read the comment ^^

isnapshot.sh

#!/bin/bash

# A generator for a nicely tweaked rsnapshot configuration
#  it collects in and exclude from rsnapshot files in the VZ and the Host roots.
#  such files could look like following:

# > cat /rsnapshot
#   /
#   !/var/log
#   !/tmp

# this would include everything, except /var/log and /tmp.. What a GREAT and SIMPLE
# syntax.. No more fiddling in rsnapshot.conf

# remember, this is a first test, not a final and bugfree version.. (:

# after running this run "rsnapshot -c /etc/rsnapshot.tmp.conf BlaaaFooo"


TMP_CONF="/etc/rsnapshot.tmp.conf"

BACKUP_ROOT="/backup"

RSNAPSHOT_CONF="/rsnapshot"
RSNAPSHOT_VZ_CONF="/rsnapshot"

VZ_ROOT="/var/lib/vz/private"
TMP_VZ_ROOT="/container"

HOSTNAME=$(hostname -f)


cat > $TMP_CONF << -EOF
config_version	1.2
snapshot_root	$BACKUP_ROOT/
cmd_cp		/bin/cp
cmd_rm		/bin/rm
cmd_rsync	/usr/bin/rsync
cmd_logger	/usr/bin/logger
cmd_du		/usr/bin/du
#cmd_preexec	/path/to/preexec/script
#cmd_postexec	/path/to/postexec/script
interval	hourly	6
interval	daily	7
interval	weekly	4
interval	monthly	1
verbose		3
loglevel	3
logfile		/var/log/rsnapshot.log
lockfile	/var/lock/rsnapshot.pid
-EOF

if [ ! -L $TMP_VZ_ROOT ]; then
	sudo ln -s $VZ_ROOT $TMP_VZ_ROOT
fi

for i in $(cat $RSNAPSHOT_CONF|egrep "^!.*"|sed "s/^!\(.*\)/\1/"; echo $VZ_ROOT;echo $TMP_VZ_ROOT)
do
	printf "exclude\t$i\n" >> $TMP_CONF
done

for i in $(cat $RSNAPSHOT_CONF|egrep -v "^!.*"; echo $RSNAPSHOT_CONF)
do
	printf "backup\t$i\t$HOSTNAME/system/\n" >> $TMP_CONF
done

for vz in $(ls $TMP_VZ_ROOT)
do
        conf=$TMP_VZ_ROOT/$vz$RSNAPSHOT_VZ_CONF
        if [ -f $conf ]; then 
                echo "# backup-directives for vz: $vz" >> $TMP_CONF
                for include in $(cat $conf|egrep -v "^!"; echo "$RSNAPSHOT_VZ_CONF")
                do
                        include=$TMP_VZ_ROOT/$vz$include
                        printf "backup\t$include\t$HOSTNAME/\n" >> $TMP_CONF
                done
                for exclude in $(cat $conf|egrep "^!"| sed 's/^!\(.*\)/\1/i')
                do
                        exclude="$TMP_VZ_ROOT/$vz$exclude"
                        printf "exclude\t$exclude\n" >> $TMP_CONF
                done
        fi
done