{
  pkgs ? import <nixpkgs> {},
  system ? builtins.currentSystem,
  nixvirt,
}: let
  inherit (nixvirt) lib;
  vm = import ./lib/vm.nix { inherit pkgs nixvirt; };
  osdb = import ./db.nix { inherit pkgs system; };
  volumeFn = { name, size }: nixvirt.lib.volume.writeXML {
    name = name + ".qcow2";
    capacity = { count = size; unit = "GB"; };
    target = {
      format.type = "qcow2";
    };
  };
  mkVM = {
    name,
    uuid,
    arch,
    isos,
  }: rec {
    base = {
      inherit name uuid arch;
      volume.index = 0;
      volume.bus = "sata";
      volume.file = "/var/lib/libvirt/images/${name}.qcow2";
    };
    idxToDev = i: builtins.substring i 1 "abcdefg";

    volume = volumeFn { size = 16; inherit name; };

    beforeInstall = isos.beforeInstall; # Required attribute.
    afterInstall = if builtins.hasAttr "afterInstall" isos then isos.afterInstall else [];
    beforeBoot = if builtins.hasAttr "beforeBoot" isos then isos.beforeBoot else [];
    afterBoot = if builtins.hasAttr "afterBoot" isos then isos.afterBoot else [];
    beforeInstallDrv = lib.domain.writeXML (vm.genericVM (base // {
      cdroms = map (x: {
        inherit (x) index file;
        bus = "sata";
        dev = "sd" + idxToDev x.index;
      }) (beforeInstall);
    }));
    afterInstallDrv = lib.domain.writeXML (vm.genericVM (base // {
      cdroms = map (x: {
        inherit (x) index file;
        bus = "sata";
        dev = "sd" + idxToDev x.index;
      }) (afterInstall);
    }));
    beforeBootDrv = lib.domain.writeXML (vm.genericVM (base // {
      cdroms = map (x: {
        inherit (x) index file;
        bus = "sata";
        dev = "sd" + idxToDev x.index;
      }) (beforeBoot);
    }));
    afterBootDrv = lib.domain.writeXML (vm.genericVM (base // {
      cdroms = map (x: {
        inherit (x) index file;
        bus = "sata";
        dev = "sd" + idxToDev x.index;
      }) (afterBoot);
    }));
  };
in {
  inherit osdb;

  mkFlake = config: let
    vm = mkVM {
      inherit (config) name uuid;
      beforeInstall = [
        { index = 1; file = "${osdb.${config.os.name}.${config.os.version}.${config.os.edition}.${config.os.arch}.installer}/out.iso"; }
        { index = 2; file = "${osdb.${config.os.name}.${config.os.version}.${config.os.edition}.${config.os.arch}.unattend}/out.iso"; }
      ];
    };
  in {
    packages.volume = vm.volume;
    packages.beforeInstall = vm.beforeInstallDrv;
    packages.afterInstall = vm.afterInstallDrv;
    packages.beforeBoot = vm.beforeBootDrv;
    packages.afterBoot = vm.afterBootDrv;
  };
  
}