Magisk/scripts/update_binary.sh

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#!/sbin/sh
X86_CNT=__X86_CNT__
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extract_bb() {
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touch "$BBBIN"
chmod 755 "$BBBIN"
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dd if="$0" of="$BBBIN" bs=1024 skip=1 count=$X86_CNT
"$BBBIN" >/dev/null 2>&1 || dd if="$0" of="$BBBIN" bs=1024 skip=$(($X86_CNT + 1))
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}
setup_bb() {
mkdir -p $TMPDIR 2>/dev/null
BBBIN=$TMPDIR/busybox
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extract_bb
}
export BBBIN
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case "$1" in
"extract"|"-x")
[ -z "$2" ] && BBBIN=./busybox || BBBIN="$2"
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extract_bb
;;
"sh")
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TMPDIR=.
setup_bb
shift
exec ./busybox sh -o standalone "$@"
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;;
*)
TMPDIR=/dev/tmp
rm -rf $TMPDIR 2>/dev/null
setup_bb
export INSTALLER=$TMPDIR/install
$BBBIN mkdir -p $INSTALLER
$BBBIN unzip -o "$3" -d $INSTALLER >&2
exec $BBBIN sh -o standalone $INSTALLER/META-INF/com/google/android/updater-script "$@"
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;;
esac
exit