initial setup with impermanence

builder.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, ... }:
+
+{
+	nix.buildMachines = [ {
+	 hostName = "builder";
+	 system = "x86_64-linux";
+         protocol = "ssh-ng";
+	 # if the builder supports building for multiple architectures, 
+	 # replace the previous line by, e.g.
+	 # systems = ["x86_64-linux" "aarch64-linux"];
+	 maxJobs = 16;
+	 speedFactor = 8;
+	 supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+	 mandatoryFeatures = [ ];
+	}] ;
+	nix.distributedBuilds = true;
+	# optional, useful when the builder has a faster internet connection than yours
+	nix.extraOptions = ''
+	  builders-use-substitutes = true
+	'';
+	programs.ssh.extraConfig = ''
+        Host builder	
+	HostName 192.168.1.222
+	Port 9022
+	StrictHostKeyChecking=accept-new
+        '';
+}
+