System: Make RAID a common module and allow other systems to mount it

hosts/Dimaga/default.nix

@@ -96,10 +96,10 @@ in
       };
     };
 
-    packages = [
-      start-services
-      pkgs.htop
-    ];
+    packages = [ start-services ];
+
+    # Enable support for primary RAID array
+    raid.sapana.enable = true;
 
     # Change how long old generations are kept for.
     retentionPeriod = "30d";

hosts/Dimaga/hardware-configuration.nix

@@ -28,15 +28,6 @@ in
     kernelModules = [ "kvm-intel" ];
     extraModulePackages = [ ];
 
-    # Enable mdadm for Sapana (RAID 5 primary storage).
-    swraid = {
-      enable = true;
-      mdadmConf = ''
-        ARRAY /dev/md/Sapana metadata=1.2 UUID=51076daf:efdb34dd:bce48342:3b549fcb
-        MAILADDR ${config.secrets.users.aires.email}
-      '';
-    };
-
     # Enable support for building ARM64 packages
     binfmt.emulatedSystems = [ "aarch64-linux" ];
   };

hosts/Khanda/default.nix

@@ -45,6 +45,9 @@ in
     # Enable GPU support.
     gpu.intel.enable = true;
 
+    # Enable support for primary RAID array (just in case)
+    raid.sapana.enable = true;
+
     # Change how long old generations are kept for.
     retentionPeriod = "14d";
 

hosts/Shura/default.nix

@@ -55,6 +55,9 @@ in
       keepassxc # Use native instead of Flatpak due to weird performance issues
     ];
 
+    # Enable support for primary RAID array (just in case)
+    raid.sapana.enable = true;
+
     # Keep old generations for two weeks.
     retentionPeriod = "14d";
 

modules/common.nix

@@ -15,6 +15,8 @@
     aux.system = {
       packages = with pkgs; [
         fastfetch # Show a neat system statistics screen when opening a terminal
+        htop
+        mdadm # RAID management
         nh # Nix Helper: https://github.com/viperML/nh
         zellij # Terminal multiplexer
       ];

modules/system/raid.nix

@@ -0,0 +1,26 @@
+# Configures bluetooth.
+{ lib, config, ... }:
+
+let
+  cfg = config.aux.system.raid;
+in
+{
+
+  options = {
+    aux.system.raid = {
+      enable = lib.mkEnableOption "Enables RAID support.";
+      sapana.enable = lib.mkEnableOption "Enables support for the Sapana/storage array.";
+    };
+  };
+
+  config = lib.mkMerge [
+    (lib.mkIf cfg.enable { boot.swraid.enable = true; })
+    (lib.mkIf cfg.sapana.enable {
+      aux.system.raid.enable = true;
+      boot.swraid.mdadmConf = ''
+        ARRAY /dev/md/Sapana metadata=1.2 UUID=51076daf:efdb34dd:bce48342:3b549fcb
+        MAILADDR ${config.secrets.users.aires.email}
+      '';
+    })
+  ];
+}