#!/bin/bash

# Copyright 2012 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

CUTOFF=40
STATUSDIR=/var/cache/nagios_status
STATUS=${STATUSDIR}/nouser


if [ ! -d ${STATUSDIR} ]; then
        mkdir -p ${STATUSDIR}
fi

tmp=`tempfile`
trap "rm -f '$tmp'" exit

if command -v ionice >/dev/null 2>&1; then
	prefix="ionice -c 3 -t"  # idle priority, ignore errors
fi

$prefix find / -ignore_readdir_race \( -fstype proc -o -fstype sysfs \) -prune -o -nouser | head -n "$CUTOFF" > "$tmp"

if [ -s "$tmp" ]; then
	echo "WARN"
	c="$(wc -l < "$tmp")"
	if [ "$c" -lt "$CUTOFF" ] ; then
		echo "Warn: $c unowned files on system."
		cat "$tmp"
	else
		echo "Warn: Lots of unowned files on system:"
		cat "$tmp"
		echo "..."
	fi
else
	echo "OK"
	echo "OK: No unowned files on system."
fi > "$STATUS"