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Forked from f99aq8ove/zfs_snapshot.sh
Created September 13, 2010 00:04
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#!/bin/sh
#
# zfs snapshot auto-rotation
#
# usage: zfs_snapshot.sh <mountpoint> <snapshot name> <number of keeping snapshots> [recursive]
#
# recursive option: Recursively create snapshot (zfs snapshot -r)
#
# for crontab
#
# @daily /root/bin/zfs_snapshot.sh tank days_later 7 recursive
# @weekly /root/bin/zfs_snapshot.sh tank weeks_later 5 recursive
# @monthly /root/bin/zfs_snapshot.sh tank months_later 12 recursive
# @yearly /root/bin/zfs_snapshot.sh tank years_later 10 recursive
PATH=/sbin:$PATH
mountpoint=$1
snapshot_name=$2
level=$3
option=$4
# Basic argument checks:
if [ -z $level ] ; then
usage
fi
if [ ! -z $5 ] ; then
usage
fi
zfs_opt=
if [ "$option" = "recursive" ]; then
zfs_opt=-r
fi
## destroy outdated snapshot
zfs destroy $zfs_opt "$mountpoint@`expr $level - 1`$snapshot_name"
## rolling snapshot
j=`expr $level - 2`
for i in `jot - $j 0`; do
i_plus1=`expr $i + 1`
zfs rename $zfs_opt "$mountpoint@$i$snapshot_name" "$mountpoint@$i_plus1$snapshot_name"
done
## take snapshot
zfs snapshot $zfs_opt "$mountpoint@0$snapshot_name"
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