can't load module sbp2 when running script from cron

[Andreas Berglund <andreas.berglund@home.se>]

Hi!
I use a wrapper-script around rsnapshot to handle my backups, which I
have attached. When run from the terminal it works great, but when run
from cron it chokes because it can't load module sbp2. The error code I
get from modprobe is 127 if that means anything to anyone.

Does anyone have any idea why it would work from the terminal but not
from cron?

regards
Andreas Berglund




#!/bin/sh

# Wrapper script around rsnapshot to deal with the fact that the backup-media
# is removable 

backup_location=/media/backup
# load firewire harddrive module
err_msg=$(modprobe sbp2)
ret=$?

if [ "$ret" -ne 0 ]
then
	logger -s -t backup-script "user = `whoami`, \$ret = $ret"
	logger -t backup-script -p cron.err "Failed backup at $(date): Couldn't load sbp2 module"
	logger -t backup-script -p cron.err "Failed backup at $(date): $err_msg"
	exit 1
fi

# allow time for udev to create device file before we try to mount
sleep 2

# See if $backup_location is mounted
grep $backup_location /etc/mtab > /dev/null

# if return value of grep is not 0 then $backup_location is not mounted 
if [ $? -ne 0 ]
then
	err_msg=$(mount $backup_location)
fi

# Mount failed
if [ $? -ne 0 ]
then
	logger -t backup-script -p cron.err "Failed backup at $(date): Mount failed"
	logger -t backup-script -p cron.err "Failed backup at $(date): $err_msg"
	exit 2
fi


if [ -e $backup_location/backup.lock ]
then
	rsnapshot weekly
else
	logger -t backup-script -p cron.err "Failed backup at $(date): Lockfile missing, probably wrong media" 
fi

logger -t backup-script -p cron.err "Succesful backup at $(date)" 
umount $backup_location
rmmod sbp2