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NixOS Module System

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17 Jan 2026
@mattsturg:matrix.orgMatt Sturgeon * internal doesn't affect who can use an option. It only affects whether it is documented. It's effectively the same thing as visible = "shallow". 13:05:04
18 Jan 2026
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19 Jan 2026
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21 Jan 2026
@bake.monorail:matrix.orgbake.monorail is there anything more specific than types.str I can use for a version number that I will later compare with lib.versionAtLeast? 20:39:57
@mattsturg:matrix.orgMatt Sturgeon

In string types we have strMatching, however that expects a regex not a predicate function.

The general solution is addCheck (see extending types), however the examples there don't show that you typically also want to extend/override the type's description.

20:46:28
@bake.monorail:matrix.orgbake.monorail yeah, I went with strMatching, but I was hoping to have a type matching exactly what versionAtLeast would accept, but I guess there's no such a thing 20:50:21
@bake.monorail:matrix.orgbake.monorail versionAtLeast under the hood uses builtins.compareVersions, which seems to accept anything, probably it has a last-resort method comparison that's just lexicographic comparison 20:53:24
22 Jan 2026
@nbp:mozilla.orgnbpI would say, at the very least types are part of the documentation, if you can give a more descriptive name even if there is no additional check, this might be worth it. (i-e. just aliasing the name my motivate someone else to add a check function later)11:28:54
28 Jan 2026
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15 Feb 2024
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16 Feb 2024
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@mr-qubo:matrix.orgmr-qubo

I recently stumbled upon similar issue when working on home-manager. https://discourse.nixos.org/t/is-it-possible-to-define-systemd-services-in-a-submodule/39538/5

The idea is that enabling https://nix-community.github.io/home-manager/options.xhtml#opt-programs.bash.enableCompletion should set environment.pathsToLink = [ "/share/bash-completion" ];.

I think that module system is missing an option to pass config options recursively up to all ancestors.

15:06:01
@mr-qubo:matrix.orgmr-qubo My idea is that nixos config could have a property extraNixosChildConfig and in home-manager bash module I could set _recurseAncestors = { extraNixosChildConfig = { environment.pathsToLink = [ ... ]; }; }. 15:07:22
@mr-qubo:matrix.orgmr-qubowdyt?15:07:26
@mr-qubo:matrix.orgmr-qubo * My idea is that nixos config could have a property extraNixosChildConfig that gets merged with the rest of the config and in home-manager bash module I could set _recurseAncestors = { extraNixosChildConfig = { environment.pathsToLink = [ ... ]; }; }. 15:07:44
@mr-qubo:matrix.orgmr-qubo * My idea is that nixos config could pick up extraNixosChildConfig from childs and merge it with the rest of the config and in home-manager bash module I could set _recurseAncestors = { extraNixosChildConfig = { environment.pathsToLink = [ ... ]; }; }. 15:08:21
@infinisil:matrix.orginfinisilNot sure about that recursive thing, that doesn't seem necessary, but yeah if there's something missing in the NixOS module for home-manager, that could be added15:34:09
@infinisil:matrix.orginfinisilSounds like an issue for the home-manager repo15:34:16
@mr-qubo:matrix.orgmr-quboYeah, we could add it just for home-manager. But is seems like the issue is quite generic. See also https://github.com/NixOS/nixpkgs/pull/152785.15:51:50
@infinisil:matrix.orginfinisilHmm yeah fair. I don't have the capacity to think a lot about this right now, it's a very intricate topic to wrap ones head around15:56:55
@mr-qubo:matrix.orgmr-quboYeah, I just wanted to bring the topic, maybe someone has some interesting thoughts.16:05:23

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