#!/bin/bash

# Author: Alan Pippin
# Description: This script will remove all snaps containing a given snapshot pattern
#              across all filesystems on a given pool.
# Usage: zfs-rm-all-snaps <pool> <snapshot pattern>

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

# command line arg parsing
zfs_pool=$1
snap_pattern=$2

if [[ -z "$zfs_pool" ]] || [[ -z "$snap_pattern" ]]; then
  echo "Usage: $0 <pool> <snapshot pattern>"
  exit 1
fi

echo "-> Deleting all snapshots on pool '$zfs_pool' with pattern '$snap_pattern'"
for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
  echo "   removing snapshot: $snap"
done

echo -e "\n<Press Enter to execute removal, CTL-C to abort>";
read

for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
  echo "   destroying snapshot: $snap"
  zfs destroy "$snap" 2>/dev/null
done

echo "-> Snapshots removed"