Performs the final steps of config initialization.

def FinalizeConfigInit(config,
                       token,
                       admin_password = None,
                       redownload_templates = False,
                       repack_templates = True,
                       prompt = True):
  """Performs the final steps of config initialization."""
  config.Set("Server.initialized", True)
  print("\nWriting configuration to %s." % config["Config.writeback"])
  config.Write()
  print("Initializing the datastore.")
  # Reload the config and initialize the GRR database.
  server_startup.Init()

  print("\nStep 3: Adding GRR Admin User")
  try:
    CreateUser("admin", password=admin_password, is_admin=True)
  except UserAlreadyExistsError:
    if prompt:
      # pytype: disable=wrong-arg-count
      if ((builtins.input("User 'admin' already exists, do you want to "
                          "reset the password? [yN]: ").upper() or "N") == "Y"):
        UpdateUser("admin", password=admin_password, is_admin=True)
      # pytype: enable=wrong-arg-count
    else:
      UpdateUser("admin", password=admin_password, is_admin=True)

  print("\nStep 4: Repackaging clients with new configuration.")
  if prompt:
    redownload_templates = RetryBoolQuestion(
        "Server debs include client templates. Re-download templates?", False)
    repack_templates = RetryBoolQuestion("Repack client templates?", True)
  if redownload_templates:
    InstallTemplatePackage()
  # Build debug binaries, then build release binaries.
  if repack_templates:
    repacking.TemplateRepacker().RepackAllTemplates(upload=True, token=token)
  print("\nGRR Initialization complete! You can edit the new configuration "
        "in %s.\n" % config["Config.writeback"])
  print("Please restart the service for the new configuration to take "
        "effect.\n")