Do not build redist tarball in source build

Author: John Luo

eng/Build.props

@@ -121,7 +121,6 @@
           Use caution to avoid deep recursion. If the globbing pattern picks up something which exceeds MAX_PATH,
           the entire pattern will silently fail to evaluate correctly.
         -->
-
         <DotNetProjects Include="
                           $(RepoRoot)src\Framework\ref\Microsoft.AspNetCore.App.Ref.csproj;
                           $(RepoRoot)src\Framework\src\Microsoft.AspNetCore.App.Runtime.csproj;

src/Framework/src/Microsoft.AspNetCore.App.Runtime.csproj

@@ -363,18 +363,12 @@ This package is an internal implementation of the .NET Core SDK and is not meant
   Targets related to creating .zip/.tar.gz
   #########################################
   -->
-  <Target Name="_DownloadAndExtractDotNetRuntime">
-    <!-- Download dotnet runtime from web when not building from source -->
-    <DownloadFile Condition=" ! Exists('$(DotNetRuntimeArchive)') and '$(DotNetRuntimeArchiveSource)' == ''"
+  <Target Name="_DownloadAndExtractDotNetRuntime" Condition="'$(DotNetBuildFromSource)' != 'true'">
+    <DownloadFile Condition=" ! Exists('$(DotNetRuntimeArchive)')"
       SourceUrl="$(DotNetRuntimeDownloadUrl)$(DotNetAssetRootAccessTokenSuffix)"
       DestinationFolder="$(BaseIntermediateOutputPath)"
       DestinationFileName="$(DotNetRuntimeArchiveFileName)" />
 
-    <!-- Copy from corefx build output when building from source -->
-    <Copy Condition="! Exists('$(DotNetRuntimeArchive)') and '$(DotNetRuntimeArchiveSource)' != ''"
-          SourceFiles="$(DotNetRuntimeArchiveSource)"
-          DestinationFiles="$(BaseIntermediateOutputPath)$(DotNetRuntimeArchiveFileName)" />
-
     <!-- Extract the dotnet-runtime archive -->
     <Exec Condition="'$(ArchiveExtension)' == '.tar.gz'"
       Command="tar -xzf $(DotNetRuntimeArchive) -C $(RedistSharedFrameworkLayoutRoot)" />
@@ -447,7 +441,8 @@ This package is an internal implementation of the .NET Core SDK and is not meant
       Condition="'$(ArchiveExtension)' == '.tar.gz'" />
   </Target>
 
-  <Target Name="_CreateRedistSharedFxArchive"
+  <Target Condition="'$(DotNetBuildFromSource)' != 'true'"
+          Name="_CreateRedistSharedFxArchive"
           Inputs="@(SharedFxContent)"
           Outputs="$(RedistArchiveOutputPath)">
     <Message Importance="High" Text="$(MSbuildProjectFile) -> $(RedistArchiveOutputPath)" />