#!/bin/bash
# Script to check whether a filesystem has been remounted read-only due to
# an error.  Set up a cron job to run this script as often as you'd
# like to check the filesystem status. Requires sendmail (or equivalent) on
# the local machine. Contributed by Stian Barmen.

# Write the name of the device to be checked
dev=/dev/mapper/encryptraid
tmp=/root/scripts/raidcheck

a=`mount | grep $dev | cut -d " " -f 3`

if [ "$a" ]

then 
		# This surpresses error missing file on first run!
		`touch $tmp/.rwcheckmail`

		# If date has not changed since last mail sendt don't
		# send a new mail. This ensures max 1 mail pr. day!
	 	if [ "`date -I`" != "`cat $tmp/.rwcheckmail`" ]
		then

			# If echo 1 to the file system is successful, delete
			# the .rwtest file. Otherwise send mail to root,
			# adding the date of the sent mail if successful to
			# .rwcheckmail file (if mail sending fails this does
			# not happen!).
			`echo 1 > $a/.rwtest && rm $a/.rwtest || ( \
	 		echo -e "Subject: RW Check - File system $dev is read only\n\n"\
				"RW test on $dev detected that the filesystem is read only,\n"\
				"consider checking the status of the mounted file system." \
			|sendmail root && date -I > $tmp/.rwcheckmail )`
		fi

else
		# This surpresses error missing file on first run!
		`touch $tmp/.rwcheckmail`
		
		# If date has not changed since last mail sendt don't
		# send a new mail. This ensures max 1 mail pr. day!
	 	if [ "`date -I`" != "`cat $tmp/.rwcheckmail`" ]
		then
			# Send mail to root, adding the date of the sent mail
			# if successful to .rwcheckmail file (if mail sending
			# fails this does not happen!).
	 		`echo -e "Subject: RW Check - File system $dev if not mounted\n\n"\
				 "Mount test on $dev detected that the filesystem is not mounted,\n"\
				 "consider checking the status of the mount or drives." \
			| sendmail root && date -I > $tmp/.rwcheckmail`
		fi
fi