demo: Enable adbd in burn tool

examples/demo/android-burn-tool.nix

@@ -7,39 +7,40 @@
 { config, lib, pkgs, ... }:
 
 let
-  inherit (lib) mkMerge mkOrder;
+  device_info = config.mobile.device.info;
 in
-  {
-    config = mkMerge [
-      {
-      # Ensures we don't quit stage-1
-      mobile.boot.stage-1.shell.enable = true;
+{
+  # Ensures we don't quit stage-1
+  mobile.boot.stage-1.shell.enable = true;
+  # Only enable `adb` if we know how to.
+  # FIXME: relies on implementation details. Poor separation of concerns.
+  mobile.adbd.enable = (config.mobile.system.type == "android") &&
+    (config.mobile.usb.mode != "gadgetfs" || device_info.gadgetfs.functions ? ffs)
+  ;
 
-      # Enables networking and ssh in stage-1 !
-      mobile.boot.stage-1.networking.enable = true;
-      mobile.boot.stage-1.ssh.enable = true;
-      mobile.boot.stage-1.fbterm.enable = true;
-      mobile.boot.stage-1.tasks = [
-        (pkgs.writeText "adjust-brightness-task.rb" ''
-          class Tasks::AdjustBrightness < SingletonTask
-            def initialize()
-              add_dependency(:Target, :Environment)
-              add_dependency(:Target, :Graphics)
-            end
+  # Enables networking and ssh in stage-1 !
+  mobile.boot.stage-1.networking.enable = true;
+  mobile.boot.stage-1.ssh.enable = true;
+  mobile.boot.stage-1.fbterm.enable = true;
+  mobile.boot.stage-1.tasks = [
+    (pkgs.writeText "adjust-brightness-task.rb" ''
+      class Tasks::AdjustBrightness < SingletonTask
+        def initialize()
+          add_dependency(:Target, :Environment)
+          add_dependency(:Target, :Graphics)
+        end
 
-            def run()
-              ["lcd-backlight", "wled"].each do |file|
-                # This can fail to write, ignore...
-                begin
-                  max = File.read("/sys/class/leds/#{file}/max_brightness").to_i
-                  File.write("/sys/class/leds/#{file}/brightness", (max * 0.1).to_i)
-                rescue
-                end
-              end
+        def run()
+          ["lcd-backlight", "wled"].each do |file|
+            # This can fail to write, ignore...
+            begin
+              max = File.read("/sys/class/leds/#{file}/max_brightness").to_i
+              File.write("/sys/class/leds/#{file}/brightness", (max * 0.1).to_i)
+            rescue
             end
           end
-        '')
-      ];
-    }
+        end
+      end
+    '')
   ];
 }