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lib/modules: Test the ability for config to depend on options for compatibility #82802

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roberth commented Mar 17, 2020

Motivation for this change

Prepare for a decentralized future with flakes, where modules will need to adapt to their neighbors, about which those modules can not make too many assumptions. Supporting two releases of NixOS may be impossible at times for flakes if they can't read the options variable.

Additionally, this provides a partial solutions to the expression problem as applied to separately distributed modules.

Feature interactions: where to get the code?

               Core features     Feature A

Core features  nixpkgs/nixos     Flake A

Feature B      Flake B           ???

Without this feature, ??? will always have to be a separate module that users have to turn on manually to make the interaction between Feature A and Feature B not break.

With this feature, ??? can be packaged by either Flake A or Flake B, ensuring that the interaction between the features is always dealt with.

Things done
  • Used this in a real-life separately distributed NixOS module
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
@roberth roberth requested review from edolstra, Infinisil and nbp as code owners Mar 17, 2020
@roberth roberth mentioned this pull request Mar 17, 2020
4 of 4 tasks complete
@Infinisil Infinisil merged commit 05cf8a7 into NixOS:master Mar 18, 2020
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Evaluation Performance Report Evaluator Performance Report
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grahamcofborg-eval ^.^!
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grahamcofborg-eval-check-meta config.nix: checkMeta = true
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grahamcofborg-eval-darwin nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./pkgs/top-level/release.nix -A darwin-tested
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grahamcofborg-eval-nixos nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./nixos/release-combined.nix -A tested
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grahamcofborg-eval-nixos-manual nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./nixos/release.nix -A manual
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grahamcofborg-eval-nixos-options nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./nixos/release.nix -A options
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grahamcofborg-eval-nixpkgs-manual nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./pkgs/top-level/release.nix -A manual
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grahamcofborg-eval-nixpkgs-tarball nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./pkgs/top-level/release.nix -A tarball
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grahamcofborg-eval-nixpkgs-unstable-jobset nix-instantiate --arg nixpkgs { outPath=./.; revCount=999999; shortRev="ofborg"; } ./pkgs/top-level/release.nix -A unstable
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grahamcofborg-eval-package-list nix-env -qa --json --file .
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grahamcofborg-eval-package-list-no-aliases nix-env -qa --json --file . --arg config { allowAliases = false; }
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@Infinisil Infinisil mentioned this pull request Mar 19, 2020
1 of 1 task complete
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