{"record":{"id":"cc702cde069b47cc","repo":"hashicorp/nomad","slug":"failed-to-create-file-q-w","errorCode":null,"errorMessage":"failed to create file %q: %w","messagePattern":"failed to create file %q: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"command/operator_debug.go","lineNumber":1475,"sourceCode":"\n// newFile returns a func that creates a new file for writing and returns it as\n// an io.WriterCloser interface. The caller is responsible for closing the\n// io.Writer when its done.\n//\n// Note: methods cannot be generic in go, so this function returns a function\n// that closes over our command so that we can still reference the command\n// object's fields to validate the file. In future iterations it might be nice\n// if we could move most of the command into standalone functions.\nfunc (c *OperatorDebugCommand) newFile(dir, file string) writerGetter {\n\treturn func() (io.WriteCloser, error) {\n\t\tfilePath, err := c.newFilePath(dir, file)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\twriter, err := os.Create(filePath)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"failed to create file %q: %w\", filePath, err)\n\t\t}\n\t\treturn writer, nil\n\t}\n}\n\n// writeResponseToFile writes a response object to a file. It returns an error\n// that the caller should report to the UI.\nfunc writeResponseToFile(obj any, getWriterFn writerGetter) error {\n\n\twriter, err := getWriterFn()\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer writer.Close()\n\n\terr = writeJSON(obj, writer)\n\tif err != nil {\n\t\treturn err","sourceCodeStart":1457,"sourceCodeEnd":1493,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/command/operator_debug.go#L1457-L1493","documentation":"Thrown inside the writerGetter closure of the operator debug package when `os.Create(filePath)` fails while opening an archive file for writing. It is the writer-producing counterpart of the writeBytes create error and wraps the underlying OS error with the file path.","triggerScenarios":"os.Create failing for a validated path during capture setup: permission denied on collectDir, too many open file descriptors, target path is an existing directory, ENOSPC.","commonSituations":"Debug collection running under a user lacking write access; long captures exhausting file descriptors; leftover directory at the archive path.","solutions":["Check the wrapped OS error and fix accordingly (permissions, ulimit, stale directory).","Ensure the process user can write to the capture/output directory.","Raise the open-file limit if many captures run concurrently (`ulimit -n 4096`).","Verify disk space on the output volume."],"exampleFix":"// before (shell)\nulimit -n   # 256, too low for concurrent captures\n// after\nulimit -n 4096 && nomad operator debug -output \"$HOME/debug\"","handlingStrategy":"try-catch","validationCode":"if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &r); err == nil && r.Cur < 1024 {\n    return fmt.Errorf(\"open-file limit %d too low for capture\", r.Cur)\n}","typeGuard":null,"tryCatchPattern":"writer, err := writerGetter()\nif err != nil {\n    var pe *fs.PathError\n    if errors.As(err, &pe) && (errors.Is(pe.Err, syscall.EACCES) || errors.Is(pe.Err, syscall.EMFILE)) {\n        // fix permissions or fd limit, then retry once\n    }\n    return err\n}","preventionTips":["Run captures with sufficient RLIMIT_NOFILE for the number of concurrent archive files.","Ensure the output directory is writable by the process user.","Clean up stale directories at archive paths before collection.","Monitor disk space to avoid ENOSPC during create."],"tags":["filesystem","file-create","permissions","debug"],"backgroundTag":"file-create-permission-denied","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}