nixpkgs/nixos/lib/default.nix

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let
# The warning is in a top-level let binding so it is only printed once.
minimalModulesWarning = warn "lib.nixos.evalModules is experimental and subject to change. See nixos/lib/default.nix" null;
inherit (nonExtendedLib) warn;
nonExtendedLib = import ../../lib;
in
{ # Optional. Allows an extended `lib` to be used instead of the regular Nixpkgs lib.
lib ? nonExtendedLib,
# Feature flags allow you to opt in to unfinished code. These may change some
# behavior or disable warnings.
featureFlags ? {},
# This file itself is rather new, so we accept unknown parameters to be forward
# compatible. This is generally not recommended, because typos go undetected.
...
}:
let
seqIf = cond: if cond then builtins.seq else a: b: b;
# If cond, force `a` before returning any attr
seqAttrsIf = cond: a: lib.mapAttrs (_: v: seqIf cond a v);
eval-config-minimal = import ./eval-config-minimal.nix { inherit lib; };
testing-lib = import ./testing/default.nix { inherit lib; };
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in
/*
This attribute set appears as lib.nixos in the flake, or can be imported
using a binding like `nixosLib = import (nixpkgs + "/nixos/lib") { }`.
*/
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{
inherit (seqAttrsIf (!featureFlags?minimalModules) minimalModulesWarning eval-config-minimal)
evalModules
;
inherit (testing-lib)
evalTest
runTest
;
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}