PackageValidation task cannot find nuget package due to version normalization

I tried the new SDK feature following the example at https://devblogs.microsoft.com/dotnet/package-validation/#validation-against-baseline-package-version.

I am getting an error from the task complaining the nuget package has not been found: Error MSB4018 The "Microsoft.DotNet.PackageValidation.ValidatePackage" task failed unexpectedly. System.IO.InvalidDataException: The file is not a valid nupkg. File path: bin\Debug\*******.2.0.0.0.nupkg ---> System.IO.FileNotFoundException: Could not find file 'bin\Debug\********.2.0.0.0.nupkg'.

If I look into the bin\Debug folder I see the nuget package file, but it has a normalized version of 2.0.0 although I explicitly set <PackageVersion>2.0.0.0</PackageVersion>.

If change the PackageVersion to either 2.0.0 or 2.0.0.1 it works as expected.

[ViktorHofer]

Thanks for reporting @smkanadl. I just submitted a PR that will fix this by using a similar approach as what @cdonnellytx shared.

[cdonnellytx]

A similar discrepancy in NuGet package filename also occurs if you are using “full” semantic versioning (e.g. PackageVersion=1.2.3-alpha.1+2). The package file generated (at least in Windows, by MSBuild) appears to be bin\Debug\1.2.3-alpha.1.nupkg, not including the +.

I dug into the SDK targets for dotnet (5.0.301, win-x64) and it looks like the first entry in @(NuGetPackOutput) is what is desired, with target _GetOutputItemsFromPack being responsible for what is altering the expected filename.

(I discovered this by using the GitVersion.MsBuild task; the trick is to have unstaged changes out where the currently committed HEAD is not on a tag.)

Update: I found a way to extract it, assuming the output order from GetOutputItemsFromPack is stable and is always xxx.nupkg;xxx.nuspec:

  <Target Name="GetPackageTargetPath" BeforeTargets="RunPackageValidation">
    <ItemGroup>
      <Reversed Include="@(NuGetPackOutput->Reverse())" />
    </ItemGroup>
    <PropertyGroup>
      <PackageTargetPath>%(Reversed.Identity)</PackageTargetPath>
    </PropertyGroup>
<!-- debug dumping out the names for comparison. -->
    <Warning Text="    PackageTargetPath='$(PackageTargetPath)'" />
    <Warning Text="    DEFAULT_PackageTargetPath='$(PackageOutputPath)$(PackageId).$(PackageVersion).nupkg'" />
  </Target>

Reference

• MSBuild Tasks – First item in an item group