#!/bin/sh
if [ "$ramroot" = "" ]; then
    echo "Use only with ramroot-admin"
    exit 1
fi

prev="$1"
new="$2"
desc="$3"

if [ ! -d "$ramroot/snapshot/$prev" ]; then
    echo "Old snapshot $prev does not exist"
    exit 1
fi

if [ -d "$ramroot/snapshot/$new" ]; then
    echo "New snapshot already exists"
    exit 1
fi

echo "#${new} `date +"%Y-%m-%d %H:%M"` ${desc}" > /etc/ramroot/grub-title

mount -o remount,rw $ramroot
rsync --numeric-ids -ax --delete --link-dest=../${prev} --exclude $ramroot / $ramroot/snapshot/${new}
mount -o remount,ro $ramroot