From 0bceae9d26b4f3cc5a558cd6c8ea9d5637dde33a Mon Sep 17 00:00:00 2001
From: Christopher Roy Bratusek <nano@jpberlin.de>
Date: Sat, 4 Aug 2018 20:50:54 +0200
Subject: [PATCH] final A/B part

---
 CommonInstaller | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CommonInstaller b/CommonInstaller
index f906976..509bbf5 100644
--- a/CommonInstaller
+++ b/CommonInstaller
@@ -210,6 +210,8 @@ mount_partitions () {
 		mount --move /system /system_root
 		mount -o bind /system_root/system /system
 	fi
+
+	[ ! -f /system/build.prop ] && error "failed to mount /system (unsupported A/B device?)"
 }
 
 detect_mode () {