Adds an installer output...

default.nix

@@ -26,6 +26,11 @@ let
   # Eval with `local.nix` if available.
   # This eval is the "WIP" eval. What's usually built with `nix-build`.
   eval = evalWith (optional (builtins.pathExists ./local.nix) (import (./local.nix )));
+
+  # This is used by the `-A installer` shortcut.
+  installer-eval = evalWith [
+    ./profiles/installer.nix
+  ];
 in
 {
   # The build artifacts from the modules system.
@@ -45,6 +50,10 @@ in
   # Any time `nix-build nixos` is used upstream, it can be used here.
   nixos = import <nixpkgs/nixos>;
 
+  # `mobile-installer` will, when possible, contain the installer build for the
+  # given system. It usually is an alias for a disk-image type build.
+  installer = installer-eval.config.system.build.mobile-installer;
+
   # Evaluating this whole set is counter-productive.
   # It'll put a *bunch* of build products from the misc. inherits we added.
 
@@ -58,6 +67,9 @@ in
     Building this whole set is counter-productive, and not likely to be what
     is desired.
 
+    You can try to build the `installer` attribute (-A installer) if your system
+    provides an installer.
+
     Please refer to your platform's documentation for usage.
   '';
 }

profiles/installer.nix

@@ -0,0 +1,24 @@
+{ config, lib, pkgs, ... }:
+
+let
+  ifSystem = type: lib.mkIf (config.mobile.system.type == type);
+in
+{
+  imports = [
+    <nixpkgs/nixos/modules/profiles/installation-device.nix>
+  ];
+
+  config = lib.mkMerge [
+    {
+      # This seems counter-intuitive to me, but networkmanager requires that
+      # this is set to false.
+      networking.wireless.enable = false;
+      networking.networkmanager.enable = true;
+    }
+    (ifSystem "depthcharge" {
+      environment.systemPackages = with pkgs; [
+        vboot_reference
+      ];
+    })
+  ];
+}