PosixFilesystemLinkFactory.cs

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using System;
using System.IO.Abstractions;
using System.Threading;
using System.Threading.Tasks;
 
using Mono.Unix;
 
namespace Tgstation.Server.Host.IO
{
    sealed class PosixFilesystemLinkFactory : IFilesystemLinkFactory
    {
        public bool SymlinkedDirectoriesAreDeletedAsFiles => true;
 
        readonly IFileSystem fileSystem;
 
        public PosixFilesystemLinkFactory(IFileSystem fileSystem)
        {
            this.fileSystem = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
        }
 
        public Task CreateHardLink(string targetPath, string linkPath, CancellationToken cancellationToken) => Task.Factory.StartNew(
            () =>
            {
                ArgumentNullException.ThrowIfNull(targetPath);
                ArgumentNullException.ThrowIfNull(linkPath);
 
                cancellationToken.ThrowIfCancellationRequested();
                var fsInfo = new UnixFileInfo(targetPath);
                cancellationToken.ThrowIfCancellationRequested();
                fsInfo.CreateLink(linkPath);
            },
            cancellationToken,
            DefaultIOManager.BlockingTaskCreationOptions,
            TaskScheduler.Current);
 
        public Task CreateSymbolicLink(string targetPath, string linkPath, CancellationToken cancellationToken) => Task.Factory.StartNew(
            () =>
            {
                ArgumentNullException.ThrowIfNull(targetPath);
                ArgumentNullException.ThrowIfNull(linkPath);
 
                UnixFileSystemInfo fsInfo;
                var isFile = fileSystem.File.Exists(targetPath);
                cancellationToken.ThrowIfCancellationRequested();
                if (isFile)
                    fsInfo = new UnixFileInfo(targetPath);
                else
                    fsInfo = new UnixDirectoryInfo(targetPath);
                cancellationToken.ThrowIfCancellationRequested();
                fsInfo.CreateSymbolicLink(linkPath);
            },
            cancellationToken,
            DefaultIOManager.BlockingTaskCreationOptions,
            TaskScheduler.Current);
    }
}