Magisk/scripts/boot_patch.sh
2017-09-26 20:21:43 +08:00

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#!/system/bin/sh
##########################################################################################
#
# Magisk Boot Image Patcher
# by topjohnwu
#
# This script should be placed in a directory with the following files:
#
# File name type Description
#
# boot_patch.sh script A script to patch boot. Expect path to boot image as parameter.
# (this file) The script will use binaries and files in its same directory
# to complete the patching process
# magisk binary The main binary for all Magisk operations.
# It is also used to patch the sepolicy in the ramdisk.
# magiskboot binary A tool to unpack boot image, decompress ramdisk, extract ramdisk
# , and patch the ramdisk for Magisk support
# init.magisk.rc script A new line will be added to init.rc to import this script.
# All magisk entrypoints are defined here
# chromeos folder This folder should store all the utilities and keys to sign
# (optional) a chromeos device, used in the tablet Pixel C
#
# If the script is not running as root, then the input boot image should be a stock image
# or have a backup included in ramdisk internally, since we cannot access the stock boot
# image placed under /data we've created when previously installing
#
##########################################################################################
##########################################################################################
# Functions
##########################################################################################
# Pure bash dirname implementation
dirname_wrap() {
case "$1" in
*/*)
dir=${1%/*}
[ -z $dir ] && echo "/" || echo $dir
;;
*)
echo "."
;;
esac
}
# Pure bash basename implementation
basename_wrap() {
echo ${1##*/}
}
# --cpio-add <incpio> <mode> <entry> <infile>
cpio_add() {
./magiskboot --cpio-add ramdisk.cpio $1 $2 $3
}
# --cpio-extract <incpio> <entry> <outfile>
cpio_extract() {
./magiskboot --cpio-extract ramdisk.cpio $1 $2
}
# --cpio-mkdir <incpio> <mode> <entry>
cpio_mkdir() {
./magiskboot --cpio-mkdir ramdisk.cpio $1 $2
}
##########################################################################################
# Initialization
##########################################################################################
BOOTIMAGE="$1"
[ -e "$BOOTIMAGE" ] || (echo "$BOOTIMAGE does not exist!" && exit 1)
# Presets
[ -z $KEEPVERITY ] && KEEPVERITY=false
[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
# Detect whether running as root
id | grep "uid=0" >/dev/null 2>&1 && ROOT=true || ROOT=false
if [ -z $SOURCEDMODE ]; then
# Switch to the location of the script file
cd "`dirname_wrap "${BASH_SOURCE:-$0}"`"
# Load utility functions
. ./util_functions.sh
# Detect current status
mount_partitions
fi
chmod -R 755 .
##########################################################################################
# Unpack
##########################################################################################
migrate_boot_backup
CHROMEOS=false
ui_print "- Unpacking boot image"
./magiskboot --unpack "$BOOTIMAGE"
case $? in
1 )
abort "! Unable to unpack boot image"
;;
2 )
CHROMEOS=true
;;
3 )
ui_print "! Sony ELF32 format detected"
abort "! Please use BootBridge from @AdrianDC to flash Magisk"
;;
4 )
ui_print "! Sony ELF64 format detected"
abort "! Stock kernel cannot be patched, please use a custom kernel"
esac
##########################################################################################
# Ramdisk restores
##########################################################################################
# Test patch status and do restore, after this section, ramdisk.cpio.orig is guaranteed to exist
ui_print "- Checking ramdisk status"
./magiskboot --cpio-test ramdisk.cpio
case $? in
0 ) # Stock boot
ui_print "- Stock boot image detected!"
ui_print "- Backing up stock boot image"
SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
STOCKDUMP=stock_boot_${SHA1}.img
dd if="$BOOTIMAGE" of=$STOCKDUMP
./magiskboot --compress $STOCKDUMP
cp -af ramdisk.cpio ramdisk.cpio.orig
;;
1 ) # Magisk patched
ui_print "- Magisk patched image detected!"
# Find SHA1 of stock boot image
[ -z $SHA1 ] && SHA1=`./magiskboot --cpio-stocksha1 ramdisk.cpio 2>/dev/null`
OK=false
./magiskboot --cpio-restore ramdisk.cpio
if [ $? -eq 0 ]; then
ui_print "- Ramdisk restored from internal backup"
OK=true
else
# Restore failed
ui_print "! Cannot restore from internal backup"
# If we are root and SHA1 known, we try to find the stock backup
if $ROOT && [ ! -z $SHA1 ]; then
STOCKDUMP=/data/stock_boot_${SHA1}.img
if [ -f ${STOCKDUMP}.gz ]; then
ui_print "- Stock boot image backup found"
./magiskboot --decompress ${STOCKDUMP}.gz stock_boot.img
./magiskboot --unpack stock_boot.img
rm -f stock_boot.img
OK=true
fi
fi
fi
if ! $OK; then
ui_print "! Ramdisk restoration incomplete"
ui_print "! Will still try to continue installation"
fi
cp -af ramdisk.cpio ramdisk.cpio.orig
;;
2 ) # Other patched
ui_print "! Boot image patched by other programs!"
abort "! Please restore stock boot image"
;;
esac
##########################################################################################
# Ramdisk patches
##########################################################################################
ui_print "- Patching ramdisk"
if [ ! -z $SHA1 ]; then
cp init.magisk.rc init.magisk.rc.bak
echo "# STOCKSHA1=$SHA1" >> init.magisk.rc
fi
if $SKIP_INITRAMFS; then
cpio_add 750 init magiskinit
cpio_mkdir 000 overlay
cpio_add 750 overlay/init.magisk.rc init.magisk.rc
cpio_mkdir 750 overlay/sbin
cpio_add 755 overlay/sbin/magisk magisk
else
./magiskboot --cpio-patch ramdisk.cpio $KEEPVERITY $KEEPFORCEENCRYPT
cpio_extract sepolicy sepolicy
./magisk magiskpolicy --load sepolicy --save sepolicy --minimal
cpio_add 644 sepolicy sepolicy
rm -f sepolicy
cpio_add 750 init.magisk.rc init.magisk.rc
cpio_add 755 sbin/magisk magisk
fi
mv init.magisk.rc.bak init.magisk.rc 2>/dev/null
# Create ramdisk backups
./magiskboot --cpio-backup ramdisk.cpio ramdisk.cpio.orig
if ! $KEEPVERITY && [ -f dtb ]; then
./magiskboot --dtb-patch dtb && ui_print "- Patching fstab in dtb to remove dm-verity"
fi
rm -f ramdisk.cpio.orig
##########################################################################################
# Repack and flash
##########################################################################################
# Hexpatches
# Remove Samsung RKP in stock kernel
./magiskboot --hexpatch kernel \
49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
# skip_initramfs -> want_initramfs
$SKIP_INITRAMFS && ./magiskboot --hexpatch kernel \
736B69705F696E697472616D6673 \
77616E745F696E697472616D6673
ui_print "- Repacking boot image"
./magiskboot --repack "$BOOTIMAGE" || abort "! Unable to repack boot image!"
# Sign chromeos boot
$CHROMEOS && sign_chromeos
./magiskboot --cleanup