{"record":{"id":"fb0df6985a3a6580","repo":"googleapis/mcp-toolbox","slug":"cannot-resolve-path-q-no-existing-ancestor","errorCode":null,"errorMessage":"cannot resolve path %q: no existing ancestor","messagePattern":"cannot resolve path %q: no existing ancestor","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/tools/cloudstorage/cloudstoragecommon/paths.go","lineNumber":94,"sourceCode":"\tresolved, err := filepath.EvalSymlinks(path)\n\tif err == nil {\n\t\treturn resolved, nil\n\t}\n\tif !errors.Is(err, fs.ErrNotExist) {\n\t\treturn \"\", fmt.Errorf(\"cannot resolve path %q: %w\", path, err)\n\t}\n\n\t// Walk up to the deepest ancestor that does resolve, remembering the\n\t// components we stepped over so they can be reattached to it.\n\tvar missing []string\n\tcur := path\n\tfor {\n\t\tif fi, lerr := os.Lstat(cur); lerr == nil && fi.Mode()&fs.ModeSymlink != 0 {\n\t\t\treturn \"\", fmt.Errorf(\"path %q traverses unresolvable symbolic link %q\", path, cur)\n\t\t}\n\t\tparent := filepath.Dir(cur)\n\t\tif parent == cur {\n\t\t\treturn \"\", fmt.Errorf(\"cannot resolve path %q: no existing ancestor\", path)\n\t\t}\n\t\tmissing = append([]string{filepath.Base(cur)}, missing...)\n\t\tcur = parent\n\n\t\tresolvedParent, perr := filepath.EvalSymlinks(cur)\n\t\tif perr == nil {\n\t\t\treturn filepath.Join(append([]string{resolvedParent}, missing...)...), nil\n\t\t}\n\t\tif !errors.Is(perr, fs.ErrNotExist) {\n\t\t\treturn \"\", fmt.Errorf(\"cannot resolve path %q: %w\", path, perr)\n\t\t}\n\t}\n}\n\n// escapes reports whether target lies outside dir. Both are expected to be\n// cleaned absolute paths.\nfunc escapes(dir, target string) (bool, error) {\n\twithin, err := filepath.Rel(dir, target)","sourceCodeStart":76,"sourceCodeEnd":112,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/cloudstorage/cloudstoragecommon/paths.go#L76-L112","documentation":"ResolveSymlinks walked all the way up without finding any existing ancestor directory (the walk reached the root), so there is no resolvable base to anchor the path — effectively the path's directories do not exist yet and cannot be verified.","triggerScenarios":"Thrown at internal/tools/cloudstorage/cloudstoragecommon/paths.go:94 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Create the parent directories before running the tool","Check the path for typos in early components","Verify the mount/root actually exists"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"8cc6e09de2ad7b8bffc77751799585a1401a48eb","analyzedAt":"2026-09-05T01:10:36.887Z","contentChangedAt":"2026-09-05T01:10:36.887Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}