/*
    * Copyright 2024 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.util.platform.linux;
   
   import java.io.File;
   
   import oshi.annotation.concurrent.ThreadSafe;
  import oshi.util.GlobalConfig;
  
  /**
   * Provides constants for paths in the {@code /dev} filesystem on Linux.
   * <p>
   * If the user desires to configure a custom {@code /dev} path, it must be declared in the OSHI configuration file or
   * updated in the {@link GlobalConfig} class prior to initializing this class.
   */
  @ThreadSafe
  public final class DevPath {
  
      /**
       * The /dev filesystem location.
       */
      public static final String DEV = queryDevConfig() + "/";
  
      public static final String DISK_BY_UUID = DEV + "disk/by-uuid";
      public static final String DM = DEV + "dm";
      public static final String LOOP = DEV + "loop";
      public static final String MAPPER = DEV + "mapper/";
      public static final String RAM = DEV + "ram";
  
      private DevPath() {
      }
  
      private static String queryDevConfig() {
          String devPath = GlobalConfig.get(GlobalConfig.OSHI_UTIL_DEV_PATH, "/dev");
          // Ensure prefix begins with path separator, but doesn't end with one
          devPath = '/' + devPath.replaceAll("/$|^/", "");
          if (!new File(devPath).exists()) {
              throw new GlobalConfig.PropertyException(GlobalConfig.OSHI_UTIL_DEV_PATH, "The path does not exist");
          }
          return devPath;
      }
  }