"dotnet cache" --framework-version option should default from <RuntimeFrameworkVersion> in the proj file

Create a project file that has the Packages you want to cache. For example:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <RuntimeFrameworkVersion>2.0.0-beta-001682-00</RuntimeFrameworkVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="1.3.0" />
    <PackageReference Include="Libuv" Version="1.9.1" />
  </ItemGroup>
</Project>

dotnet cache --entries CacheStuff.csproj -r win10-x64

Expected Results

The command succeeds

Actual Results

The RuntimeFrameworkVersion (which is used for all other commands to specify the Microsoft.NETCore.App version) is not respected.

Restoring packages for C:\Users\eerhardt\AppData\Local\Temp\owyfsgzn.y2x\Optimize\OptimizeCrossgen_win10-x64_netcoreapp2.0.csproj...
F:\dotnet\sdk\2.0.0-preview1-005383\NuGet.targets(97,5): error : Unable to resolve 'Microsoft.NETCore.App (>= 2.0.0)' for '.NETCoreApp,Version=v2.0'. [C:\Users\eerhardt\AppData\Local\Temp\owyfsgzn.y2x\Optimize\OptimizeCrossgen_win10-x64_netcoreapp2.0.csproj]
F:\dotnet\sdk\2.0.0-preview1-005383\NuGet.targets(97,5): error : Unable to resolve 'Microsoft.NETCore.App (>= 2.0.0)' for '.NETCoreApp,Version=v2.0 (win10-x64)'. [C:\Users\eerhardt\AppData\Local\Temp\owyfsgzn.y2x\Optimize\OptimizeCrossgen_win10-x64_netcoreapp2.0.csproj]

Notes

If I repeat myself on the command line by passing in --framework-version 2.0.0-beta-001682-00, it works.

/cc @gkhanna79 @blackdwarf

[eerhardt]

Yes. See https://github.com/dotnet/sdk/commit/91ff2017b3ac427ea13f7f5f5ad66d93a7ddba82 https://github.com/dotnet/cli/commit/a48f3a6bbff4a818f13255b739d67ce2684d10bf

[nguerrera]

My hope is that we completely remove FX_Version, and just map --framework-version to RuntimeFrameworkVersion.

Is this done?