From 25d7b4c53982f48ebd78b5bd7d0d6856f49cdf10 Mon Sep 17 00:00:00 2001
From: Pierre-Hugues Husson <phh@phh.me>
Date: Tue, 3 Apr 2018 00:13:48 +0200
Subject: [PATCH] Resize /system in boot

Is it really safe?
Tested on Allview V3 Viper and Huawei Mate 9
---
 base.mk                |  3 +++
 resize-system.sh       | 11 +++++++++++
 sepolicy/file_contexts |  1 +
 sepolicy/resize.te     |  6 ++++++
 vndk.rc                |  1 +
 5 files changed, 22 insertions(+)
 create mode 100644 resize-system.sh
 create mode 100644 sepolicy/resize.te

diff --git a/base.mk b/base.mk
index c1415aa..584cacc 100644
--- a/base.mk
+++ b/base.mk
@@ -43,5 +43,8 @@ PRODUCT_COPY_FILES += \
 PRODUCT_COPY_FILES += \
 	device/phh/treble/nfc/libnfc-nci.conf:system/etc/libnfc-nci.conf
 
+PRODUCT_COPY_FILES += \
+	device/phh/treble/resize-system.sh:system/bin/resize-system.sh
+
 PRODUCT_PACKAGES += \
 	treble-environ-rc
diff --git a/resize-system.sh b/resize-system.sh
new file mode 100644
index 0000000..cc90237
--- /dev/null
+++ b/resize-system.sh
@@ -0,0 +1,11 @@
+#!/system/bin/sh
+
+set -e
+
+if [ "grep ' /system ' /proc/mounts  |cut -d ' ' -f 1 |wc -l" -ne 1 ];then
+	exit 0
+fi
+
+mount -o remount,rw /system
+resize2fs $(grep ' /system ' /proc/mounts |cut -d ' ' -f 1)
+mount -o remount,ro /system
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index f80dc3a..e4a62b8 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -1,3 +1,4 @@
 /system/bin/phh-su                   u:object_r:phhsu_exec:s0
 /system/bin/vndk-detect			u:object_r:vndk_detect_exec:s0
 /system/etc/usb_audio_policy_configuration.xml	u:object_r:vendor_configs_file:s0
+/system/bin/resize-system.sh u:object_r:update_engine_exec:s0
diff --git a/sepolicy/resize.te b/sepolicy/resize.te
new file mode 100644
index 0000000..12d95c6
--- /dev/null
+++ b/sepolicy/resize.te
@@ -0,0 +1,6 @@
+allow update_engine { toolbox_exec system_file }:file rx_file_perms;
+allow update_engine labeledfs:filesystem remount;
+
+allow update_engine sysfs_fs_ext4_features:dir r_dir_perms;
+allow update_engine sysfs_fs_ext4_features:file r_file_perms;
+allow update_engine self:capability { sys_resource };
diff --git a/vndk.rc b/vndk.rc
index 064f0ae..7a31398 100644
--- a/vndk.rc
+++ b/vndk.rc
@@ -1,4 +1,5 @@
 on post-fs
 	exec - root -- /system/bin/vndk-detect
+	exec - root -- /system/bin/resize-system.sh
 	mount none /system/etc/usb_audio_policy_configuration.xml /vendor/etc/usb_audio_policy_configuration.xml bind
 	export LD_CONFIG_FILE /system/etc/ld.config.${persist.sys.vndk}.txt