/*
 * 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
 *
 *      https://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 org.apache.commons.lang3;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;

/**
 * Helps query the runtime environment.
 *
 * @since 3.15.0
 */
public class RuntimeEnvironment {

    private static boolean fileExists(final String path) {
        return Files.exists(Paths.get(path));
    }

    /**
     * Tests whether we are running in a container like Docker or Podman.
     * <p>
     * <em>The following may change if we find better detection logic.</em>
     * </p>
     * <p>
     * We roughly follow the logic in SystemD:
     * </p>
     * <p>
     * <a href=
     * "https://github.com/systemd/systemd/blob/0747e3b60eb4496ee122066c844210ce818d76d9/src/basic/virt.c#L692">https://github.com/systemd/systemd/blob/0747e3b60eb4496ee122066c844210ce818d76d9/src/basic/virt.c#L692</a>
     * </p>
     * <p>
     * We check the `container` environment variable of process 1:
