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NixOS GSoC

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@cinerealkiara:matrix.org@cinerealkiara:matrix.org
In reply to @sanskar-0day:matrix.org

Hey @roberthensing:matrix.org (and anyone else around), I'm looking into the Modular Services GSoC project and had a quick architecture question.

Since the project description explicitly requires keeping the user-facing options of the NixOS module the same, I’m curious about the intended migration strategy. Is the plan to manually wire up the legacy global options to the new modular backend for each service one-by-one? Or is the goal to build a standardized abstraction (like a mkModularService wrapper) that automatically bridges the legacy options to the new modular instances?

this seems hard to automate since a nixos service module doesn't in a straight-forward manner map to a (systemd) service - they can span heterogeneous services (e.g. need a db) or spin up a set of similar services
07:55:28
@cinerealkiara:matrix.org@cinerealkiara:matrix.orgRedacted or Malformed Event07:56:29
@cinerealkiara:matrix.org@cinerealkiara:matrix.org* this seems hard to automate since a nixos service module doesn't in a straight-forward manner map to a (systemd) service - they can span heterogeneous services (e.g. need a db) or spin up [a set of similar services](https://github.com/NixOS/nixpkgs/pull/506645)08:21:36
@cinerealkiara:matrix.org@cinerealkiara:matrix.org* this seems hard to automate since a nixos service module doesn't in a straight-forward manner map to a (systemd) service - they can span heterogeneous services (e.g. need a db, example test at [contracts PR] (https://github.com/NixOS/nixpkgs/pull/506343)) or spin up [a set of similar services](https://github.com/NixOS/nixpkgs/pull/506645)08:24:14
@cinerealkiara:matrix.org@cinerealkiara:matrix.org* this seems hard to automate since a nixos service module doesn't in a straight-forward manner map to a (systemd) service - they can span heterogeneous services (e.g. need a db, example test at [contracts PR](https://github.com/NixOS/nixpkgs/pull/506343)) or spin up [a set of similar services](https://github.com/NixOS/nixpkgs/pull/506645)08:24:38
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29 Apr 2026
@sanskar-0day:matrix.orgSanskar

kiara: Reading through the easyturn (#506645) and contracts (#506343) PRs more carefully, I think I get now why a generic wrapper doesn't work.

They're actually two different failure modes: easyturn breaks because a flat legacy option space can't map to named instances without knowing the cardinality upfront, while contracts breaks because the module spans a runtime dependency graph that has no single modular equivalent.

One thing I'm still not clear on: if the contracts PR lands, does migration for a dependent service become two separate steps? First map it to its modular shape, then manually audit and add the contract declarations? Or is there a way the contract requirements get derived from the existing config references?

11:01:22

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