Improve pre error handling

ROOT/usr/lib/chem-zfs-backup-server/zfs-rsync.sh

@@ -13,6 +13,9 @@ TAG=${SRC//\//.}
 LOGDIR=/var/log/chem-zfs-backup-server/
 CONFDIR=/etc/chem-zfs-backup-server/zfs-rsync.d
 
+TIME=`date +%s`
+LOGFILE=$LOGDIR${HN}_${TAG}.log
+
 if [ -z "$DST" ] ; then
  echo Use: $0 hostname destination
  exit 1
@@ -32,8 +35,6 @@ if [ ! -z "$PRE" ] ; then
 fi
 
 # Do the backup
-TIME=`date +%s`
-LOGFILE=$LOGDIR${HN}_${TAG}.log
 echo Making snapshot with zfs snapshot $DST@$TIME 2>&1 >>$LOGFILE
 zfs snapshot $DST@$TIME
 #DEST=`mount | awk ' $1=="'$DST'" { print $3 } '`