Nix package set and NixOS module for using COSMIC. It is mainly a repository for testing COSMIC as it is developed.
Dedicated development matrix room: https://matrix.to/#/#cosmic:nixos.org
If you have an existing configuration.nix
, you can use the nixos-cosmic
flake with the following in an adjacent flake.nix
(e.g. in /etc/nixos
):
Note: If switching from traditional evaluation to flakes, nix-channel
will no longer have any effect on the nixpkgs your system is built with, and therefore nixos-rebuild --upgrade
will also no longer have any effect. You will need to use nix flake update
from your flake directory to update nixpkgs and nixos-cosmic.
{
inputs = {
nixpkgs.follows = "nixos-cosmic/nixpkgs"; # NOTE: change "nixpkgs" to "nixpkgs-stable" to use stable NixOS release
nixos-cosmic.url = "github:lilyinstarlight/nixos-cosmic";
};
outputs = { self, nixpkgs, nixos-cosmic }: {
nixosConfigurations = {
# NOTE: change "host" to your system's hostname
host = nixpkgs.lib.nixosSystem {
modules = [
{
nix.settings = {
substituters = [ "https://cosmic.cachix.org/" ];
trusted-public-keys = [ "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE=" ];
};
}
nixos-cosmic.nixosModules.default
./configuration.nix
];
};
};
};
}
Note: To ensure binary substituters are set up before attempting to pull any COSMIC packages, perform a nixos-rebuild test
with this configuration before attempting to add any COSMIC packages or settings to your NixOS configuration.
After setting up binary substituters and NixOS module, enable COSMIC with services.desktopManager.cosmic.enable = true
and services.displayManager.cosmic-greeter.enable = true
in your NixOS configuration.
To use COSMIC Store to manage Flatpaks, set services.flatpak.enable = true
and then run flatpak remote-add --user flathub https://dl.flathub.org/repo/flathub.flatpakrepo
in your user terminal to add the Flathub repository.
Although there is a provided binary cache built against the current nixos-unstable
and nixos-24.11
branches, if you are not using a current nixos-unstable
or nixos-24.11
then you may need to build packages locally.
Generally you will need roughly 16 GiB of RAM and 40 GiB of disk space, but it can be built with less RAM by reducing build parallelism, either via --cores 1
or -j 1
or both, on nix build
, nix-build
, and nixos-rebuild
commands.
Phantom non-existent display on Nvidia (cosmic-randr#13)
If while using an Nvidia GPU, cosmic-settings
and cosmic-randr list
show an additional display that can not be disabled, try Nvidia's experimental framebuffer device.
Add to your configuration:
boot.kernelParams = [ "nvidia_drm.fbdev=1" ];
The zwlr_data_control_manager_v1 protocol needs to be available. Enable it in cosmic-comp via the following configuration:
environment.sessionVariables.COSMIC_DATA_CONTROL_ENABLED = 1