More streamlining of modules

modules/nixos/linode.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+
+let
+	cfg = config.greg.linode;
+
+in with lib;
+{
+	options.greg.linode = {
+		enable = mkEnableOption "Set sensible defaults for a Linode host";
+
+		bootTimeout = mkOption {
+			type = types.int;
+			default = 15;
+			description = "Set bootloader timeout in seconds.";
+		};
+	};
+
+	config = mkIf cfg.enable {
+		# Enables connection over Linode consoles
+		boot.kernelParams = [ "console=ttyS0,19200n8" ];
+		boot.loader.grub = {
+			device = "nodev";
+			extraConfig = ''
+serial --speed=19200 --unit=0 --word=8 --parity=no --stop=1;
+terminal_input serial;
+terminal_output serial;
+'';
+		};
+
+		# Tells grub to ignore partion-free device warnings, since we are on Linode
+		boot.loader.timeout = 15;
+
+		networking.usePredictableInterfaceNames = false;  # Use old style eth0 names
+		networking.useDHCP = false;
+		networking.interfaces.eth0.useDHCP = true;
+
+		# Suggested diagnostic tools
+		environment.systemPackages = with pkgs; [
+			inetutils
+			mtr
+			sysstat
+		];
+	};
+}