This file is indexed.

/bin/is_aufs is in fsprotect 1.0.6.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Check if a file system is a unionfs
# $1 = path

[ -z "$1" ] && exit 1

[ -e "/proc/mounts" ] || exit 1

if [ "x$1" = "x/" ] ; then
	T="$1"
else
	T="${1%/}"
fi

T=`grep "^[^ ]* $T aufs" /proc/mounts`

[ -z "$T" ] && exit 1

exit 0