{"record":{"id":"9896968e5521f6f7","repo":"kubernetes/kops","slug":"reading-file-w","errorCode":null,"errorMessage":"reading file: %w","messagePattern":"reading file: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/commands/toolbox_enroll.go","lineNumber":881,"sourceCode":"\t\tremapPrefix := \"s3://\" // TODO: Support GCS?\n\n\t\t// targetDir is the location of the config on the target node.\n\t\ttargetDir := \"/etc/kubernetes/kops/config\"\n\n\t\t// remapFile remaps a file from s3/gcs etc to the local file system on the target node.\n\t\tremapFile := func(pSrc *string, destDir string) error {\n\t\t\tsrc := *pSrc\n\t\t\tif !strings.HasPrefix(src, remapPrefix) {\n\t\t\t\treturn nil\n\t\t\t}\n\n\t\t\tsrcPath, err := vfsContext.BuildVfsPath(src)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"building vfs path: %w\", err)\n\t\t\t}\n\t\t\tb, err := srcPath.ReadFile(ctx)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"reading file: %w\", err)\n\t\t\t}\n\n\t\t\tdest := strings.TrimPrefix(src, remapPrefix)\n\t\t\tdest = path.Join(destDir, dest)\n\t\t\tbootstrapData.NodeupScriptAdditionalFiles[dest] = b\n\n\t\t\t*pSrc = dest\n\t\t\treturn nil\n\t\t}\n\n\t\t// remapTree remaps a file tree from s3/gcs etc to the local file system on the target node.\n\t\tremapTree := func(pSrc *string, dest string) error {\n\t\t\tsrc := *pSrc\n\t\t\tif !strings.HasPrefix(src, remapPrefix) {\n\t\t\t\treturn nil\n\t\t\t}\n\n\t\t\tsrcPath, err := vfsContext.BuildVfsPath(src)","sourceCodeStart":863,"sourceCodeEnd":899,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/commands/toolbox_enroll.go#L863-L899","documentation":"After successfully building the VFS path, the code reads the object content with srcPath.ReadFile(ctx). Any read failure (object missing, permission denied, network error) is wrapped as 'reading file: %w'. The error path exists so individual additional-file fetch failures abort bootstrap-data building with a clear cause.","triggerScenarios":"BuildVfsPath succeeded but ReadFile fails: the object does not exist at the path, the caller lacks s3:GetObject/gs read permission, or a transient network/backend error occurs.","commonSituations":"Additional file deleted from the bucket after being referenced; bucket policy/KMS denies the current principal; object in a different region/account than assumed; transient S3 5xx/timeout.","solutions":["Read the wrapped cause to distinguish not-found vs permission vs network.","Verify the object exists: `aws s3 ls <path>` (or equivalent for your backend).","Grant read permission / KMS decrypt to the caller's credentials.","Retry on transient network errors with backoff."],"exampleFix":"// before\nb, err := srcPath.ReadFile(ctx) // fails: object deleted\n// after\naws s3 cp ./conf.yaml s3://bucket/files/conf.yaml  # re-upload referenced file, then retry","handlingStrategy":"retry","validationCode":"// Confirm the referenced object exists before enrollment\n_, err := os.Stat(localPath) // or aws s3 ls s3://bucket/files/conf.yaml\nif err != nil {\n\treturn fmt.Errorf(\"additional file %s missing\", src)\n}","typeGuard":null,"tryCatchPattern":"if err != nil {\n\tif os.IsPermission(errors.Unwrap(err)) {\n\t\treturn fmt.Errorf(\"access denied reading %s: fix IAM/KMS\", src)\n\t}\n\treturn retry.WithBackoff(func() error { _, err := srcPath.ReadFile(ctx); return err }, 3)\n}","preventionTips":["Keep referenced additional files present in the bucket for the cluster's lifetime","Grant s3:GetObject / KMS decrypt to the operator credentials","Checksum/verify uploads after editing bucket contents"],"tags":["kops","vfs","file-read","permissions"],"backgroundTag":"vfs-file-read-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}