Philip Munksgaard
8e5d6f456d
After d95261b435, the following flake.nix fails:
```nix
{
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
outputs = { nixpkgs, ... }: {
nixosConfigurations.demo = nixpkgs.lib.nixosSystem {
system = "x86_64-linux";
modules = [
({ lib, ... }: {
boot.loader.grub.enable = false;
fileSystems."/" = { device = "none"; fsType = "tmpfs"; };
nixpkgs.config.packageOverrides =
lib.mkIf false (_: { });
})
];
};
};
}
```
This is the error:
```
$ nix build /tmp/tmp.vWEVitTgK9/#nixosConfigurations.demo.config.system.build.toplevel
evaluation warning: system.stateVersion is not set, defaulting to 26.05. Read why this matters on https://nixos.org/manual/nixos/stable/options.html#opt-system.stateVersion.
error:
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:37:12:
36|
37| strict = derivationStrict drvAttrs;
| ^
38|
… while evaluating derivation 'nixos-system-nixos-26.05.20260409.4c1018d'
whose name attribute is located at /nix/store/anvdcc2arw7kqrvwnidvhw6ypkkvws68-source/pkgs/stdenv/generic/make-derivation.nix:541:11
… while evaluating attribute 'buildCommand' of derivation 'nixos-system-nixos-26.05.20260409.4c1018d'
at /nix/store/anvdcc2arw7kqrvwnidvhw6ypkkvws68-source/nixos/modules/system/activation/top-level.nix:64:7:
63| passAsFile = [ "extraDependencies" ];
64| buildCommand = systemBuilder;
| ^
65|
… while evaluating the option `environment.etc.dbus-1.source':
… while evaluating the default value of option `pythonTestDriverPackage`
… while evaluating the module argument `hostPkgs' in "/nix/store/anvdcc2arw7kqrvwnidvhw6ypkkvws68-source/nixos/lib/testing/driver.nix":
… noting that argument `hostPkgs` is not externally provided, so querying `_module.args` instead, requiring `config`
… while evaluating the option `hostPkgs':
(stack trace truncated; use '--show-trace' to show the full, detailed trace)
error: The option `hostPkgs' was accessed but has no value defined. Try setting the option.
```
Setting a `defaultText` fixes the issue.
I've also added a regression test under `nixos/tests/nixos-test-driver/` and
fixed a typo in the option description ("implemetnation").
Nixpkgs is a collection of over 120,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
Manuals
- NixOS Manual - how to install, configure, and maintain a purely-functional Linux distribution
- Nixpkgs Manual - contributing to Nixpkgs and using programming-language-specific Nix expressions
- Nix Package Manager Manual - how to write Nix expressions (programs), and how to use Nix command line tools
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- Discourse Forum
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The sources of all official Nix-related projects are in the NixOS organization on GitHub. Here are some of the main ones:
- Nix - the purely functional package manager
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Nixpkgs and NixOS are built and tested by our continuous integration system, Hydra.
- Continuous package builds for unstable/master
- Continuous package builds for the NixOS 25.11 release
- Tests for unstable/master
- Tests for the NixOS 25.11 release
Artifacts successfully built with Hydra are published to cache at https://cache.nixos.org/. When successful build and test criteria are met, the Nixpkgs expressions are distributed via Nix channels.
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Nixpkgs is among the most active projects on GitHub. While thousands of open issues and pull requests might seem like a lot at first, it helps to consider it in the context of the scope of the project. Nixpkgs describes how to build tens of thousands of pieces of software and implements a Linux distribution. The GitHub Insights page gives a sense of the project activity.
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For more information about contributing to the project, please visit the contributing page.
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Nixpkgs is licensed under the MIT License.
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