Magisk/scripts/update_binary.sh

#!/sbin/sh

TMPDIR=/dev/tmp
rm -rf $TMPDIR
mkdir -p $TMPDIR 2>/dev/null

export BBBIN=$TMPDIR/busybox
unzip -o "$3" lib/x86/libbusybox.so lib/armeabi-v7a/libbusybox.so -d $TMPDIR >&2
chmod -R 755 $TMPDIR/lib
mv -f $TMPDIR/lib/x86/libbusybox.so $BBBIN
$BBBIN >/dev/null 2>&1 || mv -f $TMPDIR/lib/armeabi-v7a/libbusybox.so $BBBIN
$BBBIN rm -rf $TMPDIR/lib

export INSTALLER=$TMPDIR/install
$BBBIN mkdir -p $INSTALLER
$BBBIN unzip -o "$3" "assets/*" "lib/*" "META-INF/com/google/*" -x "lib/*/libbusybox.so" -d $INSTALLER >&2
export ASH_STANDALONE=1
if echo "$3" | $BBBIN grep -q "uninstall"; then
  exec $BBBIN sh "$INSTALLER/assets/uninstaller.sh" "$@"
else
  exec $BBBIN sh "$INSTALLER/META-INF/com/google/android/updater-script" "$@"
fi