerate the package with a supported chaincode type"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"switch ccType {\ncase pb.ChaincodeSpec_GOLANG.String(), pb.ChaincodeSpec_CAR.String(), pb.ChaincodeSpec_JAVA.String():\n    // ok\ndefault:\n    return fmt.Errorf(\"unsupported ccType for Dockerfile generation: %s\", ccType)\n}","typeGuard":null,"tryCatchPattern":"if err != nil {\n    return fmt.Errorf(\"dockerfile generation failed: %s — verify ccType and runtime metadata\", err)\n}","preventionTips":["Use only supported chaincode spec types when packaging","Ensure runtime version detection works in the build environment","Log the full embedded error to identify the failing platform"],"tags":["docker","dockerfile","chaincode","packaging"],"backgroundTag":"dockerfile-generation-failed","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}