Magisk/scripts/magisk_uninstaller.sh
2017-07-10 00:17:34 +08:00

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#!/system/bin/sh
##########################################################################################
#
# Magisk Uninstaller
# by topjohnwu
#
# This script can be placed in /cache/magisk_uninstaller.sh
# The Magisk main binary will pick up the script, and uninstall itself, following a reboot
# This script can also be used in flashable zip with the uninstaller_loader.sh
#
# This script will try to do restoration with the following:
# 1-1. Find and restore the original stock boot image dump (OTA proof)
# 1-2. If 1-1 fails, restore ramdisk from the internal backup
# (ramdisk fully restored, not OTA friendly)
# 1-3. If 1-2 fails, it will remove added files in ramdisk, however modified files
# are remained modified, because we have no backups. By doing so, Magisk will
# not be started at boot, but this isn't actually 100% cleaned up
# 2. Remove all Magisk related files
# (The list is LARGE, most likely due to bad decision in early versions
# the latest versions has much less bloat to cleanup)
#
##########################################################################################
# Call ui_print_wrap if exists, or else simply use echo
# Useful when wrapped in flashable zip
ui_print_wrap() {
type ui_print >/dev/null 2>&1 && ui_print "$1" || echo "$1"
}
# Call abort if exists, or else show error message and exit
# Essential when wrapped in flashable zip
abort_wrap() {
type abort >/dev/null 2>&1
if [ $? -ne 0 ]; then
ui_print_wrap "$1"
exit 1
else
abort "$1"
fi
}
if [ ! -d $MAGISKBIN -o ! -f $MAGISKBIN/magiskboot -o ! -f $MAGISKBIN/util_functions.sh ]; then
ui_print_wrap "! Cannot find $MAGISKBIN"
exit 1
fi
[ -z $BOOTMODE ] && BOOTMODE=false
MAGISKBIN=/data/magisk
CHROMEDIR=$MAGISKBIN/chromeos
# Default permissions
umask 022
# Load utility functions
. $MAGISKBIN/util_functions.sh
# Find the boot image
find_boot_image
[ -z $BOOTIMAGE ] && abort "! Unable to detect boot image"
ui_print_wrap "- Found Boot Image: $BOOTIMAGE"
cd $MAGISKBIN
ui_print_wrap "- Unpacking boot image"
./magiskboot --unpack "$BOOTIMAGE"
[ $? -ne 0 ] && abort_wrap "! Unable to unpack boot image"
# Update our previous backup to new format if exists
if [ -f /data/stock_boot.img ]; then
SHA1=`./magiskboot --sha1 /data/stock_boot.img | tail -n 1`
STOCKDUMP=/data/stock_boot_${SHA1}.img
mv /data/stock_boot.img $STOCKDUMP
./magiskboot --compress $STOCKDUMP
fi
# Detect boot image state
./magiskboot --cpio-test ramdisk.cpio
case $? in
0 ) # Stock boot
ui_print_wrap "- Stock boot image detected!"
ui_print_wrap "! Magisk is not installed!"
exit
;;
1 ) # Magisk patched
ui_print_wrap "- Magisk patched image detected!"
# Find SHA1 of stock boot image
if [ -z $SHA1 ]; then
./magiskboot --cpio-extract ramdisk.cpio init.magisk.rc init.magisk.rc.old
SHA1=`grep_prop "# STOCKSHA1" init.magisk.rc.old`
rm -f init.magisk.rc.old
fi
[ ! -z $SHA1 ] && STOCKDUMP=/data/stock_boot_${SHA1}.img
if [ -f ${STOCKDUMP}.gz ]; then
ui_print_wrap "- Boot image backup found!"
./magiskboot --decompress ${STOCKDUMP}.gz stock_boot.img
else
ui_print_wrap "! Boot image backup unavailable"
ui_print_wrap "- Restoring ramdisk with backup"
./magiskboot --cpio-restore ramdisk.cpio
./magiskboot --repack $BOOTIMAGE stock_boot.img
fi
;;
2 ) # Other patched
ui_print_wrap "! Boot image patched by other programs!"
abort_wrap "! Cannot uninstall with this uninstaller"
;;
esac
# Sign chromeos boot
if [ -f chromeos ]; then
echo > empty
LD_LIBRARY_PATH=$SYSTEMLIB $CHROMEDIR/futility vbutil_kernel --pack stock_boot.img.signed \
--keyblock $CHROMEDIR/kernel.keyblock --signprivate $CHROMEDIR/kernel_data_key.vbprivk \
--version 1 --vmlinuz stock_boot.img --config empty --arch arm --bootloader empty --flags 0x1
rm -f empty stock_boot.img
mv stock_boot.img.signed stock_boot.img
fi
ui_print_wrap "- Flashing stock/reverted image"
if [ -L "$BOOTIMAGE" ]; then
dd if=stock_boot.img of="$BOOTIMAGE" bs=4096
else
cat stock_boot.img /dev/zero | dd of="$BOOTIMAGE" bs=4096 >/dev/null 2>&1
fi
rm -f stock_boot.img
ui_print_wrap "- Removing Magisk files"
rm -rf /cache/magisk.log /cache/last_magisk.log /cache/magiskhide.log /cache/.disable_magisk \
/cache/magisk /cache/magisk_merge /cache/magisk_mount /cache/unblock /cache/magisk_uninstaller.sh \
/data/Magisk.apk /data/magisk.apk /data/magisk.img /data/magisk_merge.img /data/magisk_debug.log \
/data/busybox /data/magisk /data/custom_ramdisk_patch.sh 2>/dev/null
$BOOTMODE && reboot