#!/bin/bash
# based on
# http://askubuntu.com/questions/53443/how-do-i-ignore-a-proxy-if-not-available
# altered because testing a down proxy takes like 2 seconds,
# and we would do it like 100 times in a row. so cache a failed result
# locally for 1 hour. Also, using newer option based on man apt.conf.
proxy_host=faiserver
proxy_port=3142
proxy_url=http://$proxy_host:$proxy_port
f=/tmp/apt_proxy_fail
if [[ ! -r $f ]] \
       || (( $(( $(date +%s) - $(stat -c %Y $f ) )) > 60*60 )); then
    if host $proxy_host && nc -z $proxy_host $proxy_port; then
        echo $proxy_url
    else
        touch $f
    fi
fi
echo DIRECT