security-misc/usr/lib/security-misc/apt-get-update

#!/bin/bash

## This file is part of Whonix.
## Copyright (C) 2012 - 2014 Patrick Schleizer <adrelanos@riseup.net>
## See the file COPYING for copying conditions.

sigterm_trap() {
   if [ "$lastpid" = "" ]; then
      exit 143
   fi
   ps -p "$lastpid"
   if [ ! "$?" = "0" ]; then
      ## Already terminated.
      exit 143
   fi
   kill -sigterm "$lastpid"
   exit 143
}

trap "sigterm_trap" SIGTERM

timeout_after="120"
kill_after="10"

timeout \
   --kill-after="$kill_after" \
   "$timeout_after" \
   /usr/lib/security-misc/apt-get-wrapper update &

lastpid="$!"
wait "$lastpid"

exit "$?"