#!/bin/bash

set -e
set -x

id="$1"
src="$2"
dest="$3"

base="$( cd "$(dirname "$0")" ; pwd -P )"

if [ -z "$dest" ]; then
	echo >&2 "usage: $0 id src dest"
	exit 1
fi

last=$(ipfs files cat "/last$id" || echo "X")

while true; do
    $base/wait_for_ipns_change "$src" "$last" 10 && {
        last=$($base/sync_ipns "$src" "$dest")
        echo "$last" | ipfs files write "/last$id"
    } || {
        :
    }
    sleep 1
done