Install Steam on persistent data disk that is never destroyed by terraform

scripts/provision-software.ps1.tpl

@@ -1,3 +1,8 @@
+$ErrorActionPreference = 'Stop'
+
+$DataDiskLun = '${datadisk_lun}'
+$DataDiskDriveLetter = '${datadisk_drive_letter}'
+
 $TailscaleUri = 'https://pkgs.tailscale.com/stable/tailscale-setup-1.88.3-amd64.msi'
 $TailscaleMsi = 'tailscale.msi'
 $TailscaleInstalledExe = 'C:\Program Files\Tailscale\tailscale.exe'
@@ -15,6 +20,20 @@ $SunshineInstallerExe = 'sunshine-installer.exe'
 $SteamInstallerUri = 'https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe'
 $SteamInstallerExe = 'steam-installer.exe'
 
+Write-Host "Setting up data disk"
+
+$DataDisk = Get-Disk | Where-Object { $_.Location -Like "*LUN $DataDiskLun*" }
+if ($DataDisk.PartitionStyle -eq 'raw') {
+    Initialize-Disk -UniqueId $DataDisk.UniqueId -PartitionStyle GPT
+    New-Partition -DiskId $DataDisk.UniqueId -UseMaximumSize -DriveLetter $DataDiskDriveLetter
+    Format-Volume -DriveLetter $DataDiskDriveLetter -FileSystem NTFS -NewFileSystemLabel DataDisk -Confirm:$False
+} else {
+    $Partition = Get-Partition -DiskNumber $DataDisk.DiskNumber | Where-Object { $_.Type -eq "Basic" }
+    Set-Partition -InputObject $Partition -NewDriveLetter $DataDiskDriveLetter
+}
+
+Write-Host "Done setting up data disk"
+
 Write-Host "Provisioning software"
 
 ##
@@ -66,11 +85,17 @@ Write-Host 'Done installing Sunshine, configure at https://localhost:47990/'
 ##
 # Steam
 Write-Host "Installing Steam"
-Write-Host "Downloading Steam installer from $SteamInstallerUri to $SteamInstallerExe"
-Invoke-WebRequest -UseBasicParsing -Uri $SteamInstallerUri -OutFile $SteamInstallerExe
 
-Write-Host "Installing Steam from $SteamInstallerExe"
-Start-Process $SteamInstallerExe -ArgumentList '/S' -Wait -NoNewWindow -PassThru
+if(Test-Path "$($DataDiskDriveLetter):\Steam\Steam.exe") {
+    Write-Host "Steam is already installed, skipping"
+} else {
+    Write-Host "Downloading Steam installer from $SteamInstallerUri to $SteamInstallerExe"
+    Invoke-WebRequest -UseBasicParsing -Uri $SteamInstallerUri -OutFile $SteamInstallerExe
+
+    Write-Host "Installing Steam from $SteamInstallerExe"
+    New-Item -Path "$($DataDiskDriveLetter):\" -Name 'Steam' -ItemType Directory
+    Start-Process $SteamInstallerExe -ArgumentList '/S', "/D=$($DataDiskDriveLetter):\Steam" -Wait -NoNewWindow -PassThru
+}
 
 Write-Host 'Done installing Steam'