Function appendSecureFile

browse/src/file-permissions.ts:133–140

(
  filePath: string,
  data: string | NodeJS.ArrayBufferView,
)

 * (no need to re-run icacls on every log line).
 */
export function appendSecureFile(
  filePath: string,
  data: string | NodeJS.ArrayBufferView,
): void {
  const existed = fs.existsSync(filePath);
  fs.appendFileSync(filePath, data, { mode: 0o600 });
  if (!existed) restrictFilePermissions(filePath);
}

/**
 * `mkdir -p` with owner-only directory permissions, cross-platform.