Installation path differs from install path when using PackagePathResolver in .NET 8

[koma-tompit]

NuGet Product Used

NuGet SDK

Product Version

NuGet.Packaging: 6.8.0.131, Dotnet info: Host: Version: 8.0.0 Architecture: x64 Commit: 5535e31a71 RID: linux-x64 .NET SDKs installed: No SDKs were found. .NET runtimes installed: Microsoft.AspNetCore.App 8.0.0 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 8.0.0 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Worked before?

Works fine with .NET 7.0.14

Impact

I'm unable to use this version

Repro Steps & Context

Relevant code:

var packageExtractionContext = new PackageExtractionContext(PackageSaveMode.Defaultv3, XmlDocFileSaveMode.None, null, Logger);
var frameworkReducer = new FrameworkReducer();
var result = new PackageDescriptor();
IEnumerable<SourcePackageDependencyInfo> packages = new List<SourcePackageDependencyInfo>(); //Is actually a function parameter, filled with dependencies
var RootPath = "/home/user/packages/";

foreach (var installer in packages)
{
  PackageReaderBase packageReader;

  var installedPath = PathResolver.GetInstalledPath(installer);
  
  if (string.IsNullOrEmpty(installedPath)) //In this case, always returns null, as packages are not installed
  {
    var downloadResource = await installer.Source.GetResourceAsync<DownloadResource>(CancellationToken.None);
    var downloadResult = await downloadResource.GetDownloadResourceResultAsync(installer, new PackageDownloadContext(CacheContext), RootDirectory, Logger, CancellationToken.None);
  
    packageReader = downloadResult.PackageReader;
  }
  else
    packageReader = new PackageFolderReader(installedPath);
  
  //PathResolver.GetInstallPath(installer) returns a path I cannot access at the moment, for example /home/user/packages/Newtonsoft.Json/3.0.5/
  //The actual path on the drive is /home/user/packages/newtonsoft.json/3.0.5/
  var folder = Path.Combine(PathResolver.GetInstallPath(installer), installer.Version.ToString());
  //The code then proceeds to extract dlls by using the folder and some other parameters. As the folder is invalid, the application crashes
}

I made a workaround for this in our resolver, where I replace the package id in the path with a lowercase version, which temporarily resolved the issue when using packages to compile c# scripts in runtime.

The problem is the Razor view resolver, which is out of reach of modification and complains of the same error:

Cannot find compilation library location for package 'System.Security.Cryptography.Pkcs' at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths(ICompilationAssemblyResolver resolver, List`1 assemblies) at Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths() ...

This happens when compiling a razor view at runtime which is dependant on a NuGet package.

What I find strange is that this appears to work under Windows and a WSL2 Debian installation, and in docker using mcr.microsoft.com/dotnet/aspnetcore:7.0, but consistently crashes in docker, using the mcr.microsoft.com/dotnet/aspnetcore:8.0 image. The only difference there being the project sdk versions, so one built with .NET 7 and the latter, crashing one, with .NET 8.

Verbose Logs

No response

[nkolev92]

Can you try using VersionFolderPathResolver?

VersionFolderPathResolver is what's used for the global packages folder.