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/*
 * Copyright 2017 - 2023 the original author or authors.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/]
 */

package cn.taketoday.buildpack.platform.build;

/**
 * Image pull policy.
 *
 * @author Andrey Shlykov
 * @author Harry Yang
 * @since 4.0
 */
public enum PullPolicy {

  /**
   * Always pull the image from the registry.
   */
  ALWAYS,

  /**
   * Never pull the image from the registry.
   */
  NEVER,

  /**
   * Pull the image from the registry only if it does not exist locally.
   */
  IF_NOT_PRESENT

}