Magisk/scripts/magisk_uninstaller.sh
2017-06-04 00:04:58 +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 in the following order:
# 1. Find and restore the original stock boot image dump (OTA proof)
# 2. Restore ramdisk from the internal backup (ramdisk fully restored, not OTA friendly)
# 3. Remove added files in ramdisk, modified files are remained intact. By doing so, Magisk
# will not be started at boot, but not removed clean enough
#
# Finally, this uninstaller will 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)
#
##########################################################################################
[ -z $BOOTMODE ] && BOOTMODE=false
MAGISKBIN=/data/magisk
CHROMEDIR=$MAGISKBIN/chromeos
[ -d /system/lib64 ] && SYSTEMLIB=/system/lib64 || SYSTEMLIB=/system/lib
# Default permissions
umask 022
# 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"
}
grep_prop() {
REGEX="s/^$1=//p"
shift
FILES=$@
if [ -z "$FILES" ]; then
FILES='/system/build.prop'
fi
cat $FILES 2>/dev/null | sed -n "$REGEX" | head -n 1
}
find_boot_image() {
if [ -z "$BOOTIMAGE" ]; then
for PARTITION in kern-a KERN-A android_boot ANDROID_BOOT kernel KERNEL boot BOOT lnx LNX; do
BOOTIMAGE=`readlink /dev/block/by-name/$PARTITION || readlink /dev/block/platform/*/by-name/$PARTITION || readlink /dev/block/platform/*/*/by-name/$PARTITION`
if [ ! -z "$BOOTIMAGE" ]; then break; fi
done
fi
if [ -z "$BOOTIMAGE" ]; then
FSTAB="/etc/recovery.fstab"
[ ! -f "$FSTAB" ] && FSTAB="/etc/recovery.fstab.bak"
[ -f "$FSTAB" ] && BOOTIMAGE=`grep -E '\b/boot\b' "$FSTAB" | grep -oE '/dev/[a-zA-Z0-9_./-]*'`
fi
}
# Environments
# Set permissions
chmod -R 755 $CHROMEDIR/futility $MAGISKBIN 2>/dev/null
# Find the boot image
find_boot_image
if [ -z "$BOOTIMAGE" ]; then
ui_print_wrap "! Unable to detect boot image"
exit 1
fi
ui_print_wrap "- Found Boot Image: $BOOTIMAGE"
cd $MAGISKBIN
ui_print_wrap "- Unpacking boot image"
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --unpack $BOOTIMAGE
if [ $? -ne 0 ]; then
ui_print_wrap "! Unable to unpack boot image"
exit 1
fi
# Update our previous backups to new format if exists
if [ -f /data/stock_boot.img ]; then
SHA1=`LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --sha1 /data/stock_boot.img | tail -n 1`
STOCKDUMP=/data/stock_boot_${SHA1}.img
mv /data/stock_boot.img $STOCKDUMP
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --compress $STOCKDUMP
fi
# Detect boot image state
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --cpio-test ramdisk.cpio
case $? in
0 )
ui_print_wrap "- Stock boot image detected!"
ui_print_wrap "! Magisk is not installed!"
exit
;;
1 )
ui_print_wrap "- Magisk patched image detected!"
# Find SHA1 of stock boot image
if [ -z $SHA1 ]; then
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --cpio-extract ramdisk.cpio init.magisk.rc init.magisk.rc.old
SHA1=`grep_prop "# STOCKSHA1" init.magisk.rc.old`
[ ! -z $SHA1 ] && STOCKDUMP=/data/stock_boot_${SHA1}.img
rm -f init.magisk.rc.old
fi
if [ -f ${STOCKDUMP}.gz ]; then
ui_print_wrap "- Boot image backup found!"
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --decompress ${STOCKDUMP}.gz stock_boot.img
else
ui_print_wrap "! Boot image backup unavailable"
ui_print_wrap "- Restoring ramdisk with backup"
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --cpio-restore ramdisk.cpio
LD_LIBRARY_PATH=$SYSTEMLIB ./magiskboot --repack $BOOTIMAGE stock_boot.img
fi
;;
2 ) # Other patched
ui_print_wrap "! Boot image patched by other programs!"
ui_print_wrap "! Cannot uninstall with this uninstaller"
exit 1
;;
esac
# Sign chromeos boot
if [ -f chromeos ]; then
echo > empty
LD_LIBRARY_PATH=$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
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/busybox /data/magisk /data/custom_ramdisk_patch.sh 2>/dev/null
$BOOTMODE && reboot