Add emsdk Manifest-only build to VMR (#15371)

eng/Version.Details.xml

@@ -170,6 +170,7 @@
     <Dependency Name="Microsoft.NET.Workload.Emscripten.Current.Manifest-8.0.100-preview.2" Version="8.0.0-preview.2.23081.3">
       <Uri>https://github.com/dotnet/emsdk</Uri>
       <Sha>1d9df3320ccdb0bbc40a31314641e1100369745b</Sha>
+      <SourceBuild RepoName="emsdk" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.NET.Workload.Emscripten.net7.Manifest-8.0.100-preview.2" Version="8.0.0-preview.2.23081.3">
       <Uri>https://github.com/dotnet/emsdk</Uri>

src/SourceBuild/content/repo-projects/emsdk.proj

@@ -0,0 +1,31 @@
+<Project>
+  <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
+
+  <PropertyGroup>
+    <OverrideTargetRid>$(TargetRid)</OverrideTargetRid>
+    <OverrideTargetRid Condition="'$(TargetOS)' == 'OSX'">osx-$(Platform)</OverrideTargetRid>
+    <OverrideTargetRid Condition="'$(TargetOS)' == 'FreeBSD'">freebsd-$(Platform)</OverrideTargetRid>
+    <OverrideTargetRid Condition="'$(TargetOS)' == 'Windows_NT'">win-$(Platform)</OverrideTargetRid>
+
+    <_platformIndex>$(OverrideTargetRid.LastIndexOf('-'))</_platformIndex>
+    <TargetOS>$(NETCoreSdkRuntimeIdentifier.Substring(0, $(_platformIndex)))</TargetOS>
+    <TargetArch>$(NETCoreSdkPortableRuntimeIdentifier.Substring($(_platformIndex)))</TargetArch>
+
+    <BuildCommandArgs>$(StandardSourceBuildArgs)</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:PackageRid=$(OverrideTargetRid)</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:AssetManifestOS=$(TargetOS)</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:PlatformName=$(TargetArch)</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:ForceBuildManifestOnly=true</BuildCommandArgs>
+    <BuildCommand>$(StandardSourceBuildCommand) $(BuildCommandArgs)</BuildCommand>
+
+    <GlobalJsonFile>$(ProjectDirectory)global.json</GlobalJsonFile>
+    <NuGetConfigFile>$(ProjectDirectory)NuGet.config</NuGetConfigFile>
+    <OutputPlacementRepoApiImplemented>false</OutputPlacementRepoApiImplemented>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <UseSourceBuiltSdkOverride Include="@(ArcadeSdkOverride)" />
+  </ItemGroup>
+
+  <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
+</Project>

src/SourceBuild/content/repo-projects/installer.proj

@@ -60,6 +60,7 @@
   <ItemGroup>
     <RepositoryReference Include="arcade" />
     <RepositoryReference Include="aspnetcore" />
+    <RepositoryReference Include="emsdk" />
     <RepositoryReference Include="fsharp" />
     <RepositoryReference Include="msbuild" />
     <RepositoryReference Include="source-build-externals" />

src/SourceBuild/content/repo-projects/known-good.proj

@@ -34,6 +34,7 @@
         <!-- Tier 1 -->
         <RepositoryReference Include="command-line-api" />
         <RepositoryReference Include="diagnostics" />
+        <RepositoryReference Include="emsdk" />
         <RepositoryReference Include="razor" />
         <RepositoryReference Include="xliff-tasks" />
         <RepositoryReference Include="runtime" />

src/VirtualMonoRepo/source-mappings.json

@@ -75,6 +75,10 @@
             "name": "diagnostics",
             "defaultRemote": "https://github.com/dotnet/diagnostics"
         },
+        {
+            "name": "emsdk",
+            "defaultRemote": "https://github.com/dotnet/emsdk"
+        },
         {
             "name": "format",
             "defaultRemote": "https://github.com/dotnet/format"