ZFS Recursive Rollback

zfs-rollback.sh

#!/bin/sh
# Originally by: Dr. Martin Menzel www.dr-menzel-it.de
# Modified by Matthew Pherigo
#
# Use at your own risk. No warranty. No fee.
#
# parameter list:
#   (1) the filesystem to be used to start decendant recursion
#       example: apool/zones/webzone
#   (2) the snapshot to which the filesystems should be rolled back
#       example: @2013-07-21-083500
usage ()
{
	echo "Usage: $0 zpool/root@snapshot"
}
if [ $# == 2 ]; then
	POOL=$1; SNAP=$2; COUNT=`zfs list -H -t snapshot -r $POOL |\
	       						grep -c "$SNAP"`
	[ $COUNT > 0 ] || return 1
elif [ $# == 1 ]; then
	echo "$1"
	POOL=`echo "$1" | grep -Eo '[a-zA-Z0-9/]*'` # <- Grep too po' to
	SNAP=`echo "$1" | grep -Eo '@(.*)'`	    # afford lookaround

	COUNT=`zfs list -H -t snapshot -r $POOL | grep -c "$SNAP"`
	[ $COUNT > 0 ] || return 1
else
	echo "Usage: $0 zpool/root@snapshot"
fi

echo "$POOL - $SNAP"
for eachsnap in `zfs list -H -t snapshot -r $POOL | grep "$SNAP" | cut -f 1`; do
        # -r : also destroys the snapshots newer than the specified one
        # -R : also destroys the snapshots newer than the one specified
	#      and their clones
        # -f : forces an unmount of any clone file systems that are to be
	#      destroyed
        echo -n "rolling back to [$eachsnap] : "; zfs rollback -r -R -f $eachsnap
	echo "  Done."
done

Working script here: https://gist.github.com/Boruch-Baum/13f15781eafbd8c2098eca081f3b09be