#!/bin/bash
#
# homedirbackup.sh - script responsible for performing home directory back ups
# to a location that is NOT the fileserver.
#
# 20101014 - directory typo on destination fixed (mth)
# 20101013 - initial version (mth)
#
ismaster="`df | grep export | wc -l`"
if [ "$ismaster" -eq 1 ]; then

    alphabet="abcdefghijklmnopqrstuvwxyz"
    date=`date +"%Y%m%d"`
    day=`date +"%d"`
    if [ "$day" -lt 14 ]; then
        bhost="sokraits"
    else
        bhost="halfadder"
        let day=$day-13
    fi

    range="`echo $alphabet | cut -c $day,$(($day+13))`"
    cd /export/home
    for user in `/bin/ls -1d [$range]*`; do
        #echo -n "[$user] "

        # Check the load average, and delay as long as we're above 200% CPU
        loadavg=`uptime | sed 's/^.*average: \([0-9][0-9]*\)\.\([0-9][0-9]\).*$/\1/'`
        while [ "$loadavg" -ge 2 ]; do
            sleep "$((RANDOM % 64 + 64))"
            loadavg=`uptime | sed 's/^.*average: \([0-9][0-9]*\)\.\([0-9][0-9]\).*$/\1/'`
        done

        ssh $bhost "mkdir -p /backup/${user}; /backup/prune.sh ${user}"
        tar cpf - $user | gzip -9 | ssh $bhost "dd of=/backup/${user}/${user}-${date}.tar.gz"
    done
fi
exit 0