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When using `lib.optionals`, the return value of both branches of the condition get set as a value to the option. When using `lib.mkIf`, only the positive condition gets set as a value to the option. This small distinction is important when dealing with precedence. For example here, we wanted to set a boot.grub.devices default value with lib.mkDefault, and that was getting overridden with the empty value of `lib.optional (cfg.device != "") cfg.device`. See https://github.com/nix-community/srvos/pull/491#discussion_r1738827651 The general conclusion is that using `lib.mkIf` is preferable to `lib.optional` or `lib.optionals` when setting values in the NixOS module system. |
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| .. | ||
| external | ||
| generations-dir | ||
| generic-extlinux-compatible | ||
| grub | ||
| init-script | ||
| raspberrypi | ||
| systemd-boot | ||
| efi.nix | ||
| loader.nix | ||