Magisk/scripts/boot_patch.sh

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#!/system/bin/sh
##########################################################################################
#
# Magisk Boot Image Patcher
# by topjohnwu
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#
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# This script should be placed in a directory with the following files:
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#
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# File name type Description
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#
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# 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
# monogisk binary The monolithic binary to replace /init
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# magiskboot binary A tool to unpack boot image, decompress ramdisk, extract ramdisk
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# , and patch the ramdisk for Magisk support
# 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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#
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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 installed
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#
##########################################################################################
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##########################################################################################
# Functions
##########################################################################################
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# Pure bash dirname implementation
dirname_wrap() {
case "$1" in
*/*)
dir=${1%/*}
[ -z $dir ] && echo "/" || echo $dir
;;
*)
echo "."
;;
esac
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}
# Pure bash basename implementation
basename_wrap() {
echo ${1##*/}
}
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##########################################################################################
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# Initialization
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##########################################################################################
if [ -z $SOURCEDMODE ]; then
# Switch to the location of the script file
cd "`dirname_wrap "${BASH_SOURCE:-$0}"`"
# Load utility functions
. ./util_functions.sh
fi
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BOOTIMAGE="$1"
[ -e "$BOOTIMAGE" ] || abort "$BOOTIMAGE does not exist!"
# Presets
[ -z $KEEPVERITY ] && KEEPVERITY=false
[ -z $HIGHCOMP ] && HIGHCOMP=false
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if [ -z $KEEPFORCEENCRYPT ]; then
if [ "`getprop ro.crypto.state`" = "encrypted" ]; then
KEEPFORCEENCRYPT=true
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ui_print "- Encrypted data detected, keep forceencrypt"
else
KEEPFORCEENCRYPT=false
fi
fi
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chmod -R 755 .
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# Extract magisk if doesn't exist
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[ -e magisk ] || ./magiskinit -x magisk magisk
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##########################################################################################
# Unpack
##########################################################################################
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CHROMEOS=false
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ui_print "- Unpacking boot image"
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./magiskboot --unpack "$BOOTIMAGE"
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case $? in
1 )
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abort "! Unable to unpack boot image"
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;;
2 )
HIGHCOMP=true
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;;
3 )
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ui_print "- ChromeOS boot image detected"
CHROMEOS=true
;;
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4 )
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ui_print "! Sony ELF32 format detected"
abort "! Please use BootBridge from @AdrianDC to flash Magisk"
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;;
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5 )
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ui_print "! Sony ELF64 format detected"
abort "! 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
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ui_print "- Checking ramdisk status"
MAGISK_PATCHED=false
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./magiskboot --cpio ramdisk.cpio test
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case $? in
0 ) # Stock boot
ui_print "- Stock boot image detected"
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ui_print "- Backing up stock boot image"
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SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
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STOCKDUMP=stock_boot_${SHA1}.img.gz
./magiskboot --compress "$BOOTIMAGE" $STOCKDUMP
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cp -af ramdisk.cpio ramdisk.cpio.orig
;;
1 ) # Magisk patched
MAGISK_PATCHED=true
HIGHCOMP=false
;;
2 ) # High compression mode
MAGISK_PATCHED=true
HIGHCOMP=true
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;;
3 ) # Other patched
ui_print "! Boot image patched by other programs"
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abort "! Please restore stock boot image"
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;;
esac
if $MAGISK_PATCHED; then
ui_print "- Magisk patched image detected"
# Find SHA1 of stock boot image
[ -z $SHA1 ] && SHA1=`./magiskboot --cpio ramdisk.cpio sha1 2>/dev/null`
./magiskboot --cpio ramdisk.cpio restore
cp -af ramdisk.cpio ramdisk.cpio.orig
fi
if $HIGHCOMP; then
ui_print "! Insufficient boot partition size detected"
ui_print "- Enable high compression mode"
fi
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##########################################################################################
# Ramdisk patches
##########################################################################################
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ui_print "- Patching ramdisk"
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./magiskboot --cpio ramdisk.cpio \
'add 750 init magiskinit' \
"magisk ramdisk.cpio.orig $HIGHCOMP $KEEPVERITY $KEEPFORCEENCRYPT $SHA1"
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rm -f ramdisk.cpio.orig
##########################################################################################
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# Binary patches
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##########################################################################################
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if ! $KEEPVERITY && [ -f dtb ]; then
./magiskboot --dtb-patch dtb && ui_print "- Patching fstab in dtb to remove dm-verity"
fi
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if [ -f kernel ]; then
# Remove Samsung RKP in stock kernel
./magiskboot --hexpatch kernel \
49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
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# skip_initramfs -> want_initramfs
./magiskboot --hexpatch kernel \
736B69705F696E697472616D6673 \
77616E745F696E697472616D6673
fi
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##########################################################################################
# Repack and flash
##########################################################################################
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ui_print "- Repacking boot image"
./magiskboot --repack "$BOOTIMAGE" || abort "! Unable to repack boot image!"
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# Sign chromeos boot
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$CHROMEOS && sign_chromeos
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./magiskboot --cleanup