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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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# Detect whether in boot mode
ps | grep zygote | grep -v grep >/dev/null && BOOTMODE=true || BOOTMODE=false
$BOOTMODE || ps -A 2>/dev/null | grep zygote | grep -v grep >/dev/null && BOOTMODE=true
$BOOTMODE || id | grep -q 'uid=0' || BOOTMODE=true
# Default location, will override if needed
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MAGISKBIN=/data/adb/magisk
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[ -z $MOUNTPATH ] && MOUNTPATH=/sbin/.core/img
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[ -z $IMG ] && IMG=/data/adb/magisk.img
BOOTSIGNER="/system/bin/dalvikvm -Xnodex2oat -Xnoimage-dex2oat -cp \$APK com.topjohnwu.magisk.utils.BootSigner"
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BOOTSIGNED=false
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get_outfd() {
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if [ -z $OUTFD ] || readlink /proc/$$/fd/$OUTFD | grep -q /tmp; then
# We will have to manually find out OUTFD
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for FD in `ls /proc/$$/fd`; do
if readlink /proc/$$/fd/$FD | grep -q pipe; then
if ps | grep -v grep | grep -q " 3 $FD "; then
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OUTFD=$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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toupper() {
echo "$@" | tr '[:lower:]' '[:upper:]'
}
find_block() {
for BLOCK in "$@"; do
DEVICE=`find /dev/block -type l -iname $BLOCK | head -n 1` 2>/dev/null
if [ ! -z $DEVICE ]; then
readlink -f $DEVICE
return 0
fi
done
# Fallback by parsing sysfs uevents
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for uevent in /sys/dev/block/*/uevent; do
local DEVNAME=`grep_prop DEVNAME $uevent`
local PARTNAME=`grep_prop PARTNAME $uevent`
for p in "$@"; do
if [ "`toupper $p`" = "`toupper $PARTNAME`" ]; then
echo /dev/block/$DEVNAME
return 0
fi
done
done
return 1
}
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mount_partitions() {
# Check A/B slot
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SLOT=`grep_cmdline androidboot.slot_suffix`
if [ -z $SLOT ]; then
SLOT=_`grep_cmdline androidboot.slot`
[ $SLOT = "_" ] && SLOT=
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fi
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[ -z $SLOT ] || ui_print "- Current boot slot: $SLOT"
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ui_print "- Mounting /system, /vendor"
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[ -f /system/build.prop ] || is_mounted /system || mount -o ro /system 2>/dev/null
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if ! is_mounted /system && ! [ -f /system/build.prop ]; then
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SYSTEMBLOCK=`find_block system$SLOT`
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mount -t ext4 -o ro $SYSTEMBLOCK /system
fi
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[ -f /system/build.prop ] || is_mounted /system || abort "! Cannot mount /system"
cat /proc/mounts | grep -E '/dev/root|/system_root' >/dev/null && SYSTEM_ROOT=true || SYSTEM_ROOT=false
if [ -f /system/init ]; then
SYSTEM_ROOT=true
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mkdir /system_root 2>/dev/null
mount --move /system /system_root
mount -o bind /system_root/system /system
fi
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$SYSTEM_ROOT && ui_print "- Device using system_root_image"
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if [ -L /system/vendor ]; then
# Seperate /vendor partition
is_mounted /vendor || mount -o ro /vendor 2>/dev/null
if ! is_mounted /vendor; then
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VENDORBLOCK=`find_block vendor$SLOT`
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mount -t ext4 -o ro $VENDORBLOCK /vendor
fi
is_mounted /vendor || abort "! Cannot mount /vendor"
fi
}
get_flags() {
# override variables
getvar KEEPVERITY
getvar KEEPFORCEENCRYPT
HIGHCOMP=false
if [ -z $KEEPVERITY ]; then
KEEPVERITY=false
hardware=`grep_cmdline androidboot.hardware`
for hw in taimen walleye; do
if [ "$hw" = "$hardware" ]; then
KEEPVERITY=true
ui_print "- Device on whitelist, keep avb-verity"
break
fi
done
fi
if [ -z $KEEPFORCEENCRYPT ]; then
if [ "`getprop ro.crypto.state`" = "encrypted" ]; then
KEEPFORCEENCRYPT=true
ui_print "- Encrypted data detected, keep forceencrypt"
else
KEEPFORCEENCRYPT=false
fi
fi
}
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grep_cmdline() {
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local REGEX="s/^$1=//p"
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sed -E 's/ +/\n/g' /proc/cmdline | sed -n "$REGEX" 2>/dev/null
}
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grep_prop() {
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local REGEX="s/^$1=//p"
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shift
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local FILES=$@
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[ -z "$FILES" ] && FILES='/system/build.prop'
sed -n "$REGEX" $FILES 2>/dev/null | head -n 1
}
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getvar() {
local VARNAME=$1
