SDL fallback, partition fix, lz4 remote streaming, delay-oobe-run

SDL display:
- try SDL, auto-fallback to headless if it fails (no crash)
- SDL_VIDEODRIVER=x11 to avoid wayland socket path issues
- suppress XDG_RUNTIME_DIR warnings

Disk copy:
- zap-all before writing to clear old partition tables
- delete recovery partition (4) before resizing partition 3
- use parted resizepart (preserves partition GUID for BCD)
- remote: nix-shell for sgdisk/parted/ntfsresize on target
- remote: lz4 compression for faster streaming
- remote: pv progress bar with disk size
- -y/--yes flag to skip confirmation prompt

Generalize:
- delay-oobe-run=true defers OOBE + activation to real hardware
- clean cached Autounattend from Windows\Panther before sysprep
- taskkill sysprep.exe on first login (CopyProfile artifact)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/images/windows/helpers/customizeImage.nix

@@ -80,32 +80,36 @@
       chmod +w vars.fd
 
       VMIX_DISPLAY="-nographic"
-      ${lib.optionalString (displayArg != null) ''VMIX_DISPLAY="${displayArg}"''}
-      ${lib.optionalString (displayArg == null) ''
+      ${lib.optionalString (vncDisplay != null) ''VMIX_DISPLAY="-vnc ${vncDisplay}"''}
+      ${lib.optionalString (vncDisplay == null) ''
         VMIX_DF=$(ls -t /tmp/.vmix-display-* 2>/dev/null | head -1)
         if [ -n "$VMIX_DF" ]; then
           export DISPLAY=$(cat "$VMIX_DF")
           export HOME=$(mktemp -d)
           export XDG_RUNTIME_DIR=$HOME
+          export SDL_VIDEODRIVER=x11
           VMIX_DISPLAY="-display sdl"
         fi
       ''}
 
       echo "=== vmix: booting Audit Mode for ${name} ==="
-      timeout 1800 qemu-system-x86_64 \
-        $VMIX_DISPLAY \
-        -accel kvm \
-        -m ${toString memSize} \
-        -smp ${toString smp} \
-        -cpu host \
-        -machine type=q35 \
+      QEMU_ARGS="-accel kvm -m ${toString memSize} -smp ${toString smp} -cpu host -machine type=q35 \
         -drive if=pflash,format=raw,readonly=on,file=${pkgs.OVMF.fd}/FV/OVMF_CODE.fd \
         -drive if=pflash,format=raw,file=vars.fd \
         -rtc base=localtime,clock=host \
         -device qemu-xhci -device usb-tablet \
         -drive file=${resultImg},format=qcow2,if=virtio \
         ${cdromArgs} \
-        -nic user,model=virtio-net-pci
+        -nic user,model=virtio-net-pci"
+
+      timeout 1800 qemu-system-x86_64 $VMIX_DISPLAY $QEMU_ARGS || \
+        if [[ "$VMIX_DISPLAY" == "-display sdl" ]]; then
+          echo "=== vmix: SDL failed, retrying headless ==="
+          cp ${pkgs.OVMF.fd}/FV/OVMF_VARS.fd vars.fd && chmod +w vars.fd
+          timeout 1800 qemu-system-x86_64 -nographic $QEMU_ARGS
+        else
+          exit 1
+        fi
 
       echo "=== vmix: audit script ${name} complete ==="
     '';

lib/images/windows/helpers/makeImage.nix

@@ -53,19 +53,14 @@ let
         export DISPLAY=$(cat "$VMIX_DF")
         export HOME=$(mktemp -d)
         export XDG_RUNTIME_DIR=$HOME
+        export SDL_VIDEODRIVER=x11
         VMIX_DISPLAY="-display sdl"
       fi
     ''}
 
     # Windows installs unattended, reboots into Audit Mode,
     # deletes cached Autounattend, shuts down → QEMU exits.
-    timeout 3600 qemu-system-x86_64 \
-      $VMIX_DISPLAY \
-      -accel kvm \
-      -m ${toString memSize} \
-      -smp ${toString smp} \
-      -cpu host \
-      -machine type=q35 \
+    QEMU_ARGS="-accel kvm -m ${toString memSize} -smp ${toString smp} -cpu host -machine type=q35 \
       -drive if=pflash,format=raw,readonly=on,file=${pkgs.OVMF.fd}/FV/OVMF_CODE.fd \
       -drive if=pflash,format=raw,file=vars.fd \
       -rtc base=localtime,clock=host \
@@ -73,7 +68,16 @@ let
       -drive file=disk.qcow2,format=qcow2,if=virtio \
       -drive file=${iso},media=cdrom,readonly=on \
       -drive file=${drivers.virtio-iso},media=cdrom,readonly=on \
-      -nic user,model=virtio-net-pci
+      -nic user,model=virtio-net-pci"
+
+    timeout 3600 qemu-system-x86_64 $VMIX_DISPLAY $QEMU_ARGS || \
+      if [[ "$VMIX_DISPLAY" == "-display sdl" ]]; then
+        echo "=== vmix: SDL failed, retrying headless ==="
+        cp ${pkgs.OVMF.fd}/FV/OVMF_VARS.fd vars.fd && chmod +w vars.fd
+        timeout 3600 qemu-system-x86_64 -nographic $QEMU_ARGS
+      else
+        exit 1
+      fi
 
     echo "=== vmix: ${name} install complete ==="
     mv disk.qcow2 $out

lib/images/windows/templates/generalize.nix

@@ -53,6 +53,12 @@ in
     reg add "HKCU\Control Panel\Desktop" /v WallpaperStyle /t REG_SZ /d "0" /f
     ''}
 
+    :: Kill sysprep if it was triggered via CopyProfile'd startup entries
+    taskkill /f /im sysprep.exe 2>nul
+    :: Clean any leftover RunOnce/Run entries from audit phase
+    reg delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce" /v "vmixAudit" /f 2>nul
+    reg delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "vmixAudit" /f 2>nul
+
     :: Remove Edge AppxPackage for current user (runs in user context during OOBE)
     :: The app is already removed on one of the templates but a ghost appx entry remains that can only be deleted at the user level
     powershell -Command "Get-AppxPackage *MicrosoftEdge* | Remove-AppxPackage -ErrorAction SilentlyContinue"
@@ -148,7 +154,7 @@ in
     </unattend>
   '';
 in {
-  name = if delayOobeRun then "sealed" else "generalize";
+  name = if delayOobeRun then "generalize-delay-oobe" else "generalize";
   uploads = [
     { source = oobeXml; dest = "/oobe-unattend.xml"; }
     { source = postOobeScript; dest = "/post-oobe.cmd"; }
@@ -158,6 +164,10 @@ in {
   # generalize: sysprep + reboot into OOBE in the same QEMU session
   auditScript = ''
     @echo off
+    :: Remove cached Autounattend from initial install (contains Audit Mode reseal)
+    del /q C:\Windows\Panther\unattend.xml 2>nul
+    del /q C:\Windows\Panther\Unattend\unattend.xml 2>nul
+    del /q C:\Windows\System32\Sysprep\Panther\unattend.xml 2>nul
     C:\Windows\System32\Sysprep\sysprep.exe /generalize /oobe ${if delayOobeRun then "/shutdown" else "/reboot"} /quiet /unattend:C:\oobe-unattend.xml
   '';
 }