Magisk/scripts/util_functions.sh

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##########################################################################################
#
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# Magisk General Utility Functions
# by topjohnwu
#
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# Used everywhere in Magisk
#
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##########################################################################################
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MAGISK_VERSION_STUB
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SCRIPT_VERSION=$MAGISK_VER_CODE
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# Default location, will override if needed
MAGISKBIN=/data/magisk
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get_outfd() {
readlink /proc/$$/fd/$OUTFD 2>/dev/null | grep /tmp >/dev/null
if [ "$?" -eq "0" ]; then
OUTFD=0
for FD in `ls /proc/$$/fd`; do
readlink /proc/$$/fd/$FD 2>/dev/null | grep pipe >/dev/null
if [ "$?" -eq "0" ]; then
ps | grep " 3 $FD " | grep -v grep >/dev/null
if [ "$?" -eq "0" ]; then
OUTFD=$FD
break
fi
fi
done
fi
}
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ui_print() {
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$BOOTMODE && echo "$1" || echo -e "ui_print $1\nui_print" >> /proc/self/fd/$OUTFD
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}
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mount_partitions() {
# Check A/B slot
SLOT=`getprop ro.boot.slot_suffix`
[ -z $SLOT ] || ui_print "- A/B partition detected, current slot: $SLOT"
ui_print "- Mounting /system, /vendor"
is_mounted /system || [ -f /system/build.prop ] || mount -o ro /system 2>/dev/null
if ! is_mounted /system && ! [ -f /system/build.prop ]; then
SYSTEMBLOCK=`find /dev/block -iname system$SLOT | head -n 1`
mount -t ext4 -o ro $SYSTEMBLOCK /system
fi
is_mounted /system || [ -f /system/build.prop ] || abort "! Cannot mount /system"
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cat /proc/mounts | grep -E '/dev/root|/system_root' >/dev/null && SKIP_INITRAMFS=true || SKIP_INITRAMFS=false
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if [ -f /system/init.rc ]; then
SKIP_INITRAMFS=true
mkdir /system_root 2>/dev/null
mount --move /system /system_root
mount -o bind /system_root/system /system
fi
$SKIP_INITRAMFS && ui_print "- Device skip_initramfs detected"
if [ -L /system/vendor ]; then
# Seperate /vendor partition
is_mounted /vendor || mount -o ro /vendor 2>/dev/null
if ! is_mounted /vendor; then
VENDORBLOCK=`find /dev/block -iname vendor$SLOT | head -n 1`
mount -t ext4 -o ro $VENDORBLOCK /vendor
fi
is_mounted /vendor || abort "! Cannot mount /vendor"
fi
}
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grep_prop() {
REGEX="s/^$1=//p"
shift
FILES=$@
[ -z "$FILES" ] && FILES='/system/build.prop'
sed -n "$REGEX" $FILES 2>/dev/null | head -n 1
}
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getvar() {
local VARNAME=$1
local VALUE=$(eval echo \$$VARNAME)
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[ ! -z $VALUE ] && return
for DIR in /dev /data /cache /system; do
VALUE=`grep_prop $VARNAME $DIR/.magisk`
[ ! -z $VALUE ] && break;
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done
eval $VARNAME=\$VALUE
}
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resolve_link() {
RESOLVED="$1"
while RESOLVE=`readlink $RESOLVED`; do
RESOLVED=$RESOLVE
done
echo $RESOLVED
}
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find_boot_image() {
if [ -z "$BOOTIMAGE" ]; then
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if [ ! -z $SLOT ]; then
BOOTIMAGE=`find /dev/block -iname boot$SLOT | head -n 1` 2>/dev/null
else
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for BLOCK in boot_a kern-a android_boot kernel boot lnx bootimg; do
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BOOTIMAGE=`find /dev/block -iname $BLOCK | head -n 1` 2>/dev/null
[ ! -z $BOOTIMAGE ] && break
done
fi
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fi
# Recovery fallback
if [ -z "$BOOTIMAGE" ]; then
for FSTAB in /etc/*fstab*; do
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BOOTIMAGE=`grep -v '#' $FSTAB | grep -E '/boot[^a-zA-Z]' | grep -oE '/dev/[a-zA-Z0-9_./-]*'`
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[ ! -z $BOOTIMAGE ] && break
done
fi
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BOOTIMAGE=`resolve_link $BOOTIMAGE`
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}
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migrate_boot_backup() {
# Update the broken boot backup
if [ -f /data/stock_boot_.img.gz ]; then
$MAGISKBIN/magiskboot --decompress /data/stock_boot_.img.gz
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mv /data/stock_boot_.img /data/stock_boot.img
fi
# Update our previous backup to new format if exists
if [ -f /data/stock_boot.img ]; then
ui_print "- Migrating boot image backup"
SHA1=`$MAGISKBIN/magiskboot --sha1 /data/stock_boot.img 2>/dev/null`
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STOCKDUMP=/data/stock_boot_${SHA1}.img
mv /data/stock_boot.img $STOCKDUMP
$MAGISKBIN/magiskboot --compress $STOCKDUMP
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fi
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mv /data/magisk/stock_boot* /data 2>/dev/null
}
flash_boot_image() {
# Make sure all blocks are writable
$MAGISKBIN/magisk --unlock-blocks
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case "$1" in
*.gz) COMMAND="gzip -d < \"$1\"";;
*) COMMAND="cat \"$1\"";;
esac
case "$2" in
/dev/block/*)
ui_print "- Flashing new boot image"
eval $COMMAND | cat - /dev/zero | dd of="$2" bs=4096 >/dev/null 2>&1
;;
*)
ui_print "- Storing new boot image"
eval $COMMAND | dd of="$2" bs=4096 >/dev/null 2>&1
;;
esac
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}
sign_chromeos() {
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ui_print "- Signing ChromeOS boot image"
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echo > empty
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./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
}
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is_mounted() {
if [ ! -z "$2" ]; then
cat /proc/mounts | grep $1 | grep $2, >/dev/null
else
cat /proc/mounts | grep $1 >/dev/null
fi
return $?