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local VALUE=
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VALUE=`grep_prop $VARNAME /.backup/.magisk /data/.magisk /cache/.magisk /system/.magisk`
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[ ! -z $VALUE ] && eval $VARNAME=\$VALUE
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}
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run_migrations() {
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# Update the broken boot backup
if [ -f /data/stock_boot_.img.gz ]; then
$MAGISKBIN/magiskboot --decompress /data/stock_boot_.img.gz /data/stock_boot.img
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fi
# Update our previous backup to new format if exists
if [ -f /data/stock_boot.img ]; then
ui_print "- Migrating boot image backup"
SHA1=`$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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# Move the stock backups
if [ -f /data/magisk/stock_boot* ]; then
mv /data/magisk/stock_boot* /data 2>/dev/null
fi
if [ -f /data/adb/magisk/stock_boot* ]; then
mv /data/adb/magisk/stock_boot* /data 2>/dev/null
fi
# Remove old dbs
rm -f /data/user*/*/magisk.db
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[ -L /data/magisk.img ] || mv /data/magisk.img /data/adb/magisk.img 2>/dev/null
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}
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find_boot_image() {
BOOTIMAGE=
if [ ! -z $SLOT ]; then
BOOTIMAGE=`find_block boot$SLOT ramdisk$SLOT`
else
BOOTIMAGE=`find_block boot ramdisk boot_a kern-a android_boot kernel lnx bootimg`
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fi
if [ -z $BOOTIMAGE ]; then
# Lets see what fstabs tells me
BOOTIMAGE=`grep -v '#' /etc/*fstab* | grep -E '/boot[^a-zA-Z]' | grep -oE '/dev/[a-zA-Z0-9_./-]*' | head -n 1`
fi
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}
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flash_boot_image() {
# Make sure all blocks are writable
$MAGISKBIN/magisk --unlock-blocks 2>/dev/null
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case "$1" in
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*.gz) COMMAND="gzip -d < '$1'";;
*) COMMAND="cat '$1'";;
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esac
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if $BOOTSIGNED; then
SIGNCOM="$BOOTSIGNER -sign"
ui_print "- Sign boot image with test keys"
else
SIGNCOM="cat -"
fi
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case "$2" in
/dev/block/*)
ui_print "- Flashing new boot image"
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eval $COMMAND | eval $SIGNCOM | cat - /dev/zero 2>/dev/null | dd of="$2" bs=4096 2>/dev/null
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;;
*)
ui_print "- Storing new boot image"
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eval $COMMAND | eval $SIGNCOM | dd of="$2" bs=4096 2>/dev/null
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;;
esac
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}
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find_dtbo_image() {
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DTBOIMAGE=`find_block dtbo$SLOT`
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}
patch_dtbo_image() {
if [ ! -z $DTBOIMAGE ]; then
if $MAGISKBIN/magiskboot --dtb-test $DTBOIMAGE; then
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ui_print "- Backing up stock DTBO image"
$MAGISKBIN/magiskboot --compress $DTBOIMAGE $MAGISKBIN/stock_dtbo.img.gz
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ui_print "- Patching DTBO to remove avb-verity"
$MAGISKBIN/magiskboot --dtb-patch $DTBOIMAGE
return 0
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fi
fi
return 1
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}
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sign_chromeos() {
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ui_print "- Signing ChromeOS boot image"
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echo > empty
./chromeos/futility vbutil_kernel --pack new-boot.img.signed \
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--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() {
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cat /proc/mounts | grep -q " `readlink -f $1` " 2>/dev/null
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return $?
}
remove_system_su() {
if [ -f /system/bin/su -o -f /system/xbin/su ] && [ ! -f /su/bin/su ]; then
ui_print "! System installed root detected, mount rw :("
mount -o rw,remount /system
# SuperSU
if [ -e /system/bin/.ext/.su ]; then
mv -f /system/bin/app_process32_original /system/bin/app_process32 2>/dev/null
mv -f /system/bin/app_process64_original /system/bin/app_process64 2>/dev/null
mv -f /system/bin/install-recovery_original.sh /system/bin/install-recovery.sh 2>/dev/null
cd /system/bin
if [ -e app_process64 ]; then
ln -sf app_process64 app_process
else
ln -sf app_process32 app_process
fi
fi
rm -rf /system/.pin /system/bin/.ext /system/etc/.installed_su_daemon /system/etc/.has_su_daemon \
/system/xbin/daemonsu /system/xbin/su /system/xbin/sugote /system/xbin/sugote-mksh /system/xbin/supolicy \
/system/bin/app_process_init /system/bin/su /cache/su /system/lib/libsupol.so /system/lib64/libsupol.so \
