#!/bin/bash

# Author: Alan J. Pippin
# Description: This script is a wrapper script that calls zfs-autosnap
#              for each filesystem provided below.

# source our configuration
config="${0%/*}/zfs-scripts.conf"
[ -e "${config}.dist" ] && . ${config}.dist
[ -e "${config}" ] && . ${config}

# Setup some default values
logfile="$logdir/zfs-autosnap.log"
numsnapshots=20
maxagedays=365
date=`date`
mylockdir="/tmp/zfs-autosnap-all"
current_hour=`date +"%H"`
current_minute=`date +"%M"`
current_day=`date +"%u"`

# Make sure we aren't already running
if ! mkdir "$mylockdir" >/dev/null 2>&1; then
  echo "$date Another $0 process is already running" >> $logfile
  exit 1
fi

# Auto snapshot every zfs filesystem on the system specified below
date >> $logfile

# Special filesystems
# ex: zfs-autosnap storage /storage $numsnapshots 15
# ex: zfs-autosnap tank/usr/videos /usr/videos $numsnapshots 15

# Normal filesystems
# ex: zfs-autosnap tank / $numsnapshots $maxagedays 
# ex: zfs-autosnap tank/home /home $numsnapshots $maxagedays

# Daily filesystems (only perform these at midnight)
# midnight = true if (midnight < current time < midnight+5 min)
if [[ $current_hour == "00" && $current_minute -lt 5 ]]; then
   echo "Performing Daily snapshots" >> $logfile
fi

# Weekly filesystems (only perform these on Sunday at midnight)
# midnight = true if (midnight < current time < midnight+5 min)
if [[ $current_day == "7" && $current_hour == "00" && $current_minute -lt 5 ]]; then
  echo "Performing Weekly snapshots" >> $logfile
fi

rm -rf "$mylockdir"