#!/bin/sh
#
#	$Id: unsnap.sh,v 1.5 2008/12/12 13:35:58 cvs Exp $
#
case "$1" in
*.old)
	old="${1%/.old}"
	old="${old%/}"
	old="${old%/backups}"
	old="${old%/}"
	user=`mount -t ufs | grep "^/dev/md.*${old}/backups/saved,.*read-only" |
	sort --key=3 | head -1 |
	while read dev on mbase mode
	do
		echo "${mbase}"
	done`
	;;
*)
	if test ! -d "${1}"
	then
		echo "Usage: ${0##*/} /path/backup/saved,<date>" >&2
		echo "Usage: ${0##*/} /path/.old" >&2
		exit 64
	fi
	user="${1}"
	;;
esac
#
# last name of path
date="${user##*/}"
#
# first name of path
base="${user%/backups/*}"
#
if test ! -d "${base}/backups/${date}"
then
	echo "snapshot ${base}/backups/${date}: dir does not exist" >&2
	exit 65
fi
#
# get the device in use
nr=`mount -t ufs | grep "^/dev/md.*${base}/backups/${date}.*read-only" |
while read dev on mbase mode
do
	echo "${dev#/dev/md}"
done`
#
if test "${nr}" -le 0 -o "${nr}" -ge 40
then
	echo "snapshot ${base}/backups/${date}: is not a snapshot" >&2
	exit 65
fi
#
# umont the backup device
umount "${base}/backups/${date}"
#
# remove directory
rmdir "${base}/backups/${date}"
#
# detach device
mdconfig -d -u "${nr}" 2>> /dev/null
#
# destroy snapshort data
rm -f "${base}/.snap/${date}"
#
# eof