From 71e6e206c6739304e22254fe877e5ddfbde4df36 Mon Sep 17 00:00:00 2001
From: Adam Boardman <adamboardman@gmail.com>
Date: Wed, 30 Dec 2020 13:11:52 +0000
Subject: [PATCH] Add support for new generic android 9.0 system images

---
 debian/postinst | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/debian/postinst b/debian/postinst
index 7563817..9ba5ab8 100755
--- a/debian/postinst
+++ b/debian/postinst
@@ -7,12 +7,27 @@ if [ "$action" != configure ]; then
     exit 0
 fi
 
-target_checksum="39cd17718e838823c80be0ddfc9763d88e32c1b0"
+cmdline=$(</proc/cmdline)
+android_system_img="unknown"
+target_checksum="unknown"
+
+if [[ "$cmdline" =~ ^(.*)androidboot.hardware\=mt6797(.*)$ ]];
+then
+  android_system_img="/data/system.img"
+  target_checksum="39cd17718e838823c80be0ddfc9763d88e32c1b0"
+fi
+
+if [[ "$cmdline" =~ ^(.*)androidboot.hardware\=mt6771(.*)$ ]];
+then
+  android_system_img="/var/lib/lxc/android/android-rootfs.img"
+  target_checksum="4478ce425e593fb708b86234a8ea83e6fcdaaeec"
+fi
+
 echo "Target checksum $target_checksum"
 
-echo "Checking /data/system.img"
+echo "Checking $android_system_img"
 
-current_checksum="$(sha1sum /data/system.img | cut -d' ' -f1)"
+current_checksum="$(sha1sum $android_system_img | cut -d' ' -f1)"
 
 echo "Checksum $current_checksum"
 
@@ -30,7 +45,7 @@ else
   if [ "$target_checksum" == "$downloaded_checksum" ];
   then
     echo "Moving new system image into place, please reboot to activate"
-    mv $tempfile /data/system.img
+    mv $tempfile $android_system_img
     exit 0
   else
     echo "Downloaded checksum fail - check your internet for random errors or man in the middle attacks and retry"