nixpkgs/default.nix

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let
fromEnv = name: default:
let env = builtins.getEnv name; in
if env == "" then default else env;
configuration = import (fromEnv "NIXOS_CONFIG" /etc/nixos/configuration.nix);
nixpkgs = fromEnv "NIXPKGS" /etc/nixos/nixpkgs;
pkgs = import nixpkgs {system = builtins.currentSystem;};
inherit
(import ./lib/eval-config.nix {inherit configuration pkgs;})
config optionDeclarations;
in
{
# Optionally check wether all config values have corresponding
# option declarations.
system = pkgs.checker config.system.build.system
config.environment.checkConfigurationOptions
optionDeclarations config;
# The following are used by nixos-rebuild.
nixFallback = pkgs.nixUnstable;
manifests = config.installer.manifests;
tests = config.tests;
}