using System;

using System.IO;

using System.Linq;

​

using NUnit.Framework.Internal;

​

using ICSharpCode.SharpZipLib.Tar;

​

TarEntry symlinkEntry = new TarEntry(new TarHeader()

{

    Name = "MySymlink",

    Mode = Convert.ToInt32("774", 8),

    TypeFlag = TarHeader.LF_SYMLINK,

    ModTime = DateTime.UtcNow,

    Size = 0,

    LinkName = "MyFile",

});

​

Test(SymlinkWithArchiveClass, symlinkEntry);

Test(SymlinkWithStreamClass, symlinkEntry);

​

// BAD:

// WriteEntry() wants to append file data, which we

// don't have with symlinks. For directories (LF_DIR),

// there is an exemption. I expected one for LF_SYMLINK too.

void SymlinkWithArchiveClass(TarEntry entry) {

    using (var ms = new MemoryStream())

    {

        var ar = TarArchive.CreateOutputTarArchive(ms);

        ar.WriteEntry(entry, false);

        ar.Close();

    }

}

​

// GOOD:

void SymlinkWithStreamClass(TarEntry entry) {

    using var ms = new MemoryStream();

    using (var ts = new TarOutputStream(ms, System.Text.Encoding.UTF8))

    {

        ts.PutNextEntry(entry);

        ts.CloseEntry();

        ts.Close();

    }

}

​

#region Helpers // These are just a helpers to make the results more legible

​

void Test<T>(Action<T> a, T input) 

{

    // Prevent NUnit from grouping exceptions together

    using var ctx = new TestExecutionContext.IsolatedContext();

    Console.WriteLine($"Testing input \"{input}\"...\n");

    try { 

        a(input);

        Console.WriteLine("\n=> OK!");

    }

    catch (Exception x) {

        Console.WriteLine($"\n=> Failed! ({x.GetType().Name})");    

        Console.WriteLine($"\n{x.Message}");

        var trimmedStack = string.Join("\n", x.StackTrace.Split("\n").Where(l => !l.Contains("ReportFailure")));

        Console.WriteLine($"{trimmedStack}");

    }

    Console.WriteLine($"\n{new string('=', 128)}\n");

}

void Log(string message) => Console.WriteLine($"  {message}");

#endregion