auto-apt-proxy - autodetect common APT proxy setups

       By default, auto-apt-proxy will cache its results for 60 seconds.

       To disable the cache, set the AUTO_APT_PROXY_NO_CACHE environment variable to any non-empty string.

       When your apt proxy is installed on localhost or your default gateway,  it  should  Just  Work.   If  you
       install it somewhere else, you can create an explicit SRV record to tell auto-apt-proxy about it.

       Suppose    your    corporate    domain    is   “example.com”,   and   apt-cacher-ng   is   installed   on
       “apt-cacher-ng.example.com”, and auto-apt-proxy is installed on “alices-laptop.example.com”.

       The appropriate SRV record in dnsmasq.conf would look like this:

              srv-host=_apt_proxy._tcp.example.com,apt-cacher-ng.example.com,3142

       The appropriate nsd/bind zonefile entry would look like this (untested):

              _apt_proxy._tcp.@  IN SRV 0 0 3142 apt-cacher-ng.@

       As an alternative to an SRV record, one can also define a special hostname which needs to be resolved via
       DNS or local /etc/hosts file, called apt-proxy.  For example, if your network has a local  apt  proxy  at
       9.9.9.9, then add this line to /etc/hosts:

              9.9.9.9    apt-proxy

       If  avahi-browse  is installed, then auto-apt-proxy will try to find any proxies announced via mDNS.  If,
       for some reason, you would prefer the name of the announced proxy to be resolved via NSS rather than  the
       somewhat arbitrary order provided by Avahi, you can set AUTO_APT_PROXY_AVAHI_NAME environment variable to
       any  non-empty  string.   AUTO_APT_PROXY_AVAHI_NAME  does not change which proxy is used if multiple mDNS
       provided proxies are available.

       Copyright (C) 2016-2020 Antonio Terceiro

       This program is free software: you can redistribute it and/or modify  it  under  the  terms  of  the  GNU
       General  Public License as published by the Free Software Foundation, either version 3 of the License, or
       (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;  without  even
       the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
       License for more details.

       You should have received a copy of the GNU General Public License along with this program.  If  not,  see
       http://www.gnu.org/licenses/.

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auto-apt-proxy  is  an  APT  proxy  autodetector,  and  detects common setups by checking localhost, your
       gateway and other “interesting” machines on your network for well-known APT proxies such as apt-cacher-ng
       and others.

       When called with no arguments, auto-apt-proxy simply prints the  address  of  a  detected  proxy  to  the
       standard  output.   This  package installs an APT configuration file that makes APT use auto-apt-proxy to
       detect a proxy on every invocation of APT.

       When called with arguments, they are assumed to be a command.  Such command will  be  executed  with  the
       common  environment  variables  used  for  specifying  HTTP  proxies  (http_proxy, HTTP_PROXY) set to the
       detected proxy.  This way the executed command will be able to transparently use any detected APT  proxy.
       Note  that  for  this  to work, any programs invoked by the given command must have their own support for
       detecting HTTP proxies from those environment variables, and for using them.

       $ auto-apt-proxy

       Just prints the detected APT proxy

       $ auto-apt-proxy debootstrap sid /my/chroot

       Creates a new Debian chroot downloading packages from the local proxy.

       auto-apt-proxy - autodetect common APT proxy setups

auto-apt-proxy will look for possible proxies in the following order:

       • A locally running proxy on 127.0.0.1

       • A locally running proxy on other local addresses

       • A proxy running on the apt-proxy on DNS or local hostname resolution (/etc/hosts).

       • A proxy on the network default gateway

       • A proxy running in the host and port declared in the _apt_proxy_ SRV DNS record

       • A proxy running and announced via mDNS (avahi).

auto-apt-proxyauto-apt-proxy[COMMAND[ARGS...]]