From cd795fd3f0a910b60cf9823284f3e99ba367301e Mon Sep 17 00:00:00 2001
From: Pratham Patel <prathampatel@thefossguy.com>
Date: Mon, 24 Mar 2025 01:39:32 +0530
Subject: [PATCH] nixos/modules: cosmic: init

---
 .../services/desktop-managers/cosmic.nix      | 142 ++++++++++++++++++
 .../services/x11/desktop-managers/default.nix |   1 +
 2 files changed, 143 insertions(+)
 create mode 100644 nixos/modules/services/desktop-managers/cosmic.nix

diff --git a/nixos/modules/services/desktop-managers/cosmic.nix b/nixos/modules/services/desktop-managers/cosmic.nix
new file mode 100644
index 000000000000..a6aa7cc3e826
--- /dev/null
+++ b/nixos/modules/services/desktop-managers/cosmic.nix
@@ -0,0 +1,142 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: Lily Foster <lily@lily.flowers>
+# Portions of this code are adapted from nixos-cosmic
+# https://github.com/lilyinstarlight/nixos-cosmic
+
+{
+  config,
+  lib,
+  pkgs,
+  utils,
+  ...
+}:
+
+let
+  cfg = config.services.desktopManager.cosmic;
+in
+{
+  meta.maintainers = with lib.maintainers; [
+    thefossguy
+    HeitorAugustoLN
+    nyabinary
+    ahoneybun
+  ];
+
+  options = {
+    services.desktopManager.cosmic = {
+      enable = lib.mkEnableOption "Enable the COSMIC desktop environment";
+
+      xwayland.enable = lib.mkEnableOption "Xwayland support for the COSMIC compositor" // {
+        default = true;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # Environment packages
+    environment.pathsToLink = [
+      "/share/backgrounds"
+      "/share/cosmic"
+    ];
+    environment.systemPackages =
+      with pkgs;
+      [
+        adwaita-icon-theme
+        alsa-utils
+        cosmic-applets
+        cosmic-applibrary
+        cosmic-bg
+        (cosmic-comp.override { useXWayland = false; })
+        cosmic-edit
+        cosmic-files
+        config.services.displayManager.cosmic-greeter.package
+        cosmic-icons
+        cosmic-idle
+        cosmic-launcher
+        cosmic-notifications
+        cosmic-osd
+        cosmic-panel
+        cosmic-player
+        cosmic-randr
+        cosmic-screenshot
+        cosmic-session
+        cosmic-settings
+        cosmic-settings-daemon
+        cosmic-term
+        cosmic-wallpapers
+        cosmic-workspaces-epoch
+        hicolor-icon-theme
+        playerctl
+        pop-icon-theme
+        pop-launcher
+        xdg-user-dirs
+      ]
+      ++ lib.optionals cfg.xwayland.enable [
+        xwayland
+      ]
+      ++ lib.optionals config.services.flatpak.enable [
+        cosmic-store
+      ];
+
+    # Distro-wide defaults for graphical sessions
+    services.graphical-desktop.enable = true;
+
+    xdg = {
+      icons.fallbackCursorThemes = lib.mkDefault [ "Cosmic" ];
+
+      portal = {
+        enable = true;
+        extraPortals = with pkgs; [
+          xdg-desktop-portal-cosmic
+          xdg-desktop-portal-gtk
+        ];
+        configPackages = lib.mkDefault [ pkgs.xdg-desktop-portal-cosmic ];
+      };
+    };
+
+    systemd = {
+      packages = [ pkgs.cosmic-session ];
+      user.targets = {
+        cosmic-session = {
+          wants = [ "xdg-desktop-autostart.target" ];
+          before = [ "xdg-desktop-autostart.target" ];
+        };
+        tray = {
+          description = "Cosmic Tray Target";
+          requires = [ "graphical-session-pre.target" ];
+        };
+      };
+    };
+
+    fonts.packages = with pkgs; [
+      fira
+      noto-fonts
+      open-sans
+    ];
+
+    # Required options for the COSMIC DE
+    environment.sessionVariables.X11_BASE_RULES_XML = "${config.services.xserver.xkb.dir}/rules/base.xml";
+    environment.sessionVariables.X11_EXTRA_RULES_XML = "${config.services.xserver.xkb.dir}/rules/base.extras.xml";
+    programs.dconf.enable = true;
+    programs.dconf.packages = [ pkgs.cosmic-session ];
+    security.polkit.enable = true;
+    security.rtkit.enable = true;
+    services.accounts-daemon.enable = true;
+    services.displayManager.sessionPackages = [ pkgs.cosmic-session ];
+    services.libinput.enable = true;
+    services.upower.enable = true;
+    # Setup PAM authentication for the `cosmic-greeter` user
+    security.pam.services.cosmic-greeter = { };
+
+    # Good to have defaults
+    hardware.bluetooth.enable = lib.mkDefault true;
+    networking.networkmanager.enable = lib.mkDefault true;
+    services.acpid.enable = lib.mkDefault true;
+    services.avahi.enable = lib.mkDefault true;
+    services.gnome.gnome-keyring.enable = lib.mkDefault true;
+    services.gvfs.enable = lib.mkDefault true;
+    services.power-profiles-daemon.enable = lib.mkDefault (
+      !config.hardware.system76.power-daemon.enable
+    );
+  };
+}
diff --git a/nixos/modules/services/x11/desktop-managers/default.nix b/nixos/modules/services/x11/desktop-managers/default.nix
index 42e66e86e1a3..4c0de95040c9 100644
--- a/nixos/modules/services/x11/desktop-managers/default.nix
+++ b/nixos/modules/services/x11/desktop-managers/default.nix
@@ -21,6 +21,7 @@ in
     ./lxqt.nix ./enlightenment.nix ./gnome.nix ./retroarch.nix ./kodi.nix
     ./mate.nix ./pantheon.nix ./surf-display.nix ./cde.nix
     ./cinnamon.nix ./budgie.nix ./deepin.nix ../../desktop-managers/lomiri.nix
+    ../../desktop-managers/cosmic.nix
   ];
 
   options = {