Magisk/scripts/boot_patch.sh

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#!/system/bin/sh
##########################################################################################
#
# Magisk Boot Image Patcher
# by topjohnwu
#
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# This script should be placed in a directory with the following files:
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#
# 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
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# , and patch the ramdisk for Magisk support
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# init.magisk.rc script A new line will be added to init.rc to import this script.
# All magisk entrypoints are defined here
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# chromeos folder This folder should store all the utilities and keys to sign
# (optional) a chromeos device, used in the tablet Pixel C
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#
# 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
#
##########################################################################################
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##########################################################################################
# Functions
##########################################################################################
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# 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"
}
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# 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
}
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# Pure bash dirname implementation
dirname_wrap() {
if echo $1 | grep "/" >/dev/null 2>&1; then
RES=${1%/*}
[ -z $RES ] && echo "/" || echo $RES
else
echo "."
fi
}
# Pure bash basename implementation
basename_wrap() {
echo ${1##*/}
}
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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
}
# --cpio-add <incpio> <mode> <entry> <infile>
cpio_add() {
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./magiskboot --cpio-add ramdisk.cpio $1 $2 $3
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}
# --cpio-extract <incpio> <entry> <outfile>
cpio_extract() {
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./magiskboot --cpio-extract ramdisk.cpio $1 $2
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}
# --cpio-mkdir <incpio> <mode> <entry>
cpio_mkdir() {
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./magiskboot --cpio-mkdir ramdisk.cpio $1 $2
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}
##########################################################################################
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# Initialization
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##########################################################################################
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CWD=`pwd`
cd "`dirname_wrap $1`"
BOOTIMAGE="`pwd`/`basename_wrap $1`"
cd "$CWD"
if [ -z "$BOOTIMAGE" ]; then
ui_print_wrap "This script requires a boot image as a parameter"
exit 1
fi
# Presets
[ -z $KEEPVERITY ] && KEEPVERITY=false
[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
# Detect whether running as root
[ `id -u` -eq 0 ] && ROOT=true || ROOT=false
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# Switch to the location of the script file
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[ -z $SOURCEDMODE ] && cd "`dirname_wrap "${BASH_SOURCE:-$0}"`"
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chmod +x ./*
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##########################################################################################
# Unpack
##########################################################################################
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ui_print_wrap "- Unpacking boot image"
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./magiskboot --unpack "$BOOTIMAGE"
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case $? in
1 )
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abort_wrap "! Unable to unpack boot image"
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;;
2 )
ui_print_wrap "! Sony ELF32 format detected"
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abort_wrap "! Please use BootBridge from @AdrianDC to flash Magisk"
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;;
3 )
ui_print_wrap "! Sony ELF64 format detected"
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abort_wrap "! Stock kernel cannot be patched, please use a custom kernel"
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esac
##########################################################################################
# Ramdisk restores
##########################################################################################
# Test patch status and do restore, after this section, ramdisk.cpio.orig is guaranteed to exist
ui_print_wrap "- Checking ramdisk status"
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./magiskboot --cpio-test ramdisk.cpio
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case $? in
0 ) # Stock boot
ui_print_wrap "- Stock boot image detected!"
ui_print_wrap "- Backing up stock boot image"
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SHA1=`./magiskboot --sha1 "$BOOTIMAGE" | tail -n 1`
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STOCKDUMP=stock_boot_${SHA1}.img
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dd if="$BOOTIMAGE" of=$STOCKDUMP
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./magiskboot --compress $STOCKDUMP
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cp -af ramdisk.cpio ramdisk.cpio.orig
;;
1 ) # Magisk patched
ui_print_wrap "- Magisk patched image detected!"
# Find SHA1 of stock boot image
if [ -z $SHA1 ]; then
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./magiskboot --cpio-extract ramdisk.cpio init.magisk.rc init.magisk.rc.old
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SHA1=`grep_prop "# STOCKSHA1" init.magisk.rc.old`
rm -f init.magisk.rc.old
fi
OK=false
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./magiskboot --cpio-restore ramdisk.cpio
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if [ $? -eq 0 ]; then
ui_print_wrap "- Ramdisk restored from internal backup"
OK=true
else
# Restore failed
ui_print_wrap "! 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_wrap "- Stock boot image backup found"
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./magiskboot --decompress ${STOCKDUMP}.gz stock_boot.img
./magiskboot --unpack stock_boot.img
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rm -f stock_boot.img
OK=true
fi
fi
fi
if ! $OK; then
ui_print_wrap "! Ramdisk restoration incomplete"
ui_print_wrap "! Will still try to continue installation"
fi
cp -af ramdisk.cpio ramdisk.cpio.orig
;;
2 ) # Other patched
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ui_print_wrap "! Boot image patched by other programs!"
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abort_wrap "! Please restore stock boot image"
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;;
esac
##########################################################################################
# Ramdisk patches
##########################################################################################
ui_print_wrap "- Patching ramdisk"
# Add magisk entrypoint
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./magiskboot --cpio-patch ramdisk.cpio $KEEPVERITY $KEEPFORCEENCRYPT
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# sepolicy patches
cpio_extract sepolicy sepolicy
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./magisk magiskpolicy --load sepolicy --save sepolicy --minimal
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cpio_add 644 sepolicy sepolicy
rm -f sepolicy
# Add new items
if [ ! -z $SHA1 ]; then
cp init.magisk.rc init.magisk.rc.bak
echo "# STOCKSHA1=$SHA1" >> init.magisk.rc
fi
cpio_add 750 init.magisk.rc init.magisk.rc
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mv init.magisk.rc.bak init.magisk.rc 2>/dev/null
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cpio_add 755 sbin/magisk magisk
# Create ramdisk backups
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./magiskboot --cpio-backup ramdisk.cpio ramdisk.cpio.orig
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rm -f ramdisk.cpio.orig
##########################################################################################
# Repack and flash
##########################################################################################
# Hexpatches
# Remove Samsung RKP in stock kernel
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./magiskboot --hexpatch kernel \
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49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
ui_print_wrap "- Repacking boot image"
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./magiskboot --repack "$BOOTIMAGE" || abort_wrap "! Unable to repack boot image!"
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# Sign chromeos boot
if [ -f chromeos ]; then
echo > empty
./chromeos/futility vbutil_kernel --pack new-boot.img.signed \
--keyblock ./chromeos/kernel.keyblock --signprivate ./chromeos/kernel_data_key.vbprivk \
--version 1 --vmlinuz new-boot.img --config empty --arch arm --bootloader empty --flags 0x1
rm -f empty new-boot.img
mv new-boot.img.signed new-boot.img
fi
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./magiskboot --cleanup