Magisk/scripts/update_binary.sh

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# EX_ARM, EX_X86, BB_ARM, and BB_X86 should be generated in build.py
dirname_wrap() {
case "$1" in
*/*) dir=${1%/*}; [ -z $dir ] && echo "/" || echo $dir ;;
*) echo "." ;;
esac
}
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[ "$1" = "indep" ] && INDEP=true || INDEP=false
$INDEP && TMPDIR="`cd "\`dirname_wrap "${BASH_SOURCE:-$0}"\`" && pwd`" || TMPDIR=/dev/tmp
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INSTALLER=$TMPDIR/install; BBDIR=$TMPDIR/bin
EXBIN=$BBDIR/b64xz; BBBIN=$BBDIR/busybox
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$INDEP || rm -rf $TMPDIR 2>/dev/null;
mkdir -p $BBDIR 2>/dev/null
touch $EXBIN $BBBIN; chmod 755 $EXBIN $BBBIN
echo -ne $EX_ARM > $EXBIN
if $EXBIN --test 2>/dev/null; then
echo $BB_ARM | $EXBIN > $BBBIN
else
echo -ne $EX_x86 > $EXBIN
echo $BB_x86 | $EXBIN > $BBBIN
fi
$BBBIN --install -s $TMPDIR/bin
export PATH=$BBDIR:$PATH
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if $INDEP; then
shift
exec sh "$@"
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else
mkdir -p $INSTALLER
unzip -o "$3" -d $INSTALLER
exec sh $INSTALLER/META-INF/com/google/android/updater-script $@
fi