Consolidate printer config and enable simple-scan

Remove per‑host printers.nix and merge printing settings into host
variables.
Add simple-scan package and enable it for desktop and laptop hosts.
Disable simple-scan for the default host.
Enable SANE daemon and expose its libraries in fish init.
Open required UDP ports 5353 and 54925 in network module.

flake.nix

@@ -66,11 +66,10 @@
 
     mkHost = hostName: let
       hostVars = import ./hosts/${hostName}/variables.nix;
-      hostPrinterVars = import ./hosts/${hostName}/printers.nix;
     in
       nixpkgs.lib.nixosSystem {
         inherit (hostVars) system;
-        specialArgs = hostVars // hostPrinterVars // {inherit inputs;};
+        specialArgs = hostVars // {inherit inputs;};
         modules = [
           ./profiles/${hostVars.profile}
           nix-flatpak.nixosModules.nix-flatpak

hosts/Garand-Desktop/printers.nix

@@ -1,14 +0,0 @@
-{
-  printEnable = false;
-
-  ensureDefaultPrinter = "Brother-T525W";
-
-  ensurePrinters = [
-    {
-      deviceUri = "ipp://192.168.1.110/ipp";
-      location = "home";
-      name = "Brother-T525W";
-      model = "everywhere";
-    }
-  ];
-}

hosts/Garand-Desktop/system-modules.nix

@@ -113,5 +113,6 @@ _: {
     gedit.enable = true; # Gedit: GNOME text editor
     winboat.enable = false; # Winboat: Windows remote desktop via RDP
     adb.enable = false; # ADB: Android SDK platform tools
+    simpleScan.enable = true; # simple-scan: Simple scanning utility
   };
 }

hosts/Garand-Desktop/variables.nix

@@ -62,4 +62,24 @@
   # Set network hostId if required (needed for zfs)
   # Otherwise leave as-is
   hostId = "5ab03f50";
+
+  # Whether printing services should be enabled.
+  printEnable = true;
+  # Name of the default printer.
+  ensureDefaultPrinter = "Brother_DCP-T510W";
+  # List of printers to ensure are configured.
+  ensurePrinters = [
+    {
+      deviceUri = "ipp://192.168.1.106/ipp";
+      location = "home";
+      name = "Brother_DCP-T525W";
+      model = "everywhere";
+    }
+    {
+      deviceUri = "ipp://192.168.1.159/ipp";
+      location = "home";
+      name = "Brother_DCP-T510W";
+      model = "everywhere";
+    }
+  ];
 }

hosts/Garand-Laptop/printers.nix

@@ -1,14 +0,0 @@
-{
-  printEnable = true;
-
-  ensureDefaultPrinter = "Brother-T525W";
-
-  ensurePrinters = [
-    {
-      deviceUri = "ipp://192.168.1.110/ipp";
-      location = "home";
-      name = "Brother-T525W";
-      model = "everywhere";
-    }
-  ];
-}

hosts/Garand-Laptop/system-modules.nix

@@ -113,5 +113,6 @@ _: {
     gedit.enable = true; # Gedit: GNOME text editor
     winboat.enable = false; # Winboat: Windows remote desktop via RDP
     adb.enable = false; # ADB: Android SDK platform tools
+    simpleScan.enable = true; # simple-scan: Simple scanning utility
   };
 }

hosts/Garand-Laptop/variables.nix

@@ -62,4 +62,21 @@
   # Set network hostId if required (needed for zfs)
   # Otherwise leave as-is
   hostId = "7bc04e61";
+
+  printEnable = true;
+  ensureDefaultPrinter = "Brother_DCP-T510W";
+  ensurePrinters = [
+    {
+      deviceUri = "ipp://192.168.1.106/ipp";
+      location = "home";
+      name = "Brother_DCP-T525W";
+      model = "everywhere";
+    }
+    {
+      deviceUri = "ipp://192.168.1.159/ipp";
+      location = "home";
+      name = "Brother_DCP-T510W";
+      model = "everywhere";
+    }
+  ];
 }

hosts/default/printers.nix

@@ -1,21 +0,0 @@
-{
-  # Whether printing services should be enabled.
-  printEnable = false;
-
-  # Name of the default printer.
-  ensureDefaultPrinter = "[name]";
-
-  # List of printers to ensure are configured.
-  ensurePrinters = [
-    {
-      # URI of the printer device.
-      deviceUri = "ipp://[IPv4]/ipp";
-      # Physical location description of the printer.
-      location = "[location]";
-      # Human‑readable printer name.
-      name = "[name]";
-      # Printer model; "everywhere" uses generic driver.
-      model = "everywhere";
-    }
-  ];
-}

hosts/default/system-modules.nix

@@ -113,5 +113,6 @@ _: {
     gedit.enable = false; # Gedit: GNOME text editor
     winboat.enable = false; # Winboat: Windows remote desktop via RDP
     adb.enable = false; # ADB: Android SDK platform tools
+    simpleScan.enable = false; # simple-scan: Simple scanning utility
   };
 }

hosts/default/variables.nix

@@ -68,4 +68,22 @@
   # Set network hostId if required (needed for zfs)
   # Otherwise leave as-is
   hostId = "5ab03f50";
+
+  # Whether printing services should be enabled.
+  printEnable = false;
+  # Name of the default printer.
+  ensureDefaultPrinter = "[name]";
+  # List of printers to ensure are configured.
+  ensurePrinters = [
+    {
+      # URI of the printer device.
+      deviceUri = "ipp://[IPv4]/ipp";
+      # Physical location description of the printer.
+      location = "[location]";
+      # Human‑readable printer name.
+      name = "[name]";
+      # Printer model; "everywhere" uses generic driver.
+      model = "everywhere";
+    }
+  ];
 }

modules/core/network.nix

@@ -34,6 +34,8 @@
         }
       ];
       allowedUDPPorts = [
+        5353
+        54925
         59010
         59011
       ];

modules/core/packages/packages.nix

@@ -76,6 +76,7 @@
     notify = notify-client;
     boxes = gnome-boxes;
     switcheroo = switcheroo;
+    simpleScan = simple-scan;
   };
 in {
   imports = builtins.attrValues (builtins.mapAttrs mkPackage packages);

modules/core/printing.nix

@@ -31,8 +31,12 @@
     ipp-usb.enable = true;
   };
 
-  hardware.printers = lib.mkIf printEnable {
+  hardware = lib.mkIf printEnable {
-    ensureDefaultPrinter = ensureDefaultPrinter;
+    printers = {
-    ensurePrinters = ensurePrinters;
+      ensureDefaultPrinter = ensureDefaultPrinter;
+      ensurePrinters = ensurePrinters;
+    };
+
+    sane.enable = true;
   };
 }

modules/home/fish/default.nix

@@ -15,6 +15,9 @@
         set fish_greeting
         # fastfetch
       '';
+      shellInit = ''
+        set -gx LD_LIBRARY_PATH /etc/sane-libs $LD_LIBRARY_PATH
+      '';
     };
 
     nix-your-shell = {