gistfile1.txt

self: super:

let

  mkEC2Image = format: (import (super.path + "/nixos/lib/eval-config.nix") {
    system = "x86_64-linux";
    modules =
      [
        (super.path + "/nixos/maintainers/scripts/ec2/amazon-image.nix")
        {
          ec2.hvm = true;
          amazonImage.format = format;

          # your custom config here.
        }
      ];
  }).config.system.build.amazonImage;

  ec2-image = super.recurseIntoAttrs {
    qcow2 = mkEC2Image "qcow2";
    vhd = mkEC2Image "vpc";
  };

in
{
  inherit ec2-image;
}