{"record":{"id":"4308afa823147fcb","repo":"hyperledger/fabric","slug":"error-reading-input","errorCode":null,"errorMessage":"error reading input","messagePattern":"error reading input","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/configtxlator/main.go","lineNumber":177,"sourceCode":"\treturn nil\n}\n\nfunc decodeProto(msgName string, input, output *os.File) error {\n\tmt, err := protoregistry.GlobalTypes.FindMessageByName(protoreflect.FullName(msgName))\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error encode input\")\n\t}\n\n\tmsgType := reflect.TypeOf(mt.Zero().Interface())\n\n\tif msgType == nil {\n\t\treturn errors.Errorf(\"message of type %s unknown\", msgType)\n\t}\n\tmsg := reflect.New(msgType.Elem()).Interface().(proto.Message)\n\n\tin, err := io.ReadAll(input)\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error reading input\")\n\t}\n\n\terr = proto.Unmarshal(in, msg)\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error unmarshalling\")\n\t}\n\n\terr = protolator.DeepMarshalJSON(output, msg)\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error encoding output\")\n\t}\n\n\treturn nil\n}\n\nfunc computeUpdt(original, updated, output *os.File, channelID string) error {\n\torigIn, err := io.ReadAll(original)\n\tif err != nil {","sourceCodeStart":159,"sourceCodeEnd":195,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/cmd/configtxlator/main.go#L159-L195","documentation":"io.ReadAll on the --input file failed while decodeProto was loading the serialized proto. The wrapper \"error reading input\" indicates an OS-level read problem (closed pipe, permission, or filesystem error), not malformed protobuf content.","triggerScenarios":"Input file is unreadable (permissions), a FIFO/pipe closed early, a dangling path passed via shell redirection, or disk/IO error while reading stdin redirect.","commonSituations":"Running configtxlator in a container without mounting the config file, wrong user permissions after `sudo` generation of channel artifacts, or piping from a command that exited early.","solutions":["Check the input path exists and is readable by the current user (ls -l, test -r)","If piping, verify the producing command succeeds before configtxlator reads","Re-run with correct file mount/permissions in containers","Copy the file locally and retry to rule out filesystem/IO issues"],"exampleFix":"// before\nconfigtxlator decode --input /etc/hyperledger/config.pb ...\n// after\nchmod a+r /etc/hyperledger/config.pb && configtxlator decode --input /etc/hyperledger/config.pb ...","handlingStrategy":"validation","validationCode":"// POSIX guard before running\nif [ ! -r \"$INPUT\" ] || [ ! -s \"$INPUT\" ]; then echo \"input missing/unreadable\" >&2; exit 1; fi","typeGuard":null,"tryCatchPattern":"out, err := decodeCmd.CombinedOutput()\nif err != nil {\n    var exitErr *exec.ExitError\n    if errors.As(err, &exitErr) && strings.Contains(string(out), \"error reading input\") {\n        // fix file path/permissions and retry once\n    }\n    return err\n}","preventionTips":["test -r the input before invoking","Avoid piping from commands that may exit early; use files","Mount config dirs read-write in containers"],"tags":["io","file","configtxlator","fabric"],"backgroundTag":"file-read-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"}