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6

Howto use apt-cacher-ng only when available?

rated 0 times [ 6] [ 0] / answers: 1 / hits: 3717 / 1 Year ago, tue, may 16, 2023, 5:07:48

I'm using apt-cacher-ng at my local network with the following configuration on the clients:

Acquire::http { Proxy "http://acng-host:3142"; };

Some of the clients are laptops, so how do I configure them to use the cache only when it's available on this network?

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ainlyyor

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1 Year ago

answered 1 Year ago avilyexplor · Accepted Answer

Something like this should work:

/etc/NetworkManager/dispatcher.d

#!/bin/bash

ip=10.0.1.13

port=3142

nc -w 1 $ip $port

proxy_file="/etc/apt/apt.conf.d/02local_proxy"

if [ $? -eq 0 ]; then

    echo "Acquire::http { Proxy "http://$ip:$port"; };" > $proxy_file

    echo 'Acquire::https { Proxy "false"; };' >> $proxy_file

else

    rm -f $proxy_file

fi

Fix permissions

sudo chmod +x /etc/NetworkManager/dispatcher.d/99SetAptProxy

Notes:

The "nc" command tests that it can connect to the 3142 port on the given IP address.

This script is run everytime the networking interfaces are changed by network manager.

Feel free to alter the way that you detect for the proxy, this works for me, but it is a security vulnerability if you install packages on a foreign network, for example.