Add dnx scripts to zip layouts

Author: dsplaisted

src/Layout/redist/dnx

@@ -0,0 +1,2 @@
+#!/bin/sh
+"$(dirname "$0")/dotnet" dnx "$@"

src/Layout/redist/dnx.cmd

@@ -0,0 +1,2 @@
+@echo off
+"%~dp0dotnet.exe" dnx %*

src/Layout/redist/targets/GenerateInstallerLayout.targets

@@ -64,6 +64,17 @@
                       Overwrite="true" />
   </Target>
 
+  <Target Name="LayoutDnxScript">
+    <PropertyGroup>
+      <DnxScriptSource Condition="$([MSBuild]::IsOSPlatform('WINDOWS'))">dnx.cmd</DnxScriptSource>
+      <DnxScriptSource Condition="!$([MSBuild]::IsOSPlatform('WINDOWS'))">dnx</DnxScriptSource>
+    </PropertyGroup>
+    <Copy SourceFiles="$(DnxScriptSource)" DestinationFolder="$(RedistInstallerLayoutPath)" />
+
+    <!-- Mark script as executable -->
+    <Exec Command="chmod 644 &quot;$(RedistInstallerLayoutPath)/dnx&quot;" Condition="!$([MSBuild]::IsOSPlatform('Windows'))" />
+  </Target>
+
   <!-- Replace files from the runtime packs with symbolic links to the corresponding shared framework files (and hostfxr) to reduce the size of the runtime pack directories. -->
   <Target Name="ReplaceBundledRuntimePackFilesWithSymbolicLinks" DependsOnTargets="LayoutBundledComponents"
                                                                  Condition="'$(BundleRuntimePacks)' == 'true' and !$([MSBuild]::IsOSPlatform('WINDOWS'))">
@@ -81,6 +92,7 @@
                             LayoutManifests;
                             LayoutBaselineWorkloadSet;
                             LayoutWorkloadUserLocalMarker;
+                            LayoutDnxScript;
                             CrossgenLayout;
                             ReplaceBundledRuntimePackFilesWithSymbolicLinks"
           AfterTargets="AfterBuild" />