{"record":{"id":"e50eae379b1c1248","repo":"vitessio/vitess","slug":"errors-loading-package-s-s","errorCode":null,"errorMessage":"errors loading package %s: %s","messagePattern":"errors loading package (.+?): (.+?)","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"go/vt/vtctl/vtctldclient/codegen/main.go","lineNumber":312,"sourceCode":"\tpkgs, err := packages.Load(&packages.Config{\n\t\tMode: packages.NeedTypes | packages.NeedSyntax | packages.NeedTypesInfo,\n\t}, source)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tif len(pkgs) != 1 {\n\t\treturn nil, errors.New(\"must specify exactly one package\")\n\t}\n\n\tpkg := pkgs[0]\n\tif len(pkg.Errors) > 0 {\n\t\tvar err error\n\n\t\tfor _, e := range pkg.Errors {\n\t\t\tswitch err {\n\t\t\tcase nil:\n\t\t\t\terr = fmt.Errorf(\"errors loading package %s: %s\", source, e.Error())\n\t\t\tdefault:\n\t\t\t\terr = fmt.Errorf(\"%w; %s\", err, e.Error())\n\t\t\t}\n\t\t}\n\n\t\treturn nil, err\n\t}\n\n\treturn pkg, nil\n}\n\nfunc extractSourceInterface(pkg *packages.Package, name string) (*types.Interface, error) {\n\tobj := pkg.Types.Scope().Lookup(name)\n\tif obj == nil {\n\t\treturn nil, fmt.Errorf(\"no symbol found with name %s\", name)\n\t}\n\n\tswitch t := obj.Type().(type) {","sourceCodeStart":294,"sourceCodeEnd":330,"githubUrl":"https://github.com/vitessio/vitess/blob/01a25a7d176f94613b8d59d799f438380a8760e4/go/vt/vtctl/vtctldclient/codegen/main.go#L294-L330","documentation":"This is a code-generation tool for vtctldclient that wraps the vtctldata proto service. When the Go package loader (golang.org/x/tools/go/packages) fails to load the target package, loadPackage aggregates all load errors into a single error prefixed with 'errors loading package <path>'. It joins each individual error so the developer sees the complete failure list at once.","triggerScenarios":"Running the codegen main (go run ./go/vt/vtctl/vtctldclient/codegen) when pkg.Errors is non-empty after packages.Load — e.g. the package path is wrong, files have syntax/type errors, or dependencies cannot be resolved.","commonSituations":"Typos in the package pattern passed to packages.Load; missing go.sum entries or unresolved module versions; editing proto-generated Go files and leaving broken syntax; running codegen outside the module (no go.mod context); toolchain/version mismatch breaking imports.","solutions":["Run 'go build ./<package-path>' on the failing package and fix the compile/type errors reported (they are the underlying causes joined into this message)","Run 'go mod tidy' to restore missing module/sum entries","Verify the package path/pattern passed to packages.Load matches an existing directory in the module","Regenerate proto bindings (make proto / make codegen) if generated files are stale or missing","Ensure you run the codegen from the repository root with a working Go toolchain"],"exampleFix":"// before: broken generated file causes package load failure\nfunc (x *SomeType) Method() { return undefinedSymbol }\n// after: regenerate the bindings\n// make proto && go build ./vitess.io/vtctld...\n","handlingStrategy":"validation","validationCode":"// Pre-check the package compiles before running codegen\nout, err := exec.Command(\"go\", \"build\", \"./go/vt/vtctl/vtctldclient/...\").CombinedOutput()\nif err != nil {\n    return fmt.Errorf(\"package does not build, codegen will fail: %s\", out)\n}","typeGuard":null,"tryCatchPattern":"if err != nil {\n    var perr *packages.Error\n    if errors.As(err, &perr) { /* inspect joined load errors */ }\n    return err\n}","preventionTips":["Run 'go build ./...' before codegen","Keep go.mod/go.sum tidy with 'go mod tidy'","Never hand-edit generated files; regenerate instead","Run codegen from the repo root with a supported Go toolchain"],"tags":["go","codegen","package-loading","build"],"backgroundTag":"package-load-failure","analyzedSha":"01a25a7d176f94613b8d59d799f438380a8760e4","analyzedAt":"2026-09-01T17:28:30.605Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}