duplicati/Duplicati/Library/Common/IO/SystemIO.cs

// Copyright (C) 2024, The Duplicati Team
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// 
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// copy of this software and associated documentation files (the "Software"), 
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// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
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// 
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
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using System;
using System.Runtime.Versioning;
namespace Duplicati.Library.Common.IO
{
    public static class SystemIO
    {

        /// <summary>
        /// A cached lookup for windows methods for dealing with long filenames
        /// </summary>
        [SupportedOSPlatform("windows")]
        public static readonly ISystemIO IO_WIN;

        [SupportedOSPlatform("linux")]
        [SupportedOSPlatform("macOS")]
        public static readonly ISystemIO IO_SYS;

        public static readonly ISystemIO IO_OS;

        static SystemIO()
        {
            // TODO: These interfaces cannot be properly guarded by the supported platform attribute in this form.
            // They are used in static methods of USNJournal on all platforms.
            IO_WIN = new SystemIOWindows();
            IO_SYS = new SystemIOLinux();
            if (OperatingSystem.IsWindows())
            {
                IO_OS = IO_WIN;
            }
            else if (OperatingSystem.IsMacOS() || OperatingSystem.IsLinux())
            {
                IO_OS = IO_SYS;
            }
        }
    }
}