download required oscdimg.exe as first step

tiny11maker.ps1

@@ -107,6 +107,36 @@ $Host.UI.RawUI.WindowTitle = "Tiny11 image creator"
 Clear-Host
 Write-Output "Welcome to the tiny11 image creator! Release: 09-07-25"
 
+# Download/check the oscdimg tool first, so the build doesn't fail after hours of work
+# if no internet is available at that moment.
+Write-Output "Checking for prerequisite oscdimg.exe..."
+$ADKDepTools = "C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Deployment Tools\$hostarchitecture\Oscdimg"
+$localOSCDIMGPath = "$PSScriptRoot\oscdimg.exe"
+
+if ([System.IO.Directory]::Exists($ADKDepTools)) {
+    Write-Output "Will be using oscdimg.exe from system ADK."
+    $OSCDIMG = "$ADKDepTools\oscdimg.exe"
+} else {
+    Write-Output "ADK folder not found. Creating/Using local copy of oscdimg.exe."
+    $url = "https://msdl.microsoft.com/download/symbols/oscdimg.exe/3D44737265000/oscdimg.exe"
+
+    if (-not (Test-Path -Path $localOSCDIMGPath)) {
+        Write-Output "Downloading oscdimg.exe..."
+        Invoke-WebRequest -Uri $url -OutFile $localOSCDIMGPath
+
+        if (Test-Path $localOSCDIMGPath) {
+            Write-Output "oscdimg.exe downloaded successfully."
+        } else {
+            Write-Error "Failed to download oscdimg.exe."
+            exit 1
+        }
+    } else {
+        Write-Output "oscdimg.exe already exists locally."
+    }
+
+    $OSCDIMG = $localOSCDIMGPath
+}
+
 $hostArchitecture = $Env:PROCESSOR_ARCHITECTURE
 New-Item -ItemType Directory -Force -Path "$ScratchDisk\tiny11\sources" | Out-Null
 do {
@@ -439,32 +469,6 @@ Write-Output "The tiny11 image is now completed. Proceeding with the making of t
 Write-Output "Copying unattended file for bypassing MS account on OOBE..."
 Copy-Item -Path "$PSScriptRoot\autounattend.xml" -Destination "$ScratchDisk\tiny11\autounattend.xml" -Force | Out-Null
 Write-Output "Creating ISO image..."
-$ADKDepTools = "C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Deployment Tools\$hostarchitecture\Oscdimg"
-$localOSCDIMGPath = "$PSScriptRoot\oscdimg.exe"
-
-if ([System.IO.Directory]::Exists($ADKDepTools)) {
-    Write-Output "Will be using oscdimg.exe from system ADK."
-    $OSCDIMG = "$ADKDepTools\oscdimg.exe"
-} else {
-    Write-Output "ADK folder not found. Will be using bundled oscdimg.exe."
-    $url = "https://msdl.microsoft.com/download/symbols/oscdimg.exe/3D44737265000/oscdimg.exe"
-
-    if (-not (Test-Path -Path $localOSCDIMGPath)) {
-        Write-Output "Downloading oscdimg.exe..."
-        Invoke-WebRequest -Uri $url -OutFile $localOSCDIMGPath
-
-        if (Test-Path $localOSCDIMGPath) {
-            Write-Output "oscdimg.exe downloaded successfully."
-        } else {
-            Write-Error "Failed to download oscdimg.exe."
-            exit 1
-        }
-    } else {
-        Write-Output "oscdimg.exe already exists locally."
-    }
-
-    $OSCDIMG = $localOSCDIMGPath
-}
 
 & "$OSCDIMG" '-m' '-o' '-u2' '-udfver102' "-bootdata:2#p0,e,b$ScratchDisk\tiny11\boot\etfsboot.com#pEF,e,b$ScratchDisk\tiny11\efi\microsoft\boot\efisys.bin" "$ScratchDisk\tiny11" "$PSScriptRoot\tiny11.iso"
 
@@ -477,8 +481,6 @@ Remove-Item -Path "$ScratchDisk\scratchdir" -Recurse -Force | Out-Null
 Write-Output "Ejecting Iso drive"
 Get-Volume -DriveLetter $DriveLetter[0] | Get-DiskImage | Dismount-DiskImage
 Write-Output "Iso drive ejected"
-Write-Output "Removing oscdimg.exe..."
-Remove-Item -Path "$PSScriptRoot\oscdimg.exe" -Force -ErrorAction SilentlyContinue
 Write-Output "Removing autounattend.xml..."
 Remove-Item -Path "$PSScriptRoot\autounattend.xml" -Force -ErrorAction SilentlyContinue
 
@@ -505,17 +507,6 @@ if (Test-Path -Path "$ScratchDisk\scratchdir") {
 } else {
     Write-Output "scratchdir folder does not exist. No action needed."
 }
-if (Test-Path -Path "$PSScriptRoot\oscdimg.exe") {
-    Write-Output "oscdimg.exe still exists. Attempting to remove it again..."
-    Remove-Item -Path "$PSScriptRoot\oscdimg.exe" -Force -ErrorAction SilentlyContinue
-    if (Test-Path -Path "$PSScriptRoot\oscdimg.exe") {
-        Write-Output "Failed to remove oscdimg.exe."
-    } else {
-        Write-Output "oscdimg.exe removed successfully."
-    }
-} else {
-    Write-Output "oscdimg.exe does not exist. No action needed."
-}
 if (Test-Path -Path "$PSScriptRoot\autounattend.xml") {
     Write-Output "autounattend.xml still exists. Attempting to remove it again..."
     Remove-Item -Path "$PSScriptRoot\autounattend.xml" -Force -ErrorAction SilentlyContinue