libkookie: build: adding a function to build VM images for debugging

infra/libkookie/build

@@ -24,9 +24,8 @@ function build {
 
 ## Build and output build path for debugging
 function debug {
-    build "$@"
     echo "Build path: $OUT"
-    exit 0
+    exec build "$@"
 }
 
 ## Build and switch to the new configuration (requires root)
@@ -36,9 +35,32 @@ function switch {
     "$OUT"/bin/switch-to-configuration switch
 }
 
+function vmimage {
+    RUN="$1"; shift
+
+    NIXPKGS_ALLOW_UNFREE=1 \
+              nix build -f '<nixpkgs/nixos>' vm \
+              -I nixos-config="$ROOT" \
+              -I "nixpkgs=$DIR" \
+              -I "nixpkgs-overlays=$DIR/overlays" \
+              -I "home-manager=$DIR/home-manager" \
+              -I "modules=$DIR/modules" \
+              -I "configuration=$DIR/configuration" \
+              --argstr system x86_64-linux "$@"
+
+    if [ "$RUN" -eq "1" ]; then
+        echo "Running VM image..."
+        ./result/bin/run-$HOST-vm
+    fi
+
+    exit 0
+}
+
 case "$1" in
     -s* | --switch*) shift; switch "$@" ;;
     -d* | --debug*)  shift; debug "$@" ;;
+    -vr*)  shift; vmimage "1" "$@" ;;
+    -v*)  shift; vmimage "0" "$@" ;;
     *)               build "$@" ;;
 esac