Factor out reference assembly installation

Author: lbussell

eng/dockerfile-templates/sdk/Dockerfile

@@ -91,19 +91,7 @@ RUN powershell setx /M PATH $(${Env:PATH} `
     + \";${Env:ProgramFiles(x86)}\Microsoft SDKs\Windows\v10.0A\bin\NETFX {{sdkVersion}} Tools\" `
     + \";${Env:ProgramFiles(x86)}\Microsoft SDKs\ClickOnce\SignTool\")
 
-# Install Targeting Packs
-RUN powershell " `
-    $ErrorActionPreference = 'Stop'; `
-    $ProgressPreference = 'SilentlyContinue'; `
-    @@('4.0', '4.5.2', '4.6.2', '4.7.2', '4.8', '4.8.1') `
-    | %{ `
-        Invoke-WebRequest `
-            -UseBasicParsing `
-            -Uri https://dotnetbinaries.blob.core.windows.net/referenceassemblies/v${_}.zip `
-            -OutFile referenceassemblies.zip; `
-        Expand-Archive referenceassemblies.zip -DestinationPath \"${Env:ProgramFiles(x86)}\Reference Assemblies\Microsoft\Framework\.NETFramework\"; `
-        Remove-Item -Force referenceassemblies.zip; `
-    }"{{
+{{InsertTemplate("Dockerfile.install-refassemblies")}}{{
 if OS_VERSION_NUMBER = "ltsc2019"
 :
 

eng/dockerfile-templates/sdk/Dockerfile.install-refassemblies

@@ -0,0 +1,15 @@
+# Install Targeting Packs
+RUN powershell " `
+    $ErrorActionPreference = 'Stop'; `
+    $ProgressPreference = 'SilentlyContinue'; `
+    {{if OS_VERSION_NUMBER = "ltsc2016"
+        :[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; `
+    }}@@('4.0', '4.5.2', '4.6.2', '4.7.2', '4.8', '4.8.1') `
+    | %{ `
+        Invoke-WebRequest `
+            -UseBasicParsing `
+            -Uri https://dotnetbinaries.blob.core.windows.net/referenceassemblies/v${_}.zip `
+            -OutFile referenceassemblies.zip; `
+        Expand-Archive referenceassemblies.zip -DestinationPath \"${Env:ProgramFiles(x86)}\Reference Assemblies\Microsoft\Framework\.NETFramework\"; `
+        Remove-Item -Force referenceassemblies.zip; `
+    }"

eng/dockerfile-templates/sdk/Dockerfile.ltsc2016

@@ -116,19 +116,6 @@ RUN powershell setx /M PATH $(${Env:PATH} `
     + \";${Env:ProgramFiles(x86)}\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.8 Tools\" `
     + \";${Env:ProgramFiles(x86)}\Microsoft SDKs\ClickOnce\SignTool\")
 
-# Install Targeting Packs
-RUN powershell " `
-    $ErrorActionPreference = 'Stop'; `
-    $ProgressPreference = 'SilentlyContinue'; `
-    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; `
-    @@('4.0', '4.5.2', '4.6.2', '4.7.2', '4.8', '4.8.1') `
-    | %{ `
-        Invoke-WebRequest `
-            -UseBasicParsing `
-            -Uri https://dotnetbinaries.blob.core.windows.net/referenceassemblies/v${_}.zip `
-            -OutFile referenceassemblies.zip; `
-        Expand-Archive referenceassemblies.zip -DestinationPath \"${Env:ProgramFiles(x86)}\Reference Assemblies\Microsoft\Framework\.NETFramework\"; `
-        Remove-Item -Force referenceassemblies.zip; `
-    }"
+{{InsertTemplate("Dockerfile.install-refassemblies")}}
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]