Over the last year or so, I've be trying to learn bash scripting on Ubuntu (one 20.04 LTS box and one 21.04). I feel that my skills have been progressing nicely, but I'm at my wits end with one particular backup script I've written.
Long story short, if the backup script is only trying to backup my /home directory, it runs smoothly beginning to end, but if it is trying to backup my / directory, it runs until the rsync process is complete (including creating a log file), and then the script simply seems to stop, event though I've got some housekeeping code that follows to alert me. I even added an exit trap, but that isn't triggered.
I don't know what I'm missing, but I'm eager to try to learn, if anyone can help me out.
I don't know if it will help, but here's a slightly simplified version of my script:
#!/bin/bash
#
# backup
# unified back up, home and/or root folders to raid on Betty
# runs daily from sudo crontab (time varies by device); day of month determines which backup is performed
#
# related files
# generates backup.log in home folder of main user, archives existing backup.log to logs folder as yyyy-mm-dd-backup.log
# requires two files in $homefold: home-backup.exclude and boot-backup.exclude, to provide backup exclusions for rsync
#
# exit trap
function badquit {
if [[ "$1" = "test" ]] ; then
exit 0
elif [[ "$goodflag" = "0" ]] ; then
echo "$(date +%r) : $shname exited with goodflag=0" > $logfold/$shname.quit
fi
}
trap badquit EXIT
#
# variables
host="$(hostname)"
hostlc="${host,,}"
shname="$(basename $0)"
hostuser="$(getent passwd "1000" | cut -d: -f1)"
homefold="/home/$hostuser"
logfold="$homefold/logs"
log="$homefold/$shname.log"
date="$(date +%Y-%m-%d)"
dom="$(date +%d)" # day of month at runtime determines which backup is performed (daily home, weekly home, quarterly boot)
soonwarn="7" # days in advance to create .soon report
case $host in # $bumount location varies by device: Betty mounts it differently than all others
Betty)
bumount="/mnt/raid"
;;
*)
bumount="/media/betty-raid"
;;
esac
bufold="$bumount/$hostlc"
goodflag="0" # default status of goodflag to trigger unexpected exit message
#
# pre-check
# confirm existence of $bufold, attempt to mount if not found, set fail message if unsuccessful
if [[ ! -e $bufold ]] ; then
mount 192.168.x.x:/mnt/raid $bumount
sleep 5
if [[ ! -e $bufold ]] ; then
echo "$(date +%r) : $shname exited because $bufold could not be mounted" > $logfold/$shname.quit
goodflag="1"
exit 1
fi
fi
#
# log management
if [[ -e $log ]] ; then
mv $log $logfold/"$(date -r $log +"%Y-%m-%d")"-$shname.log
fi
#
# primary tasks
# set targdom per old boot backup schedule (to allow time for .soon)
case $host in
Betty)
targdom="8"
;;
Veronica)
targdom="12"
;;
*)
echo "$(date +%r) : $shname cannot identify $host" > $logfold/$shname.quit
goodflag="1"
exit 1
;;
esac
# determine which backup to run, set final variables
if [[ "$dom" = "$targdom" ]] ; then # targdom triggers non-daily backups
if [[ $(date +%m) -eq "01" ]] || [[ $(date +%m) -eq "04" ]] || [[ $(date +%m) -eq "07" ]] || [[ $(date +%m) -eq "10" ]] ; then # quarterly boot backup Jan,Apr,Jul,Oct
ropts="-avuHkbi --delete --exclude-from=$homefold/boot-backup.exclude --backup-dir=$bufold/Backup.$date --log-file=$log"
rsource="/"
else # monthly home backup
ropts="-axvuHkbi --delete --exclude-from=$homefold/home-backup.exclude --backup-dir=$bufold/Backup.$date --log-file=$log"
rsource="/home"
fi
else # not targdom, daily home backup
ropts="-axvuHkbi --exclude-from=$homefold/home-backup.exclude --backup-dir=$bufold/Backup.$date --log-file=$log" #daily home backup
rsource="/home"
fi
# if this is a test, set variables appropriately
if [[ "$1" = "test" ]] ; then
ropts="-navuHkbi --exclude-from=$homefold/boot-backup.exclude --backup-dir=$bufold/Backup.$date --log-file=$log" # dry-run ON
rsource="/"
fi
# run the backup, finally
rsync $ropts --backup-dir=$bufold/Backup.$date --log-file=$log $rsource $bufold
#
# set exitcond
if [[ "$?" = "0" ]] ; then
# successful, log saved
exitcond="successfully, log saved"
else
# unsuccessful, exit cond
exitcond="unsuccessfully, exit code $?"
fi
#
echo "$(date +%r) : $shname completed $exitcond" >> $logfold/$shname.done
goodflag="1"
