195 lines
6.2 KiB
Bash
195 lines
6.2 KiB
Bash
#!/system/bin/sh
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##########################################################################################
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#
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# Magisk Boot Image Patcher
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# 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.
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# (this file) The script will use binaries and files in its same directory
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# to complete the patching process
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# 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
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# chromeos folder This folder should store all the utilities and keys to sign
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# (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
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# or have a backup included in ramdisk internally, since we cannot access the stock boot
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# image placed under /data we've created when previously installed
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#
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##########################################################################################
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##########################################################################################
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# Functions
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##########################################################################################
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# Pure bash dirname implementation
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dirname_wrap() {
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case "$1" in
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*/*)
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dir=${1%/*}
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[ -z $dir ] && echo "/" || echo $dir
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;;
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*)
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echo "."
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;;
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esac
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}
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# Pure bash basename implementation
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basename_wrap() {
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echo ${1##*/}
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}
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##########################################################################################
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# Initialization
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##########################################################################################
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if [ -z $SOURCEDMODE ]; then
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# Switch to the location of the script file
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cd "`dirname_wrap "${BASH_SOURCE:-$0}"`"
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# Load utility functions
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. ./util_functions.sh
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# Detect current status
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mount_partitions
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fi
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BOOTIMAGE="$1"
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[ -e "$BOOTIMAGE" ] || abort "$BOOTIMAGE does not exist!"
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# Presets
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[ -z $KEEPVERITY ] && KEEPVERITY=false
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[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
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chmod -R 755 .
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# Extract magisk if doesn't exist
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[ -e magisk ] || ./monogisk -x magisk magisk
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##########################################################################################
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# Unpack
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##########################################################################################
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migrate_boot_backup
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CHROMEOS=false
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ui_print "- Unpacking boot image"
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./magiskboot --unpack "$BOOTIMAGE"
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case $? in
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1 )
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abort "! Unable to unpack boot image"
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;;
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2 )
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ui_print "- ChromeOS boot image detected"
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CHROMEOS=true
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;;
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3 )
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ui_print "! Sony ELF32 format detected"
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abort "! Please use BootBridge from @AdrianDC to flash Magisk"
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;;
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4 )
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ui_print "! Sony ELF64 format detected"
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abort "! Stock kernel cannot be patched, please use a custom kernel"
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esac
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##########################################################################################
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# Ramdisk restores
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##########################################################################################
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# 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"
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./magiskboot --cpio-test ramdisk.cpio
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case $? in
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0 ) # Stock boot
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ui_print "- Stock boot image detected!"
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ui_print "- Backing up stock boot image"
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SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
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STOCKDUMP=stock_boot_${SHA1}.img
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dd if="$BOOTIMAGE" of=$STOCKDUMP
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./magiskboot --compress $STOCKDUMP
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cp -af ramdisk.cpio ramdisk.cpio.orig
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;;
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1 ) # Magisk patched
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ui_print "- Magisk patched image detected!"
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# Find SHA1 of stock boot image
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[ -z $SHA1 ] && SHA1=`./magiskboot --cpio-stocksha1 ramdisk.cpio 2>/dev/null`
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OK=false
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./magiskboot --cpio-restore ramdisk.cpio
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if [ $? -eq 0 ]; then
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ui_print "- Ramdisk restored from internal backup"
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OK=true
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else
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# Restore failed
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ui_print "! Cannot restore from internal backup"
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# If we are root and SHA1 known, we try to find the stock backup
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if [ ! -z $SHA1 ]; then
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STOCKDUMP=/data/stock_boot_${SHA1}.img
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if [ -f ${STOCKDUMP}.gz ]; then
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ui_print "- Stock boot image backup found"
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./magiskboot --decompress ${STOCKDUMP}.gz stock_boot.img
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./magiskboot --unpack stock_boot.img
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rm -f stock_boot.img
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OK=true
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fi
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fi
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fi
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if ! $OK; then
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ui_print "! Ramdisk restoration incomplete"
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ui_print "! Will still try to continue installation"
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fi
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cp -af ramdisk.cpio ramdisk.cpio.orig
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;;
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2 ) # Other patched
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ui_print "! Boot image patched by other programs!"
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abort "! Please restore stock boot image"
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;;
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esac
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##########################################################################################
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# Ramdisk patches
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##########################################################################################
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ui_print "- Patching ramdisk"
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./magiskboot --cpio-add ramdisk.cpio 750 init monogisk
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./magiskboot --cpio-patch ramdisk.cpio $KEEPVERITY $KEEPFORCEENCRYPT
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# Create ramdisk backups
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./magiskboot --cpio-backup ramdisk.cpio ramdisk.cpio.orig $SHA1
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if ! $KEEPVERITY && [ -f dtb ]; then
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./magiskboot --dtb-patch dtb && ui_print "- Patching fstab in dtb to remove dm-verity"
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fi
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rm -f ramdisk.cpio.orig
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##########################################################################################
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# Repack and flash
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##########################################################################################
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# Hexpatches
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# Remove Samsung RKP in stock kernel
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./magiskboot --hexpatch kernel \
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49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
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A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
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# skip_initramfs -> want_initramfs
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./magiskboot --hexpatch kernel \
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736B69705F696E697472616D6673 \
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77616E745F696E697472616D6673
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ui_print "- Repacking boot image"
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./magiskboot --repack "$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
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