backup.bash

SCRIPT_LOCATION=$(dirname $0)

#get common configuration
if [ -f ${SCRIPT_LOCATION}/hosts/common/conf ]; then
    . ${SCRIPT_LOCATION}/hosts/common/conf
fi

#set per-host configuration
if [ -f ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/conf ]; then
    . ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/conf
fi

#run pre-backup hooks
if [ -d ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/pre-backup ]; then
    for hook in ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/pre-backup/* ; do
        test -f "$hook" && \
          . $hook
    done
fi

env
echo "Backup start date is $(date)"

#Rotate backups
echo "Rotating backups, backups currently kept: $NUMBACKUP."
echo "Backup is to $BCKIP using account $BCKUSER"
rmcmd="rm -rf $BCKHOSTDIR/$(hostname --fqdn)/$NUMBACKUP"
ssh $BCKUSER@$BCKIP "$rmcmd"
for i in $(seq $NUMBACKUP -1 1); do
    mvcmd="mv $BCKHOSTDIR/$(hostname --fqdn)/$(echo $i - 1 |bc |tr -d '\n') $BCKHOSTDIR/$(hostname --fqdn)/$i"
    ssh "${BCKUSER}@${BCKIP}" "$mvcmd"
done
ssh "${BCKUSER}@${BCKIP}" "cp -al $BCKHOSTDIR/$(hostname --fqdn)/1 $BCKHOSTDIR/$(hostname --fqdn)/0"

#Rotate log backups (be careful to escape non-local variables)

REMOTECMD="
cd $BCKHOSTDIR/logs/$(hostname --fqdn)
last=\$(ls | sort -n|tail -1)
for i in \$(seq \$last -1 0); do
    mv \$i \$(echo \$i + 1 |bc |tr -d '\n')
done
cp -al 1 0
echo We have \$last log backups
"
echo "ssh ${BCKUSER}@${BCKIP}"
echo "$REMOTECMD" |sed 's,^,    ,g'
echo "$REMOTECMD" |ssh "${BCKUSER}@${BCKIP}"

#disable filename globbing for /foo/** etc..
set -f

#build up the list of files/directories to exclude
if [ -z $EXCLUDECMD ]; then
    EXCLUDECMD=""
fi
for dir in $EXCLUDEDIRS; do
  EXCLUDECMD="${EXCLUDECMD} --exclude $dir/**"
done

#make modification date reflect the date of the backup
ssh $BCKUSER@$BCKIP "touch $BCKHOSTDIR/$(hostname --fqdn)/0 $BCKHOSTDIR/logs/$(hostname --fqdn)/0"

#backup to last snapshot (main)
RSYNCMD="rsync $EXTRAARGS $EXCLUDECMD / $BCKDST/$(hostname --fqdn)/0"
echo $RSYNCMD
ionice -c $ionicelevel nice -n $nicelevel $RSYNCMD

#backup to last snapshot (logs)
RSYNCMD="rsync $EXTRAARGS /var/log $BCKDST/logs/$(hostname --fqdn)/0"
echo $RSYNCMD
ionice -c $ionicelevel nice -n $nicelevel $RSYNCMD

#re-enable filename globbing
set +f

#run post-backup hooks
if [ -d ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/post-backup ]; then
    for hook in ${SCRIPT_LOCATION}/hosts/$(hostname --fqdn)/post-backup/* ; do
        test -f "$hook"  && \
          . $hook
    done
fi

echo "Backup end date is $(date)"

conf

nicelevel=9
ionicelevel=3

NUMBACKUP=5

BCKIP="ip/host.of.backup.machine"
BCKUSER="backup"
BCKDST="rsync://$BCKIP/virtual/path/on/rsync/srv"
BCKHOSTDIR="/full/path/of/backup/dir"

EXCLUDEDIRS="/tmp /proc /dev /sys /root/.cache /var/cache/duplicity /var/cache/apt/archives/"

EXTRAARGS="-za --partial --delete"
FAKESUPER=--rsync-path="rsync --fake-super"
EXTRAARGS="$EXTRAARGS $FAKESUPER"