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nixos: allow adding extra modules through environment

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This is useful for adding extra functionality or defaults to _every_
nixos evaluation.

My use case is overriding behaviour for all nixos tests, for example
setting packageOverrides to newer versions and changing some default
dependencies/settings.

By making this accessible through an environment variable, this can now
be fully accomplished externally. No more need to fork
nixos/nixpkgs (which becomes a maintenance burden), just use the channel
instead and plug in via this envvar.
This commit is contained in:
Mathijs Kwik 2014-12-16 17:07:14 +01:00
parent 8bfd6af9ed
commit 73f18fd42f
1 changed files with 5 additions and 4 deletions
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9
nixos/lib/eval-config.nix
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@ -11,15 +11,16 @@
, prefix ? []
}:
let extraArgs_ = extraArgs; pkgs_ = pkgs; system_ = system; in
rec {
let extraArgs_ = extraArgs; pkgs_ = pkgs; system_ = system;
extraModules = let e = builtins.getEnv "NIXOS_EXTRA_MODULE_PATH";
in if e == "" then [] else [(import (builtins.toPath e))];
in rec {
# Merge the option definitions in all modules, forming the full
# system configuration.
inherit (pkgs.lib.evalModules {
inherit prefix;
modules = modules ++ baseModules;
modules = modules ++ extraModules ++ baseModules;
args = extraArgs;
check = check && options.environment.checkConfigurationOptions.value;
}) config options;