iankelling.org Git - distro-setup/blob - filesystem/etc/apt/detect-http-proxy

   1 #!/bin/bash
   2 # based on
   3 # http://askubuntu.com/questions/53443/how-do-i-ignore-a-proxy-if-not-available
   4 # altered because testing a down proxy takes like 2 seconds,
   5 # and we would do it like 100 times in a row. so cache a failed result
   6 # locally for 10 minutes. Also, using newer option based on man apt.conf.
   7 #
   8 # Once when I was testing, it seemed I needed to have it output
   9 # DIRECT after outputing the proxy url
  10
  11 # note, the url we are trying to fetch is $1
  12
  13 # note, if there is a problem, some ways to debug:
  14 # first,
  15 # edit /etc/apt/apt.conf.d/02proxy
  16 # add, remove the autodetec
  17 # Acquire::http::proxy "http://CacheServerIp:3142";
  18 # see the /var/log/apt-cacher-ng logs
  19 # read
  20 # file:///usr/share/doc/apt-cacher-ng/html/index.html
  21
  22 proxy_host=faiserver
  23 proxy_port=3142
  24 proxy_url=http://$proxy_host:$proxy_port/
  25 f=/tmp/apt_proxy_fail
  26 if [[ ! -w /tmp ]]; then
  27     echo DIRECT
  28     exit 0
  29 fi
  30 modtime=$(stat -c %Y $f 2>/dev/null ) ||:
  31 if [[ $modtime ]] && (( $(( EPOCHSECONDS - modtime  )) < 60*10 )); then
  32     echo DIRECT
  33     exit 0
  34 else
  35     rm -f $f
  36 fi
  37 if getent hosts $proxy_host &>/dev/null && timeout 1 nc -z $proxy_host $proxy_port &>/dev/null; then
  38     echo $proxy_url
  39 else
  40     if [[ ! -e $f || -w $f ]]; then
  41         touch $f
  42     fi
  43 fi