vinzenz/hyperhive
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share the flake's pkgs in host module-eval fixtures

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Each `hive` fixture imported its own nixpkgs. Pass the flake's pkgs
through nixpkgs.pkgs with nixpkgs' read-only module instead. On
module-eval-swarm-services-switch this drops nixpkgs instances from 52
to 23 and eval max RSS from 4.83 GiB to 3.28 GiB, with the same drvPath.

Agent fixtures keep their own nixpkgs: agent-modules sets
nixpkgs.config.allowUnfreePredicate, which a shared pkgs can't take.
This commit is contained in:
atlas 2026-10-17 09:29:48 +02:00 • committed by mara
commit 04cffe7957
1 changed files with 7 additions and 1 deletions
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8
nix/module-eval/lib.nix
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@ -37,11 +37,17 @@ let
# Stub host, same shape ./docs/default.nix already uses: enough for a
# `nixosSystem` to evaluate, nothing that pulls a real disk or
# bootloader in.
#
# Every host fixture reuses the flake's `pkgs` rather than importing its own
# nixpkgs. `read-only.nix` makes any host module that defines top-level
# `nixpkgs.config`/`overlays`/`hostPlatform` fail the fixture's eval instead
# of being ignored.
hive =
extra:
(nixosSystem {
system = pkgs.stdenv.hostPlatform.system;
modules = [
(pkgs.path + "/nixos/modules/misc/nixpkgs/read-only.nix")
{ nixpkgs.pkgs = pkgs; }
self.nixosModules.default
{
fileSystems."/" = {