MSBuild condition for runtime identifier "family"

[AnthonyMastrean]

So, I'm experimenting with some of the new compile/deploy options. Maybe I want to do something different depending on the runtime identifier that I'm passed. But, I might not really know if I'm going to get win, win-x64, or win7-x64, for example.

<PropertyGroup Condition="'$(RuntimeIdentifier)'=='win-x64'">

Is there anyway to detect the "family" of runtime identifier or to have access to the entire graph in MSBuild?

Are you going to tell me to use a string property function? Would that be reliable? Is this a bad idea?

<PropertyGroup Condition="$(RuntimeIdentifier.StartsWith('win')">

[jeffschwMSFT]

@nguerrera I think this may be more appropriate for dotnet/sdk

[jeffschwMSFT]

Moved to dotnet/sdk#10606