/system/su.d /system/etc/install-recovery.sh /system/etc/init.d/99SuperSUDaemon /cache/install-recovery.sh \
/system/.supersu /cache/.supersu /data/.supersu \
/system/app/Superuser.apk /system/app/SuperSU /cache/Superuser.apk 2>/dev/null
fi
}
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api_level_arch_detect() {
API=`grep_prop ro.build.version.sdk`
ABI=`grep_prop ro.product.cpu.abi | cut -c-3`
ABI2=`grep_prop ro.product.cpu.abi2 | cut -c-3`
ABILONG=`grep_prop ro.product.cpu.abi`
ARCH=arm
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ARCH32=arm
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IS64BIT=false
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if [ "$ABI" = "x86" ]; then ARCH=x86; ARCH32=x86; fi;
if [ "$ABI2" = "x86" ]; then ARCH=x86; ARCH32=x86; fi;
if [ "$ABILONG" = "arm64-v8a" ]; then ARCH=arm64; ARCH32=arm; IS64BIT=true; fi;
if [ "$ABILONG" = "x86_64" ]; then ARCH=x64; ARCH32=x86; IS64BIT=true; fi;
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}
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check_data() {
DATA=false
DATA_DE=false
if grep ' /data ' /proc/mounts | grep -vq 'tmpfs'; then
# Test if data is writable
touch /data/.rw && rm /data/.rw && DATA=true
# Test if DE storage is writable
$DATA && [ -d /data/adb ] && touch /data/adb/.rw && rm /data/adb/.rw && DATA_DE=true
fi
}
setup_bb() {
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if [ -x /sbin/.core/busybox/busybox ]; then
# Make sure this path is in the front
echo $PATH | grep -q '^/sbin/.core/busybox' || export PATH=/sbin/.core/busybox:$PATH
elif [ -x $TMPDIR/bin/busybox ]; then
# Make sure this path is in the front
echo $PATH | grep -q "^$TMPDIR/bin" || export PATH=$TMPDIR/bin:$PATH
else
# Construct the 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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boot_actions() {
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if [ ! -d /sbin/.core/mirror/bin ]; then
mkdir -p /sbin/.core/mirror/bin
mount -o bind $MAGISKBIN /sbin/.core/mirror/bin
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fi
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MAGISKBIN=/sbin/.core/mirror/bin
setup_bb
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}
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recovery_actions() {
# TWRP bug fix
mount -o bind /dev/urandom /dev/random
# Preserve environment varibles
OLD_PATH=$PATH
setup_bb
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# Temporarily block out all custom recovery binaries/libs
mv /sbin /sbin_tmp
# Unset library paths
OLD_LD_LIB=$LD_LIBRARY_PATH
OLD_LD_PRE=$LD_PRELOAD
unset LD_LIBRARY_PATH
unset LD_PRELOAD
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}
recovery_cleanup() {
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mv /sbin_tmp /sbin 2>/dev/null
[ -z $OLD_PATH ] || export PATH=$OLD_PATH
[ -z $OLD_LD_LIB ] || export LD_LIBRARY_PATH=$OLD_LD_LIB
[ -z $OLD_LD_PRE ] || export LD_PRELOAD=$OLD_LD_PRE
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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() {
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chown $2:$3 $1 || return 1
chmod $4 $1 || return 1
[ -z $5 ] && chcon 'u:object_r:system_file:s0' $1 || chcon $5 $1 || return 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 -ms $1 | cut -f1`
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}
request_zip_size_check() {
reqSizeM=`unzip -l "$1" | tail -n 1 | awk '{ print int(($1 - 1) / 1048576 + 1) }'`
}
check_filesystem() {
curSizeM=`wc -c < $1`
curSizeM=$((curSizeM / 1048576))
local DF=`df -P $2 | grep $2`
curUsedM=`echo $DF | awk '{ print int($3 / 1024) }'`
curFreeM=`echo $DF | awk '{ print int($4 / 1024) }'`
}
mount_snippet() {
MAGISKLOOP=`$MAGISKBIN/magisk imgtool mount $IMG $MOUNTPATH`
is_mounted $MOUNTPATH || abort "! $IMG mount failed..."
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}
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mount_magisk_img() {
[ -z reqSizeM ] && reqSizeM=0
mkdir -p $MOUNTPATH 2>/dev/null
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if [ -f "$IMG" ]; then
ui_print "- Found $IMG"
mount_snippet
check_filesystem $IMG $MOUNTPATH
if [ $reqSizeM -gt $curFreeM ]; then
newSizeM=$(((curSizeM + reqSizeM - curFreeM) / 32 * 32 + 64))
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ui_print "- Resizing $IMG to ${newSizeM}M"
$MAGISKBIN/magisk imgtool umount $MOUNTPATH $MAGISKLOOP
$MAGISKBIN/magisk imgtool resize $IMG $newSizeM >&2
mount_snippet
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fi
ui_print "- Mount $IMG to $MOUNTPATH"
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else
newSizeM=$((reqSizeM / 32 * 32 + 64))
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ui_print "- Creating $IMG with size ${newSizeM}M"
$MAGISKBIN/magisk imgtool create $IMG $newSizeM >&2
mount_snippet
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fi
}
unmount_magisk_img() {
check_filesystem $IMG $MOUNTPATH
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newSizeM=$((curUsedM / 32 * 32 + 64))
$MAGISKBIN/magisk imgtool umount $MOUNTPATH $MAGISKLOOP
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if [ $curSizeM -gt $newSizeM ]; then
ui_print "- Shrinking $IMG to ${newSizeM}M"
$MAGISKBIN/magisk imgtool resize $IMG $newSizeM >&2
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fi
}