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96d36b0c2e
This replaces the naive K=V unit parser with a proper INI parser from a library and adds proper support for override files. Also adds a bunch of comments about parsing, I hope this makes it easier to understand and maintain in the future. There are multiple reasons to do so, the first one is just general correctness with is nice imo. But to get to more serious reasons (I didn't put in all that effort for nothing) is that this is the first step torwards more clever restart/reload handling. By using a library like Data::Compare a future PR could replace the current way of fingerprinting units (which is to compare store paths) by comparing the hashes. This is more precise because units won't get restarted because the order of the options change, comments are added, some dependency of writeText changes, .... Also this allows us to add a feature like `X-Reload-Triggers` so the unit can either be reloaded when these change or restarted when everything else changes, giving module authors the ability to have their services reloaded without having to fear that updates are not applied because the service doesn't get restarted. Another reason why this feature is nice is that now that the unit files are parsed correctly (and values are just extracted from one section), potential future rewrites can just rely on some INI library without having to implement their own weird parser that is compatible with this script. This also comes with a new subroutine to handle systemd booleans because I thought the current way of handling it was just ugly. This also allows overriding values this script reads in an override file. Apart from making this script more compatible with the world around it, this also fixes two issues I saw bugging exactly 0 (zero) people. First is that this script now supports multiple override files, also ones that are not called override.conf and the second one is that `1` and `on` are treated as bools by systemd but were previously not parsed as such by switch-to-configuration. |
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| default.nix | ||
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| release-combined.nix | ||
| release-small.nix | ||
| release.nix | ||
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.