}
remove_system_su() {
if [ -f /system/bin/su -o -f /system/xbin/su ] && [ ! -f /su/bin/su ]; then
ui_print "! System installed root detected, mount rw :("
mount -o rw,remount /system
# SuperSU
if [ -e /system/bin/.ext/.su ]; then
mv -f /system/bin/app_process32_original /system/bin/app_process32 2>/dev/null
mv -f /system/bin/app_process64_original /system/bin/app_process64 2>/dev/null
mv -f /system/bin/install-recovery_original.sh /system/bin/install-recovery.sh 2>/dev/null
cd /system/bin
if [ -e app_process64 ]; then
ln -sf app_process64 app_process
else
ln -sf app_process32 app_process
fi
fi
rm -rf /system/.pin /system/bin/.ext /system/etc/.installed_su_daemon /system/etc/.has_su_daemon \
/system/xbin/daemonsu /system/xbin/su /system/xbin/sugote /system/xbin/sugote-mksh /system/xbin/supolicy \
/system/bin/app_process_init /system/bin/su /cache/su /system/lib/libsupol.so /system/lib64/libsupol.so \
/system/su.d /system/etc/install-recovery.sh /system/etc/init.d/99SuperSUDaemon /cache/install-recovery.sh \
/system/.supersu /cache/.supersu /data/.supersu \
/system/app/Superuser.apk /system/app/SuperSU /cache/Superuser.apk 2>/dev/null
fi
}
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api_level_arch_detect() {
API=`grep_prop ro.build.version.sdk`
ABI=`grep_prop ro.product.cpu.abi | cut -c-3`
ABI2=`grep_prop ro.product.cpu.abi2 | cut -c-3`
ABILONG=`grep_prop ro.product.cpu.abi`
ARCH=arm
IS64BIT=false
if [ "$ABI" = "x86" ]; then ARCH=x86; fi;
if [ "$ABI2" = "x86" ]; then ARCH=x86; fi;
if [ "$ABILONG" = "arm64-v8a" ]; then ARCH=arm64; IS64BIT=true; fi;
if [ "$ABILONG" = "x86_64" ]; then ARCH=x64; IS64BIT=true; fi;
}
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boot_actions() {
if [ ! -d /dev/magisk/mirror/bin ]; then
mkdir -p /dev/magisk/mirror/bin
mount -o bind $MAGISKBIN /dev/magisk/mirror/bin
fi
MAGISKBIN=/dev/magisk/mirror/bin
}
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recovery_actions() {
# TWRP bug fix
mount -o bind /dev/urandom /dev/random
# Preserve environment varibles
OLD_PATH=$PATH
OLD_LD_PATH=$LD_LIBRARY_PATH
if [ ! -d $TMPDIR/bin ]; then
# Add busybox to PATH
mkdir -p $TMPDIR/bin
ln -s $MAGISKBIN/busybox $TMPDIR/bin/busybox
$MAGISKBIN/busybox --install -s $TMPDIR/bin
export PATH=$TMPDIR/bin:$PATH
fi
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# Temporarily block out all custom recovery binaries/libs
mv /sbin /sbin_tmp
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# Add all possible library paths
$IS64BIT && export LD_LIBRARY_PATH=/system/lib64:/system/vendor/lib64 || export LD_LIBRARY_PATH=/system/lib:/system/vendor/lib
}
recovery_cleanup() {
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mv /sbin_tmp /sbin 2>/dev/null
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export LD_LIBRARY_PATH=$OLD_LD_PATH
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[ -z $OLD_PATH ] || export PATH=$OLD_PATH
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ui_print "- Unmounting partitions"
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umount -l /system_root 2>/dev/null
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umount -l /system 2>/dev/null
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umount -l /vendor 2>/dev/null
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umount -l /dev/random 2>/dev/null
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}
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abort() {
ui_print "$1"
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$BOOTMODE || recovery_cleanup
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exit 1
}
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set_perm() {
chown $2:$3 $1 || exit 1
chmod $4 $1 || exit 1
[ -z $5 ] && chcon 'u:object_r:system_file:s0' $1 || chcon $5 $1
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}
set_perm_recursive() {
find $1 -type d 2>/dev/null | while read dir; do
set_perm $dir $2 $3 $4 $6
done
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find $1 -type f -o -type l 2>/dev/null | while read file; do
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set_perm $file $2 $3 $5 $6
done
}
mktouch() {
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mkdir -p ${1%/*} 2>/dev/null
[ -z $2 ] && touch $1 || echo $2 > $1
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chmod 644 $1
}
request_size_check() {
reqSizeM=`du -s $1 | cut -f1`
reqSizeM=$((reqSizeM / 1024 + 1))
}
request_zip_size_check() {
reqSizeM=`unzip -l "$1" | tail -n 1 | awk '{ print int($1 / 1048567 + 1) }'`
}
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image_size_check() {
SIZE="`$MAGISKBIN/magisk --imgsize $IMG`"
curUsedM=`echo "$SIZE" | cut -d" " -f1`
curSizeM=`echo "$SIZE" | cut -d" " -f2`
curFreeM=$((curSizeM - curUsedM))
}