added robust iso

iso/iso_common.nix

@@ -0,0 +1,48 @@
+{ config, pkgs, lib, ... }:
+
+let
+  sovranSource = builtins.path { path = ../.; name = "sovran-systemsos"; };
+  installer = pkgs.writeShellScriptBin "sovran-install" (builtins.readFile ./installer.sh);
+in
+{
+  imports = [
+    "${pkgs.path}/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix"
+    ./branding.nix
+  ];
+
+  isoImage.isoName = "Sovran_SystemsOS.iso";
+
+  users.users.free = {
+    isNormalUser = true;
+    description = "free";
+    extraGroups = [ "wheel" "networkmanager" ];
+    initialPassword = "free";
+  };
+
+  services.displayManager.autoLogin.enable = true;
+  services.displayManager.autoLogin.user = "free";
+
+  environment.systemPackages = with pkgs; [
+    installer
+    zenity
+    util-linux
+    parted
+    dosfstools
+    e2fsprogs
+    gptfdisk
+    nixos-install-tools
+    git
+    curl
+  ];
+
+  environment.etc."sovran/flake".source = sovranSource;
+
+  environment.etc."xdg/autostart/sovran-installer.desktop".text = ''
+    [Desktop Entry]
+    Type=Application
+    Name=Sovran Guided Installer
+    Exec=${installer}/bin/sovran-install
+    Terminal=false
+    X-GNOME-Autostart-enabled=true
+  '';
+}