nova-image: use make-disk-image.nix

nixos/lib/make-disk-image.nix

···
       umount /mnt/proc /mnt/dev /mnt/sys
       umount /mnt
 
-      # Do an fsck to make sure resize2fs works.
+      # Do a fsck to make sure resize2fs works.
       fsck.${fsType} -f -y $rootDisk
     ''
 )

nixos/modules/virtualisation/nova-config.nix

···
-{ config, pkgs, modulesPath, ... }:
-
-{
-  imports = [ "${modulesPath}/virtualisation/nova-image.nix" ];
-}

nixos/modules/virtualisation/nova-image.nix

···
+# Usage:
+# $ NIXOS_CONFIG=`pwd`/nixos/modules/virtualisation/nova-image.nix nix-build '<nixpkgs/nixos>' -A config.system.build.novaImage
+
 { config, lib, pkgs, ... }:
 
 with lib;
 
 {
-  imports = [ ../profiles/qemu-guest.nix ../profiles/headless.nix ./ec2-data.nix ];
-
-  system.build.novaImage =
-    pkgs.vmTools.runInLinuxVM (
-      pkgs.runCommand "nova-image"
-        { preVM =
-            ''
-              mkdir $out
-              diskImage=$out/image
-              ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "4G"
-              mv closure xchg/
-            '';
-          buildInputs = [ pkgs.utillinux pkgs.perl ];
-          exportReferencesGraph =
-            [ "closure" config.system.build.toplevel ];
+  system.build.novaImage = import ../../lib/make-disk-image.nix {
+    inherit pkgs lib config;
+    partitioned = true;
+    diskSize = 1 * 1024;
+    configFile = pkgs.writeText "configuration.nix"
+      ''
+        {
+          imports = [ <nixpkgs/nixos/modules/virtualisation/nova-image.nix> ];
         }
-        ''
-          # 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.ext3 -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)
-
-          mkdir -p /mnt/nix/store
-          ${pkgs.rsync}/bin/rsync -av $storePaths /mnt/nix/store/
-
-          # 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 --option build-users-group ""
-
-          # Create the system profile to allow nixos-rebuild to work.
-          chroot /mnt ${config.nix.package}/bin/nix-env --option build-users-group "" \
-              -p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
-
-          # `nixos-rebuild' requires an /etc/NIXOS.
-          mkdir -p /mnt/etc
-          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
-
-          # Install a configuration.nix.
-          mkdir -p /mnt/etc/nixos
-          cp ${./nova-config.nix} /mnt/etc/nixos/configuration.nix
-
-          # Generate the GRUB menu.
-          chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
-
-          umount /mnt/proc /mnt/dev /mnt/sys
-          umount /mnt
-        ''
-    );
+  imports = [
+    ../profiles/qemu-guest.nix
+    ../profiles/headless.nix
+    ./ec2-data.nix
+  ];
 
   fileSystems."/".device = "/dev/disk/by-label/nixos";
 
   boot.kernelParams = [ "console=ttyS0" ];
-
-  boot.loader.grub.version = 2;
   boot.loader.grub.device = "/dev/vda";
   boot.loader.grub.timeout = 0;
 
+  # Allow root logins
+  services.openssh.enable = true;
+  services.openssh.permitRootLogin = "without-password";
+
   # Put /tmp and /var on /ephemeral0, which has a lot more space.
   # Unfortunately we can't do this with the `fileSystems' option
   # because it has no support for creating the source of a bind
   # mount.  Also, "move" /nix to /ephemeral0 by layering a unionfs-fuse
   # mount on top of it so we have a lot more space for Nix operations.
+
   /*
   boot.initrd.postMountCommands =
     ''
···
     '';
 
     boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
-    */
+  */
 
-  # Allow root logins only using the SSH key that the user specified
-  # at instance creation time.
-  services.openssh.enable = true;
-  services.openssh.permitRootLogin = "without-password";
 }