Add dry run flag to install Win 10 SDK script

Author: mokagio

.buildkite/pipeline.yml

@@ -124,7 +124,7 @@ steps:
       - label: ":windows: install_windows_10_sdk Tests - Standard version file"
         command: |
           echo '20348' > .windows-10-sdk-version
-          bin/install_windows_10_sdk.ps1
+          bin/install_windows_10_sdk.ps1 -DryRun
         agents:
           queue: windows
         notify:
@@ -134,7 +134,7 @@ steps:
       - label: ":windows: install_windows_10_sdk Tests - Version file with new lines"
         command: |
           echo "20348\n\n" > .windows-10-sdk-version
-          bin/install_windows_10_sdk.ps1
+          bin/install_windows_10_sdk.ps1 -DryRun
         agents:
           queue: windows
         notify:
@@ -144,7 +144,7 @@ steps:
       - label: ":windows: install_windows_10_sdk Tests - Version file with a word"
         command: |
           echo "not an integer" > .windows-10-sdk-version
-          bin/install_windows_10_sdk.ps1
+          bin/install_windows_10_sdk.ps1 -DryRun
         agents:
           queue: windows
         notify:

bin/install_windows_10_sdk.ps1

@@ -1,3 +1,7 @@
+param ( # parameters need to be defined at the top of the script
+  [switch]$DryRun = $false
+)
+
 # Stop script execution when a non-terminating error occurs
 $ErrorActionPreference = "Stop"
 
@@ -27,6 +31,11 @@ if ($windows10SDKVersion -notmatch '^\d+$') {
 
 Write-Host "Will attempt to set up Windows 10 ($windows10SDKVersion) SDK and Visual Studio Build Tools..."
 
+if ($DryRun) {
+  Write-Output "Running in dry run mode, finishing here."
+  exit 0
+}
+
 # Download the Visual Studio Build Tools Bootstrapper
 Write-Output "~~~ Downloading Visual Studio Build Tools..."