Add --window option to build-windows-base.sh

Show the guest in a QEMU window instead of the VNC display.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

build-windows-base.sh

@@ -19,7 +19,7 @@
 # SSH_PRIVATE_KEY_FILE for this script).
 #
 # Usage: build-windows-base.sh [--force] [--no-sysprep] [--keep-work] [--compress]
-#                              [--ssh-port PORT] [OUTPUT.qcow2]
+#                              [--window] [--ssh-port PORT] [OUTPUT.qcow2]
 # OUTPUT defaults to the path that "download-images.sh --print-path windows11"
 # prints, which is where run-windows11.py looks for the base image.
 set -euo pipefail
@@ -32,7 +32,7 @@ downloader="${images_dir}/download-images.sh"
 usage() {
   cat <<EOF
 Usage: $(basename "$0") [--force] [--no-sysprep] [--keep-work] [--compress]
-                         [--ssh-port PORT] [OUTPUT.qcow2]
+                         [--window] [--ssh-port PORT] [OUTPUT.qcow2]
 
 Install Windows 11 from the ISO, generalize it with sysprep and store the disk
 as the read-only base image that run-windows11.py clones.
@@ -42,6 +42,8 @@ as the read-only base image that run-windows11.py clones.
                   the machine SID and host name (fine for stand-alone VMs)
   --keep-work     Keep the scratch state directory (also kept on failure)
   --compress      Compress the output (smaller, but clones read it slower)
+  --window        Show the guest in a QEMU window (needs a desktop session)
+                  instead of the VNC display on 127.0.0.1:5990
   --ssh-port PORT Host port forwarded to the guest's SSH during the build
                   (default: 2299; overrides BASE_BUILD_SSH_PORT)
   -h, --help      Show this help
@@ -65,6 +67,7 @@ force=0
 sysprep=1
 keep_work=0
 compress=0
+window=0
 ssh_port="${BASE_BUILD_SSH_PORT:-2299}"
 output=""
 while (($#)); do
@@ -74,6 +77,7 @@ while (($#)); do
     --no-sysprep) sysprep=0 ;;
     --keep-work) keep_work=1 ;;
     --compress) compress=1 ;;
+    --window) window=1 ;;
     --ssh-port) shift; ssh_port="${1:?--ssh-port needs a value}" ;;
     --ssh-port=*) ssh_port="${1#*=}" ;;
     -*) usage >&2; exit 2 ;;
@@ -151,11 +155,21 @@ wait_for() {
 printf 'SSH  %s  22\n' "$ssh_port" >"${work}/forwards.conf"
 
 step "Installing Windows 11 from the ISO (unattended; takes a while)"
+display_option=(--vnc=127.0.0.1:90)
+if ((window)); then
+  [[ -n "${DISPLAY:-}${WAYLAND_DISPLAY:-}" || "$(uname -s)" == Darwin ]] \
+    || die "--window needs a desktop session (DISPLAY or WAYLAND_DISPLAY is not set)."
+  display_option=()
+fi
 WIN11_VM_FORWARDS="${work}/forwards.conf" "$launcher" \
-  --daemon --vnc=127.0.0.1:90 --install-from-iso --arch "$arch" --state-dir "$work"
+  --daemon "${display_option[@]}" --install-from-iso --arch "$arch" --state-dir "$work"
 
 step "Waiting for the guest to finish its first-logon setup (SSH answers)"
+if ((window)); then
+  note "Screen: QEMU window; console log: ${work}/console.log"
+else
   note "Screen: VNC 127.0.0.1:5990; console log: ${work}/console.log"
+fi
 if ! wait_for "${BASE_BUILD_TIMEOUT:-5400}" guest_ssh 'echo ready' >/dev/null 2>&1; then
   die "SSH did not answer in time; inspect the guest over VNC."
 fi