Function existingRegistryAuthFile

packages/container/src/util.ts:279–288

()

 * `vercel build`, where an explicit login is still needed).
 */
export function existingRegistryAuthFile(): string | undefined {
  const explicit = readString(process.env.REGISTRY_AUTH_FILE);
  if (explicit) {
    return existsSync(explicit) ? explicit : undefined;
  }
  const fromXdg = readString(process.env.XDG_CONFIG_HOME);
  const configHome = fromXdg || join(homedir(), '.config');
  const defaultPath = join(configHome, 'containers', 'auth.json');
  return existsSync(defaultPath) ? defaultPath : undefined;
}