#!/bin/sh

NAME="cciss-vol-statusd"
STATUSFILE=/var/run/$NAME.status

# Do not touch you can configure this in /etc/default/cciss-vol-statusd
MAILTO=root   # Where to report problems
PERIOD=600    # Seconds between each check    (default 10 minutes)
REMIND=7200   # Seconds between each reminder (default 2 hours)
ID=/dev/cciss/c0d0

[ -e /etc/default/cciss-vol-statusd ] && . /etc/default/cciss-vol-statusd

# Gracefully exit if the package has been removed.
test -x /usr/bin/cciss_vol_status || exit 0

while true ; do
    # Check ever $PERIOD seconds, send email on every status
    # change and repeat ever $REMIND seconds if the raid is still
    # bad.
    if (cciss_vol_status $ID); then
        BADRAID=false
    else
        BADRAID=true
        logger -t cciss-vol-statusd "detected non-optimal RAID status"
    fi
    STATUSCHANGE=false
    if [ true = "$BADRAID" ] ; then
        # RAID not OK
        (cciss_vol_status $ID) > $STATUSFILE.new
        if [ ! -f $STATUSFILE ] ; then # RAID just became broken
            STATUSCHANGE=true
            mv $STATUSFILE.new $STATUSFILE
        elif cmp -s $STATUSFILE $STATUSFILE.new ; then
            # No change.  Should we send reminder?
            LASTTIME="`stat -c '%Z' $STATUSFILE`"
            NOW="`date +%s`"
            SINCELAST="`expr $NOW - $LASTTIME`"
            if [ $REMIND -le "$SINCELAST" ]; then
                # Time to send reminder
                STATUSCHANGE=true
                mv $STATUSFILE.new $STATUSFILE
            else
                rm $STATUSFILE.new
            fi
        else
            STATUSCHANGE=true
            mv $STATUSFILE.new $STATUSFILE
        fi
    else
        # RAID OK
        if [ -f $STATUSFILE ] ; then
            rm $STATUSFILE
            STATUSCHANGE=true
        fi
    fi

    if [ true = "$STATUSCHANGE" ]; then
        hostname="`uname -n`"
        (
            cat <<EOF
This is a RAID status update from cciss-vol-statusd.  The cciss_vol_status
program reports that one of the RAIDs changed state:

EOF
            if [ -f $STATUSFILE ] ; then
                cat $STATUSFILE
            else
                (cciss_vol_status $ID)
            fi
            echo
            echo "Report from $0 on $hostname"
        ) | mail -s "info: CCISS raid status change on $hostname" $MAILTO
    fi

    sleep $PERIOD
done