JarUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package redis.embedded.util;

import org.apache.commons.io.FileUtils;

import com.google.common.io.Resources;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

/** Utility class for extracting executables from JAR files. */
public class JarUtil {

  private JarUtil() {
    // Utility class should not be instantiated
  }

  public static File extractExecutableFromJar(String executable) throws IOException {
    File tmpDir = Files.createTempDirectory("redis-").toFile();
    tmpDir.deleteOnExit();

    // On newer versions of macOS, the temporary directory /var/folders does not
    // support executing binary files with a .app extension, which prevents Redis
    // from starting. To ensure Redis runs correctly, the redis-server binary is
    // uniformly renamed to redis-server.
    String executableName = "redis-server";
    File command = new File(tmpDir, executableName);
    FileUtils.copyURLToFile(Resources.getResource(executable), command);
    command.deleteOnExit();
    command.setExecutable(true);

    return command;
  }
}