#!/bin/bash
# $Id: check_e2fs_next_fsck,v 1.10 2011/08/16 12:14:13 cvsoernii Exp $
# Author: Ernest Beinrohr, AXON PRO, 2010, Ernest.Beinrohr@axonpro.sk
# Licence: GPL 3
#  Patches: Giles.Westwood@semantico.com

PATH=$PATH:/sbin
DEVS=`egrep "ext2|ext3|ext4" /etc/mtab|cut -f 1 -d " " | tr '\n' ' '`
WARNINGS=""
ERRORS=""
HOST=`hostname`
WARN_DAYS=7
MAX_INODE_COUNT=50000 # devices with less than this inodes are not checked

for DEV in $DEVS
do
    COUNT=`dumpe2fs -h $DEV 2>&1| grep '^Mount count'|cut -f2 -d:`
    MAX_COUNT=`dumpe2fs -h $DEV 2>&1| grep '^Maximum mount count'|cut -f2 -d:`
    NEXT_STRING=`dumpe2fs -h $DEV 2>&1| grep '^Next check after'|cut -f2- -d:`
    INODE_COUNT=`dumpe2fs -h $DEV 2>&1| grep '^Inode count'|cut -f2 -d:`
    NEXT=`date --utc --date "$NEXT_STRING" +%s`
    NOW=`date --utc +%s`

    # control count, control time
    let COUNT2=COUNT+1
    let NEXT2=NEXT-`echo $WARN_DAYS*24*3600|bc`

    # count check
    if [[ $COUNT -ge $MAX_COUNT && $MAX_COUNT -ne -1 && $INODE_COUNT -ge $MAX_INODE_COUNT ]]
    then
        ERRORS="$ERRORS $DEV mountCount=$MAX_COUNT, next restart causes FSCK !!   "
    fi
    if [[ $COUNT2 -ge $MAX_COUNT && $MAX_COUNT -ne -1 ]]
    then
        WARNINGS="$WARNINGS $DEV mountCount is $COUNT of Max:$MAX_COUNT. Run fsck while you can !!   "
    fi

    # time check
    if [[ $NOW -ge $NEXT && $NEXT_STRING != "" && $INODE_COUNT -ge $MAX_INODE_COUNT ]]
    then
        ERRORS="$ERRORS $DEV next fsck check time is in the past ($NEXT_STRING), next restart causes FSCK !!   "
    fi
    if [[ $NOW -ge $NEXT2 && $NEXT_STRING != "" ]]
    then
        WARNINGS="$WARNINGS $DEV next fsck check is in $NEXT_STRING. Run fsck while you can !!   "
    fi
done

if [[ $ERRORS != "" ]]
then
    echo "ERROR: $HOST: $ERRORS"
    exit 2
elif [[ $WARNINGS != "" ]]
then
    echo "WARNING: $HOST: $WARNINGS"
    exit 1
else
    echo "OK, filesystems $DEVS are fsck safe"
fi