Please consider adding AOT support for .Diff.Compare<T>()

Commencez par le projet console .NET 8 et sa configuration aot-test.csproj/Program.cs, puis reproduisez l’échec avec dotnet publish et repo.Diff.Compare(commit1.Tree, commit2.Tree). C’est terminé lorsque l’exécutable AOT natif termine l’appel de diff et signale une modification de diff au lieu de lever NullReferenceException.

When utilizing libgit2sharp in combination with the .NET 8 PublishAot feature, all repository creation, file staging and committing operations are successful, however, the git diff function throws a NullReferenceException.

Is there a way to get this working under AOT?

Steps To Reproduce:

1. Create a .NET 8 console project

   dotnet new console -o aot-test
   cd aot-test
   

2. Adjust aot-test.csproj to include libgit2sharp reference and activate PublishAot feature

   <Project Sdk="Microsoft.NET.Sdk">
   
     <PropertyGroup>
   	<OutputType>Exe</OutputType>
   	<TargetFramework>net8.0</TargetFramework>
   	<RootNamespace>aot_test</RootNamespace>
   	<ImplicitUsings>enable</ImplicitUsings>
   	<Nullable>enable</Nullable>
   	<PublishAot>true</PublishAot>
     </PropertyGroup>
   
     <ItemGroup>
   	<PackageReference Include="libgit2sharp" Version="0.29.0" />
     </ItemGroup>
   
   </Project>
   

3. Insert the following code into Progmram.cs:

using LibGit2Sharp;

var path = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
Directory.CreateDirectory(path);
Repository.Init(path, false);
var userName = "Tester";
var email = "tester@mail.net";
Func<Signature> getSignature = () => new Signature(userName, email, DateTimeOffset.Now);
using (var repo = new Repository(path))
{
    var fileName = "test.txt";
    var filePath = Path.Combine(path, fileName);
    File.WriteAllText(filePath, "Hello, World!");
    Commands.Stage(repo, fileName);
    var commit1 = repo.Commit("Initial commit", getSignature(), getSignature());
    File.AppendAllText(filePath, "\nAppended Line");
    Commands.Stage(repo, fileName);
    var commit2 = repo.Commit("Second commit", getSignature(), getSignature());
    Console.WriteLine($"Commits Count {repo.Commits.Count()}");
    var changes = repo.Diff.Compare<Patch>(commit1.Tree, commit2.Tree);
    Console.WriteLine($"Diff Changes Count = {changes.Count()}");
}

4. Use dotnet run for testing, it will display:

Commits Count 2
Diff Changes Count = 1

5. Use dotnet publish, .\bin\Release\net8.0\win-x64\publish\aot-test.exe to test the native AOT version, it throws an exception on repo.Diff.Compare<Patch>():

Commits Count 2
Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at aot-test!<BaseAddress>+0x19af4c
   at aot-test!<BaseAddress>+0x199437

Current Behavior:

The native AOT functions for repository creation, file staging, and committing operations are functional, but the git diff function is not.

Anticipated Behavior:

Please consider adding AOT support for the git diff API.

Version of LibGit2Sharp (release number or SHA1)

0.29.0

Operating system(s) tested; .NET runtime tested

• OS: Windows 11
• .NET: 8.0.100