How to build a standalone NixOS QEMU VM?

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Hi,

I think you are looking for nixos/lib/make-disk-image.nix

If you look inside nixpkgs you can see how to use it, for example:

  system.build.qcow = import <nixpkgs/nixos/lib/make-disk-image.nix> {
    inherit lib config pkgs;
    diskSize = 10240;
    format = "qcow2";
  };

The result of building this attribute will be a qcow2 image of the current
configuration ready to be run with qemu.

Excerpts from Gestur Bjarkason via NixOS Discourse’s message of February 2, 2020 1:40 pm: