"double forward slashes in path" when uploading package

[bruno-garcia]

NuGet Product Used

dotnet.exe

Product Version

Happens on nuget.org

Worked before?

No response

Impact

I'm unable to use this version

Repro Steps & Context

When trying to upload Sentry's .NET SDK, 1 package fails NuGet validation.

Validation fails via the CLI as well as via nuget.org

I'm hitting this: https://github.com/NuGet/NuGetGallery/blob/0ec99618043ae7f7e54a3ed8fdbbb47acc5e30b1/src/NuGetGallery/Controllers/ApiController.cs#L567

But what's confusing to me is that the file that supposedly has double backslash is:

<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup>
    <ProguardConfiguration Include="$(MSBuildThisFileDirectory)..\..\proguard.cfg" />
  </ItemGroup>
</Project>

The difference is that we're packing with .NET 9 SDK on this release, instead of .NET 8.

When I see a package that worked (Sentry.Bindings.Android.4.12.1-segv1.zip
), built with .NET 8, the output has:

vs the new one, .NET 9 which fails to upload ( Sentry.Bindings.Android.5.0.0-alpha.0.zip):

Verbose Logs

No response

[bruno-garcia]

Diff between versions did have change in packaging: getsentry/publish#4649 (comment)

We reverted that and will attempt a new release. I'll close this as it's very likely related to that