[release/6.0] Apply source build patches (backport) (#8384)

* Build Microsoft.DotNet.Build.Tasks.Workloads for net6.0

* workaround for hardcoded DotNetSharedFrameworkTaskDir

* don't use obsolete managed SHA256 class

* Disable Workloads WiX dependency in source-build

This removes the prebuilt WiX dependency: #8014

The patch is temporary, pending upstream fix and dependency flow.

Co-authored-by: Michael Simons <msimons@microsoft.com>
Co-authored-by: Davis Goodin <dagood@microsoft.com>

src/Microsoft.DotNet.Build.Tasks.Workloads/src/Microsoft.DotNet.Build.Tasks.Workloads.csproj

@@ -2,6 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net472;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">net6.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <LangVersion>Latest</LangVersion>
     <IsPackable>true</IsPackable>
@@ -11,6 +12,16 @@
     <NoWarn>$(NoWarn);NU5127</NoWarn>
     <EnableDefaultNoneItems>false</EnableDefaultNoneItems>
     <RootNamespace>Microsoft.DotNet.Build.Tasks.Workloads</RootNamespace>
+
+    <!--
+      Only include WiX-powered features when running a non-from-source build. (For example, the
+      Microsoft build used to build .NET for Windows.)
+
+      This removes a dependency on prebuilt WiX binaries. The purpose of WiX is to produce Windows
+      installers, and source-build doesn't run on Windows, so excluding WiX while building in
+      source-build mode to remove the prebuilt dependency has no impact to available .NET features.
+    -->
+    <IncludeWiX Condition="'$(DotNetBuildFromSource)' != 'true'">true</IncludeWiX>
   </PropertyGroup>
 
   <ItemGroup>
@@ -19,13 +30,16 @@
     <PackageReference Include="Microsoft.Build.Tasks.Core" Version="$(MicrosoftBuildTasksCoreVersion)" />
     <PackageReference Include="Microsoft.Build.Framework" Version="$(MicrosoftBuildFrameworkVersion)" />
     <PackageReference Include="NuGet.Packaging" Version="$(NuGetVersion)" />
-    <PackageReference Include="Wix" Version="3.11.2" />
     <PackageReference Include="Microsoft.NET.Sdk.WorkloadManifestReader" Version="$(MicrosoftNetSdkWorkloadManifestReaderVersion)" />
-    <PackageReference Include="System.Text.Json" Version="$(SystemTextJsonVersion)" Condition="'$(TargetFramework)' == 'net472'"/>
+    <PackageReference Include="System.Text.Json" Version="$(SystemTextJsonVersion)" Condition="'$(TargetFramework)' == 'net472'" />
     <PackageReference Include="Microsoft.Deployment.DotNet.Releases" Version="$(MicrosoftDeploymentDotNetReleasesVersion)" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(IncludeWiX)' == 'true'">
+    <PackageReference Include="Wix" Version="3.11.2" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(IncludeWiX)' == 'true'">
     <Reference Include="$(WixInstallPath)\Microsoft.Deployment.Resources.dll" />
     <Reference Include="$(WixInstallPath)\Microsoft.Deployment.Compression.dll" />
     <Reference Include="$(WixInstallPath)\Microsoft.Deployment.Compression.Cab.dll" />
@@ -48,6 +62,10 @@
     <EmbeddedResource Remove="obj\**" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(IncludeWiX)' != 'true'">
+    <Compile Remove="**\*.wix.cs" />
+  </ItemGroup>
+
   <ItemGroup>
     <EmbeddedResource Include="Misc\*.*" />
     <EmbeddedResource Include="MsiTemplate\*.wxs" />

src/Microsoft.DotNet.Build.Tasks.Workloads/src/Utils.cs

@@ -122,7 +122,7 @@ public static Guid CreateUuid(Guid namespaceUuid, string name)
             Buffer.BlockCopy(nameBytes, 0, hashBuffer, 16, nameBytes.Length);
             byte[] hash;
 
-            using (SHA256 sha256 = new SHA256Managed())
+            using (SHA256 sha256 = SHA256.Create())
             {
                 hash = sha256.ComputeHash(hashBuffer);
             }

src/Microsoft.DotNet.SharedFramework.Sdk/sdk/Sdk.props

@@ -10,6 +10,9 @@
   <PropertyGroup Condition="'$(DotNetSharedFrameworkTaskDir)' == ''">
     <DotNetSharedFrameworkTaskDir Condition="'$(MSBuildRuntimeType)' == 'core'">$(MSBuildThisFileDirectory)../tools/netcoreapp3.1/</DotNetSharedFrameworkTaskDir>
     <DotNetSharedFrameworkTaskDir Condition="'$(MSBuildRuntimeType)' != 'core'">$(MSBuildThisFileDirectory)../tools/net472/</DotNetSharedFrameworkTaskDir>
+
+    <!-- Workaround for https://github.com/dotnet/arcade/issues/7413 -->
+    <DotNetSharedFrameworkTaskDir Condition="'$(MSBuildRuntimeType)' == 'core' and '$(DotNetBuildFromSource)' == 'true'">$(MSBuildThisFileDirectory)../tools/net6.0/</DotNetSharedFrameworkTaskDir>
   </PropertyGroup>
 
   <PropertyGroup>