#!/bin/bash

# We want to catch any command failure, and exit immediately
set -e

# Download helper for wget
# Call it with:
#   $1: URL
#   $2: output file
# And this environment:
#   WGET      : the wget command to call

url="${1}"
output="${2}"

if ${WGET} -O "${output}.tmp" "${url}"; then
    mv "${output}.tmp" "${output}"
else
    rm -f "${output}.tmp"
    exit 1
fi