added --vm flag to rebuild

.gitignore

@@ -1,4 +1,5 @@
 result
 .direnv
 .vscode/*
-!.vscode/settings.json
+!.vscode/settings.json
+nixos.qcow2

rebuild.sh

@@ -18,6 +18,7 @@ else
 fi
 
 show_trace=false
+clean_vm=false
 
 while [ $# -gt 0 ]; do
   case "$1" in
@@ -50,6 +51,9 @@ while [ $# -gt 0 ]; do
     --show-trace)
       show_trace=true
       ;;
+    --clean-vm)
+      clean_vm=true
+      ;;
     --help|-h)
       echo "--help -h: print this message"
       echo "--target -t: defaults to the current system"
@@ -58,6 +62,8 @@ while [ $# -gt 0 ]; do
       echo "    currently: ${target:-$default_target}"
       echo "--mode -m: defaults to 'switch', but 'test' on non-main branches"
       echo "    currently would be: $default_mode"
+      echo "    Available modes: switch, test, build, boot, vm"
+      echo "    'vm' mode builds and starts a virtual machine"
       echo "--user -u: defaults to the current user"
       echo "    currently: $default_user"
       echo "--host: defaults to building on the current machine"
@@ -65,6 +71,7 @@ while [ $# -gt 0 ]; do
       echo "--preserve-result: do not remove the generated result folder after building"
       echo "--no-preserve-result: remove any result folder after building"
       echo "--show-trace: show trace on builds"
+      echo "--clean-vm: remove existing VM disk (nixos.qcow2) before building"
       echo ""
       echo "Branch-aware behavior:"
       echo "  - On non-main branches: defaults to test mode with warning"
@@ -90,6 +97,20 @@ flake=${flake:-$target}
 mode=${mode:-$default_mode}
 user=${user:-$default_user}
 
+# Validate mode
+valid_modes="switch test build boot vm"
+if [[ ! " $valid_modes " =~ " $mode " ]]; then
+    echo "Error: Invalid mode '$mode'"
+    echo "Valid modes are: $valid_modes"
+    exit 1
+fi
+
+# Clean VM disk if requested
+if [[ "$clean_vm" = true ]] && [[ -f "nixos.qcow2" ]]; then
+    echo "Removing existing VM disk: nixos.qcow2"
+    rm nixos.qcow2
+fi
+
 # Branch-aware warnings and behavior
 if [[ "$current_branch" != "main" ]] && [[ "$mode" == "test" ]]; then
     echo "⚠️  WARNING: You are on branch '$current_branch' (not main)"
@@ -101,26 +122,39 @@ elif [[ "$current_branch" == "main" ]] && [[ -n "$git_status" ]] && [[ "$mode" !
     echo "   git checkout -b feature/your-feature-name"
 fi
 
-command="nixos-rebuild $mode --sudo --ask-sudo-password --flake .#$flake"
+if [[ "$mode" == "vm" ]]; then
+    command="nix build .#nixosConfigurations.$flake.config.system.build.vm"
+    
+    if [[ "$show_trace" = true ]]; then
+        command="$command --show-trace"
+    fi
+    
+    echo $command
+    $command
+    
+    if [[ $? -eq 0 ]] && [[ -d "result" ]]; then
+        echo "Starting VM..."
+        QEMU_KERNEL_PARAMS=console=ttyS0 ./result/bin/run-nixos-vm -nographic; reset
+    fi
+else
+    command="nixos-rebuild $mode --sudo --ask-sudo-password --flake .#$flake"
+    
+    if [[ $host ]]; then
+        command="$command --build-host $host"
+    fi
 
-if [[ $host ]];
-then
-  command="$command --build-host $host"
+    if [[ "$target" != "$(hostname)" ]]; then
+        command="$command --target-host $user@$target"
+    fi
+
+    if [[ "$show_trace" = true ]]; then
+        command="$command --show-trace"
+    fi
+    
+    echo $command
+    $command
 fi
 
-if [[ "$target" != "$(hostname)" ]];
-then
-	command="$command --target-host $user@$target"
-fi
-
-if [[ "$show_trace" = true ]];
-then
-	command="$command --show-trace"
-fi
-
-echo $command
-$command
-
 if [ -d "result" ];
 then
   if [[ "$preserve_result" == "false" ]];