#!/bin/bash
# softraid.monitor
# Linux Software RAID check with mon compatible output/return values
# Call without arguments.
# The reference file $md_ref must exist. To generate it:
#   softraid.monitor learn
#   [ cat /proc/mdstat > /path/to/dir/mdstat.reference ]
# no administrative permissions needed for this script.
# Return values: 3 /proc/mdstat missing, no Software RAID?
#                2 reference file missing
#                1 RAID not okay
#                0 alles okay
#
# Date: Thu, 07 Apr 2005 17:28:02 +0200
# From: Kevin Ivory <Ivory@SerNet.de>
# To: mon@linux.kernel.org
# Subject: Re: Monitoring software raid?
#

mdstat="/proc/mdstat"
# THIS NEEDS TO BE SOMEWHERE THE CHECKING USER CAN WRITE
md_ref="/var/something/mdstat.reference"
if [ ! -r "$mdstat" ]; then
  echo -e "$HOSTNAME:$0
        Missing RAID status file: $mdstat
        Perhaps no software RAID?"
  exit 3
fi
if [ "$1" = "learn" ]; then
  cat "$mdstat" > "$md_ref"
fi
if [ ! -r "$md_ref" ]; then
  echo -e "$HOSTNAME:$0
        Missing RAID reference file: $md_ref
        Generate with: $0 learn > $md_ref"
  exit 2
fi
md_out="Complete contents of $mdstat:\n\n$(cat $mdstat)"
diff=$(diff -u -U 0 $md_ref $mdstat)
stat=$?
if [ $stat -eq 0 ]; then
  echo -e "$HOSTNAME\nSoftware RAID ok:\n$md_out"
else
  echo -e "$HOSTNAME\nSoftware RAID not ok:\n$diff\n\n$md_out"
  exit 1
fi
# end of softraid.monitor
