This is an example of how to pin the version of nixpkgs in a package repo. The goal is to improve reproducibility, make sure all the developers use the same version of nixpkgs and also allow to share binary caches.
Put all these files in a nixpkgs folder and then in other derivations, instead of import <nixpkgs> {} use import ./path/to/nixpkgs {}
In the following example, sddm will be used as a display manager. The process is however similar for other display managers in nixpkgs and a summary that applies to all nixpkgs display managers is given at the end.
Systemd unit "display-manager.service" starts services.x11.displayManager.job.execCmd (the display manager)
Code reference: <nixpkgs>/nixos/modules/services/x11/xserver.nix
services.x11.displayManager.job.execCmd is set to the path of the sddm binary from the sddm package in the nix store. So SDDM will start and read its configuration from /etc/sddm.conf.
The Github doesn't provide country code for Brazil (+55). To add this option, just run the code below in your console. The option Brazil +55 will be the first on the list, already selected:
🇧🇷 [pt-BR]
