Use make-disk-image.nix for VirtualBox images

nixos/lib/make-disk-image.nix

@@ -19,6 +19,9 @@
   # /etc/nixos/configuration.nix.
   configFile ? null
 
+, # Shell code executed after the VM has finished.
+  postVM ? ""
+
 }:
 
 with lib;
@@ -35,6 +38,7 @@ pkgs.vmTools.runInLinuxVM (
       buildInputs = [ pkgs.utillinux pkgs.perl pkgs.e2fsprogs pkgs.parted ];
       exportReferencesGraph =
         [ "closure" config.system.build.toplevel ];
+      inherit postVM;
     }
     ''
       ${if partitioned then ''
@@ -68,6 +72,7 @@ pkgs.vmTools.runInLinuxVM (
 
       mkdir -p /mnt/nix/store
       echo "copying everything (will take a while)..."
+      set -f
       cp -prd $storePaths /mnt/nix/store/
 
       # Register the paths in the Nix database.
@@ -94,6 +99,7 @@ pkgs.vmTools.runInLinuxVM (
 
       # Generate the GRUB menu.
       ln -s vda /dev/xvda
+      ln -s vda /dev/sda
       chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
 
       umount /mnt/proc /mnt/dev /mnt/sys

nixos/modules/virtualisation/virtualbox-image.nix

@@ -11,92 +11,36 @@ in {
   options = {
     virtualbox = {
       baseImageSize = mkOption {
-        type = types.str;
-        default = "10G";
+        type = types.int;
+        default = 10 * 1024;
         description = ''
-          The size of the VirtualBox base image. The size string should be on
-          a format the qemu-img command accepts.
+          The size of the VirtualBox base image in MiB.
         '';
       };
     };
   };
 
   config = {
-    system.build.virtualBoxImage =
-      pkgs.vmTools.runInLinuxVM (
-        pkgs.runCommand "virtualbox-image"
-          { memSize = 768;
-            preVM =
+
+    system.build.virtualBoxImage = import ../../lib/make-disk-image.nix {
+      inherit pkgs lib config;
+      partitioned = true;
+      diskSize = cfg.baseImageSize;
+
+      configFile = pkgs.writeText "configuration.nix"
         ''
-                mkdir $out
-                diskImage=$out/image
-                ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "${cfg.baseImageSize}"
-                mv closure xchg/
+          {
+            imports = [ <nixpkgs/nixos/modules/virtualisation/virtualbox-image.nix> ];
+          }
         '';
+
       postVM =
         ''
           echo "creating VirtualBox disk image..."
           ${pkgs.vmTools.qemu}/bin/qemu-img convert -f raw -O vdi $diskImage $out/disk.vdi
           rm $diskImage
         '';
-            buildInputs = [ pkgs.utillinux pkgs.perl ];
-            exportReferencesGraph =
-              [ "closure" config.system.build.toplevel ];
-          }
-          ''
-            # Create a single / partition.
-            ${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
-            ${pkgs.parted}/sbin/parted /dev/vda -- mkpart primary ext2 1M -1s
-            . /sys/class/block/vda1/uevent
-            mknod /dev/vda1 b $MAJOR $MINOR
-  
-            # Create an empty filesystem and mount it.
-            ${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda1
-            ${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
-            mkdir /mnt
-            mount /dev/vda1 /mnt
-  
-            # The initrd expects these directories to exist.
-            mkdir /mnt/dev /mnt/proc /mnt/sys
-            mount --bind /proc /mnt/proc
-            mount --bind /dev /mnt/dev
-            mount --bind /sys /mnt/sys
-  
-            # Copy all paths in the closure to the filesystem.
-            storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure)
-  
-            echo "filling Nix store..."
-            mkdir -p /mnt/nix/store
-            set -f
-            cp -prd $storePaths /mnt/nix/store/
-  
-            mkdir -p /mnt/etc/nix
-            echo 'build-users-group = ' > /mnt/etc/nix/nix.conf
-  
-            # Register the paths in the Nix database.
-            printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
-                chroot /mnt ${config.nix.package}/bin/nix-store --load-db
-  
-            # Create the system profile to allow nixos-rebuild to work.
-            chroot /mnt ${config.nix.package}/bin/nix-env \
-                -p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
-  
-            # `nixos-rebuild' requires an /etc/NIXOS.
-            mkdir -p /mnt/etc/nixos
-            touch /mnt/etc/NIXOS
-  
-            # `switch-to-configuration' requires a /bin/sh
-            mkdir -p /mnt/bin
-            ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
-  
-            # Generate the GRUB menu.
-            ln -s vda /dev/sda
-            chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
-  
-            umount /mnt/proc /mnt/dev /mnt/sys
-            umount /mnt
-          ''
-      );
+    };
 
     system.build.virtualBoxOVA = pkgs.runCommand "virtualbox-ova"
       { buildInputs = [ pkgs.linuxPackages.virtualbox ];
@@ -126,9 +70,9 @@ in {
 
     fileSystems."/".device = "/dev/disk/by-label/nixos";
 
-    boot.loader.grub.version = 2;
     boot.loader.grub.device = "/dev/sda";
 
     virtualisation.virtualbox.guest.enable = true;
+
   };
 }