#!/bin/bash

# name of the volume
zname=$(dirname $(dirname $(echo $2 | cut -b 2-)))

# name of the future snapshot
bsname="$zname@rsnap-$(date +%F)"

sname=$bsname
for i in 1 2 3 4 5
do
  # exit if success
  zfs snapshot "$sname"
  if [ "x$?" == "x0" ]; then
    echo "backup started at $(date)" > $2/info
    exit 0
  fi
  # iterate over it if already exists
  sname=$bsname-v$i
done

echo ERROR zfs_cp: something is really broken
exit 1