Split Nix config in modules

db1.nix

@@ -1,34 +0,0 @@
-{ modulesPath, pkgs, ... }:
-{
-  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
-
-  boot.loader.grub.device = "/dev/sda";
-  fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
-
-  # Set NIX_PATH to be the same as the Terraform module
-  # nix.nixPath = [ "nixpkgs=${pkgs}" ];
-
-  environment.systemPackages = with pkgs; [
-    htop
-  ];
-  boot.cleanTmpDir = true;
-  networking.hostName = "db1";
-  networking.domain = "banditlair.com";
-  networking.firewall.allowPing = true;
-  networking.firewall.interfaces."enp7s0".allowedTCPPorts = [ 5432 ];
-  services.openssh.enable = true;
-  users.users.root.openssh.authorizedKeys.keyFiles = [
-     ./ssh_keys/phfroidmont-desktop.pub
-  ];
-
-  services.postgresql = {
-    enable = true;
-    package = pkgs.postgresql_12;
-    initialScript = "/var/keys/postgres-init.sql";
-    enableTCPIP = true;
-    authentication = ''
-      host all all 10.0.1.0/24 md5
-    '';
-  };
-  users.users.postgres.extraGroups = [ "keys" ];
-}

flake.nix

@@ -5,23 +5,49 @@
     let
       pkgs = nixpkgs.legacyPackages.x86_64-linux;
 
-      inputs = with pkgs; [
-        terraform_0_14
-        sops
-      ];
+      common = {
+        modules = [
+          ./hardware/hcloud.nix
+          ./modules/openssh.nix
+        ];
+      };
     in {
       devShell.x86_64-linux = pkgs.mkShell {
-        buildInputs = inputs;
+        buildInputs = with pkgs; [
+          terraform_0_14
+          sops
+        ];
       };
 
-      nixosConfigurations.db1 = nixpkgs.lib.nixosSystem {
-        system = "x86_64-linux";
-        modules = [ { imports = [ ./db1.nix ]; } ];
+      nixosConfigurations = {
+        db1 = nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+          modules = common.modules ++[
+            ./modules/postgresql.nix
+            ({
+              environment.systemPackages = with pkgs; [
+                htop
+              ];
+              networking.hostName = "db1";
+              networking.domain = "banditlair.com";
+              networking.firewall.interfaces."enp7s0".allowedTCPPorts = [ 5432 ];
+            })
+          ];
+        };
+        backend1 = nixpkgs.lib.nixosSystem {
+          system = "x86_64-linux";
+          modules = common.modules ++[
+            ./modules/murmur.nix
+            ./modules/synapse.nix
+            ({
+              networking.hostName = "backend1";
+              networking.domain = "banditlair.com";
+              networking.firewall.allowedTCPPorts = [ 80 443 64738 ];
+              networking.firewall.allowedUDPPorts = [ 64738 ];
+            })
+          ];
+        };
       };
 
-      nixosConfigurations.backend1 = nixpkgs.lib.nixosSystem {
-        system = "x86_64-linux";
-        modules = [ { imports = [ ./backend1.nix ]; } ];
-      };
     };
 }

hardware/hcloud.nix

@@ -0,0 +1,10 @@
+{ modulesPath, config, pkgs, ... }:
+{
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+
+  boot.loader.grub.device = "/dev/sda";
+  fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
+
+  boot.cleanTmpDir = true;
+  networking.firewall.allowPing = true;
+}

modules/murmur.nix

@@ -0,0 +1,11 @@
+{ config, lib, pkgs, ... }:
+{
+  services.murmur = {
+    enable = true;
+    bandwidth = 128000;
+    password = "$MURMURD_PASSWORD";
+    environmentFile = "/var/keys/murmur.env";
+  };
+
+  users.users.murmur.extraGroups = [ "keys" ];
+}

modules/openssh.nix

@@ -0,0 +1,7 @@
+{ pkgs, lib, config, ... }:
+{
+  services.openssh.enable = true;
+  users.users.root.openssh.authorizedKeys.keyFiles = [
+     ../ssh_keys/phfroidmont-desktop.pub
+  ];
+}

modules/postgresql.nix

@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }:
+{
+  services.postgresql = {
+    enable = true;
+    package = pkgs.postgresql_12;
+    initialScript = "/var/keys/postgres-init.sql";
+    enableTCPIP = true;
+    authentication = ''
+      host all all 10.0.1.0/24 md5
+    '';
+  };
+  users.users.postgres.extraGroups = [ "keys" ];
+}

modules/synapse.nix

@@ -1,31 +1,10 @@
-{ modulesPath, pkgs, lib, config, ... }:
+{ pkgs, lib, config, ... }:
 let
   fqdn =
     let
       join = hostName: domain: hostName + lib.optionalString (domain != null) ".${domain}";
     in join "matrix" config.networking.domain;
 in {
-  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
-
-  boot.loader.grub.device = "/dev/sda";
-  fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
-
-  # Set NIX_PATH to be the same as the Terraform module
-  # nix.nixPath = [ "nixpkgs=${pkgs}" ];
-
-  boot.cleanTmpDir = true;
-
-  networking.hostName = "backend1";
-  networking.domain = "banditlair.com";
-  networking.firewall.allowPing = true;
-  networking.firewall.allowedTCPPorts = [ 80 443 64738 ];
-  networking.firewall.allowedUDPPorts = [ 64738 ];
-
-  services.openssh.enable = true;
-  users.users.root.openssh.authorizedKeys.keyFiles = [
-     ./ssh_keys/phfroidmont-desktop.pub
-  ];
-
   security.acme.email = "letsencrypt.account@banditlair.com";
   security.acme.acceptTerms = true;
 
@@ -113,13 +92,4 @@ in {
     extraConfigFiles = [ "/var/keys/synapse-extra-config.yaml" ];
   };
   users.users.matrix-synapse.extraGroups = [ "keys" ];
-
-  services.murmur = {
-    enable = true;
-    bandwidth = 128000;
-    password = "$MURMURD_PASSWORD";
-    environmentFile = "/var/keys/murmur.env";
-  };
-
-  users.users.murmur.extraGroups = [ "keys" ];
 }