nixpkgs module: Fix defaulting of localSystem and system for 18.09#46343
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grahamc merged 1 commit intoNixOS:release-18.09from Sep 8, 2018
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nixpkgs module: Fix defaulting of localSystem and system for 18.09#46343grahamc merged 1 commit intoNixOS:release-18.09from
localSystem and system for 18.09#46343grahamc merged 1 commit intoNixOS:release-18.09from
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Take two of NixOS#40708 (4fe2898). That PR attempted to bidirectionally default `config.nixpkgs.system` and `config.nixpkgs.localSystem.system` to each be updated by the other. But this is not possible with the way the module system works. Divergence in certain cases in inevitable. This PR is more conservative and just has `system` default `localSystem` and `localSystem` make the final call as-is. This solves a number of issues. - `localSystem` completely overrides `system`, just like with nixpkgs proper. There is no need to specify `localSystem.system` to clobber the old system. - `config.nixpkgs.localSystem` is exactly what is passed to nixpkgs. No spooky steps. - `config.nixpkgs.localSystem` is elaborated just as nixpkgs would so that all attributes are available, not just the ones the user specified. The remaining issue is just that `config.nixpkgs.system` doesn't update based on `config.nixpkgs.localSystem.system`. It should never be referred to lest it is a bogus stale value because `config.nixpkgs.localSystem` overwrites it. Fixes NixOS#46320
Ericson2314
changed the title
localSystem and systemlocalSystem and system for 18.09
GrahamcOfBorg
added
6.topic: nixos
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Backport of #46341