Modularize nix config

hosts/common/default.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+
+  imports = [
+    ./nix.nix
+  ];
+  
+}

hosts/common/nix.nix

@@ -0,0 +1,18 @@
+{ config, pkgs, ... }:
+{
+
+  nix = {
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 7d";
+    };
+    settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      auto-optimise-store = true;
+      trusted-users = [ "jhemono" ];
+    };
+    channel.enable = false;
+  };
+
+}

hosts/gwiad/configuration.nix

@@ -8,6 +8,7 @@
   imports =
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
+      ../common
       ./home.nix
       # Services
       ./btrbk.nix
@@ -87,21 +88,6 @@
 
   environment.variables.EDITOR = "vim";
 
-  # Nix configuration
-  nix = {
-    gc = {
-      automatic = true;
-      dates = "weekly";
-      options = "--delete-older-than 7d";
-    };
-    settings = {
-      experimental-features = [ "nix-command" "flakes" ];
-      auto-optimise-store = true;
-      trusted-users = [ "jhemono" ];
-    };
-    channel.enable = false;
-  };
-
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   # programs.mtr.enable = true;

hosts/sesame/configuration.nix

@@ -8,6 +8,7 @@
   imports =
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
+      ../common
       # Supporting
       ./buckets.nix
       ./nginx.nix
@@ -69,15 +70,6 @@
 
   environment.variables.EDITOR = "vim";
 
-  # Nix configuration
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
-  nix.gc = {
-    automatic = true;
-    dates = "weekly";
-    options = "--delete-older-than 7d";
-  };
-  nix.settings.auto-optimise-store = true;
-
   # OpenSSH
   services.openssh = {
     enable = true;