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I'm trying to build my Nix configuration in GitLab CI, to make sure any changes have at least a chance of working in NixOS. The official Nix Docker image has a very different structure from NixOS (being based on Alpine), and I keep getting an error I've no idea how to resolve:

$ docker run --volume=$(pwd):/etc/nixos --interactive --rm --tty nixos/nix
5cc8dad8d887:/# nix-build /etc/nixos/configuration.nix
error: cannot auto-call a function that has an argument without a default value ('config')

Even the file generated by nixos-generate-config has the same problem:

$ cd "$(mktemp --directory)"
$ nixos-generate-config --root .
$ nix-build etc/nixos/configuration.nix
error: cannot auto-call a function that has an argument without a default value ('config')

The only other repo I've found to do something similar is much more complex than what I was hoping to do here.

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Worked it out, finally:

build:
  stage: test
  image: nixos/nix
  before_script:
  - echo system-features = kvm | tee -a /etc/nix/nix.conf
  - echo {} | tee common.nix hardware-configuration.nix host.nix
  - nix-env --install --attr nixpkgs.nixos-rebuild nixpkgs.man
  script:
  - nix-build '<nixpkgs/nixos>' -I nixos-config=ci.nix
  cache:
  - key:
      files:
      - configuration.nix
    paths:
    - /nix/store

ci.nix overrides some things to be able to build:

{ lib, ... }: {
  imports = [ ./configuration.nix ];
  boot = lib.mkForce { };
  environment.systemPackages = lib.mkForce [ ];
}

Caveat: To avoid running out of disk space (or having to create and maintain my own runners) I've emptied environment.systemPackages in ci.yml.

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