#!/bin/bash
reason=$1
target=$2
[ -z "$target" ] && target="src"
[ -z "$reason" ] && reason="any"
hash=`find "$target" -type f -print0 | sort -z | xargs -0 md5sum | md5sum | cut -d " " -f 1` 
mkdir -p temp

[ -f "temp/_last_hash.$reason" ] && [ "`cat temp/_last_hash.$reason`" = "$hash" ] && exit 0

echo $hash > temp/_last_hash.$reason
exit 1