dotnet main fails to source-build roslyn due to not finding razor assets

[tmds]

Since mid/end last week our CI builds have started failing:

  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.AspNetCore.Razor.Utilities.Shared/Release/net11.0/Microsoft.AspNetCore.Razor.Utilities.Shared.dll" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Razor.Workspaces/Release/net11.0/Microsoft.CodeAnalysis.Razor.Workspaces.dll" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Razor.Workspaces/Release/net11.0/Microsoft.CodeAnalysis.Razor.Workspaces.xml" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Remote.Razor/Release/net11.0/Microsoft.CodeAnalysis.Remote.Razor.dll" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Remote.Razor/Release/net11.0/Microsoft.CodeAnalysis.Remote.Razor.xml" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.AspNetCore.Razor.Utilities.Shared/Release/net11.0/Microsoft.AspNetCore.Razor.Utilities.Shared.xml" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Razor.Compiler/Release/net11.0/Microsoft.CodeAnalysis.Razor.Compiler.dll" because it was not found.
  /home/tester/workdir/dotnet/src/roslyn/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj(60,5): error MSB3030: Could not copy the file "/home/tester/workdir/dotnet/src/roslyn/artifacts/bin/Microsoft.CodeAnalysis.Razor.Compiler/Release/net11.0/Microsoft.CodeAnalysis.Razor.Compiler.pdb" because it was not found.

The errors come from this target: https://github.com/dotnet/roslyn/blob/62d30e93ce06a9a14d2a38e407b085aea5d83f0b/src/Razor/src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Microsoft.VisualStudioCode.RazorExtension.csproj#L47.

Based on the name/description, probably this target should be skipped during sourcebuild.

cc @davidwengier @ViktorHofer @mthalman @omajid

[omajid]

Meta-question: how did this get merged into the VMR given that it breaks builds?

[tmds]

I guess it might be due to project that produces them does get build, but the one that consumes them doesn't depend on that project. That causes the order between the projects to vary between builds, causing some to pass and some to fail.