refine product make scripts

- allow enable overlayfs data partiton
- stub to extend product definition
- auto detect GPU

init.redroid.rc

@@ -1,10 +1,9 @@
 on early-init
+    mount debugfs debugfs /sys/kernel/debug mode=755
+
     mount none /system/etc /etc bind rec  # docker fix
     mount sysfs sysfs /sys rw remount  # ueventd fix
 
-    write /data/.empty 0
-    mount none /data/.empty /proc/vmallocinfo bind # lxcfs?
-
     # Mount binderfs
     mkdir /dev/binderfs
     mount binder binder /dev/binderfs stats=global
@@ -21,8 +20,23 @@ on early-init
     # fix for WSL2
     mkdir /dev/input
 
-    setprop gralloc.gbm.device /dev/dri/renderD128
-   
+    exec - root root -- /vendor/bin/gpu_config.sh
+
+
+# setup overlay data partition
+on early-init && property:ro.kernel.redroid.overlay=1
+    mkdir /data-diff/upper
+    rmdir /data-diff/work
+    mkdir /data-diff/work
+
+    mount overlay overlay /data lowerdir=/data-base,upperdir=/data-diff/upper,workdir=/data-diff/work
+
+
+on init
+    write /data/.empty 0
+    mount none /data/.empty /proc/vmallocinfo bind # lxcfs?
+
+
 on post-fs-data
     # fix for static IP, must after post-fs-data and before netd
     exec - system system -- /vendor/bin/ipconfigstore